METER OPERATIONS CODE OF PRACTICE AND SAFE WORKING … · 2017-09-05 · Multi Head multi-way distribution board, e.g. Ryfield, Bemco, MEM Neutral the conductor which is connected

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METER OPERATIONS CODE OF PRACTICE AND SAFE WORKING METHODS


METER OPERATIONS CODE OF PRACTICE

AND SAFE WORKING METHODS

Number………………………………………………..

Issued to………………………………………………

Signature……………………………………………...

Date…………………………………………………….

THIS IS A CONTROLLED DOCUMENT It is the property of

Siemens Operational Services

Authors: - Technical Field Services

Issued by: -

Issue Date: -

Issue Medium

Hard copy

Electronic Copy


This signed copy to be held in central records

METER OPERATIONS CODE OF PRACTICE AND SAFE WORKING METHODS

Number………………………………………………..

Issued to………………………………………………

Signature……………………………………………...

Date…………………………………………………….

THIS IS A CONTROLLED DOCUMENT It is the property of

Siemens Operational Services

Authors: - Technical Field Services

Issued by: -

Issue Date: -

Issue Medium

Hard copy

Electronic Copy


Contents: Issue Control Sheets Page 3

Contents Page 5

Definitions Page 10

Section 1

Introduction, Related Policies and Environment

1.1 Siemens Operational Services Policy Page 15

1.2 Copyright Page 15

1.3 Code of Practice Page 15

1.4 The Company Role Page 16

1.5 Competent Person Page 16

1.6 Environment Page 16

Section 2

Health and Safety

2.1 Reporting of Accidents and Incidents Page 19

2.2 Near Miss – Hazards Page 19

2.3 Reporting of Distribution Defects Page 20

2.4 Risk Assessment Page 20

2.5 Prevention of Electric Shock Page 20

2.6 Field Safety Alerts Page 21

2.7 Ladders and Steps Page 21

2.8 Tools and Equipment Page 21

2.9 Testing Devices and Instruments Page 21

2.10 Portable Electric Tools Page 22

2.11 Portable Appliance Testing Page 22

2.12 Personal Protective Equipment Page 22

2.13 Insulated Gloves Page 22

2.14 Safety Helmets Page 23

2.15 Eye Protection Page 23

2.16 Protection Against Excessive Noise Page 23

2.17 Respiratory Protection Page 24

2.18 Footwear Page 24

2.19 High Visibility Clothing Page 24

2.20 Work Wear Page 24

2.21 COSHH (Control of Substances Hazardous to Health) Page 24

2.22 Asbestos Page 25

2.23 Building and Construction Sites Page 25

2.24 Idle Services Page 26

2.25 Labels, Stickers and Cards Page 27


Contents:

Section 3

Basic Electrical Safety Requirements

(Single and Multi Phase)

3.1 Single Phase Page 29

3.2 Multi Phase Page 32

3.3 Sealing of Metering Equipment Page 35

Section 4

Testing

4.1 Visual Inspection and Responsibilities Page 37 4.2 Polarity Testing Page 37 4.3 Proving Dead Page 38 4.4 Working at Outside Meter Positions Page 38 4.5 Insulation Resistance Testing Page 40

4.6 Visual Earthing Check Page 40

4.7 Phase to Earth Loop Impedance Test Page 40 4.8 Phase Sequence Check Page 41 4.9 Fault Diagnosis (Timing Devices and Contactors) Page 41 4.10 De-energisation of Service Page 41 4.11 Disconnection and Removal of all or Part of Metering Equipment Page 42 4.12 Temporary Supplies (Areas of Special Risk) Page 43 4.13 Suspected Interference at the Meter Position Page 43 4.14 Approved Testing Devices for Voltage and Polarity Page 44 4.15 Glow Test for Single and Multi Phase Installations Page 45 4.16 One Fuse Test For Multi Phase New and Existing Installations Page 47

4.17 Phase Rotation Test Page 48

4.18 Testing Phase to Neutral and Phase to Phase across Multi Phase Terminals with Approved Test Lamp Page 49

4.19 Testing sequence at a cut out using an approved test lamp on both TNC-S and TN-S Earthing Systems Page 50 4.20 Testing Isolators Page 51


Contents:

Section 5

Layouts and Making Connections to Metering Equipment

5.1 Terminating Cables Page 53

5.2 Square Clamp Connections Page 54

5.3 Cables Page 55

5.4 Neutrals Direct into Meter Page 56

5.5 Harmonisation of Cable Colours Page 57

5.6 Standard Layouts for Whole Current Metering Page 58

5.7 Layout of Meter Boards Page 58

5.8 Meter Boards Page 58

5.9 Outdoor Meter Cupboards Page 59

5.10 Damaged Meter Boxes Page 59

5.11 Standard Layout for a Single Phase Meter Position Page 60

5.12 Standard Layout for a Multi Phase Meter Position Page 61

5.13 Load Research and Energy Efficiency Equipment (Connected) Page 62

5.14 Fuse Rating Page 62 5.15 Rising Main Installations and Pre-Payment Meters (Debt Collection Devices) Page 63

5.16 Checking Meter Tolerance / Accuracy Page 63

5.17 Connection of Check Meters Page 64

5.18 Connection of Single Phase Check Meters Page 65

5.19 Connection of Multi Phase Check Meter Page 66

5.20 Single Phase Whole Current Sub-Metering Page 67

5.21 Multi Phase Whole Current Sub Metering Page 68

5.22 Multi Way Distribution Boards (Feeding Sub

Mains and Meters in Remote Locations) Page 69

5.23 Intake Rooms Page 70

5.24 Import / Export Metering Principles Page 71

5.25 Half and Full Clarke Cabinets Page 74

5.26 Connection of Earthing Systems to Cut Outs Page 75


Contents:

Section 6 CT Operated Commissioning Procedure

6.1 Compliance Requirement Page 77 6.2 General Commissioning Principles Page 77 6.3 Working Practices Page 77 6.4 Commissioning Procedure Page 78 6.5 Meter(s) Configuration and Operation Page 78 6.6 Load Comparison Test Result Page 79 6.7 Customer Pulsing Consideration Page 79 6.8 Operations Effecting Pulse Outputs or Data Streams Page 79 6.9 Code of Practice Compliance Page 79 6.10 Typical Example of CT Operated Metering (Diagram 1) Page 80

6.11 Typical Example of CT Operated Metering (Diagram 2) Page 81 6.12 Isolating LV Cubicles Page 82 6.13 Presence of Voltage on LV Test Block Page 82

Section 7 Safe Working Methods Whole Current

7.1 General Risk Assessment at the Meter Position Page 85

7.2 General Risk Assessment at the Meter Position and cut out (Before Work Commences) Page 86 7.3 Working on Single and Multi Phase Cut Outs Page 87 7.4 Changing Single Phase Meters Where Access is Gained Page 92 7.5 Changing a Single Phase Meters Where No Access Page 95 7.6 Installation of Single Phase Meters to an Energised Service (New Connection) Page 98 7.7 Changing Multi Phase Meters Where Access to Installation

Is Gained Page 101 7.8 Installation of a Multi Phase Meters to an Energised Service

(New Connection) Page 105

7.9 Changing a Single Phase Meter Where the Cut Out is Remote from the Meter Position Page 108

7.10 Reconnection of Single Phase Meter Page 112 7.11 Reconnection of Multi Phase Meter Page 115 7.12 Changing a Single Phase Meter to an Import / Export Meter

Where Access is Gained Page 119 7.13 Changing a Multi Phase Meter to an Import / Export Meter

Where Access is Gained Page 122 7.14 Installation of Single Phase Whole Current Sub- Meter Page 126 7.15 Installation of Multi Phase Whole Current Sub-Meter Page 130 7.16 Installation of Check Meter Page 134 7.17 Removal of Check Meter Page 139

7.18 De-energisation and Removal of Metering Equipment Page 144 7.19 Gas Escape Procedure Page 148


Contents:

Section 8

Safe Working Methods CT Operated Metering

8.1 Installation and Replacement of GSM Modems Page 151

8.2 LV CT Operated Meter Install or Change to Panel Only Page 152

8.3 Installation of LV CT Chamber/Cabinet and CTs Page 154

8.4 Installation of LV Metering Terminal (T) Box Page 157

8.5 Installation of HV Metering Terminal (T) Box Page 159

8.6 HV VT/CT Operated Meter Install or Change to Panel Only Page 161

8.7 COP 4 Testing OF HV and LV Meters Page 163

8.8 Installation of Half Hourly Sub Meter Page 165

Appendices

Appendix 1 Impact of EU Harmonisation of Cable Colours Page 167

Appendix 2 National Doorstep Protocol Page 169

Appendix 3 Management of Meter Stocks within the Field Page 171

Please note: This document is subject to regular review and therefore the issue status cannot be considered as “latest” when printed.


Definitions

AIRline accident and incident reporting system.

Associated Equipment not the meter e.g. connector block – time switches – contactors – isolators – time switch fuses.

Back Feed when a conductor becomes live after the main point of isolation.

Barrier a part providing a defined degree of protection against direct contact with live equipment.

BEBS S12 (ENA 50-19) Standard Wiring Code Numbers

BNO Business Network Owner

Bunched cables are said to be “bunched” when two or more are connected into the same terminal of the meter or associated equipment.

Cold Calling calling with no prior customer notification or soft call period has expired.

Conductor a cable connected to a meter or associated equipment.

Control Measure something put into place to reduce or eliminate the risk .

Cut Out normally the main point of isolation provided by the Network Owner.

Dead at or about earth potential and disconnected from any LIVE SYSTEM.

Debt Collection Device (DCD) a prepayment meter usually installed/connected remotely from the source of supply and the billing meter.


Diversity allowance of over current for short periods of time that does not affect the safe operation of the installation

DNO Distribution Network Operator

Earth Terminal a terminal located at the incoming service position for connecting the earth continuity conductor.

Earth Conductor Customer’s main earth electrode that is connected either to the PME earth terminal, lead sheath of the main incoming cable or customers earth electrode.

ECO Emergency Connection Order

ESQC Regs Electricity Safety, Quality and Continuity Regulations

Fuse a device designed to rupture when excess current flows exceeding the fuse rating over a period of time.

Gemserv The industry regulatory authority

Hazard something, which has the potential to cause harm, injury or loss.

HH half hourly (normally commercial and industrial)

HHDC Half Hourly Data Collection

HRC High Rupturing Capacity

Idle Service when the incoming cut out/metering installation is in a live state and the installation is vacant.

Insulation suitable non-conducting material enclosing, supporting or surrounding a conductor.

Live electrically charged.

MDT Mobile Data Terminal


Metering Fuses local isolation for CT operated meters

MICC Mineral Insulated Copper Covered cable

MOCOPA Meter Operations Code of Practice Agreement

Multi Head multi-way distribution board, e.g. Ryfield, Bemco, MEM

Neutral the conductor which is connected to the neutral or mid point of the distribution system.

Neutral (borrowed) situation where a neutral conductor has been connected from an adjacent source but not directly from the main neutral point.

NHH non half hourly (normally domestic and light commercial)

HSE Health and Safety Executive

OS Siemens Operational Services (the Company)

PME Protective Multiple Earthing (TN-C-S)

Polarity (Correct) where the live and neutral conductors have been correctly connected.

Polarity (Incorrect) where the live conductor has been connected to a neutral terminal and the neutral conductor has been connected to a live terminal.

Polyphase an installation that is connected to two or three phases and neutral of a 4-wire system or to a single-phase three-wire system.

PSCC Prospective short circuit fault current that will only be limited by the impedance of the cable size/fuse characteristics.

P&SA Pooling and Settlements Agency


PSI Phase Sequence Indicator

Rising Mains service cables with independent over-current and isolation points normally feeding blocks of flats and split at the source of supply. (NB: can be independently owned)

Risk the likelihood of the hazard causing harm, injury or loss.

SNE Separate Neutral Earth (TN-S)

Soft Calling customer has received a letter with prior notification within a specific time period

SSA Settlement Systems Administrator

SSC Standard Settlement Configuration

Supply Cubicle a point of isolation for large supplies

SWA Steel Wire Armoured cable

TMO Technical Meter Operative

TN-C-S PME method of earthing

TN-S Cable sheath method of earthing

TT Customer own earthing system providing an RCD and earth electrode for fault protection

UMetS Utility Metering Service Providers

VIR Vulcanised Indian Rubber


Section 1

Introduction, Related Policies and Environment


1.1 SIEMENS OPERATIONAL POLICY

It is the policy of the Company that any person including contractors/sub contractors undertaking the work or activity shall:

have the appropriate competence, network authorisation and understand any related documents and procedures;

understand the Safe Working Methods within this Code of Practice.

understand the dangers that might arise and the precautions to be taken over the whole period of the work or activity.

This Policy requires that all persons at work:

are adequately trained, assessed, instructed and supervised;

are competent to avoid the dangers that can arise during the work they are carrying out;

observe the relevant legal requirements and other required health and safety precautions at all times.

Individuals are expected to:

work to high standards of integrity and honesty in all activities undertaken on behalf of the Company and in all dealings with other employees, customers, suppliers, competitors and members of the public.

1.2 COPYRIGHT

This document is copyright to Siemens Operational Services. Unauthorised reproduction is prohibited.

1.3 CODE OF PRACTICE

Compliance with this Code of Practice will ensure that the Company is fulfilling its obligations as a Meter Operator in respect of The Registration Authority (Gemserv), as well as meeting the requirements of The Meter Operation Code of Practice Agreement (MOCOPA).

This document is the property of the Company and where hard copies are issued they shall be signed for on receipt. It is the responsibility of the recipient to keep it in good condition and to ensure that it is kept up to date. It must be returned when the recipient leaves the employment of the Company or on completion of work on behalf of the Company.


This Code of Practice is maintained and controlled by Meter Operations and the master version will always be held in the Health and Safety Management System.

1.4 THE COMPANY ROLE

Meter Operator – Providing metering services to energy suppliers, customers and distributors.

1.5 COMPETENT PERSON

Competent Person:

To be deemed competent, you must :

Be trained and assessed in, and successfully complete the relevant skills technical training programme.

Be fully conversant with the nature and extent of the work to be done.

Comply with this Code of Practice when carrying out work, whether instructions are issued verbally or in writing.

Understand and comply with the relevant sections of the OS Electricity Safety Rules.

Use approved safe methods of work, safe means of access and the Personal Protective Equipment and clothing provided for your safety.

Be in possession of the appropriate network authorisation/competency certificate for the area to be worked in

To work in substations another level of authorisation is required and is gained through the appropriate training and assessment applicable to the distribution network area.

1.6 ENVIRONMENT

Siemens Operational Services operate an Environmental Management System, in accordance with ISO 14001:2004 registration. The main impacts on the environment have been established and targets have been set up to ensure that we monitor and improve our performance. It is also very important that we comply with environmental legislation at all times.


Waste

We have a duty of care to ensure that our waste is being managed appropriately and in accordance with the law by:

ensuring that all waste is removed from customer's premises and correctly disposed of

not dropping any litter in public places recycling wherever possible (i.e. using recycling facilities whilst on office sites)

CO² Emissions

The vehicle fleet and travel are our largest contributors to our overall CO² emissions, together with energy use in offices. An attempt to reduce these can be by:

keeping our driving speed at fuel efficient levels conducting regular vehicle checks and ensuring on time servicing of vehicles vehicle sharing for the attendance of meetings, if possible making use of conference call facilities switching off PC's at night and unnecessary lights


Section 2

Health and Safety


Health and Safety at Work etc Act 1974

The Health and Safety at Work etc Act 1974 places a duty upon employers to ensure, so far as is reasonably practicable, the Health Safety and Welfare of employees whilst at work. It also places duties on every employee whilst at work to take care for the health and safety of themselves and other persons who may be affected by their acts or omissions. Every employee is also required to co-operate with their employer, or any person, so far as it is reasonably practicable, to enable that employer or other person, to discharge the duties or requirements imposed by the Act. Therefore all methods and procedures referred to in this Code of Practice must be implemented and are mandatory.

In addition to this, sections 7 and 8 of the Health and Safety at Work etc Act 1974 clearly define the responsibilities of all employees. It shall be the responsibility of every employee while at work to:

Section 7

Take reasonable care for the safety of themselves and of others who may be affected by their acts or omissions at work.

Co-operate with their employer as far as is necessary to enable their employer to comply with statutory legislation.

Section 8

No person shall intentionally or recklessly interfere with or misuse anything provided in the interests of health, safety or welfare at work.

2.1 REPORTING OF ACCIDENTS AND INCIDENTS

All accidents and incidents which occur whilst working for the Company must be reported to AIRline as soon as possible after the event. All accidents/incidents must be recorded and investigated in accordance with the requirements of the Health and Safety Management System.

2.2 NEAR MISS - HAZARDS

Near miss or significant hazards encountered whilst working for the company should be reported to AIRline. Line Managers are responsible for carrying out any necessary investigations in accordance with the requirements of the Health and Safety Management System.


2.3 REPORTING OF DISTRIBUTION DEFECTS

All Distribution defects encountered should be reported to AIRline, for remedial action by the Distribution Network Operator. Defects may include:

Cut out Meter or associated equipment Meter board (including cement based asbestos) Service cable Signs of interference

2.4 RISK ASSESSMENT

Before commencing any metering task the hazards associated with the work must be identified, the associated risk evaluated and the appropriate control measures implemented. Special care must be taken if distracted from the task in hand. Risks must be continually assessed while carrying out the work.

2.5 PREVENTION OF ELECTRIC SHOCK

Work on all live service/meter positions with conductors and/or live terminals shall not be carried out with the exception of testing, Working Live is not permitted , the main cut out fuse MUST always be removed before any work commences. Company approved insulated gloves and eye protection MUST be worn when removing and inserting fuse carriers in all cut outs or whenever there is a possibility of receiving an electric shock through hand contact with electrical circuits. (Refer to section 2.12). All live terminals must be shielded where possible. Additional authorisations through competency training for working live (i.e. 1 – 4 listed below) can be found in the OS Electricity Safety Rules.

All work shall be carried out on equipment and apparatus that has been PROVED DEAD by means of an approved Test Lamp, which the operation of MUST be proved before and after use.

Authorised staff may undertake the following Live working:

1. Checking tightness of Live screw connections during post visit Quality checks where the supply cannot reasonably be turned off.

2. Removal of Neutral and main earth conductors from PME type cut outs with a reverse polarity.

3. Shorting out current transformers on HV/LV metering systems.

4. Calibrating, testing and commissioning via a generator or mains supply.


2.6 FIELD SAFETY ALERTS

When a significant safety hazard is identified in the field, a Field Safety Alert will be issued to all relevant staff and discussed in detail at local Team Talks. The Field Safety Alert may refer to a specific item of equipment e.g. a type of metal clad cut out. The information contained within a Field Safety Alert must be adhered to and may overrule this Code of Practice.

2.7 LADDERS AND STEPS

Only company issued steps and ladders must be used in line with company procedure. All steps and ladders must be visually checked by the Operative before use and must carry a current inspection label and be in date. If steps or ladders are not fit for the task, contact a Line Manager who will advise accordingly.

Ladder work is permitted as long as company procedures are followed and in line with HSE guidance.

2.8 TOOLS AND EQUIPMENT

Only company approved and supplied tools and equipment can be used. All tools and equipment should be thoroughly checked prior to use to ensure that they are in good condition and safe to use. Any tools or equipment that are damaged or otherwise unsafe to use must be withdrawn from service and replaced.

All insulated tools must be stored in clean dry conditions and in such a manner that the risk of damage to the insulation is minimised. Insulated tools must be inspected before use to identify cracks and other visual signs of damage to the insulation, which may affect its insulating properties and therefore its safe use. No employee is to “cut back” the insulation on any tools. It is the responsibility of the Operative to maintain and keep their tools in a serviceable condition.

2.9 TESTING DEVICES AND INSTRUMENTS

Voltage testing devices must be used with due care and attention (including test lamps). Correct operation of each instrument as well as operator safety depends on the insulation being kept in good condition at all times. Fused leads must be used with all


voltage testing equipment and instruments must be within calibration in line with agreed Company procedures.

Before an instrument is applied to any conductor, the operator must ensure that the voltage range of the device is suitable for the particular system to be tested. In the case of a test lamp this must be proved before and after use.

No instrument shall be used that is not “in date” and therefore doesn’t have a current certificate of calibration (test results are invalid). The instrument must be immediately returned to the appointed agent for calibration.

2.10 PORTABLE ELECTRIC TOOLS

All battery operated tools will be supplied by the Company where required and it is the responsibility of the Operative to maintain and report defects to a Line Manager. Under no circumstances must a battery-operated tool be used on any terminals of a cut out.

