SP-1111 Temporary Electrical Supplies for Construction & Maintenance Work

Petroleum Development Oman L.L.C.

Electrical Infrastructure

Specification for Temporary Electrical Supply for

Construction and Maintenance Work

User Note:

The requirements of this document are mandatory. Non-compliance shall only be authorised by the Document Owner or his Delegate through STEP-OUT approval.

A controlled copy of the current version of this document is on PDO's EDMS. Before making reference to this document, it is the user's responsibility to ensure that any hard copy, or electronic copy, is current. For assistance, contact the Document Custodian or the Document Controller .

Users are encouraged to participate in the ongoing improvement of this document by providing constructive feedback.

Please familiarise yourself with theDocument Security Classification Definitions

They also apply to this Document!

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UNRESTRICTED Document ID : SP-1111 April 2006 Filing key : Business Control

http://sww3.pdo.shell.om/getdoc?dataid=3966312

mailto:[email protected]?subject=Ref:%20SP-1219,%20Well%20Engineering%20H2S%20Specification

Petroleum Development Oman LLC Versio:4.0Effective: Apr.06

Authorised For Issue April 2006

Page 2 Specification for Temporary Supply for Constr. and Maint. Work

Printed 30/04/06

The controlled version of this CMF Document resides online in Livelink®. Printed copies are UNCONTROLLED.