Faulty or redundant batteries must be disposed of in line with current Company environmental procedures.

2.11 PORTABLE APPLIANCE TESTING

Portable appliances and equipment need to be tested on a regular basis and will be part of a planned inspection and maintenance program. Line Managers are responsible for ensuring that portable equipment is in date. Meter Operatives are responsible for reporting any defective equipment to a Line Manager.

2.12 PERSONAL PROTECTIVE EQUIPMENT (PPE)

Company approved PPE must be worn in all cases where there is a risk of injury or mandatory signs instruct you to wear them. Additional PPE may be required to comply with site specific requirements.

2.13 INSULATED GLOVES

Approved company issued insulated gloves MUST be worn in accordance with the safe working methods within this Code of Practice and DNO specific requirements. Both gloves must be worn to prevent direct and indirect electrical contact when working on all types of domestic and industrial cut outs.


Approved insulated gloves should not be exposed unnecessarily to heat or light or allowed to come into contact with oil, grease, turpentine, white spirit, strong acid or other corrosive substances. When gloves become soiled they should be washed in warm soapy water and left to dry. Periodically the gloves MUST be inflated in order to check for air leakage and to carry out a visual inspection. In the event of any leakage, deterioration or wear, a replacement pair must be obtained and the old gloves returned for disposal. These gloves are for electrical safety only.

2.14 SAFETY HELMETS

Safety helmets MUST be worn when working on construction sites, where mandatory signs enforce it and at all other times when there is a foreseeable risk of head injury. Helmets should be stored in a PPE bag when not in use. It should be inspected before use to check for defects, particularly small cracks. As a minimum requirement, helmets must be replaced after 5 years. (See inside helmet for manufacturing date).

2.15 EYE PROTECTION

Eye protection MUST be worn when working on all domestic and industrial type cut outs or when carrying out tasks that involve a risk of eye injury. Pitted or scratched lenses are dangerous and should be replaced immediately.

The types of eye protection available are:

Glasses, tinted or plain Prescription Safety Glasses Full Face Visor Goggles.

2.16 PROTECTION AGAINST EXCESSIVE NOISE

Where persons are exposed to excessive noise, ear protection MUST be worn. High-risk areas of excessive noise may include:

Generators Cartridge operated tools Motorised winches

Ear protection will be provided by means of ear defenders or disposable earplugs.


2.17 RESPIRATORY PROTECTION

Where protection against dust and fibrous substances pose a threat in the immediate working area a FFP3 facemask MUST be worn at all times. This facemask should also be worn when loosening switch gear lids, and removing porcelain fuse carriers where asbestos cloth may be present and in areas where mandatory signs dictate.

2.18 FOOTWEAR

Safety footwear MUST be worn at all times and is made available by the company in the form of safety shoes/boots or wellington boots.

2.19 HIGH VISIBILITY CLOTHING

High visibility garments MUST be worn in areas of specific risk and where mandatory regulations apply, e.g.

Construction sites

Public Highways

Vehicle breakdowns

Emergency working at night

2.20 WORK WEAR

Approved work wear MUST be worn at all times. Flame retardant overalls MUST be worn when working in substations.

2.21 COSHH (Control of Substances Hazardous to Health)

Examples of substances used by field operatives are:

Bite Back Spray WD 40 Oil Spray Engine Oil Diesel De-Icer

User information for the above substances can be found in the Health & Safety Management System.


Where containers of unknown substance (e.g. chemicals, solvents, weed killer etc.) are encountered and are deemed to be an unacceptable risk in allowing us to carry out the work, then the work shall not proceed until suitable safety advice has been sought.

Where Warning Signs are attached to buildings advising there is a chemical risk inside (e.g. Ammonia present in potato stores etc.) then Operatives MUST NOT enter until suitable on-site safety advice has been obtained.

NOTE: Some substances can seriously affect your skin, eyes and breathing. DO NOT take unnecessary risks.

2.22 ASBESTOS

Where a meter or associated equipment is fixed to cement based meter board (that may contain Asbestos), the meter or associated equipment must not be disturbed or removed. AIRline must be informed so the job can be referred back to the Distribution Network Operator for remedial action.

2.23 BUILDING AND CONSTRUCTION SITES

Before work can commence on a building site, operatives must report to the Site Manager, Agent or Representative. This is a requirement under the Construction, Design and Management Regulations (CDM Regs).

Site mandatory requirements must be complied with including requests to complete an induction programme. The induction programme should normally be backed up with a card being issued that has a unique number printed on it. Future visits to that site or company should then result in a simple signing in and signing out procedure as well as us being informed of any site-specific hazards that may be present.

Operatives must ensure their Safety Passport has been signed and dated at the time of the induction.

When visiting completed properties appropriate PPE MUST be worn at all times, as per the site regulations.

Site specific PPE may be required to be worn as per site instructions eg light weight gloves. These would normally be issued by the site agent, while working on their site.


Of particular importance to Site Managers is the need for us to effectively communicate back to them any problems relating to safety that could result in properties not being energised.

Whilst it is acceptable to leave a Defect Card inside the property this must also be verbally communicated to the Site Manager or Agent before leaving site.

Operatives may be asked to produce proof of Competency/Authorisation to other responsible persons, e.g.

Heath and Safety Inspector Safety Representative Site Manager

Operatives shall at all times have access to their:

Code of Practice Competency Certificate Authorisation to work on the Network Permit to Operate (where required) Safety Passport (where required)

Operatives may be requested to provide written Method Statements for the work to be carried out, these can be gained by contacting your Line Manager or a Health and Safety Advisor.

2.24 IDLE SERVICES

Treat all idle services as LIVE.

Idle Service Identified With No Meter

Ensure that the service is in a safe condition and there is no risk of direct contact with live parts and if safe to do so, apply warning labels/caution tape. Inform AIRline if the service needs urgently removing or isolating.

Idle Service Where The Meter Is To Be Removed

Remove the meter as per this Code of Practice and apply warning labels/caution tape. If the service needs to be removed urgently, inform AIRline.


Idle Services in Building or Demolition Sites

Be observant of the environmental conditions, i.e. ground work and demolition activities. If a service is identified, demonstrate caution and visually inspect the condition. Do not touch or move the service, report immediately to AIRline and site representative.

2.25 LABELS, STICKERS AND CARDS

Where it is a contractual, legal obligation or part of this Code of Practice the appropriate warning labels, stickers or cards shall be attached at the meter position or left with the customer.

Only the current versions of these shall be used.


Section 3

Basic Electrical Safety Requirements

(Single and Multi Phase)


3.1 SINGLE PHASE

These requirements must be followed at all times so as to ensure the safety of Staff, Customers and Contractors.

(a) Operatives must have in their possession and use, when appropriate, such safety equipment as is required to complete their assigned tasks.

(b) Operatives must be competent to carry out the designated task. The operative must carry proof of Competence, Authorisation to work on the appropriate network, safety passport and a Permit to Operate where contractual requirements dictate.

(c) Operatives must be in receipt of clear and understandable job instructions.

(d) Operatives with objections to job instructions prior to visiting a site must first communicate the reasons to their Line Manager and if necessary, to a higher authority. The objections must be satisfactorily dealt with before work continues on the part in dispute.

(e) Operatives must not work in substations unless they have had appropriate training for substation work and are in possession of the necessary authorisation and PPE. In special circumstances Network Owner supervision may be required.

(f) Operatives must comply with customers own safety requirements i.e.

Reporting to site manager’s office on building sites. Comply with any induction requirements. Wearing of Personal Protective Equipment

(g) When arriving on site a risk assessment must be carried out before any work commences. If it is deemed not safe to continue with the work on the grounds of safety the customer and AIRline must be informed.

(h) The polarity of the installation must be determined before and after all meter and equipment changes as per this Code of Practice. Every opportunity will be taken to validate the polarity of the customer’s installation on all other visits. If at any point the polarity is found to be incorrect a Line Manager must be contacted immediately.

(i) Before commencement of any work, the customer, where practical, should be

advised that the supply is to be interrupted and be invited to power down equipment.


(j) Where possible the main isolator should be switched off and a visual check made on the meter to verify no consumption before the fuse carriers are withdrawn from the incoming cut out.

(k) All meters and associated equipment must be considered live until proved to be dead. Proof will be obtained by correct use of an approved testing device in accordance with the safe working methods (refer to sections 7 and 8 of this Code of Practice).

(l) Before working on the metering equipment complete isolation must be made from

the distribution supply network. The only exception to this is the carrying out of approved testing procedures

(m) All customers wiring must be treated as live until proven dead. Extra precautions must be taken under the following situations:

Back feeds on new connections from adjoining properties (extension leads/generators).

Auto stand by generators without change over switches.

Other means of generating electricity onto the network, e.g. solar panels, wind generators

(n) All cables must be polarity marked using an approved identification techniques as per Appendix 1 of this document and the safe working methods contained in this Code of Practice.

(o) LIVE WORKING IS NOT PERMITTED , refer to section 2.5.

(p) If a gas meter or gas pipes are in the vicinity of the electric meter or associated equipment the operative must be aware of the position and operation of the customers main gas control valve in case of emergency. The Gas Regulations BS:6400 state that the gas meter must not be within 150mm of the electricity meter and customers switch gear. Gas pipe work must not be within 25mm of the distribution service cable or cut out, any concerns must be reported through Airline for follow up.

(q) When working on cut outs all exposed live terminals must be shrouded sufficiently to prevent direct contact. Shrouding material must be used to prevent indirect contact with metallic parts of cut outs and exposed pipe work.

(r) Metering equipment under test or adjustment with exposed live parts must be under the immediate control of the operative. Under no circumstances must the meter


position be left unattended where there is a risk of direct or indirect contact with live parts.

(s) During some electrical work an operative will need to be accompanied by another employee. The Operative’s Line Manager will advise on the level of accompaniment.

(t) Any accident or dangerous occurrence must be reported to AIRline as soon as possible after the incident i.e.

Electric shock Flash over Crossed polarity Near misses

Whether causing injury or not, must be reported to AIRline as soon as possible after the event. All accidents must be recorded.

(u) On completion of the work the site must be left tidy and the waste material removed

for correct disposal.

(v) When working on multi metering installations, back feeds and crossed neutrals must be considered. Where a back feed or crossed neutral is identified advice from a Line Manager must be sought before any further work commences.


3.2 MULTI PHASE

These requirements must be followed at all times so as to ensure the safety of Staff, Customers and Contractors.

(a) Operatives must have in their possession and use, when appropriate, such safety equipment as is required to complete their assigned tasks.

(b) Operatives must be competent to carry out the designated task. The operative must carry proof of Competence, Authorisation to work on the appropriate network, safety passport and a Permit to Operate where contractual requirements dictate.

(c) Operatives must be in receipt of clear and understandable job instructions.

(d) Operatives with objections to job instructions prior to visiting a site must first communicate the reasons to a Line Manager and if necessary, to a higher authority. The objections must be satisfactorily dealt with before work continues on the part in dispute.

(e) Operatives must not work in substations unless they have had appropriate training for substation work and are in possession of the necessary authorisation and PPE. In special circumstances Network Owner supervision may be required.

(f) Operatives must comply with customers own safety requirements i.e.

Reporting to site manager’s office on building sites. Comply with any induction requirements. Wearing of Personal Protective Equipment

(g) When arriving on site a full risk assessment must be carried out before any work commences. If it is deemed not safe to continue with the work on the grounds of safety the customer and Airline must be informed.

(h) The polarity of the installation must be determined before and after all meter and equipment changes as per this Code of Practice. Every opportunity will be taken to validate the polarity of the customer’s installation on all other visits. If at any point the polarity is found to be incorrect a Line Manager must be contacted immediately. Before commencement of any work, the customer where practical, should be advised that the supply is to be interrupted and be invited to power down equipment and machinery.


(i) All cables must be polarity marked using an approved identification technique as per Appendix 1 of this document and the safe working methods contained in this Code of Practice.

(j) A phase rotation test must be carried out before any connections are disturbed at the meter position. Whether standard or non-standard the customers phase rotation must remain the same on completion of the job. Where practicable get confirmation of correct operation of three phase machinery from a site representative before and after completion of the job.

(k) Multi phase meters MUST NOT be changed without turning off the customer’s main isolator.

(l) The main isolator must be switched off and a visual check made on the meter to verify that no energy is being recorded before the fuse carriers are withdrawn from the incoming cut out. For any work on associated equipment satisfactory isolation must be afforded by the removal of the incoming cut out fuses. The only exception to this is the carrying out of approved testing procedures.

(m) All meters and associated equipment must be considered live until proved to be dead. Proof will be obtained by correct use of an approved testing device in accordance with the safe working methods (refer to sections 7 and 8 of this code of practice) .

(n) Before working on the metering equipment complete isolation must be made from the distribution supply network. The only exception to this is the carrying out of approved testing procedures.

(o) All customers wiring must be treated as live until proven dead. Extra precautions must be taken under the following situations:

Back feeds on new connections from adjoining properties (extension leads/generators).

Auto stand by generators without change over switches.

Other means of generating electricity onto the network, e.g. solar panels, wind generators.

(p) LIVE WORKING IS NOT PERMITTED, refer to section 2.5.

(q) If a gas meter or gas pipes are in the vicinity of the electric meter or associated equipment the operative must be aware of the position and operation of the customers gas control valve in case of emergency. The Gas Regulations BS:6400


state that the gas meter must not be within 150mm of the electricity meter and customers switch gear. Gas pipe work must not be within 25mm of the distribution service cable or cut out, any concerns must be reported through Airline for follow up.

(r) Metering equipment under test or adjustment with exposed live parts must be under the immediate control of the operative. Under no circumstances must the meter position be left where there is a risk of direct or indirect contact with electricity.

(s) All multi phase meter installations must be connected with a Standard phase rotation. The rotation will be determined by using an approved Phase Sequence Indicator (PSI). The leading phase must be identified as ‘L1’ and subsequent phases ‘L2’ – ‘L3’.

(t) When working on cut outs all exposed live terminals must be shrouded sufficiently to prevent direct contact. Shrouding material must be used to prevent indirect contact with metallic parts of cut outs and exposed pipe work.

(u) During some electrical work an Operative will need to be accompanied by another employee. The Operative’s Line Manager will advise on the level of accompaniment.

(v) Any accident or dangerous occurrence must be reported to AIRline as soon as

possible after the incident i.e.

Electric shock Flash over Crossed polarity Near misses

Whether causing injury or not, these must be reported to AIRline and the Line Manager as soon as possible after the event. All accidents must be recorded.

(w) On completion of the work the site must be left tidy and the waste material removed for correct disposal.

When working on Multi metering installations, back feeds and crossed neutrals must be considered. Where a back feed or crossed neutral is identified advice must be sought from a Line Manager before any further work commences.

Special care must be taken where three single phase meters are being used to supply multi phase equipment. This must be determined at the start of the job by observing the type of installation, i.e., commercial or industrial and observing if multi phase equipment is connected.


3.3 SEALING OF METERING EQUIPMENT

All metering and ancillary equipment points must be sealed using approved sealing pliers, sealing ferrules and high tensile sealing wire. The indentation created by the sealing pliers must be clear and readable.

It is the Operative’s responsibility to periodically check for adequate sealing die impression and to ensure that the whole of the sealing die is applied to the ferrule seal to leave a full sealing ID.

Items that require sealing include: (all points must be sealed)

Meter terminal covers Timing control devices Terminal covers and inspection covers Cut outs (both lugs to be sealed where possible and safe to do so) Neutral covers 4 amp fuse carriers Single and double pole blocks Contactors Isolators Test blocks Meter panels

When sealing the metering equipment all seals shall be trimmed so that no high tensile wire extends from the sealing ferrule. Care should be taken when trimming sealing wire to ensure that surplus wire does not become ‘airborne’ and in doing so become a hazard.

All waste materials from the sealing operation shall be removed and disposed of in accordance with environmental procedures.

Sealing pliers must be maintained in a serviceable condition by the Operative.


Section 4

Testing


4.1 VISUAL INSPECTION AND RESPONSIBILITIES

Electrical Contractor:

It is the legal responsibility of the electrical contractor who is carrying out the work on the installation to ensure that it conforms to BS 7671.

Siemens Operational Services:

Are legally responsible to carry out a visual inspection of the installation in compliance with the ESQC Regs and any defects must be highlighted to the customer on the appropriate defect card. Where it is deemed that the installation is unsafe the supply could be withheld or disconnected. If in any doubt contact a Technical Manager for advice.

4.2 POLARITY TESTING

Before commencing work at a meter position, polarity will be confirmed at a socket outlet (eg ring main and cooker circuit). On completion of the job, polarity will be confirmed at the same socket as tested at the beginning of the job.

Polarity testing MUST be carried out using the company approved:

Neon Testoscope Plug in test device Volt Stick

The following equipment MUST be tested for correct polarity on the installation, maintenance and operation of:

Cut outs Meters Timeswitches or teleswitches Contactors Isolators (top and bottom) Connector Blocks Test Terminal Blocks


Suitable polarity testing points on the customer’s installation are:

Socket outlets within the premises Consumer unit(s) Isolators Main Switches and Panels

WARNING:

To ensure that work on the metering equipment has not altered the polarity of the customer’s installation; the polarity must be proved at the same points both before and after the work being carried out. If polarity testing is carried out at a cooker socket before work commenced, then it shall be carried out again at the cooker socket when work is completed, and not at any other sockets. If at any time the polarity is found to be incorrect on the installation do not attempt to rectify any wiring, contact a Technical Manager immediately. DO NOT PROCEED WITH THE WORK

4.3 PROVING DEAD

Proving dead shall be undertaken using the approved test lamp. The operation of the test lamp must be proved before and after every test by the use of a proving device or confirmation on a known live supply. It is advisable that the operative always carries a spare test lamp bulb in case of failure.

4.4 WORKING AT OUTSIDE METER POSITIONS

When working at an outside meter position and access to the property is gained, the installation polarity MUST be verified in accordance with this Code of Practice.

Where access to the property cannot be gained the meter exchange should be aborted. The operative will contact scheduling and arrange a further appointment no shorter than 2 weeks in the future. This date will be entered onto a card which will be posted through the door at the property.

On the return visit if access is gained the meter exchange will take place and the installation polarity MUST be verified in accordance with this Code of Practice.

If the customer is still not present on the follow up visit then the load on the meter MUST be measured using test equipment to establish the load does not exceed 5 Amperes. If this is the case and no additional circuitry is in place or changes to wiring need to take place then the meter can be exchanged following this Code of Practice


Under no circumstances must a single phase meter be changed in an outside meter position when cold calling and no access to the installation is available.

The meter and customers cables must be identified with approved markers before any work commences. The polarity at the cut out and meter (incoming and outgoing) must be confirmed that they correspond with the cable markings before the cables are removed from the meter. This ensures that the cables can be reconnected so as not to alter the Polarity State of the installation. A note must be made on the MDT, ECO and witness sticker that the customer was not present at the time of the meter change.

If the tails cannot be marked while still connected to the meter, they MUST be marked individually as they are removed from the terminal.

Consideration MUST be given to the colour of the inner cores of the cable and that they correspond to the markings and the live and neutral terminals of the meter see example below.

Under no circumstances must a multi phase meter be changed in an outside meter position without access to the customer’s main isolation switches.

In situations where meters are mounted on a swing door and are to be changed to a pre-payment meter, accessed from inside the property, a meter board must be fitted at a suitable permanent position. This is to reduce mechanical stress and damage to the insulation of the meter tails when the customer credits the meter.

If any of these scenarios are identified, a revisit to the premises MUST be arranged to confirm polarity of the installation. Inform your Line Manager and AIRline


4.5 INSULATION RESISTANCE TESTING

For normal metering work there is no contractual requirement for OS to test the customer’s wiring. The meter tails are energised up to the main switch or isolator only (switch turned off) and the customer or their electrician is responsible for ensuring that adequate tests have been carried out on the installation in accordance with BS 7671.

Insulation resistance testing shall be undertaken on all properties that have been identified as having a Reverse Polarity as defined under Section 31 of The Electricity Safety, Quality and Continuity Regulations 2002.

Nominated staff within meter operations shall be authorised to carry out insulation resistance testing in accordance with the reverse polarity procedure and test results recorded.

In accordance with 4.15 of this Code of Practice , a glow test must be conducted with a test lamp across the cut out before inserting the fuse carrier. This is to determine if there is a risk of inserting a fuse while a short circuit is in place (e.g. tails trapped inside metal trunking or faulty meter). A full light indicates that there may be a fault and appropriate steps must be taken to determine the cause and the appropriate action taken.

4.6 VISUAL EARTHING CHECK (Where contractual arrangements dictate)

The Operative, so far as is reasonably practicable, must ensure that the PME Equipotential Bonding meets the necessary requirements of The IEE Wiring Regulations BS 7671. A copy of the Earthing Guidance Notes will be issued to operatives engaged on this type of work.

4.7 PHASE TO EARTH LOOP INPEDANCE TEST (Where contractual arrangements dictate)

The phase to earth loop impedance MUST always be tested at the service cut out, and not a socket outlet inside the property. The test at the service cut out should be carried out with all outgoing cables removed. Where maximum values are exceeded as per contractual requirements, AIRline must be informed. The work must only be carried out on instruction from the Network Owner. It is not permissible to connect any installation where there is no effective means of earthing. If in doubt seek advice from a Line Manager.


4.8 PHASE SEQUENCE CHECK

Phase sequence must be determined by using an approved PSI.

The meter must be connected with a standard phase sequence with the leading phase being labelled “L1” for all installations.

The phase sequence on the customer’s existing installation must remain unchanged on completion of the work. IF IN DOUBT SEEK ADVICE FROM A TECHNICAL MANAGER

4.9 FAULT DIAGNOSIS (timing devices and contactors)

Before any seals are removed or physical work commences the operative should find out as much information as possible from the customer. Check that the switching times are as the SSC code and the time of day is correct. In all cases involving a timing device where the time can be physically altered, the time should be set to represent off peak hours and confirm correct operation of the meter or contactor.

Where it is necessary to test the switching operation of auxiliary equipment the operative must use an approved test lamp to bridge out the auxiliary terminals.

Under no circumstances must terminals be bridged using a piece of wire or other conductive material.

All outcomes should be entered into remarks section on the MDT or ECO.

4.10 DE-ENERGISATION OF SERVICE

Where meters are to be disconnected and removed, attach the current “DANGER – TREAT AS LIVE” safety label/tape to the cut out.

Where it is evident that a live service needs to be urgently removed, inform AIRline.

In the event that the supply to a property is via a solid link cut out, (e.g. rising mains in a block of flats) and access to the Supply Fuse is restricted, then all tests and isolation shall be carried out at the solid link cut out. Cables shall be physically removed from the solid link cut out, and open terminals shall be blanked off to restrict direct contact.


NOTE: The solid link barrel shall not be removed from the red head carrier, replace carrier, fit high security seals and apply “DANGER – TREAT AS LIVE” label/tape.

Before any meters or associated equipment are removed from the idle service, care must be taken that no back feed exists, and tests must be carried out using an approved voltage tester.

4.11 DISCONNECTIONS AND REMOVAL OF ALL OR PART OF METERING EQUIPMENT

Where Neutral tails are wired in a “not to current standard” manner (as per example photo page 43) and cannot be visually traced, then electrical checks using an approved test lamp shall be carried out on the consumer unit main switch to ensure the correct neutral tail has been left connected. The test lamp shall be proved before and after use.

The test lamp check shall be carried out on the incoming side of the main switch with the main switch in the OFF position. This will involve carefully removing the cover off the consumer unit.

Where neutral tails can be visually traced for 100% of their length there is no need to carry out the test lamp check.

It is the operative’s responsibility to ensure the correct neutral tail has been removed and that the customer’s installation is left in a safe state.

The operative must contact a TMO, or other technical person, where there are any concerns or doubts relating to disconnecting the correct neutral tail.

Neutrals must NOT be connected as per the photo over page. Outgoing neutrals must both be connected into a connector block with just one neutral connected to the meter.


4.12 TEMPORARY SUPPLIES (AREAS OF SPECIAL RISK)

As a Meter Operator we are not responsible for the design of the installation. However in areas of special risk e.g. temporary supplies, caravans, boats, swimming pools, and building sites we have an obligation to ensure that connection to the Distribution Network does not represent a danger to the customer or the public. In such instances earth electrodes and Residual Current Devices (normally 30mA) would be expected. Reference must be made to the Earthing Guidance Notes. If there is any doubt please seek advice from a Line Manager or Safety Advisor.

4.13 SUSPECTED INTERFERENCE AT THE METER POSITION

Great care must be taken by the Operative when attending a job where tampering is suspected. An initial visual risk assessment must be carried out. If interference is suspected or found, contact AIRline immediately. They will inform the relevant Revenue Protection appointed agent.

Under no circumstances must the meter be physically touched without the removal of the incoming cut out fuse.

Not acceptable


4.14 APPROVED TESTING DEVICES FOR VOLTAGE AND POLARITY

MARTINDALE

Proving Polarity on customer’s sockets

VOLT STICK

Voltage and Polarity Indication

NEON TESTOSCOPE

Hard Connection for Proving Polarity

TEST LAMP

For Proving Dead


4.15 GLOW TEST FOR SINGLE AND MULTI PHASE INSTALLATIONS

The glow test must be carried out on all meters prior to energisation, for both new and existing installations the reason for the tests is to highlight faults that may exist on meters, associated equipment and customer’s tails.

The test procedure is as follows:

Check operation of the test lamp by the use of a proving device or known live supply.

Insert one probe of the test lamp in the dead side of the cut out.

Insert the other probe of the test lamp into the live side of the cut out.

Observe the test lamp results, see following diagrams.

EXISTING INSTALLATION – ACCESS GAINED SINGLE AND MULTI PHASE

Ensure that ALL Main Switches are in the OFF position, where reasonably practicable.

EXISTING INSTALLATION – NO ACCESS SINGLE PHASE ONLY OR REMOTE METER POSITIONS:

When working at an outside meter position or remote meter position and access to the customer’s main switch cannot be gained, the customer’s tails must be removed from the meter before the test is carried out.

NEW INSTALLATION – TEST AND CONNECT SINGLE AND MULTI PHASE:

Ensure that the new meter tails are connected into the meter and the customer’s main switch is in the off position.

NEW INSTALLATION – INSTALLING AN ISOLATOR SINGLE PHASE ONLY:

Ensure that the new meter tails are connected into the isolator and the isolator is in the on position before the test is carried out.


Normal Operation (Meter Glow)

This picture indicates the Test Lamp showing Meter Glow. This indicates normal operation and no fault exists.

Note: Electronic meters with LCD displays

On certain electronic meters the test lamp WILL NOT indicate meter glow BUT the meter LED display will show. This will indicate normal operation and no fault.

Full Light (Fault Indicated)

Meter Display illuminated.

Note NO Glow visible on Test Lamp.

The example shown is a multi phase meter but the results are the same on some single phase credit and prepayment meters.

The glow test must be carried on ALL phases of a multi phase meter

Full light (as shown) indicates that there is a possible fault on the installation between the

cut out and the customer’s main switch. DO NOT insert the Main Cut out fuse. Check that the Main Switch is in the OFF position. Carry out a full visual inspection of tails, Isolator

and/or Main Switch. Disconnect customers outgoing tails and retest Identify the fault if possible Isolate fault if possible. Contact your Line Manager for further guidance.


4.16 ONE FUSE TEST FOR MULTI PHASE NEW AND EXISTING INSTALLATIONS

It is important that you establish you are not inserting a cut out fuse onto a phase to phase fault that could be present for e.g. at the meter, isolator or customer’s main switch.

This procedure is as follows:

The One Fuse Test (conducted after glow test)

Carry out Polarity tests at the cut out. Establish the Phase rotation at the cut out and visually check phase markers

correspond to phases. Ensure that ALL customers’ main switches are turned off.

Insert fuse in cut out “L1” only. Check with your Voltstick that both terminals

labelled “L1” indicate a voltage. Check all other live and neutral load terminals,

there should be NO LIGHT on the Voltstick. If at anytime during the test procedure the

Voltstick shows voltage on any other terminal then abort the test immediately.

Rectify Fault (if possible) or seek technical assistance.

Check “L1” terminal on Isolator / Main Switch,

(Polarity Test).

Remove Fuse from Cut out “L1” and Insert in cut out “L2”.

Carry out procedure as for “L1”.

Remove Fuse from Cut out “L2” and Insert in cut out “L3”.

Carry out procedure as for “L2”.


4.17 PHASE ROTATION TEST

Photo shows mechanical drum type PSI. When correct phase rotation is identified the arrow will spin anti-clockwise.

Photo shows electronic type PSI. When correct phase rotation is identified the correct LED’s will light up.

Photo shows phase rotation being identified at a large power cut out. The PSI has been fitted with “crocodile clips” on two leads to assist with the connections.


4.18 TESTING PHASE TO NEUTRAL AND PHASE TO PHASE ACROSS MULTI PHASE METER TERMINALS WITH APPROVED TEST LAMP

L1 Phase to Neutral = 230 volts

Normal brightness on test lamp





L1 Phase to L2 Phase = 400 volts

Bright light on test lamp





1

2

3

4

5

6


4.19 TESTING SEQUENCE AT A CUT OUT USING AN APPROVED TEST LAMP ON BOTH TNC-S AND TN-S EARTHING SYSTEMS

Live

Neutral -

Earth

Live

Neutral Earth

Neutral to Live =

Earth to Live =

Earth to Neutral =

Neutral to Live =

Neutral to Live =

TN-C-S

(PME)

TN-S

(SNE)


4.20 TESTING ISOLATORS

When an isolator has been fitted at a meter position, polarity must be confirmed at both incoming and outgoing sides of the isolator using an approved testing device.

Supply must be confirmed at both incoming and outgoing sides of the isolator. This must be competed using an approved test lamp with the Isolator in the “ON” position. On completion of the job the Isolator must be left in the “OFF” position and the appropriate disclaimer label attached.

Confirming polarity at an isolator with an approved

testing device

Confirming supply at an isolator with an approved test

lamp


Section 5

Layouts and Making Connections to Metering Equipment


5.1 TERMINATING CABLES

All conductor terminations shall be mechanically and electrically sound. Every connection at a cable termination shall securely contain and anchor all the wires of stranded conductors, and not impose an appreciable mechanical strain on the terminal. At every cable termination, the insulation shall be removed no further than is necessary so that illegal connections are prevented.

The trimming of cable cores to reduce the cross sectional area of the cable is strictly prohibited on all tails. Specific meters with large terminals shall be installed or an approved method of cable size reduction adopted.

In the case of single core PVC insulated and sheathed cables, the PVC insulation should first be cut back to expose a slightly longer length of conductor that is required to fully enter the terminal. The PVC sheath should be cut back to expose between 3mm and 5 mm of the PVC insulation to give a stepped effect.

All cable sizes 16mm and below must be twisted using pliers to ensure maximum mechanical and electrical connection, except on square/clamp terminal

connections. (see 5.2)

Trim conductor to length to ensure that the PVC insulation of the cable butts up to but does not enter the meter terminal block. The PVC sheath should just enter the tapered orifice in the moulded insulation. Ensure that the conductor is fully inserted into the terminal. Tighten the terminal screws nearest to the cable entry. Then tighten the terminal screw furthest to the cable entry, ensuring that it grips the cable conductor. Then give a final tightening to both terminal screws.

Only one conductor shall be connected to each terminal of meters, cut outs, time switches, isolators and associated equipment. Where more than one conductor is to be connected, a connector block shall be fitted.

After all connections have been made a final check on the tightness of all terminal screws MUST be carried out manually, not with a battery operated tool.

NB: When stripping the inner insulation from the cable, care must be taken not to damage the copper cores, where damage has occurred then the cable must be re-terminated or replaced.

Stepped 3mm to 5mm


5.2 SQUARE CLAMP CONNECTIONS

Certain meter types and metering equipment have a square, clamp type terminal for connecting meter tails.

Care must be taken to ensure the cable sits inside the square clamp and not behind, as this would cause the cable to overheat and potentially cause a fire. Mechanical security of the termination must be confirmed with a physical tug on the cable.

To ensure a good mechanical connection tails can be flattened to fit into the square clamp to ensure a tight fit within the terminal. The cable should be pulled and re tightened at least twice to verify the connection.

Care must be taken not to clamp the cable insulation with the bottom screw.

Clamp type connections on a heating contactor. Connection must be fully open to ensure cable sits inside and not behind the clamp.


5.3 CABLES

The cables between the cut out and all metering equipment shall, where practicable, be PVC, double insulated stranded copper conductors. The cable size for connection between the cut out and the meter shall be 25mm where the cut out is fused at 100 amps. Where 16mm tails are installed fuses should be installed with a rating of 60/80 amps.

Cut out to meter cables must be upgraded where reasonably practicable if they are not suitable for use e.g. Refer to 5.14

Undersized Non PVC Stressed, damaged or not fit for purpose

At existing meter positions or installations where single insulated cables are feeding the meter and run through trunking or conduit, the existing cables can be adopted if the cables are deemed to be in a good sound mechanical and electrical condition. In this scenario the meter MUST be fitted, as close as possible to the trunking to maintain mechanical protection. Where this cannot be achieved sleeving must be added to the single insulated cables to maintain double insulated standards. Contact a Technical Manager if in any doubt.

Auxiliary wiring used in the connection of time controllers and contactors will normally consist of 10mm up to the 4amp fuse where applicable, and 2.5mm between the 4amp fuse and control apparatus where applicable.

Polarity of cables must be clearly identified with approved markers irrespective of the outer sheath colour e.g.

For single phase Live = L For multi phase = L1, L2 and L3 For all Neutrals = N

The bunching of cables at the cut out or at the meter terminals is NOT permitted. Approved connector blocks must be used to segregate previously bunched cables.

In the event of the customer’s meter tails being defective (i.e. single insulated, inadequate size or insulation) an isolator will be fitted using 25mm tails from the meter to the isolator and the customers’ tails connected to the outgoing side. The appropriate defect form/card should be left with the customer.

If the customer’s tails are considered unsafe, advice should be sought from a Technical Manager before the work commences.


5.4 NEUTRALS DIRECT INTO METER

Where the Distribution neutral has been connected directly into a meter and the meter is to be changed, after completing a Risk Assessment as per this Code of Practice the neutral will be reconnected as found. On completion of the job, AIRline must be informed. AIRline will contact the DNO to complete remedial work.

Where PME has been requested, a neutral block will be fitted and PME connected as per Earthing Guidance Notes.

L L N N

L L N N

PME


5.5 HARMONISATION OF CABLE COLOURS

Great care must be taken where new and old colours exist on the same installation. In these cases a yellow Caution sticker must be stuck in a prominent position at the meter position.

Red

Yellow

Blue

Neutral

Brown

Blue

Grey

Black

Old Colours New Harmonised Colours

L1

L2

L3

N

L1 Load

L2 Load

L3 Load

Multi Phase Load


5.6 STANDARD LAYOUTS FOR WHOLE CURRENT METERING

General

This Code of Practice recommends standard layouts to cover all normal arrangements for whole current metering installations, to include domestic, commercial and light industrial tariffs.

5.7 LAYOUT OF METER BOARDS

Standard layouts shown for the position of the cut out, meters, time controller, connector blocks and contactors shall be followed as closely as practicable, examples of these can be found in the respective wiring diagrams.

Wherever possible the equipment on the meter board shall be positioned so that a clear space of 25mm is left around the edge of the board.

5.8 METER BOARDS

All metering and associated equipment shall be installed on an approved meter board as recommended by the DNO.

Where reasonably practicable an access space of at least 1200mm should be available in front of the meter board. The bottom edge of a meter board should not be less than 400mm above the finished floor level.

Where an existing meter board is not large enough to take additional metering equipment, then another meter board shall be fitted alongside.

Where a meter is installed on a non standard meter board or cabinet, i.e. metal plate or on brickwork, every effort should be made to install a standard meter board. Where this cannot be achieved fit meter as existing.

Meter board fixing screws must be secure. Where this is not the case operatives must endeavour to retighten/replace the screw into the original fixing hole. If this is not possible AIRline must be informed.

It is NOT permitted to change any meter board containing a live service cut out .

Where a pre-payment meter is to be fitted to an existing installation and the service position is of unreasonable height or the customer is physically disadvantaged to safely


access the meter, a second meter board will be installed in a lower position and the pre-payment meter fitted to it. If this is not possible on the original visit, the job must be aborted and rebooked allowing extra time for the additional work to be completed.

All wiring required to lower the meter will be left neat and tidy and where necessary mechanically protected in plastic trunking.

5.9 OUTDOOR METER CUPBOARDS

Wherever practical the standard layout shall be used for outdoor meter cupboards.

5.10 DAMAGED METER BOXES

The Operative will endeavour to repair the damaged meter box or door at the time of the visit to protect the metering equipment. Where this is not possible a temporary repair should be made and the appropriate “Damaged Meter Box” warning label attached.

All damaged meter boxes and doors must be reported to AIRline.


5.11 STANDARD LAYOUT FOR SINGLE PHASE METER POSITION

SERIES 7

HE

NL

EY

MA

DE

IN

U

K

100A S

ER

IES

7

• All cables shall be single core, PVC, double insulated.

• 25mm tails to be fitted when 100 amp service fuse has been installed.

• Minimum 25mm gap to be left around edge of meter board.

• Both incoming and outgoing live and neutral tails must be clearly identified with the appropriate cable markers.

• Earth wires omitted for clarity.

L L N N


5.12 STANDARD LAYOUT FOR MULTI PHASE METER POSITION

• All cables shall be single core, PVC, double insulated.

• 25mm tails to be fitted when 100 amp service fuse has been installed.

• All phase cables shall be marked L1,L2,L3 and N respectively.

• Phase rotation shall be left standard across the meter terminals.

• Minimum 25mm gap to be left around edge of meter board.

• Earth wires omitted for clarity.

SERIES 7

HE

NLE

YM

AD

E I

N U

K

100A S

ER

IES

7

100A S

ER

IES

7

100A

100A

100A

SE

RIE

S 7

SE

RIE

S 7

SE

RIE

S 7

HE

NLE

Y

HE

NLE

Y

MA

DE

IN U

K

MA

DE

IN U

K

L1

L1

L2

L2

L3

L3

N

N


5.13 LOAD RESEARCH AND ENERGY EFFICIENCY EQUIPMENT

Where load research/energy efficiency equipment is being installed and connected, under no circumstances must a flex (normally supplied with this type of equipment) be connected directly into the cut out, meter or test blocks. Connection must be through a suitably rated fuse that provides adequate short circuit and over current protection.

5.14 FUSE RATING

All cut out fuses shall not exceed the current carrying capacity of the meter that is to be changed/installed, however there will be circumstances where the loading of the meter, sizing of the tails and current carrying capacity of the fuse DOES NOT match due to diversity of the customers installation. In cases where fuse sizes cannot be altered due to non standard fuse types not being available, then the customer, AIRline and the relative Network Owner shall be informed. If any doubt arises seek clarification from a Technical Manager.

Refer to Fuse Sizing table below.

FUSE SIZING TABLE

Cut Out Fuse Size Cut Out to Meter

Tails

Customer Tails

Comments with ref to tails and meter

60 AMP 60 AMP 16mm 16mm or below

OK

60 AMP 60 AMP 16mm

25mm Upgrade tails where practicable

60 AMP 60 AMP 25mm 16mm or below

OK

100AMP 60AMP 16mm 25mm Upgrade cut out to meter tails to 25mm where reasonably practicable

100 AMP 100AMP 25mm 16mm Install isolator using 25mm from meter and connect customers’ 16mm tails into isolator. Leave safety notice with customer

100 AMP 100 AMP 25mm 25mm OK 100 AMP 100 AMP 16mm 25mm Upgrade cut out to meter tails to 25mm ABOVE 100 AMP

160AMP and above

25mm or 35mm

25mm or 35mm

Determine why 160A fuses have been installed? If this cannot be determined contact technical support for advice before changing the meter.

ABOVE 100 AMP

160AMP and above

50mm and above

50mm and above

Determine why 160A or above fuses have been installed? If this cannot be determined contact technical support for advice before changing the meter.

Cut out Fuse Rating 60 A 80 A 100 A

Max ELZ Value (Ohms) (UKPN DNO)) 0.35 0.35 0.35

NO Fuse should be downgraded


All cables should be double insulated. Where the customers cables are single insulated, sleeving must be added to maintain double insulated standards. Contact a Line Manager if in any doubt.

5.15 RISING MAIN INSTALLATIONS AND PRE-PAYMENT METERS (DEBT COLLECTION DEVICES)

The standard layout of meter boards shall be used in situations where pre-payment meters are being used as debt collection devices. The carrier in the cut out adjacent to the meter shall be fitted with a solid link in place of the fuse. For identification purposes carriers fitted with solid links shall be coloured red . Where a solid link is found, under no circumstances should a HRC fuse be used to replace the link. Where HRC fuses are found under no circumstances must a solid link be fitted.

On de-energisation of this type of installation then all out going tails must be removed from the red link cut out, terminals must be blanked off and the installation sealed. The idle service must now be labelled with the appropriate “Live Installation” warning label or tape.

Care must be taken when working on an installation where the cut out is remote from the meter position, this situation can be common with rising mains. Refer to Safe Working Method, 7.9.

5.16 CHECKING METER TOLERANCE /ACCURACY

The legal tolerance of a meter must be between 2.5% fast and 3.5% slow. If the test results fall within these tolerances then a meter is deemed accurate.

All equipment used for determining tolerance will be calibrated/dated and have a visible recalibration date attached.

Meter tolerance / accuracy will be completed by one of the following methods:

Using a stop watch, clamp meter and calibrated fixed load (electric fan heater)

Fitting a check meter

Using a meter accuracy load testing device

The preferred method for testing meter tolerance is using a stop watch, clamp meter and calibrated fixed load (electric fan heater). Where this method is used the test results will


be input into a “load calculator” on the MDT which will determine if the meter is in or out of tolerance.

The test will be completed three times and an average of the three test results will be taken.

The test results must be recorded as per contractual requirements eg

Results on MDT Verbal communication Test result form

5.17 CONNECTION OF CHECK METERS

The method of connecting check meters is shown in the following diagrams. The diagrams are for reference only and cover the principle of connection for single and multi phase meter tariffs.

Where there is limited space for the installation of the check meter, a small meter board should be installed, and all meters must be securely fixed.

The phase rotation of any multi phase check meter shall be standard rotation, regardless to the billing meter that may be incorrect phase rotation.

Refer to 5.18 single phase 5.19 multi phase


5.18 CONNECTION OF SINGLE PHASE CHECK METERS

Check Meter Disputed Meter

All new meter tails to be 25mm double insulated.

Where reasonably practicable the seal on the disputed meter should be left intact.

Meter tails to be removed from the cut out and terminated into the load side of the new check meter.

SERIES 7

HE

NL

EY

MA

DE

IN

UK 100A

SE

RIE

S 7

L L L L N N N N


5.19 CONNECTION OF MULTI PHASE CHECK METERS

SERIES HENL

MADE IN

HE

NLE

Y

Check Meter Disputed Meter

1 2 3 4 5 6

100 10 1

CE

kWh

TYPE E43B3B-

ABB

3PH 4W CI . 2

30 rev / kWh

A 3 x 40 -

V 3 x 230 /

K05FAO265

EAST MIDLANDS

100A

100A

100A

SE

RIE

S 7

SE

RIE

S 7

SE

RIE

S 7

HE

NLE

Y

HE

NLE

Y

L1

L2

L2

L3

L3

L1

L2 L1

L1 L2

L3

L3 N

N

N

N

All new meter tails to be 25mm Where reasonably practicable the seal on the disputed meter should be left intact.

Meter tails to be removed from the cut out and terminated into the load side of the new check meter.


5.20 SINGLE PHASE WHOLE CURRENT SUB METERING

N L

ON

OFF

Incoming Sub Main removed from Switch Fuse and glanded into

insulated enclosure Earth wire to ensure Earth Continuity

Sub Meter

Customer’s consumer unit

Enclosure with red links and neutral block

mounted on approved meter board


5.21 MULTI PHASE WHOLE CURRENT SUB METERING

Customers Switch Fuse

Sub Meter

Enclosure with red links and neutral block

mounted on approved meter board

Incoming Sub Main removed from Switch Fuse and glanded into

Enclosure

Earth wire to ensure Earth Continuity


All Sub Metering work will be carried out to this Code of Practice (section 7.14) (section 7.15). A full risk assessment will be carried out in accordance with the safe working methods (7.1 to 7.3) in this Code of Practice and the Operative must have a full understanding of the task before any work can take place. If at any time the Operative is unsure technical advice must be sought.

A Sub Metering Electrical Isolation Pro-forma must be completed in conjunction with a responsible representative on site (Site contact) and any permits to work must be obtained, (where applicable).

5.22 Multi Way Distribution Boards (feeding sub mains and meters in remote locations)

When working on multi way distribution boards, the items listed below MUST be considered (e.g. Ryfield/Reyrole/MEM).

Metal clad construction Missing phase and fuse barriers giving risk of direct contact with live terminals Identification of final sub circuits (flat numbers missing or incorrect) Using fuse finders Access to fuse terminals to carry out glow test and ELZ verification Cable types Cable terminations Lock off procedure Sealing of the installation Reporting of hazards and associated risks

For details, refer to table over page.


Rising Mains with No Means of Local Isolation (Non Standard Cables) Table

Cable Types Action – Incoming Tails Action – Customer Tails

PYRO (MICC)

VIR

SWA

Single Insulated PVC

Ensure that all cables are de-energised as per this Code of Practice.

No oversleeving to take place whilst the cables are energised.

Identify the tails before removing from meter. Oversleeve with brown and blue sleeving and apply appropriate markers as per this COP.

Check that main fuse at remote supply position is correct rating (e.g 60 amps) and matched to the cables connected into the meter.

If tails are electrically and mechanically sound, mark the tails and connect into the meter.

If tails in poor condition and prove to be an electrical hazard, re-terminate cable to a point of safe condition, oversleeve if necessary and terminate into an isolator.

Leave defect card and record isolator fitted on MDT.

Cables in Trunking Where single insulated tails are

exposed, mark the tails and apply oversleeving to exposed length.

Where single insulated tails are exposed, mark the tails and apply oversleeving to exposed length.

5.23 INTAKE ROOMS

Meter operatives must undertake a thorough risk assessment before deciding if a pre-payment meter can be safely installed inside an intake room.

Typical hazards or issues that may be present include the following:

Intake room door damaged Intake room door cannot be locked Covers missing off switchgear Terminal covers missing off meters Covers missing off connector blocks Exposed Live terminals or conductors Perished VIR tails Trunking lid hanging off Signs of vandalism Signs of drug misuse (needles on floor) Risk of rain getting in


Any other serious cause for concern

Notices displayed inside intake rooms saying that pre-payment meters cannot be installed may not be official and may need to be clarified by a Safety Adviser.

OS policy is to continue to install pre-payment meters inside intake rooms provided, as a result of the risk assessment, it is deemed safe to do so. The Health and Safety Executive have been consulted over this issue. Where you are unsure, always seek advice.

Housing Associations and Landlords have a legal duty to ensure intake rooms are safe and secure.

Should the risk assessment determine it is unsafe to install the pre-payment meter; the job must be aborted and reported to AIRline.

Where jobs are risk failed please endeavour to capture the contact details for the site.

5.24 IMPORT / EXPORT METERING PRINCIPLES

Import/export metering is installed on a site that has the capability of producing surplus energy above its own requirements. This surplus energy can be measured by use of an import/export meter or separate export meter.

Before any work is carried out on import/export metering, isolation from the customer’s installation must be confirmed, to ensure there is no back feed generated from the customer’s equipment.

If the installation cannot be isolated or the customer is not present, the job must be aborted.

All work carried out on import/export metering must be completed in line with this Code of Practice, (safe working methods 7.1/7.3)

The following drawings show two separate meters, installed as Import and Export meters, as illustration only.


Import Meter Export Meter

Domestic Generated

Solar Panels

Schematic Drawing to Show Single Phase Import / Export Metering


Schematic Drawing to Show Multi Phase Import / Export Metering

ON

OFF

ON

OFF

Generated Domestic

Solar Panels

Import Meter Export Meter


5.25 HALF AND FULL CLARKE CABINETS

Great care must be taken when working on Half Clarke or Full Clarke cabinets because of the following hazards that may be present :

Risk of foreign debris, eg such as metal objects or chain, stored in the cabinet falling down into the cut out, resulting in a serious flashover.

Risk of gaps within the panel allowing enough room for fingers to come into direct contact with live terminals resulting in serious electric shock/burns (as per photos below)

Before any work commences a thorough visual risk assessment of inside the cabinet must be undertaken. Where safe to do so all foreign debris must be carefully removed from the bottom of the cabinet. Where any gaps are identified within the cabinet or between the cabinet and the cut out, the Operative must rectify these defects. If it is not OS responsibility to rectify these defects, then AIRline must be informed, so the local DNO can take corrective action.

Exposed live cables behind Test Block

Half Clarke Cabinet with Protective Partition Fitted


5.26 CONNECTION OF EARTHING SYSTEMS TO CUT OUTS

A visual inspection must be made to establish the correct earthing system to be connected to a cut out. Fig 1 shows a combined neutral and earth. In this case the correct earthing system would be PME (TN-C-S).

The cut out shown in fig 2 has provision for a link bar to be fitted between the neutral and earth connections. This link has been left in the open position and must not be closed. The correct earthing arrangement in this case would be SNE (TN-S).

Where a BNO (business network operator) has installed cut outs in a block of flats fed from the local DNO service intake position, the BNO must always install SNE cut outs as per BS 7671.

If the cut out has a separate neutral and earth (fig 2) the cut out must not be connected to PME (TN-C-S).

Siemens must NOT close the link between neutral and earth on a SNE cut out.

Fig 1 Fig 2


Section 6

CT Operated Metering Commissioning Procedure


6.1 COMPLIANCE REQUIREMENT

The company shall as an approved Meter Operator undertake a commissioning procedure on all CT operated metering equipment, used for settlement purposes in accordance with the MOCOPA.

A commissioning test shall be performed on all new metering equipment, which is to provide metering data for settlements. Where replacement metering equipment is fitted as part of an existing metering system, a commissioning test covering the changes shall be conducted.

The Meter Operator shall provide such evidence to confirm that, following its commissioning, metering equipment shall meet the requirements of the Pooling and Settlement Agency (P&SA) and relevant Codes of Practice. This evidence will include a signed and dated commissioning record.

6.2 GENERAL COMMISSIONING PRINCIPLES

The commissioning procedure shall consist of three main areas:

Confirming Current Transformer (and Voltage Transformer where applicable) details and configuration information.

Checking metering system functionality and that the installation conforms to the appropriate Code of Practice.

Conducting a load comparison test (where practically possible) against an independent energy recording device.

Please refer to the Safe Working Methods (section 8) in this Code of Practice.

6.3 WORKING PRACTICES

Only approved commissioning procedures shall be undertaken by authorised Meter Operator staff in compliance with the PS&A Code of Practice.

Any wiring, instrument or tool that is damaged or otherwise unsafe shall be withdrawn from service. The wiring, instrument or tool shall either be repaired or replaced.

Any Working Standard used in undertaking the load comparison test shall be calibrated against Reference Standards or Transfer Standards. The records showing the


traceability and previous calibration checks on these standards shall be made available to the Settlement Systems Administrator (SSA) or its agent as required.

6.4 COMMISIONING PROCEDURE

Equipment Identification and Configuration

For all installations with new/replaced measurement transformers, the commissioning report shall include the following information:

a) The installed CT/VT details including, serial numbers, rating, accuracy class b) CT ratio c) VT ratio

For installations with existing measurement transformers, where it is not practically possible to obtain the information related to (a), (b), (c), the commissioning report shall include the VT and CT ratios in use and the method by which this information was obtained, i.e. via on-site inspection or from Distribution (or transmission) Business documentation.

The commissioning procedure shall include checks to confirm the VT & CT connections at the Meter Operator interface (Test Terminal Block) to the Distribution (or transmission) Business are correct. Details of the operational burden and any non-settlement burdens shall be recorded.

6.5 METER(S) CONFIGURATION AND OPERATION

The commissioning report shall include details related to the meter and measurement configuration, including:

a) Serial number, accuracy class, programmed CT & VT ratios. b) Register format and initial readings. c) Confirmation of register advance for Import & Export power flows. d) Confirmation of pulse outputs when linked to separate outstations. e) Correct meter operation on each phase independently in addition to normal

multiphase current operation. f) Correct operation of both local and remote communication ports where fitted. g) Confirmation that the meter time is set to GMT ±5 seconds.


6.6 LOAD COMPARISON TEST RESULT

The energy value recorded by the meter shall be checked against an independent energy recording device to establish the correct operation of the overall metering system.

Where for practical or safety reasons, only a secondary injection can be undertaken the report shall detail the VT/CT ratio confirmed under section (6.4) above.

6.7 CUSTOMER PULSING CONSIDERATION

WARNING

Before any work is conducted on a CT operated metering installation an investigation shall be undertaken to establish if the metering equipment outputs information to the customer.

If an interface exists between the metering equipment and the customer, no work shall be undertaken on the metering system without liaison with the customer to establish the effect of any changes.

6.8 OPERATIONS AFFECTING PULSE OUTPUTS OR DATA STREAMS

The following list details some of the changes that can affect the pulse output configuration and the data storage values.

1. Change of CT and/or VT ratio programmed into meter 2. Change of meter type/configuration 3. Removal of isolating links in pulse interface circuit 4. Removal of auxiliary supply fuses controlling interface circuitry 5. Secondary current injection for routine test purposes

6.9 CODE OF PRACTICE COMPLIANCE

The metering equipment shall be capable of providing the following pulse outputs as required locally by the customer:

1. Pulsing for Import kWh, Export kWh, Import kVArh, Export kVArh and kVAh. 2. 30 minute reset pulse from voltage free contacts.

In addition the customer may have access to the half hourly metering data, provided this is in accordance with the provisions of the P&SA and the agreed procedures. Such access must not interfere with or endanger the security of the data or the collection process for Settlement purposes. Customer access to stored metering data shall only be with the permission of the supplier.


6.10 TYPICAL EXAMPLE OF CT OPERATED METERING (Schematic Diagram 1)

Backup Fuses

If 16A/20A backup fuses are not installed, the installation must be reported to AIRline.


6.11 TYPICAL EXAMPLE OF CT OPERATED METERING (Schematic Diagram 2)

If 16A/20A backup fuses are not installed, the installation must be reported to AIRline.


6.12 ISOLATING LV CUBICLES

a) Where an LV cubical incorporates a moulded case breaker, isolation of the customer’s installation and metering equipment / CTs is via this breaker. Padlocks and safety notices must be attached to prevent unauthorised re-energisation.

b) For those LV cubicles that do not contain a moulded case breaker and are fed direct from an adjoining substation, isolation must be carried out by qualified Distribution Network staff only.

This is a Network Switching Operation that falls under Distribution Network procedures.

6.13 PRESENCE OF VOLTAGE ON A LV TEST BLOCK

When working on the LV test block, care must be taken regarding the unlikely presence of voltage. If a spark is noticed when opening or closing the CT links, checks of the panel wiring must be undertaken to determine if there is a loose termination or a possible open circuit CT, before any more work is carried out.


Section 7

Safe Working Methods Whole Current


7.1 Generic Risk Assessment at the Meter Position

7.2 Generic Risk Assessment of Meter Position and Cut Out (before work commences)

7.3 Working on Single and Multi Phase Cut Outs

7.4 Changing Single Phase Meter Where Access is Gained

7.5 Changing Single Phase Meter Where No Access

7.6 Installation of Single Phase Meters to an Energised Service (New Connections)

7.7 Changing a Multi Phase Meter Where Access to Installation Gained

7.8 Installation of Multi Phase Meters to an Energised Service (New Connections)

7.9 Changing a Single Phase Meter Where the Cut Out is Remote from the Meter Position

7.10 Reconnection of Single Phase Meter

7.11 Reconnection of Multi Phase Meter

7.12 Changing a Single Phase Meter to an Import/Export Meter

7.13 Changing a Multi Phase Meter to an Import/Export Meter

7.14 Installation of single phase whole current sub meter

7.15 Installation of multi phase whole current sub meter

7.16 Installation of Check Meters

7.17 Removal of Check Meters

7.18 De-energisation and Removal of Metering Equipment

7.19 Gas Escape Procedure (Domestic)


7.1 GENERIC RISK ASSESSMENT AT THE METER POSITION

It is essential that a generic risk assessment is carried out at the meter position before any work is started. If at anytime during the job a distraction occurs then the operative must re-assess the situation before work continues. This guide of evaluating risk must be applied to every task involving work on a meter or associated equipment. General Considerations

Specific Considerations

Area of Risk Description Control Measures

Metering Equipment

Is the meter and associated equipment in good condition (physically and electrically)?

Evaluate the associated risk before proceeding with any work.

Cables Are the customer’s load tails suitable for use and comply with BS 7671?

Inspect panel wiring.

Check if correct size and fit for purpose. Evaluate panel wiring and replace as necessary.

Extraneous metalwork

Check for any voltage on any surrounding metalwork

Using a neon testoscope confirm there is no voltage present

Asbestos

Consider the age of the installation when evaluating the presence of asbestos.

Treat asbestos in accordance with company policy.

Direct electrical contact

Can the cut out, meter or other live contacts be shrouded?

Use appropriate shrouds and/or shrouding material.


Access

Can safe access be gained to the meter position? Considerations to be taken into account include: obstructions, height, space restraints, difficult to reach, etc.

Remove any restrictions where possible and use correct tools, equipment and PPE.

Egress

Can a safe exit be made from the Meter position in case of emergency

Ensure that egress is always clear.

Environment

Are conditions wet, dusty, noisy, icy etc, on site and at the meter position. Be aware of third party vehicles and machinery.

Always consider environmental conditions while on site. Wear reflective garments and make yourself visible whilst on site.

Lighting

Is there enough light at the meter position to enable safe working.

Ensure that there is adequate lighting to carry out the job safely.

People and Animals

Are there people or animals in the area of work that may cause distractions whilst carrying out the job?

If distracted always re-assess the situation.


7.2 GENERIC RISK ASSESSMENT AT THE METER POSITION AND CUT OUT (BEFORE WORK COMMENCES)

Considerations


General Damage Carry out a visual inspection and note any obvious damage to any equipment.

Evaluate the associated risk before proceeding with any work.

Proximity of the cut out to metallic objects

Note any gas, water or steel structure that may restrict the removal of the cut out fuse.

Ensure that any door enclosure can be easily opened or removed without contact to any metallic surface. Insulate surfaces where reasonably practicable. Inform AIRline if the work cannot go ahead.

Water and dampness Are there any signs of dampness or water marks around the cut out and equipment.

Check for leakage of voltage around the cut out and equipment using an approved neon tester. Wear the appropriate PPE when it is deemed safe to continue with the work.

Seals

Inspect the seals for signs of tampering.

Test seals for leakage of voltage with an approved neon tester.

If tampering is suspected then contact AIRline immediately. If voltage is detected, where possible, carry out further tests using test lamps. If unsure contact your Line Manager.

Leaking compound If leaking compound is excessive, then tracking of compound up the fuse carrier may be evident.

Do not try to remove the cut out fuse with pliers or other mechanical aids. If the fuse cannot be removed whilst wearing appropriate PPE by hand, then inform AIRline.

Sign of burning

If there are signs of burning to cables, meters, associated equipment or the cut out, then approach the work with extra caution.

Before physically inspecting the area of burning always ensure that the installation is de-energised where reasonably practicable.

Cable damage Visually inspect all cables for signs of damage or breakdown of insulation including the incoming Network Cable.

If damage to the Network Cable has occurred, then contact AIRline. Where damage to customer tails has occurred, then follow the guidance as per this COP.

Meter board

Ensure that the board is securely fixed to the wall. If cement based, treat as asbestos. If the board is rotten, treat with caution as the cut out fuse may prove difficult to remove.

Re-fix if safe to do so. Refer to section 5.8 Refer to section 2.22 Replace meter board if the cut out is not on the board. Support cut out base while removing fuse carrier. Inform AIRline if the DNO need to attend.


7.3 WORKING ON SINGLE AND MULTI PHASE CUT OUTS

No Action Detail

1 General risk assessment

A general risk assessment must be carried out in accordance with Safe Working Method 7.1.

2 Specific visual inspection of the cut out and meter position

A specific visual inspection to evaluate the risks must be conducted in accordance with Safe Working Method 7.2. if at this stage it is deemed that the meter board contains Asbestos then the job will be aborted and AIRline informed.

3

Eye protection must be worn before working on single and multi phase cut outs

Eye protection MUST be worn when working on all domestic and industrial type cut outs or when carrying out tasks that involve a risk of eye injury. Pitted or scratched lenses are dangerous and should be replaced immediately.

4

Test for voltage on the cut out seals

(ALL CUT OUT TYPES)

Using an approved neon testoscope, test for voltage on the cut out seals. If voltage is detected diagnose where voltage source is from i.e. dampness, if this cannot be determined contact Line Manager and seek advice.

5

Test for voltage on the casing of the cut out.

(METAL CLAD CUT OUT ALL TYPES)

Using an approved neon testoscope, test for voltage on the casing of the cut out. If voltage is detected diagnose where voltage source is from i.e. dampness, if this cannot be determined call AIRline and seek advice from a Line Manager.

Insulated cut outs

Single & Three Phase

Metal Clad cut outs Single &

Three Phase

Phase Industrial type

Cut outs (All Insulated)

Remove the cut out seals

Care must be taken to ensure that sealing wire or debris does not fall into any gaps in the cut out.

Ensure that any debris is removed from around the top of the cut out i.e. disused sealing wire, cable strands or foreign objects.








Open the cut out enclosure door

Approved insulated gloves Must be worn at all times whilst carrying out this operation.

Be aware of any obstacles that may prevent the enclosure being opened i.e. gas pipes or other electrical cables.







Visually inspect the fuse chamber and fuse carrier before withdrawing the cut out fuse

Before the fuses are withdrawn visually inspect the fuse chamber and carrier for damage or signs of stress as per Safe Working Method 7.2.

Ensure that all fuse barriers are in place.







Remove the cut out fuse (approved insulated gloves MUST be worn for this operation)

On removal inspect the carrier for signs of stress or damage.

Visually inspect the fuse size to ascertain it matches the installation in accordance with 5.14 of this Code of Practice

Do not use any mechanical aids to remove the fuse carrier.

Remove the cut out fuse

(approved insulated gloves MUST be worn for this operation)




Remove the cut out fuse (approved insulated gloves MUST be worn for this operation)





Fuse barriers Carry out a visual inspection and note any obvious damage to or absence of fuse barriers. If barriers are missing from the cut out report to AIRline and abort job.



Inspection of the fuse carrier Look for signs of stress or damage. Take note of any discoloration of the fuse prongs, as this could indicate loose or damaged connections.

Check the carrier has the correct size fuse for the installation Check terminals and fuse holders for tightness. Inform AIRline if the work cannot go ahead. Change fuse where necessary

Inspection of the fuse carrier Look for signs of stress or damage. Take note of any discoloration of the fuse prongs, as this could indicate loose or damaged connections. Check the carrier has the correct size fuse for the installation Check terminals and fuse holders for tightness. Inform AIRline if the work cannot go ahead. Change fuse where necessary

Inspection of the fuse carrier Look for signs of stress or damage. Take note of any discoloration of the fuse prongs, as this could indicate loose or damaged connections. Check the carrier has the correct size fuse for the installation Check terminals and fuse holders for tightness. Inform AIRline if the work cannot go ahead. Change fuse where necessary

Presence of asbestos Inspect old switch gear as it may contain asbestos including the fuse carriers Wear FFP3 face mask where presence of asbestos is suspected.



Cut out chamber/base Inspect the cut out chamber/base for signs of overheating, loose terminals and excessive debris. Ensure that compound is not tracking up the fuse holder. If signs of overheating are

Cut out chamber/base Inspect the cut out chamber/base for signs of overheating, loose terminals and excessive debris. Ensure that compound is not tracking up the fuse holder. If signs of overheating are present

Cut out chamber/base Inspect the cut out chamber/base for signs of overheating, loose terminals and excessive debris. Ensure that compound is not tracking up the fuse holder. If signs of overheating are present


present on the incoming side of the cut out, this must be referred to AIRline. If compound is present, ensure that sound electrical contact is made between the fuse carrier and holder on re-energisation.

on the incoming side of the cut out, this must be referred to AIRline. If compound is present, ensure that sound electrical contact is made between the fuse carrier and holder on re-energisation.

on the incoming side of the cut out, this must be referred to AIRline. If compound is present, ensure that sound electrical contact is made between the fuse carrier and holder on re-energisation.

Cut out terminals All terminals must be tight as not to cause overheating. Functional tightness of outgoing terminals must take place on all work. Exception to this is the incoming live terminals, if it is deemed that these are loose, then it must be reported to AIRline and DNO must attend.



Confirm the polarity of the cut out.

The polarity of the cut out must be confirmed using an approved testing device.





Shroud live terminals

Shroud all live incoming terminals with approved shrouds

When work is required inside or around the cut out i.e. changing tails then approved shrouds or shrouding material should be used where reasonably practical to prevent direct contact. Approved insulated gloves MUST be worn when shrouding

Shroud Live Terminals

Shroud all live incoming terminals by closing the cut out enclosure or door.

When work is required inside or around the cut out i.e. changing tails then approved shrouds or shrouding material should be used where reasonably practical to prevent direct contact.

Approved insulated gloves MUST be worn when shrouding

Shroud Live Terminals

Shroud all live incoming terminals by closing the cut out enclosure or door.

When work is required inside or around the cut out i.e. changing tails then approved shrouds or shrouding material should be used where reasonably practical to prevent direct contact.

Approved insulated gloves MUST be worn when shrouding


Replacing the cut out fuse (approved insulated gloves and eye protection MUST be worn when carrying out this operation)

Before the cut out fuse is replaced ensure that all fuse barriers are in place and they are in good condition.

Align the fuse blades with the terminals inside the cut out, insert into the dead terminal first then push the fuse carrier firmly into the live terminal.







Replace covers securely and ensure all seals applied as necessary



Take extra care when removing the lid from trunking to facilitate the marking of tails as cables may spring forward.




7.4 CHANGING A SINGLE PHASE METER WHERE ACCESS IS GAINED

No Action Detail



2 Plug in test at socket outlet

On access to the installation the polarity must be tested at one of the socket outlets using an approved plug in polarity testing device with an audible tone. If at this stage the polarity is incorrect then another socket must be tested, if this socket is also reversed AIRline and the Line Manager must be contacted immediately. If it is evident that only one socket is reversed the work can continue. The appropriate “DO NOT USE” sticker must be applied to the socket and a fault card left with the customer.

3 Specific visual inspection of the meter position

A specific visual inspection to evaluate the risks must be conducted in accordance with Safe Working Method 7.2.

4 Polarity indication check

The polarity indication test must be conducted using an approved volt stick . The volt stick must be proved operational by testing on the live supply. Indication of polarity must be conducted at:

Incoming cut out fuse Cut out to meter live cable Outgoing live tail to customers installation All neutral cables must be tested for zero voltage

If the polarity is reversed at one of the above positions contact a Line Manager immediately.

5 Power down

The customer must be asked to power down their equipment before the main switch is turned off. Note the main switch positions as some switches may already be in the OFF position and must remain in the OFF position on re energisation.

6

Remove the main fuse (insulated gloves and eye protection must be worn)

On removal of the main fuse a full assessment of the condition of the fuse carrier must be undertaken in accordance with Safe Working Method 7.3.


7

Confirm polarity at the cut out with main fuse carrier removed

Using an approved volt stick confirm the polarity on the incoming live terminal of the cut out. Note: If volt stick fails, use approved neon testoscope. The incoming live terminal must then be shrouded (where practicable).

8

Remove terminal cover’s and prove the meter DEAD

Remove meter terminal cover’s and prove the meter dead using an approved test lamp ; the lamp must be proved before and after the test either using the proving unit supplied with the test lamp or on a known live supply.

9

Apply permanent polarity markers

Incoming and outgoing tails to be marked with one marker, both

live and neutral. Off peak circuits must be identified with two markers.

Tails should be marked before removing them from the meter. NB: If the tails cannot be marked while still connected to the meter, they must be marked individually as they are removed from the terminal.

10

Change the meter/associated equipment

Ensure that the correct meter and tariff are being installed as per the job instruction. When working at a multi service position installation with the tails removed from the meter, check for back feeds using a volt stick.

11

Tightness check

Ensure that all terminals are tight including the out-going side of the cut out and neutral block and other associated equipment terminals.

12

Glow test

After the installation of the new meter and with the customer’s main switch in the off position, conduct a Glow Test in accordance with guidance in 4.15 of this COP.

13

Visual inspection

Visually inspect the installation ensuring that cable colours, cable markers and sequence of cables are all correct.

14

Replace terminal covers and re-energise installation (insulated gloves and eye protection must be worn)

Replace the terminal covers and install the main fuse into the cut out ensuring that the fuse is inserted into the dead side of the cut out first and then the live contact second where applicable.


15

Polarity indication check


Incoming cut out fuse Cut out to meter live cable Meter to consumers main switch live All neutral cables must be tested for zero voltage


16

Final visual checks

Visually inspect the work carried out and confirm that the installation is safe, cables marked and wired correctly.

17

Switch on customers main switch

Inform the customer that the installation is to be re-energised. Ensure that all main switches are turned back ON. Switches that where in the OFF position at the start of the job must remain in the OFF position.

18

Plug in test at a socket outlet and affix witness label

Test the same socket on the customer’s installation that was tested in stage 2 of this procedure. The installation must be left in the state of correct polarity. Ask the customer to witness the plug in test .

19

Seal equipment and leave meter readings

Leave the old and new meter details on the appropriate card at the meter position. Seal all equipment and remove any waste material.


7.5 CHANGING A SINGLE PHASE METER WHERE NO ACCESS

(APPOINTMENT HAS BEEN MADE WITH THE CUSTOMER)

Note – Meters MUST NOT be changed on cold calls if the customer is not present

No Action Detail

1

General risk assessment


2

Specific visual inspection of the meter position

A specific visual inspection to evaluate the risks must be conducted in accordance with Safe Working Method 7.2

3


The polarity indication test must be conducted using an approved volt stick . The volt stick must be proved operational by testing on the live supply.

Indication of polarity must be conducted at:



4

Load on the meter

The load on the meter must be assessed to be below 5 Amps before the main fuse is withdrawn. If it is deemed excessive, re-evaluate if the customer is present at the property. Providing no cabling needs to be changed and no auxiliary equipment needs to be removed the job can go ahead. If there is auxiliary equipment the job should be aborted until customer is present.

5


On removal of the main fuse a full assessment of the condition of the fuse carrier must be undertaken in accordance with Safe Working Method 7.3


6



7

Remove terminal cover and prove the meter DEAD


8





9

Confirm Inner Core Colours

Refer to section 4.4 of this Code of Practice It is essential to gain access to confirm Polarity where the inner cores do not match the meter terminals. If customer tails are undersized fit isolator. (Section 5.3)

10


Ensure that the correct meter and tariff are being installed as per the job instruction. When working at a multi service position installation with the tails removed from the meter, check for back feeds using a volt stick.

11

Tightness check

Ensure that all terminals are tight including the out-going side of the cut out and neutral block.

12

Glow test

After the installation of the new meter and with the customer’s tails disconnected, conduct a Glow Test in accordance with guidance in 4.15 of this COP.

13

Reconnect customers tails

Reconnect the customer’s tails into the meter/isolator taking note of the cable markers.


14

Visual inspection

Visually inspect the installation ensuring that cable colours, cable markers and sequence of cables are all correct.

15

Replace terminal covers and re-energise installation (insulated gloves and eye protection must be worn Inserting/Removing fuses )

Replace the appropriate terminal covers and install the main fuse into the cut out ensuring that the fuse is inserted into the dead side of the cut out first and then the live contact second.

16




Incoming cut out fuse Cut out to meter live cable Meter to consumers main switch live both sides of isolator if installed All neutral cables must be tested for zero voltage


17

Final visual checks


Complete witness sticker and write “CPN” (Customer Not Present)

18




7.6 INSTALLATION OF SINGLE PHASE METERS TO AN ENERGISED SERVICE (NEW CONNECTIONS)

No Action Detail

1



2

Site induction

Operatives may be requested to attend a site induction by the site Manager; this is to fulfil Health and Safety legislation. On all occasions when visiting a site the Operative MUST sign in and let the site representative know he/she is on site.

3


A specific visual inspection to evaluate the risks must be conducted in accordance with Safe Working Method 7.2. For areas of special risk, i.e. building site temporary supplies refer to 4.12 of this Code of Practice

4



5

Confirm supply at the cut out

Prove the supply at the cut out using an approved test lamp ; the lamp must be proved before and after the test either using the proving unit supplied with the test lamp or on a known live supply.

6



Install Meter and Isolator Test / Inspect and Connect

Conduct a visual inspection of the installation for its compliance with:


ESQC Regs 2002 BS 7671 PME Requirements

Validate ELZ reading at the cut out.

TN-C-S (PME) = < 0.38 ohms TN-S (Sheath) = < 0.8 ohms DNO variations may apply please refer to Earthing Guidance Notes

Validate ELZ reading at the cut out. TN-C-S (PME) = < 0.38 ohms TN-S (Sheath) = < 0.8 ohms DNO variations may apply please refer to Earthing Guidance Notes

Install metering equipment, isolator and PME

earth block. DO NOT connect any of the customer’s tails or earthing. Ensure that all terminals are tight including the out-going side of the cut out and neutral block.

Install metering equipment and connect customer tails if compliant with above. Ensure that all terminals are tight including the out going side of the cut out and neutral block.

N.B. If the above requirements are not met take appropriate action as per contractual requests and leave appropriate fault card with site representative.

Mark the cables with approved markers Mark the cables with approved markers

Remove consumer unit cover and visually

inspect that customer’s tails are connected. Conduct a Glow Test in accordance with

guidance in 4.15 of this COP. Conduct a Glow Test in accordance with

guidance in 4.15 of this COP. Energise the installation after replacing

terminal covers. (Insulated gloves and eye protection must be worn)

Energise the installation after replacing terminal covers leaving the consumer unit in the off position. (Insulated gloves and eye protection must be worn)

Polarity Indication Check



Incoming cut out fuse Cut out to meter live cable Meter to Isolator

All neutral cables must be tested for zero voltage

Polarity Indication Check



Incoming cut out fuse Cut out to meter live cable


Confirm the supply on the contractors side of the isolator using an approved test lamp, the lamp must be proved before and after the test using the proving unit supplied with the test lamp, in accordance with guidance in 4.20 of this COP.

Confirm the supply at the incoming terminals of the consumer unit using an approved test lamp, the lamp must be proved before and after the test using the proving unit supplied with the test lamp, in accordance with guidance in 4.20 of this COP.


Confirm the polarity on the contractors side

of the isolator using an approved volt stick / neon tester.

Replace cover and leave isolator in the off position.

Confirm the polarity at the consumer unit (including off peak switches) with switch in the off position.

Where polarity cannot be confirmed using a volt stick with the consumer unit cover in situ ensure that the main switch, breakers/fuses are off/removed before removing the consumer unit cover.

Confirm polarity at the incoming cable connections. Attach appropriate labels/stickers and seal

all equipment. - Disclaimer must be screwed to meter board - PME Earth Label - Witness sticker

Attach appropriate labels/stickers and seal all equipment.

- Disclaimer must be screwed to meter board - PME Earth Label - Witness sticker

Leave the new meter details on the

appropriate card at the meter position. Remove any waste material

Leave the new meter details on the appropriate card at the meter position. Remove any waste material


7.7 CHANGING A MULTI PHASE METER WHERE ACCESS TO INSTALLATION GAINED

No Action Detail

1



2

Plug in test at socket outlet


3



4



Incoming cut out fuses Cut out to meter live cables Outgoing live tails to customers installation All neutral cables must be tested for zero voltage


5

Power down

The customer must be asked to power down their equipment before the main switch is turned off. Note the main switch positions as some switches may already be in the OFF position and must remain in the OFF position on re energisation. Ask the customer or their representative if they have a generator that may start after the installation is de-energised.


6

Remove the main fuses. (Insulated gloves and eye protection must be worn)

On removal of the main fuses a full assessment of the condition of the fuse carrier’s must be undertaken in accordance with Safe Working Method 7.3.

7

Confirm polarity at the cut out with main fuse carriers removed

Using an approved volt stick confirm the polarity on the incoming live terminals of the cut out. Note: If volt stick fails, use approved neon testoscope. The incoming live terminal must then be shrouded (where practicable).

8

Remove terminal cover off the meter, re-energise and confirm the phase sequence (Insulated gloves and eye protection must be worn)

Remove terminal cover from meter, re-energise and confirm the phase sequence of the meter using an approved PSI. The phase sequence will be either: Standard ABC – RYB – L1 L2 L3 Non Standard BAC – YRB – L2 L1 L3

9

De-energise and prove dead (Insulated gloves and eye protection must be worn)

Prove the meter dead using an approved test lamp ; the lamp must be proved before and after the test either using the proving unit supplied with the test lamp or on a known live supply. Special consideration must be given to the possibility of back feeds via a generator. The incoming live terminals must be shrouded (where practicable).

Standard Phase Sequence

Non Standard Phase Sequence

Mark the incoming and outgoing tails in pairs using the approved markers L1- L2- L3 and N. NB: If the tails cannot be marked while still connected to the meter, they must be marked individually as they are removed from the terminal.

Ensure that in this situation that the pairs of tails are identified (incoming and outgoing). Mark the tails across the meter as L1-L3-L2 and N. NB: If the tails cannot be marked while still connected to the meter, they must be marked individually as they are removed from the terminal.

Change the meter ensuring that the pairs stay together L1-L2-L3-N in their respective pairs.

Change the meter ensuring that the tails are connected as L1-L2-L3-N in their respective pairs.


Carry out a visual inspection


Ensure that all terminals are tight including the outgoing side of the cut out and neutral block and any other associated equipment terminals


Conduct a Glow Test on each phase of the meter in accordance with guidance on 4.15 of this COP.

Conduct a Glow Test on each phase of the meter in accordance with guidance in 4.15 of this COP.

Conduct a One Fuse Test on each phase of the meter in accordance with guidance on 4.16 of this COP. (Insulated gloves and eye protection must be worn Inserting/Removing fuses)

Conduct a one fuse test on each phase of the meter in accordance with guidance on 4.16 of this COP. (Insulated gloves and eye protection must be worn Inserting/Removing fuses)

Re-Energise and Confirm the Phase Sequence at meter terminals (Insulated gloves and eye protection must be worn Inserting/Removing fuses)

Re-Energise and Confirm the Phase Sequence is Standard at meter and main switch (Insulated gloves and eye protection must be worn Inserting/Removing fuses)

De-Energise and replace meter terminal cover (Insulated gloves and eye protection must be worn when Inserting/Removing fuses)

De-Energise and replace meter terminal cover (Insulated gloves and eye protection must be worn when Inserting/Removing fuses)

Final visual checks Visually inspect the work carried out and confirm that the installation is safe, cables marked and wired correctly.


Re-energise (Insulated gloves and eye protection must be worn)

Re-Energise (Insulated gloves and eye protection must be worn)

Turn on main switches as appropriate after informing the customer or the customer’s representative.



Plug in test at a socket outlet and affix witness label Test the same socket on the customer’s installation that was tested in stage 2 of this procedure. The installation must be left in the state of correct polarity. Ask the customer to witness the plug in test . Sign and affix the witness label.

Plug in test at a socket outlet and affix witness label Test the same socket on the customer’s installation that was tested in stage 2 of this procedure. The installation must be left in the state of correct polarity. Ask the customer to witness the plug in test . Sign and affix the witness label.

Ensure with customer that multi phase equipment operates correctly


Seal equipment and leave meter readings. Leave the old and new meter details on the appropriate card at the meter position. Seal all equipment and remove any waste material.



7.8 INSTALLATION OF MULTI PHASE METERS TO AN ENERGISED SERVICE (NEW CONNECTIONS)

No Action Detail

1



2

Site induction

Operatives may be requested to attend a site induction by the site Manager, this is to fulfil Health and Safety legislation. On all occasions when visiting a site the Operative MUST sign in and let the site Representative know he/she is on site.

3


A specific visual inspection to evaluate the risks must be conducted in accordance with Safe Working Method 7.2 For areas of special risk, i.e. building site temporary supplies refer to 4.12 of this Code of Practice

4


On removal of main fuse a full assessment of the condition of the fuse carrier’s must be undertaken in accordance with Safe Working Method 7.3.

5

Confirm supply at the cut out. (phase to phase and phase to neutral)


6


Using an approved volt stick confirm the polarity on the incoming live terminal of the cut out. Note: If volt stick fails, use approved neon testoscope.

7

Confirm phase sequence at the cut out

Using an approved Phase Sequence Indicator (PSI), confirm the phase sequence of the incoming live terminals of the cut out. The incoming live terminal must be shrouded (where practicable).


Install Meter and Isolator (not contractually

required)

Test / Inspect and Connect

Conduct a visual inspection of the installation

for its compliance with: ESQC Regs 2002 BS 7671 PME Requirements

Validate ELZ reading at the cut out

TN-C-S (PME) = < 0.35 ohms TN-S (Sheath) = < 0.8 ohms DNO variations may apply please refer to Earthing Guidance Notes

Install meter and any other associated equipment Ensure that all terminals are tight including the outgoing side of the cut out and neutral block.

Mark the cables with approved markers L1-L2-L3-N connect customer’s tails as appropriate ensuring standard phase sequence at the meter

Conduct a Glow Test in accordance with guidance in 4.15 of this COP.

Conduct a one fuse test on each phase of the meter in accordance with 4.16

Visually inspect the installation ensuring that cable colours, cable markers and sequence of cables are all correct

Remove distribution board covers where practicable


Energise the installation

Confirm phase sequence at the meter and associated equipment using a PSI

Confirm supply (where practicable) at the: - Distribution Board using an approved test lamp; the lamp must be proved before and after the test either using the proving unit supplied with the test lamp or on a known live supply. (all breakers off or fuses out and main switch in the on position)

Confirm phase rotation (where practicable) at the: - Distribution Board using a phase sequence indicator (PSI) (all breakers off or fuses out and main switch in the on position)

Conduct a polarity indication test (where practicable) at the: - Distribution Board using a volt stick (all breakers off or fuses out and main switch in the on position)

De-energise supply and replace ALL covers to the meter, distribution board and associated equipment

Re-energise installation

Attach appropriate labels/stickers and seal all equipment. - Disclaimer must be screwed to meter board - PME Earth Label - Witness sticker

Leave the new meter details on the appropriate card at the meter position. Remove any waste material


7.9 CHANGING A SINGLE PHASE METER WHERE THE CUT OUT IS REMOTE FROM THE METER POSITION

No Action Detail

1



2


On access to the installation the polarity must be tested at one of the socket outlets using an approved plug in polarity testing device with an audible tone. If at this stage the polarity is incorrect then another socket must be tested, if this socket is also reversed AIRline and the Line Manager must be contacted immediately. If it is evident that only one socket is reversed the work can continue. The appropriate “DO NOT USE” sticker must be applied to the socket and a fault card left with the customer. * If No Access to installation proceed to Stage 3 below

3



4




Incoming and outgoing live meter tails

All neutral cables must be tested for zero voltage If the polarity is reversed at the above position contact a Line Manager immediately.

5

Power down

The customer must be invited to power down their appliances before the main switch is turned off. Note the main switch positions as some switches may already be in the OFF position and must remain in the OFF position on re-energisation.

If No Access to installation proceed to Stage 6 below


6


Identify the location from where the meter is fed. This would normally be a locked multi-way intake position situated in another room or cupboard either within the building or outside. If the source of supply (fuse carrier) to the meter cannot be located the job must be terminated until more site-specific information becomes available. The use of a “fuse finder” may be applicable in certain circumstances. On removal of the main fuse a full assessment of the condition of the fuse carrier’s must be undertaken in accordance with Safe Working Method 7.3.

7


Using an approved volt stick confirm the polarity on the incoming live terminal of the cut out.

Note: If volt stick fails, use approved neon testoscope.

8

Warning signage and securing the intake position against unauthorised entry

To ensure that no other person (e.g. distribution operative or site caretaker etc) accidentally re-energises the rising main from the intake position it is important that the fuse is removed from the fuse carrier and kept with the operative. The empty fuse carrier must be replaced in the cut out and sealed. Appropriate safety notices must be displayed warning that work is being carried out on the installation. Covers/doors on multi-ways/service heads must be replaced to shield any exposed live terminals and appropriate warning signage must be attached at the supply position. Where practicable the intake room/cupboard should be re-locked to prevent unauthorised access. If the intake room is deemed to be at risk of entry by unauthorised persons (inc. children) while the work is being carried out, consideration must be given to sealing up any removable covers with high security seals.

9



10






11


Ensure that the correct meter and tariff are being installed as per the job instruction. When working at a multi service position installation with the tails removed from the meter, check for back feeds using a Volt Stick.

12

Tightness test

Ensure that all terminals are tight including the out-going side of the cut out and neutral block and other associated equipment

15

Glow test

With the customer’s main switch(es) already in the OFF position put Test Lamp probes across cut out terminals and carry out Glow Test. See 4.15 of this COP. If No Access to installation proceed to Stage 16

13

Visual inspection

Visually inspect the meter installation ensuring that cable colours, polarity markers and sequence of cables are all correct.

14

Fit terminal cover

Fit terminal cover to meter before re-energising supply at remote service intake location.

16

Re-energise installation (Insulated gloves and eye protection must be worn)

Install the main fuse into the cut out ensuring that the fuse is inserted into the dead side of the cut out first and then the live contact second where applicable.

17





18

Final visual checks

Visually inspect the work carried out and confirm that the installation is safe and wired correctly


19

Switch on customer’s main switch

Where applicable ensure that all customer’s main switches are turned back ON. Switches that where in the OFF position at the start of the job must remain in the OFF position.

20


Test the same socket on the customer’s installation that was tested in stage 2 of this procedure. The installation must be left in the state of correct polarity. Ask the customer to witness the plug in test. Sign and affix the witness label.

21




7.10 RECONNECTION OF SINGLE PHASE METER

No Action Detail

1


A general risk assessment must be carried out in accordance with Safe Working Method 7.1

2



3


The polarity indication test must be conducted using an approved volt stick . The Volt Stick must be proved operational by testing on the live supply. Indication of polarity must be conducted at.

Incoming cut out fuse All neutral cables must be tested for zero voltage

If the polarity is reversed at any one of the above positions. Contact a Line Manager.

4

Specific visual inspection of the installation

Conduct a visual inspection of the installation for its compliance with. ESQC Regs 2002 BS 7671 PME Requirements

5

Main switches

Ensure all the customers switches are in the off position

6

Remove the main fuse. (Insulated gloves and eye protection must be worn)

On removal of the main fuse a full assessment of the condition of the fuse carrier must undertaken in accordance with Safe Working Method 7.3

7

Risk assessment at the cut out

A full risk assessment must be undertaken at the cut out in accordance with Safe Working Method 7.3

8


Using an approved volt stick confirm the polarity on the incoming live terminal of the cut out. Note: If volt stick fails, use approved neon testoscope.


9

Confirm earthing arrangement

Validate ELZ reading at the cut out and ensure that it falls within the contractual guidelines of permissible values.

10 Remove terminal cover and prove the meter DEAD


11

Tightness Test

Remove meter terminal cover and ensure that all terminals are tight including the out-going side of the cut out and neutral block and other associated equipment. Replace all terminal covers.

12

Glow Test

With the customer’s main switch in the off position, conduct a Glow Test in accordance with guidance in 4.15 of this COP.

13


Fit appropriate size fuse in the fuse carrier for the cable size and ELZ reading. Install the main fuse into the cut out ensuring that the fuse is inserted in to the dead side first and then the live contact second

14


The polarity indication test must be conducted using an approved volt stick . The volt stick must be proved operational by testing on the live supply. Indication of polarity must be conducted at: Incoming cut out fuses Cut out to meter live cables Outgoing live tails to customers installation All neutral cables must be tested for zero voltage


15

Confirm supply at customers main switch

Confirm the supply at the consumer unit (including off peak switches) with switch in the off position, using an approved test lamp. The lamp must be proved before and after using the attached proving unit.

Ensure that the main switch, breakers/fuses are off / removed before removing the consumer unit cover.


16

Confirm polarity at customers main switch

Confirm the polarity at the consumer unit (including off peak switches) with switch in the off position.

Ensure that the main switch, breakers/fuses are off/removed before replacing the consumer unit cover.

17

Final visual checks

Visually inspect the work carried out and confirm installations is safe, cables marked, correctly wired and all switches in the off position

18

Seal all equipment and attach labels

Fit disclaimer notice. Fit PME notice where appropriate. Sign and affix the witness label.

19

Leave the new meter details

Leave a copy of the start readings at the meter position or with the customer if requested. Remove any waste material


7.11 RECONNECTION OF MULTI PHASE METER

No Action Detail

1



2




The polarity indication test must be conducted using an approved volt stick . The Volt Stick must be proved operational by testing on the live supply. Indication of polarity must be conducted at.

Incoming cut out fuse All neutral cables must be tested for zero voltage


4

Specific visual inspection of the installation

Conduct a visual inspection of the installation for its compliance with:

ESQC Regs 2002

BS 7671 PME Requirements

5

Main switches

Ensure all the customers switches are in the off position

6

Remove the main fuse. (Insulated gloves and eye protection must be worn)

On removal of the main fuses a full assessment of the condition of the fuse carriers must undertaken in accordance with Safe Working Method 7.3

7

Confirm polarity at the cut out with the main fuse carriers removed

Using an approved volt stick confirm the polarity on the incoming live terminals of the cut out.



8

Confirm three phase supply at the cut out


9

Confirm phase sequence at the cut out

Using an approved PSI, confirm the phase sequence of the incoming live terminals of the cut out. The incoming live terminals then must be shrouded (where practicable)

10

Confirm earthing arrangement

Validate ELZ reading at the cut out and ensure that it falls within the contractual guidelines of permissible values

11

Remove meter terminal covers and prove meter dead

Remove Meter Terminal Covers and Prove Meter Dead using an approved test lamp ; the lamp must be proved before and after the test either using the proving unit supplied with the test lamp or on a known live supply.

12

Ensure that all terminals are tight

Ensure that all terminals are tight including the outgoing side of the cut out and neutral block and any other associated equipment terminals. i.e. contactors.

13

Conduct a Glow Test on Each Phase

At the meter and with the customer’s main switch in the off position, conduct a Glow Test in accordance with guidance in 4.15 of this COP.

14

Conduct a One Fuse Test on each phase

Conduct a one fuse test on each phase of the meter in accordance with the guidance in 4.16 of this COP

15

Re-energise installation and carry out polarity indication test on meter tails

(Insulated gloves and eye protection must be worn when Inserting/Removing fuses)

Fit appropriate size fuse in the fuse carrier for the cable size and ELZ reading. Install the main fuse into the cut out ensuring that the fuse is inserted in to the dead side first and then the live contact second

The polarity indication test must be conducted using an approved Volt Stick. The Volt Stick must be proved operational by testing on the live supply.

Indication of polarity must be conducted at.

Incoming cut out fuse Cut out to meter live cables Outgoing live tails to customer installation All neutral cables must be tested for zero voltage



16

Identify phase sequence at the meter and main switch terminals

Identify the phase sequence at the meter and main switch terminals (including off peak switches) with switch in the off position using PSI. The phase sequence will be either:

Standard e.g. ABC – RYB – L1 L2 L3

Non Standard e.g. BAC – YRB – L2 L1L3

17

Confirm polarity and supply at customer’s main switch (including off peak switches) with switch in the off position.

Confirm Polarity and Supply at Customers Main Switch (including off peak switches) with switch in the off position.

• Where polarity cannot be confirmed using a volt stick with the consumer unit cover in situ ensure that the main switch, breakers/fuses are off/removed and supply disconnected before removing the consumer unit cover.

• Confirm supply using an approved test lamp ; the lamp must be proved before and after the test either using the proving unit supplied with the test lamp or on a known live supply.

18

De-energise and prove meter dead


De-energise and Prove Meter Dead using an approved test lamp ; the lamp must be proved before and after the test either using the proving unit supplied with the test lamp or on a known live supply.


Standard Phase Sequence Non Standard Sequence

Mark the incoming and outgoing tails in pairs using the approved markers L1-L2-L3 and N.

NB: If The tails cannot be marked while still connected to the meter, they must be marked individually as they are removed from the terminal.

Ensure that in this situation that the pairs are identified (incoming and outgoing). Mark the tails across the meter as L1-L3-L2 and N.


Reconnect the tails as L1-L2-L3 and N in their respective pairs

Carry out visual Inspection

Carry out visual Inspection


Ensure that all terminals are tight including the outgoing side of the cut out and neutral block, other associated equipment terminals and customer main switch terminals.

Ensure that all terminals are tight including the outgoing side of the cut out and neutral block, other associated equipment terminals and customer main switch terminals.

Conduct a glow test on each phase of the meter in accordance with guidance on 4.15 of this Code of Practice

Conduct a glow test on each phase of the meter in accordance with guidance on 4.15 of this Code of Practice

Conduct a one fuse test on each phase of the meter in accordance with guidance on 4.16 of this Code of Practice

Conduct a one fuse test on each phase of the meter in accordance with guidance on 4.16 of this Code of Practice

Replace all covers Replace all covers

Re-energise and seal all equipment. Ensure customers main switch is left in the off position.


Re-energise and seal all equipment. Ensure customers main switch is left in the off position.


Attach labels: Disclaimer, PME where appropriate.

Sign and affix the witness label.

Attach labels: Disclaimer, PME where appropriate.

Sign and affix the witness label.

Seal equipment and leave meter readings . Leave the existing meter details on the appropriate card at the meter position. Seal all equipment and remove any waste material.

Seal equipment and leave meter readings . Leave the existing meter details on the appropriate card at the meter position. Seal all equipment and remove any waste material.


7.12 CHANGING A SINGLE PHASE METER TO AN IMPORT / EXPORT METER WHERE ACCESS IS GAINED

No Action Detail

1



2



3



4


The polarity indication test must be conducted using an approved volt stick . The volt stick must be proved operational by testing on the live supply. Indication of polarity must be conducted at: Incoming cut out fuse Cut out to meter live cable Outgoing live tail to customers installation All neutral cables must be tested for zero voltage


5

Power down

The customer must be asked to power down their appliances before the main switch is turned off. (Please note that there may be a number of Main Switches to turn off on these installations) Note the main switch positions as some switches may already be in the OFF position and must remain in the OFF position on re energisation.

6

Remove the main fuse (Insulated gloves and eye protection must be worn)



7

Confirm polarity at the cut out with the main fuse carrier removed

Using an approved volt stick confirm the polarity on the incoming live terminal of the cut out.

Note: If the volt stick fails, use approved neon testoscope. The incoming live terminal must then be shrouded (where practicable)

8


Remove meter terminal cover and prove the meter dead using an approved test lamp ; the lamp must be proved before and after the test either using the proving unit supplied with the test lamp or on a known live supply. Special consideration must be given to the possibility of back feeds via a generator, wind turbine, solar panels etc

9


Incoming and outgoing tails to be marked with one marker, both live

and neutral. Off peak circuits must be identified with 2 markers.


10


Ensure that the correct meter and tariff are being installed as per the job instruction. When working at a multi service position installation with the tails removed from the meter, check for back feeds using a volt stick.5.24

11

Tightness check

Ensure that all terminals are tight including the out-going side of the cut out and neutral block.

12

Glow Test

After the installation of the new meter and with the customer’s main switch in the off position, conduct a Glow Test in accordance with guidance in 4.15 of this COP.

13

Visual inspection

Visually inspect the installation ensuring that cable colours, cable markers and sequence of cables are all correct and that particular attention is made to the specific diagram.


14

Replace terminal covers and re-energise installation ( insulated gloves and eye protection must be worn inserting/removing fuses)

Replace the appropriate terminal covers and install the main fuse into the cut out ensuring that the fuse is inserted into the dead side of the cut out first and then the live contact second where applicable.

15

Polarity indication check for import export metering

The polarity indication test must be conducted using an approved volt stick . The volt stick must be proved operational by testing on the live supply. Indication of polarity must be conducted at: Incoming cut out fuse Cut out to meter live cable Meter to meter live cable Meter to consumers main switch live All neutral cables must be tested for zero voltage If the polarity is reversed at one of the above positions contact a Line Manager immediately.

16

Final visual checks


17


Inform the customer that the installation is to be re energised. Ensure that all main switches are turned back as appropriate ON. Switches that where in the OFF position at the start of the job must remain in the OFF position.

18


Test the same socket on the customer’s installation that was tested in stage 2 of this procedure. The installation must be left in the state of correct polarity. Ask the customer to witness the plug in test .

19




7.13 CHANGING A MULTI PHASE METER TO IMPORT / EXPORT METER WHERE ACCESS IS GAINED

No Action Detail

1



2



3



4


The polarity indication test must be conducted using an approved volt stick . The volt stick must be proved operational by testing on the live supply. Indication of polarity must be conducted at: Incoming cut out fuses Cut out to meter live cables Outgoing live tails to customers installation All neutral cables must be tested for zero voltage If the polarity is reversed at one of the above positions contact a Line

Manager immediately.

5

Power down

The customer must be asked to power down their equipment before the main switch is turned off. Note the main switch positions as some switches may already be in the OFF position and must remain in the OFF position on re-energisation. Ask the customer or their representative if they have a generator that may start after the installation is de-energised.


6

Remove the main fuses (Insulated gloves and eye protection must be worn)

On removal of the main fuses a full assessment of the condition of the fuse carrier’s must be undertaken in accordance with Safe Working Method 7.3

7

Confirm polarity at the cut out with the main fuse carriers removed

Using an approved volt stick confirm the polarity on the incoming live terminals of the cut out. Note: If volt stick fails, use approved neon testoscope The incoming live terminals must then be shrouded (where practicable).

8

Remove terminal cover and Re-energise and confirm the phase sequence (Insulated gloves and eye protection must be worn)

Remove terminal cover, re-energise and confirm the phase sequence at the terminals of the meter using an approved PSI. The phase sequence will be either: Standard ABC – RYB – L1 L2 L3 Non Standard BAC – YRB – L2 L1 L3

9

De-energise and prove dead (Insulated gloves and eye protection must be worn)

Prove the meter dead using an approved test lamp ; the lamp must be proved before and after the test either using the proving unit supplied with the test lamp or on a known live supply. Special consideration must be given to the possibility of back feeds via a generator, wind turbine, solar panels Incoming live terminals must be shrouded (where practicable)

Standard Phase Sequence

Non Standard Phase Sequence

Mark the incoming and outgoing tails in pairs using the approved markers L1 L2 L3 N. NB: If the tails cannot be marked while still connected to the meter, they must be marked individually as they are removed from the terminal

Ensure that in this situation that the pairs are identified (incoming and outgoing). Mark the tails across the meter as L1-L3-L2 and N.



Change / install the Import Export meter ensuring that the pairs stay the same sequence on both meters L1 L2 L3 N.

Change / install the Import Export meter ensuring that the pairs stay the same sequence on both meters L1 L2 L3 N.





Conduct a glow test on each phase of the meter in accordance with guidance on 4.15 of this COP.

Conduct a glow test on each phase of the meter in accordance with guidance on 4.15 of this COP.

Conduct a one fuse test on each phase of the meter in accordance with guidance on 4.16 of this COP. (Insulated gloves and eye protection must be worn when removing/inserting fuses)


Re-energise and confirm phase sequence at meter terminals. (Insulated gloves and eye protection must be worn when removing/inserting fuses)

Re-energise and confirm phase sequence at meter terminals and main switch. (Insulated gloves and eye protection must be worn when removing/inserting fuses)

De-energise and replace meter terminal cover. (Insulated gloves and eye protection must be worn when removing/inserting fuses)

De-energise and replace meter terminal cover. (Insulated gloves and eye protection must be worn when removing/inserting fuses)

Final visual checks. Visually inspect the work carried out and confirm that the installation is safe, cables marked and wired correctly.

Final visual checks. Visually inspect the work carried out and confirm that the installation is safe, cables marked and wired correctly.


Re-energise (Insulated gloves and eye protection must be worn when removing/inserting fuses)

Re-energise (Insulated gloves and eye protection must be worn when removing/inserting fuses)



Plug in test at a socket outlet and affix witness label. Test the same socket on the customer’s installation that was tested in stage 2 of this procedure. The installation must be left in the state of correct polarity. Ask the customer to witness the plug in test . Sign and affix the witness label.

Plug in test at a socket outlet and affix witness label. Test the same socket on the customer’s installation that was tested in stage 2 of this procedure. The installation must be left in the state of correct polarity. Ask the customer to witness the plug in test . Sign and affix the witness label.






7.14 INSTALLATION OF SINGLE PHASE WHOLE CURRENT SUB METER

No Action Detail

1

Report to site agent/representative receive Permit to Work if necessary

Report to appropriate person/department on site and receive any induction necessary and or receipt of any safety documentation i.e. Permit to Work. This is a legal Health & Safety requirement and must be adhered to at all times.

2





4

Specific visual inspection of the metering and customers equipment



The polarity indication test must be conducted using an approved volt stick . The volt stick must be proved operational by testing on the live supply. Indication of polarity must be conducted at: Customers Switch Fuse All neutral cables must be tested for zero voltage

If the polarity is reversed contact a Line Manager immediately.

6 Power down at customers switch fuse

The customer must be asked to power down their equipment before the main switch is turned off. Note the main switch positions as some switches may already be in the OFF position and must remain in the OFF position on re-energisation.


7

Isolation at local distribution point of customer’s sub- main cable

The sub main cable feeding the customer’s switch fuse must be isolated and locked off. Any fuses removed must remain in the custardy of the operative through out the job. An appropriate safety notice must be displayed at the main isolator, warning of the work being carried out. On removal of the fuses a full assessment of the condition of the fuses and fuse carrier must be undertaken in accordance with Safe Working Method 7.3

8

Remove fuses from customer’s switch fuse (Insulated gloves and eye protection must be worn)

On removal of the fuses a full assessment of the condition of the fuses and fuse carrier must be undertaken in accordance with Safe Working Method 7.3

9 Proving dead

The incoming and outgoing sides of the customer’s switch fuse must be proven dead using an approved test lamp. Particular notice must be given to the presence of back feeds.

10

Fit meter board, red link and neutral block

Meter Board, Red Link and neutral Block to be fitted as per 5.20 of this Code of Practice

11

Re-termination of Customer’s sub-main cable

Re-terminate customer’s sub-main cable into an insulated enclosure ensuring continuity of earthing arrangements. As per 5.20 of this COP Ensure all cables are identified using approved identification labels

12 Install meter

Meter to be installed as per 5.20 of this Code of Practice

13 Customers earthing

Where the steel wire armours of the sub main or a core of the steel wire armoured cable forms the installation earth, an earth cable must be suitably installed between the insulated enclosure and the customer’s switch fuse to maintain earth continuity of the customer’s installation

14 Visual inspection

Visually inspect the installation ensuring that cable colours, cable markers and sequence of cables are all correct


15 Tightness check

Ensure all terminal connections are tight including:

Red links and neutral block connections Meter terminals Customers switch fuse

16

Re-energise customer’s sub- main

Ensure red links are removed and insulated enclosure lid is fitted. Re-energise customer’s sub main

17

Polarity test at red link

Conduct a Polarity Test in accordance with this code of practice at the red link using an approved volt stick

18

Glow test

After the installation of the new meter and with the customers main switch in the off position, conduct a Glow Test in accordance with guidance in 4.15 of this Code of Practice

19

Replace terminal covers and re-energise installation (insulated gloves and eye protection must be worn when installing /removing fuses)

Replace the meter terminal cover and install the red link into the cut out.

20



Incoming cut out fuse Cut out to meter live cable Meter to consumers main switch live Customers consumer unit All neutral cables must be tested for zero voltage


21

Final visual checks



22



23


Test the same socket on the customer’s installation that was tested in stage 3 of this procedure. The installation must be left in the state of correct polarity. Ask the customer to witness the plug in test.

24




7.15 INSTALLATION OF MULTI PHASE WHOLE CURRENT SUB METER

No Action Detail

1

Report to site agent/representative receive Permit to Work if necessary

Report to appropriate person/department on site and receive any induction necessary and or receipt of any safety documentation i.e. Permit to Work. This is a legal Health & Safety requirement and must be adhered to at all times.





4

Specific visual inspection of the customers equipment



The polarity indication test must be conducted using an approved volt stick. The volt stick must be proved operational by testing on the live supply. Indication of polarity must be conducted at: Customer’s switch fuse All neutral cables must be tested for zero voltage


6 Power down at customers switch fuse



7

Remove fuses from customer’s switch fuse (Insulated gloves and eye protection must be worn)

On removal of the fuses a full assessment of the condition of the fuses and fuse carrier must be undertaken in accordance with Safe Working Method 7.3

8 Phase rotation

A phase rotation test must be carried out at the customer’s switch fuse to establish correct rotation. The customer’s incoming tails must be correctly identified at this stage.

9 Confirm polarity at customer’s switch fuse

Using an approved volt stick confirm the polarity on the incoming live terminals of the switch fuse. The volt stick must be proved operational by testing on the live supply.

10

Isolation at local distribution point of customer’s sub- main cable

The sub main cable feeding the customer’s switch fuse must be isolated and locked off. Any fuses removed must remain in the custardy of the operative throughout the job. An appropriate safety notice must be displayed at the main isolator, warning of the work being carried out On removal of the fuses a full assessment of the condition of the fuses and fuse carrier must be undertaken in accordance with Safe Working Method 7.3

11 Proving dead

The incoming and outgoing sides of the customer’s switch fuse must be proven dead using an approved test lamp. The lamp must be proved before and after the test either using the proving unit supplied with the test lamp or on a known live supply. Particular notice must be given to the presence of back feeds.

12

Fit meter board, red links and neutral block

Meter Board, Red Links and neutral Block to be fitted as per 5.20 of this Code of Practice

13

Re-termination of customer’s sub-main cable

Re-terminate customer’s sub-main cable into an insulated enclosure ensuring continuity of earthing arrangements. As per 5.20 of this COP Ensure all cables are identified using approved identification labels

14 Install meter

Meter to be installed as per 5.20 of this Code of Practice


15 Customers earthing

Where the steel wire armours of the sub main or a core of the steel wire armoured cable forms the installation earth, an earth cable must be suitably installed between the suitable enclosure and the customer’s switch fuse to maintain earth continuity of the customer’s installation

16

Carry out insulation resistance testing

Carry out insulation resistance tests between phases and earth, neutral and earth in accordance with BS7671 and document findings.

17


Visually inspect the meter installation ensuring that cable colours, polarity markers and sequence of cables are all correct

18 Ensure all terminals are tight

Ensure all terminal connections are tight including: Red links and neutral block connections Meter terminals

Customers switch fuse

19 Re-energise customer’s sub main

Ensure red links are removed and insulated enclosure lid is fitted. Re-energise customer’s sub main

20

Polarity test at red links

Conduct a Polarity Test in accordance with this code of practice at the red link using an approved volt stick.

21 Glow test

After the installation of the new meter and with the customers main switch in the off position, conduct a Glow Test in accordance with guidance in 4.15 of this Code of Practice

22 One fuse test


23

Re energise and confirm phase sequence at the meter and customers switch fuse

Confirm the phase sequence at the terminals of the meter and customers switch fuse using an approved PSI. The phase sequence MUST be :

Standard e.g. ABC – RYB – L1 L2 L3 -

Customers phase rotation must remain as found.


24

De-energise and replace covers and energise meter

De-energise and replace the red links and seal the meter and red links.



Incoming red link fuse Red link to meter live cable Meter to customers main switch live Customers Main Switch


26

Re-insert fuses in customers switch fuse

Ensure customers switch fuse is in the “OFF” position and replace fuses.

27 Final visual checks


28 Switch on customers main switch

Inform the customer that the installation is to be re energised. Ensure that all main switches are turned back ON. Switches that where in the OFF position at the start of the job must remain in the OFF position.

29

Plug in test at socket outlet and affix witness label

Test the same socket on the customer’s installation that was tested in stage 3 of this procedure. The installation must be left in the state of correct polarity. Ask the customer to witness the plug in test.

30

Operation of customers equipment


31 Seal equipment and leave meter readings

Leave new meter details on appropriate card at the meter position. Seal all equipment and remove any waste materials.

32 Report egress from site

Report to appropriate person/department, cancel any Permit to Work that has been issued and inform of departure from site.


7.16 INSTALLATION OF CHECK METERS

No Action Detail



2



3




The polarity indication test must be conducted using an approved volt stick . The volt stick must be proved operational by testing on the live supply. Indication of polarity must be conducted at: Incoming cut out fuse Cut out to meter live cable Outgoing live tail to customers installation All neutral cables must be tested for zero voltage


5 Power down

The customer must be asked to power down their appliances before the main switch is turned off. Note the main switch positions as some switches may already be in the OFF position and must remain in the OFF position on re energisation.


Single Phase Multi Phase Remove the main fuse (Insulated gloves and eye protection must be worn) On removal of the main fuse a full risk assessment of the condition of the fuse carrier must be undertaken in accordance with Safe Working Method 7.3

Remove the main fuses (Insulated gloves and eye protection must be worn) On removal of the main fuses a full risk assessment of the condition of the fuse carriers must be undertaken in accordance with Safe Working Method 7.3

Confirm polarity at the cut out with main fuse carrier removed Using an approved volt stick confirm the polarity on the incoming live terminal of the cut out. Note: If volt stick fails, use approved neon testoscope. The incoming live terminal must then be shrouded (where practicable).

Confirm polarity at the cut out with main fuse carriers removed Using an approved volt stick confirm the polarity on the incoming live terminals of the cut out. Note: If volt stick fails, use approved neon testoscope. The incoming live terminals must then be shrouded (where practicable).

Where possible do not remove the existing meter terminal cover. If the existing tails between the cut out and meter are too short to reach the check meter position, the existing terminal cover must be removed and the meter proved Dead before changing the tails.

Confirm the phase sequence at the cut out Confirm the phase sequence of cut out using an approved PSI. The phase sequence will be either: Standard e.g. ABC – RYB – L1 L2 L3

Non Standard e.g. BAC – YRB – L2 L1 L3

Prove the supply tails DEAD at the outgoing side of the cut out Prove the outgoing side of the cut out dead using an approved test lamp ; the lamp must be proved before and after the test either using the proving unit supplied with the test lamp or on a known live supply.

Prove the supply tails DEAD at the outgoing side of the cut out Prove the outgoing side of the cut out dead using an approved test lamp ; the lamp must be proved before and after the test either using the proving unit supplied with the test lamp or on a known live supply.


Apply permanent polarity markers Meter tails from the cut out MUST be marked with the appropriate marker, L & N Tails should be marked before removing them from the cut out. NB: If the tails cannot be marked while still connected to the cut out, they must be marked individually as they are removed from the terminals.

Apply permanent polarity markers Meter tails from the cut out MUST be marked with the appropriate marker, L1, L2, L3 & N if multiphase. Tails should be marked before removing them from the cut out. NB: If the tails cannot be marked while still connected to the cut out, they must be marked individually as they are removed from the terminals.

Install new single rate check meter 5,18 Single phase Install the check meter ensuring all terminations are tight If there is any doubt as to the tightness of the tails in the existing meter the terminal cover should be removed and all terminals tightened accordingly.

Install new single rate multi phase check meter 5.19 Multiphase Install the check meter ensuring all terminations are tight and phase rotation is standard.

If there is any doubt as to the tightness of the tails in the existing meter the terminal cover should be removed and all terminals tightened accordingly.

Glow test

Conduct a glow test on the meter in accordance with guidance 4.15 of this Code of Practice Caution – The test lamp will glow slightly brighter due to two meters being in series.

Glow test

Conduct a glow test of each phase of the meter in accordance with guidance 4.15 of this Code of Practice Caution – The test lamp will glow slightly brighter due to two meters being in series.

One fuse test Insulated gloves and eye protection must be worn Conduct a one fuse test on each phase of the meter in accordance with guidance in 4.16 of this COP

Re-energise and confirm the phase sequence (Insulated gloves and eye protection must be worn) Confirm the phase sequence of the check meter using an approved PSI.


De-energise installation (Insulated gloves and eye protection must be worn)

Remove fuses and replace the appropriate terminal covers, where removed.

Visual inspection Visually inspect the installation ensuring that cable colours, cable markers and sequence of cables are all correct.


Re-energise installation (Insulated gloves and eye protection must be worn) Replace all terminal covers and install the main fuse into the cut out ensuring that the fuse is inserted into the dead side of the cut out first and then the live contact second where applicable.

Re-energise installation (Insulated gloves and eye protection must be worn) Insert the main fuse/s into the cut out ensuring that the fuse is inserted into the dead side of the cut out first and then the live contact second where applicable.

Polarity indication check The polarity indication test must be conducted using an approved volt stick . The volt stick must be proved operational by testing on the live supply. Indication of polarity must be conducted at: Incoming cut out fuse Cut out to check meter live cable Check meter to existing meter live cable Meter to consumers main switch live cable All neutral cables must be tested for zero

voltage If the polarity is reversed at one of the above positions contact a Line Manager immediately.

Polarity indication check The polarity indication test must be conducted using an approved volt stick . The volt stick must be proved operational by testing on the live supply. Indication of polarity must be conducted at: Incoming cut out fuses Cut out to check meter to existing meter live cable Meter to consumers main switch live All neutral cables must be tested for zero voltage



Final visual checks



Switch on customers main switch Inform the customer that the installation is to be re energised. Ensure that all main switches are turned back ON. Switches that where in the OFF position at the start of the job must remain in the OFF position.


Plug in test at a socket outlet and affix witness label Test the same socket on the customer’s installation that was tested in stage 2 of this procedure. The installation must be left in the state of correct polarity. Ask the customer to witness the plug in test.



Seal equipment and leave meter readings Leave the existing meter and check meter details on the appropriate form at the meter position. Seal all equipment and remove any waste material.

Seal equipment and leave meter readings Leave the existing meter and check meter details on the appropriate form at the meter position. Seal all equipment and remove any waste material.


7.17 REMOVAL OF CHECK METERS

No Action Detail





3




The polarity indication test must be conducted using an approved volt stick . The volt stick must be proved operational by testing on the live supply. Indication of polarity must be conducted at: Incoming cut out fuse Cut out to check meter live cable/s check meter to existing meter

live cable/s Outgoing live tail to customers installation All neutral cables must be tested for zero voltage


5 Power down

The customer must be asked to power down their appliances before the main switch is turned off. Note the main switch positions as some switches may already be in the OFF position and must remain in the OFF position on re energisation.


Single Phase Multi Phase Remove the main fuse (Insulated gloves and eye protection must be worn) Before the main fuse is removed a full assessment of the condition of the fuse carrier must be undertaken in accordance with Safe Working Method 7.3.

Remove the main fuses (Insulated gloves and eye protection must be worn) Before the main fuses are removed a full assessment of the condition of the fuse carrier must be undertaken in accordance with Safe Working Method 7.3.

Confirm polarity at the cut out with main fuse carrier removed Using an approved volt stick confirm the polarity on the incoming live terminal of the cut out. Note: If volt stick fails, use approved neon testoscope. The incoming live terminal must then be shrouded (where practicable).

Confirm polarity at the cut out with main fuse carriers removed Using an approved volt stick confirm the polarity on the incoming live terminal of the cut out. Note: If volt stick fails, use approved neon testoscope. The incoming live terminal must then be shrouded (where practicable).

Re-energise and confirm the phase sequence (Insulated gloves and eye protection must be worn) Confirm and record the phase sequence of

existing meter using an approved PSI. The phase sequence will be either:

Standard e.g. ABC – RYB – L1 L2 L3 Non Standard e.g. BAC – YRB – L2 L1 L3

Where this is found to be non-standard on the

existing meter the wiring should be corrected to provide standard rotation at the meter terminals without affecting the customers phase rotation.


Remove terminal covers and prove meters dead (Insulated gloves and eye protection must be worn) Remove all terminal covers and prove dead using an approved test lamp ; the lamp must be proved before and after the test either using the proving unit supplied with the test lamp or on a known live supply.

De-energise and prove DEAD (Insulated gloves and eye protection must be worn) Remove fuse/s and all terminal covers and prove dead using an approved test lamp ; the lamp must be proved before and after the test either using the proving unit supplied with the test lamp or on a known live supply.

Remove the check meter Remove check meter and reconnect existing meter to the cut out

Remove the check meter Remove check meter and reconnect existing meter to the cut out

Tightness check Ensure all terminals are tight including out going side of cut out and any auxiliary equipment existing or replaced meter

Tightness check

Ensure all terminals are tight including out going side of cut out and any auxiliary equipment existing or replaced meter

Visual inspection Visually inspect the installation ensuring that cable colours, cable markers and sequence of cables are all correct


. Glow test

With the existing meter connected, or a replacement if found to be faulty, and the customer’s main switch in the off position, conduct a Glow Test in accordance with guidance in 4.15 of this COP. On all phases where applicable

Glow test

With the existing meter connected, or a replacement if found to be faulty, and the customer’s main switch in the off position, conduct a Glow Test in accordance with guidance in 4.15 of this COP. On all phases where applicable

One fuse test (Multiphase only) (Insulated gloves and eye protection must be worn)

Conduct a one fuse test on each phase of the meter in accordance with guidance in 4.16 of this COP


Re-energise installation (Insulated gloves and eye protection must be worn) Replace the appropriate terminal covers and install the main fuse into the cut out ensuring that the fuse is inserted into the dead side of the cut out first and then the live contact second where applicable.

Re-energise and confirm the phase sequence (Multiphase only) (Insulated gloves and eye protection must be worn)

Confirm the phase sequence of the existing

or replaced meter using an approved PSI.

Phase rotation MUST be checked at the customer’s main switch to ensure rotation is as found on arrival at site. If this is not the case then rotation has not been corrected at the meter correctly.

Further investigation will need to be done.

De-energise installation (Insulated gloves and eye protection must be worn)

Remove fuses and replace the terminal cover.


Insert the main fuse/s into the cut out ensuring that the fuse is inserted into the dead side of the cut out first and then the live contact second where applicable.


The polarity indication test must be conducted using an approved volt stick . The volt stick must be proved operational by testing on the live supply. Indication of polarity must be conducted at: Incoming cut out fuse/s Cut out to meter live cable Meter to consumers main switch live All neutral cables must be tested for zero



The polarity indication test must be conducted using an approved volt stick . The volt stick must be proved operational by testing on the live supply. Indication of polarity must be conducted at: Incoming cut out fuse/s Cut out to meter live cable Meter to consumers main switch live All neutral cables must be tested for zero voltage







Check customers equipment (multiphase only)

Ask customer to check any multi phase machinery on site is working correctly



Seal equipment and meter readings Leave the existing meter and check meter details on the appropriate card at the meter position. Seal all equipment and remove any waste material.

Seal equipment and meter readings Leave the existing meter and check meter details on the appropriate card at the meter position.

Seal all equipment and remove any waste material.


7.18 DE-ENERISATION AND REMOVAL OF METERING EQUIPMENT

1



2 Plug in test at socket outlet (If property is energised)


3 Specific visual inspection of the meter position






Part Removal Full Removal

Identification of cables where part removal of equipment is required

Where neutral cables are to be removed from a redundant part of the installation e.g. Off Peak equipment no longer required, great care must be taken to trace the redundant neutral cables back to their source.

If this cannot be confirmed visually, it must be verified electrically by using an approved test lamp.

Power down The customer must be asked to power down their equipment before the main switch is turned off. Note the main switch positions as some switches may already be in the OFF position and must remain in the OFF position on re-energisation.


Power down


Remove the main fuse/s (insulated gloves and eye protection must be worn)

On removal of the main fuse a full assessment of the condition of the fuse carrier must be undertaken in accordance with Safe Working Method 7.3.

Remove the main fuse/s (insulated gloves and eye protection must be worn) On removal of the main fuse a full assessment of the condition of the fuse carrier must be undertaken in accordance with Safe Working Method 7.3.

Confirm polarity at the cut out with main fuses removed Using an approved volt stick confirm the polarity on the incoming live terminal of the cut out. Note: If volt stick fails, use approved neon testoscope. The incoming live terminal must then be shrouded (where practicable).

Confirm polarity at the cut out with main fuses removed Using an approved volt stick confirm the polarity on the incoming live terminal of the cut out. Note: If volt stick fails, use approved neon testoscope. The incoming live terminal must then be shrouded (where practicable).

Remove terminal covers and prove meter dead Remove meter terminal cover’s and prove the meter dead using an approved test lamp ; the lamp must be proved before and after the test either using the proving unit supplied with the test lamp or on a known live supply.

Remove terminal covers and prove meter dead Remove meter terminal cover’s and prove the meter dead using an approved test lamp ; the lamp must be proved before and after the test either using the proving unit supplied with the test lamp or on a known live supply.

Remove all metering equipment and cables


Redundant meter tails and associated equipment All redundant meter tails and associated equipment shall be removed. Plastic bungs will be fitted into any live and neutral spare terminal holes.

Blank off all holes and remove fuse/s from carrier/s All redundant meter tails and associated equipment shall be removed. Plastic bungs will be fitted into any live and neutral spare terminal holes. Fuses must be removed from fuse carriers on all idle services where practicable. Cut outs must be sealed top and bottom.

Tightness check Ensure that all terminals are tight including the out-going side of the cut out and neutral block and other associated equipment terminals

Visual inspections Visually inspect the installation ensuring that cable colours, cable markers and sequence of cables are all correct.

Glow test

After the removal of equipment and with the customer’s main switch in the off position, conduct a Glow Test in accordance with guidance in 4.15 of this COP.

Refit fuse carrier/s and seal cut out

Visual inspections Visually inspect the installation ensuring that cable colours, cable markers and sequence of cables are all correct.

Fit appropriate labels and warning tape Leave the old meter details on the appropriate card at the meter position. Seal all equipment and remove any waste material. Apply warning tape as appropriate.

Replace terminal covers and re-energise Replace the terminal covers and install the main fuse into the cut out ensuring that the fuse is inserted into the dead side of the cut out first and then the live contact second where applicable.

Informin g AIRl ine or Distribution Network Operator Where the redundant service and cut out require urgent removal or are deemed unsafe, AIRline/DNO must be informed immediately.


Polarity indication check The polarity indication test must be conducted using an approved volt stick . The volt stick must be proved operational by testing on the live supply. Indication of polarity must be conducted at:

Incoming cut out fuse Cut out to meter live cable Meter to consumers main switch live All neutral cables must be tested for zero


Final visual checks




Plug in test

Test the same socket on the customer’s installation that was tested in stage 2 of this procedure. The installation must be left in the state of correct polarity. Ask the customer to witness the plug in test. .

Labelling Leave the old and new meter details on the appropriate card at the meter position. Seal all equipment and remove any waste material.


7.19 GAS ESCAPE PROCEDURE (DOMESTIC)

No Action Detail

1

Turn off gas supply

Turn off gas supply at the Emergency Control Valve.

2 Instruct the occupier

To extinguish all sources of ignition and naked flames. No to operate any electrical switches or appliances.

Ventilate the immediate area by opening doors/windows.

3

Use of mobile phone

Do not use your mobile phone, MDT or HHU in the affected area.

4

Evacuation from property

Only evacuate the property where: Occupant safety is at risk.

Persons are overcome by gas or products of combustion.

5 Contact National Grid

Contact NATIONAL GRID on 0800 111 999 and give the following details: Controlled or uncontrolled gas escape. Name, address and postcode of customer. Your name and contact number. When the smell was first noticed and location. Is the Emergency Control Valve off? Any other properties affected. Is there a smell of gas outside the property? Give any extra information that may be relevant.

Ask for a Reference Number for your records.

6

Record reference number on card

Write the Reference Number on the ‘Notification of Gas Escape’ card.

Attach the card to the Emergency Control Valve.

7

Inform the occupier

Inform the occupier or responsible person, that the gas supply can only be restored by a NATIONAL GRID Engineer and that they will require immediate access even if the meter is outside the property.

8

Notify AIRline

Inform AIRline on 0800 092 1361


Section 8

Safe Working Methods CT Operated Metering


8.1 Installation and replacement of GSM modems

8.2 LV CT Operated Meter Install or Change to Panel Only

8.3 Installation of LV CT Chamber / Cabinet and CT’s

8.4 Installation of LV metering terminal (T) box

8.5 Installation of HV metering terminal (T) box

8.6 HV CT Operated Meter Install or Change to Panel Only

8.7 COP 4 Testing of HV AND LV Meters

8.8 Installation of Half Hourly Sub-Meter


8.1 INSTALLATION OR REPLACEMENT OF GSM MODEMS

No Action Detail

1

Report to Site Agent/

Representative

Report to appropriate person/department on site and receive any induction necessary and or receipt of any safety documentation. This is a legal Health & Safety requirement and must be adhered to at all times.

2

Carry out risk assessment

Carry out visual Risk Assessment of Access/Egress to meter position. Carry out visual Risk Assessment of metering equipment and Environment.

3

Check signal Test for adequate GSM signal strength.

4

Install aerial Install aerial in a suitable location and to maximise the signal strength.

5

Install aerial cable Neatly install and fix aerial cable to modem location.

6

Connect modem

If GSM Modem requires separate power supply, isolate Metering Fuses, Install and connect Modem Power supply including discriminatory fusing, Re-energise Meter and Modem Power Supply

7

Check modem

Once suitable signal strength obtained test dial from MDT or if in doubt call dial up team for download of Meter Data to confirm operation of GSM Modem.

8

Record readings

Take manual meter readings and reseal metering against illegal interference.

9

Good housekeeping

Remove any rubbish/waste materials that Siemens are responsible for in accordance with OS environmental procedures.

10

Report egress from site

Report to appropriate person/department and inform of departure from site.


8.2 LV CT OPERATED METER INSTALL OR CHANGE TO PANEL ONLY

No Action Detail

1


Representative


2



3

Capture meter data on change only

HH - Obtain remote download of any existing meters stored data by Data Collector. NHH – Take and record all meter readings

4

Check operation of existing metering

Ensure that existing meter and associated equipment is functioning correctly.

5

Confirm and record site CT details

Confirm and record CT Details, ensure CT Burdens are not exceeded.

6

Isolate metering equipment where meter to be changed

Isolate metering system by removing metering fuses and shorting CT Links.

7

Proving dead at meter test terminal block

Prove Voltage Terminals to be dead using approved test lamp. The operation of the test lamp must be proved before and after test. Confirm visually that CT’s are shorted out.

8

Install/change metering equipment

Remove old meter and communications equipment where necessary and install new meter and communications equipment.


9

Carry out visual wiring checks.

Ensure that all cables are identified in accordance with the MOCOPA agreement and are in good condition.

10

Re-energise metering equipment

Replace Metering fuses to re-energise metering, checking phase failure indication is working.

11

Check correct operation of meter

Remove shorting links from CT’s individually confirming correct operation of meter.

12

Commission new metering equipment

Commission metering system as per this Code of Practice to prove correct operation and communications.

13

Protection against direct contact

Blank off any redundant holes and slots to protect against direct contact with exposed live parts.


8.3 INSTALLATION OF LV CT CHAMBER/CABINET AND CT’s

No Action Detail

1

Report to Site Agent/ Representative


2


Carry out visual Risk Assessment of Access/Egress to meter position. In accordance with Safe Working Method 7.1

3

Specific risk assessment

Carry out visual Risk Assessment of metering equipment and surrounding environment. In accordance with Safe Working Method 7.2 Check customer’s main tails for size and suitability.

4

Remove the Main Fuse carriers. (Insulated gloves and eye protection must be worn)

On removal of the main fuses a full assessment of the condition of the fuse carrier’s must be undertaken in accordance with Safe Working Method 7.3. If shrouds are on the prongs of the cut out ensure they are correctly installed.

5

Confirm Polarity at the Cut Out with main fuse carrier removed

Using an approved volt stick confirm the polarity on the incoming live terminals of the cut out.


6

Confirm Supply at the Cut Out. (phase to phase and phase to neutral)

Prove the supply at the cut out using an approved test lamp; must be proved before and after the test either using the proving unit supplied with the test lamp or on a known live supply.

7

Confirm Phase Sequence at the Cut Out

Using an approved Phase Sequence Indicator (PSI), confirm the phase sequence of the incoming live terminals of the cut out.


8

Earth Loop Impedance (ELZ)

Confirm ELZ at cut out complies with DNO requirements, (Where applicable).

9


Fit appropriate shrouds in cut out wearing LV gloves. Replace cut out cover if necessary to prevent contamination while installing chamber/cabinet.

10

Fix CT chamber/cabinet

Fix CT chamber securely above service head.

11

Fix CT’s and connect

Fix CT’s securely in chamber and in correct direction for energy flow. Size CT’s as appropriate for declared load. Connect secondary wiring applying approved cable identification. If service not ‘live’ connect CT’s as ‘standard’ rotation.

12

Fit and connect meter supply cables

Connect 10 mm meter supply cables between service head and metering back up fuses. If service not ‘live’ connect CT’s as ‘standard’ rotation.

13

Earth cabinet and connect customers earth if appropriate

Fix and connect supplementary bonding from the cabinet to the earthing terminal on service head. Connect customer’s main earth to earthing terminal in accordance with current PME requirements.

14

Insulation resistance test on customer’s tails

With customer’s main switch in the off position and tails disconnected from the cut out, confirm the insulation resistance between phases and earth and neutral and earth and between phases (in accordance with BS7671).

15

Connect customer’s main tails.

Connect tails to service head. If service not ‘live’ connect as ‘standard’ rotation.


16

Check phase barriers.

Check that all service head and CT chamber barriers and panels have been re-fitted correctly.

17

Energise supply (where meter is to be fitted as per 8.2)

Confirm that fuses are correct size and insert fuse carriers wearing insulated LV gloves and eye protection (and additional PPE, where appropriate).

18

If supply is not provided or where meter is NOT fitted.

Leave links in closed position and ALL fuses removed from fuse carriers

19

Seal chamber and service head.

Ensure that CT chamber and service head are sealed against illegal interference

20

Good housekeeping.

Remove any rubbish/waste that Siemens are responsible for in accordance with OS Environmental Procedures.

21

Report to Site Agent/Representative before leaving site



8.4 INSTALLATION OF LV METERING TERMINAL (T) BOX

No Action Detail

1

Report to Site Agent/Representative


2



3


Carry out visual Risk Assessment of metering equipment and surrounding environment. In accordance with Safe Working Method 7.2

4

Carry out essential tests at supply cubicle

Using an approved volt stick confirm correct polarity on inside of supply cubicle. Confirm three phases and neutral present at supply cubicle, using an approved test lamp. The operation of the test lamp must be proved before and after test. Determine standard phase sequence using approved PSI. Confirm ELZ at supply cubicle complies with distribution requirements. (where applicable)

5

Proving dead

Before any work commences in the cubicle, prove the bus bars are dead using an approved test lamp. The operation of the test lamp must be proved before and after test. Lock off MCB where applicable and apply appropriate warning signs.

6

Fix LV ‘T’ box

Mount LV ‘T’ box at a suitable location taking in to account maximum length of cable allowed. Care must be taken when drilling holes to ensure that waste does not fall into cut out/wiring. Clear any debris from inside of cabinet.

7

Install pilot cable.

Install multi-core pilot cable between supply cubicle and ‘T’ box along route agreed with customer.


8

Mark and connect pilot cables

Mark and connect cables in accordance with MOCOPA agreement.

9

Note site details Note all CT details from site.

10

Seal equipment

Seal ‘T’ box and supply cubicle against illegal interference.

11

Energise supply upon request (where meter is fitted as per 8.2)

Where safe to do so, the supply will be energised up to the customer’s main switch.

12 Good housekeeping Remove any rubbish/waste materials that Siemens are responsible for in accordance with OS Environmental Procedures.

13




8.5 INSTALLATION OF HV METERING TERMINAL (T) BOX

No Action Detail

1



2



3


Carry out visual Risk Assessment of metering equipment and surrounding environment. In accordance with Safe Working Method 7.2

4

Carry out essential tests at test block

Using an approved volt stick confirm correct polarity at the test block. Confirm supply is present at test block, using an approved test lamp. The operation of the test lamp must be proved before and after test. Determine standard phase sequence using approved PSI.

5

Proving dead

Before any work commences in the cubicle, prove the bus bars are dead using an approved test lamp. The operation of the test lamp must be proved before and after test. Lock off MCB where applicable and apply appropriate warning signs.

6

Fix HV ‘T’ box

Mount HV ‘T’ box at a suitable location taking in to account maximum length of cable allowed. When drilling holes ensure that internal barriers are in position. Clear any debris from inside of cabinet.

6

Install pilot cable.

Install multi-core pilot cable between supply cubicle and ‘T’ box along route agreed with customer.


7

Connect pilot cable

Gland off and connect pilot cable. Mark cables in accordance with MOCOPA agreement.

8

Note site details

Note all CT and VT details from site.

9 Seal equipment

Seal ‘T’ box and supply cubicle against illegal interference.

10

Good housekeeping

Remove any rubbish/waste materials that Siemens are responsible for in accordance with OS Environmental Procedures.

11




8.6 HV CT OPERATED METER INSTALL OR CHANGE TO PANEL ONLY

No Action Detail

1



2


Carry out visual Risk Assessment of Access/Egress to meter position. 7.1 Carry out visual Risk Assessment of metering equipment and Environment. 7.2

3

Capture meter data

Obtain remote download of any existing meters stored data by Data Collector.

4

Preliminary checks

Carry Out preliminary checks on existing metering equipment including Voltage checks, Earthing checks, Phase Rotation and take final readings from any meters to be replaced.

5

Confirm and record site details

Confirm and record VT/CT Details, Ensure VT and CT Burdens are not exceeded.

6

Isolate metering equipment

Isolate Metering system by removing metering fuses and shorting CT Links.

7


Prove Voltage Terminals to be dead using approved test lamp. The operation of the test lamp must be proved before and after test. Confirm visually that CT’s are shorted out.

8

Install/change metering equipment

Remove old meter and communications equipment where necessary and Install new Meter and communications equipment.

9

Carry out visual wiring checks.

Ensure that all cables are identified in accordance with the MOCOPA agreement and are in good condition.


10


Replace Metering fuses to re-energise metering, checking Phase failure indication is working.

11



12


Commission Metering system as per this Code of Practice to prove correct operation and communications.

13


Blank off any redundant holes and slots to protect against direct contact with exposed live parts. Seal all metering and associated equipment against illegal interference.

14

Good housekeeping

Remove any rubbish/waste materials that Siemens are responsible for in line with OS environmental procedures.

15




8.7 COP 4 TESTING OF HV AND LV METERS

No Action Detail

1



2



3

Specific Risk Assessment


4

Capture meter data

Obtain remote download of any existing meters stored data by Data Collector.

Record readings

5

Check operation of existing metering

Ensure that existing meter and associated equipment is functioning correctly.

6

Confirm site details

Confirm and record meter and CT/VT Details.

7

Isolate metering equipment

Isolate metering system by removing metering fuses.

Short out CT’s by closing links

8


Prove voltage terminals to be dead using approved test lamp. The operation of the test lamp must be proved before and after test.

Confirm visually that CT’s are shorted out.


9

Connect test equipment

Connect COP4 test equipment and injection kit if required.

10 Test meter

Complete COP4 tests.

11

De-energise metering equipment and disconnect test equipment

Remove metering fuses and close CT links to enable safe disconnection of test equipment.

12


Replace metering fuses and open CT links to restore meter to normal running.

13

Commission metering equipment

Commission metering system to prove correct operation.

14 Seal all equipment Reseal all metering and associated equipment against illegal interference.

15

Good housekeeping

Remove any rubbish from site.

16

Report to Site Agent/Representative before leaving site



8.8 INSTALLATION OF HALF HOURLY SUB METER

No Action Detail

1


Representative


2



3

Fix meter cabinet chamber and meter

Fix meter cabinet and meter securely, adjacent to customers switch fuse.

4

Carry out essential tests at sub main isolator

Using Testoscope confirm correct polarity on sub main isolator Confirm three phases and neutral present, using test lamp (prove before and after use) Determine standard phase rotation using PSI (Indicator). Confirm ELZ complies with distribution requirements.

5

Isolation

The customer’s isolator must be switched off and access gained to the customers fuses and incoming cable tails.

6

Fix C/T’s and connect

Fix C/T’s securely over cable tails inside customers switch fuse. Size C/T’s as appropriate for declared load. Connect secondary wiring checking for approved cable identification.

7

Fit and connect meter supply cables

Connect meter supply cables between incoming terminals of customer switch and metering back up fuses.

8

Check phase barriers.

Check that all C/T chamber barriers and panels have been re-fitted correctly.

9

Energise supply (where meter is fitted)

Confirm that fuses are correct size and insert fuse carriers wearing LV gloves (and additional PPE, where appropriate).


11



12


Commission metering system as per this Code of Practice to prove correct operation and communications.

10

Seal meter and meter cabinet.


11

Good housekeeping.

Remove any rubbish/waste that Siemens are responsible for in accordance with OS environmental procedures.

12




APPENDIX 1 (Appendix 11 of the MOCOPA)

IMPACT OF EU HARMONISATION OF CABLE COLOURS

This Appendix commenced from 1st January 2005

A11.1 For whole current metering, load-carrying conductors shall be marked either L and

N for single phase supplies, or L1, L2, L3 and N for multi phase supplies, whenever metering work is carried out. The markings shall be applied as a minimum:

a) at the meter terminals (except the incoming terminals where security devices are fitted); and

b) at any equipment fitted by a Meter Operator, Distribution Business or UMetS provider on the outgoing side of the meter which interfaces to the customer’s installation (eg isolation/supply switch, timeswitch, terminal blocks).

The markings may be by printed tape, tag or other suitable permanent medium.

A11.2 The Meter Operator shall only connect a new customer’s circuit provided it is

clearly and unambiguously identified at the end to be connected, either by colour or marking (eg L, L1, L2, L3, N), in accordance with the current version of BS 7671.

A11.3 Meter Operators, Distribution Businesses and UMetS providers will adopt the new

conductor colours for load carrying conductors they provide for all new and replacement wiring. For avoidance of doubt, the insulation of multi phase conductors may be either

a. all brown (but marked L1, L2, L3 at both ends*) or b. brown, black and grey (and additionally marked in accordance with 1).

(*for conductors of less than 500mm in length and visible throughout, marking at one end may be considered acceptable) All neutral conductors shall have blue insulation and marked N in accordance with 1.

A11.4 For avoidance of doubt, the outer sheath may be any colour. This may include grey. It is recommended that only one outer sheath colour is used for new and replacement cables for both phase and neutral conductors.

A11.5 Distribution Businesses adopt the BEBS 12 standard ferruling marking at the

interface (test terminal block and/or fuses/link) for all new and altered wiring. At the Distribution Business terminations, the markings shall be: CTs: D11, D10, D31, D30, D51, D50 (odd is “feed”)


(Where a common return is used, then D10, D30, D50 become D70) Metering Potentials:

E10 or E11, E30 or E31, E50 or E51 (depending on whether the interface is the fuse/link or the test terminal block after the fuse).

A11.6 Distribution Business CT metering secondary voltage and current conductors shall

be either: a) all one colour; or b) brown, black, grey (phase colours) and blue (neutral).

all one colour for all new and altered wiring.

A11.7 Meter Operators shall adopt the BEBS 12 ferruling marking for all new and altered

CT metering wiring, and all CT metering secondary voltage and current conductors shall be:

a) all one colour; or b) Brown, black, grey (phase colours) and blue (neutral).

For avoidance of doubt, this may be a different colour to that provided by the Distribution Business. Auxiliary wiring (eg pulse, rate change and communications signals) does not need to conform, but should be suitably identified. For clarity, the BEBS12 requirements in A11.5 and A11.7 secure a clear identification of the different conductors and should be adopted as best practice for identification.


APPENDIX 2

DOOR STEP PROTOCOL

It is very important to ensure that all Company Field Staff adhere to the National Doorstep Protocol and conduct themselves in the correct manner when working at customers’ premises.

Staff must always display their identity card.

Staff must always be friendly, courteous, sensitive to the customer’s needs and be non-threatening.

Staff must be of smart appearance and wearing the current branded uniform.

Vehicles must be clean and tidy and in a presentable condition.

Any password held on record shall be quoted on arrival at customer’s premises.

Staff must introduce themselves to the customer in the following manner:

Staff must offer their ID card for verification by the customer and display it at all times.

Good morning/ afternoon/ evening Customers’ Name (where practicable)

Your name from Siemens Operational Services providing metering services for (Supplier’s Details eg, British Gas, EDF etc)

Here to carry out (give a job description) on their behalf

Give an indication of the length of time the job will take to complete.


Staff must verify the customer’s name, address and supplier. If details are different then the correct information must be documented in the “Operatives Remarks” on the MDT.

Staff must invite the customer to power down appliances and equipment and advise that the supply will be interrupted.

Staff must ensure adequate precautions are taken to protect customer’s property.

Accidental damage caused to a customer’s property must be reported to AIRLine/ Area Manager immediately. The operative must make every effort to resolve the issue whilst on site.

Staff must not smoke, drink alcohol or take drugs on the customer’s premises.

Staff must demonstrate the operation of the metering equipment, i.e. Prepayment Meters.

Staff must allow extra time to demonstrate prepayment meters to elderly and disabled customers. If the customer is deaf then staff should talk to the consumer “face to face” as they maybe able to lip-read.

Staff must ensure that the Disability Discrimination Act 1995 and any subsequent amendments are adhered to at all times.

Staff must be mindful at all times of their duties under the Health and Safety at Work etc Act 1974.

All information must be treated as confidential as defined under the Data Protection Act 1995.

Staff must not give tariff advice or compare Suppliers in any way.


APPENDIX 3

MANAGEMENT OF METER STOCKS WITHIN THE FIELD

It shall be the Operatives responsibility to ensure that all off circuit meters / associated equipment are returned to the local storage location or reused as per contractual requirements (as in agreed certification time). Any faulty metering equipment must be identified with the appropriate fault label and returned to the appropriate storage location.

Meters must be segregated in the vehicle and storage locations so that they can be easily identified in relationship to the asset owner and to allow stock rotation to take place.

Consideration must be given to staff that are not installing meters for long periods of time. Meters must be returned so they are available for installation by other Operatives.

It remains the Operatives responsibility to maintain correct vehicle stock levels in line with contractual requirements and company policy. This is to ensure that the correct meter relating to the asset owner is installed in line with the suppliers’ job instructions.

Meters shall be electronically scanned where contractual requirements dictate, from the storage location to the vehicle and from the vehicle to the wall and visa versa where applicable. Off circuit good meters MUST be reused in line with contractual and company requirements.

Non scanned meters must be recorded manually, either via MDT or ECO. Information will be returned for deprogramming.

Documents

METER OPERATIONS CODE OF PRACTICE AND SAFE WORKING … · 2017-09-05 · Multi Head multi-way distribution board, e.g. Ryfield, Bemco, MEM Neutral the conductor which is connected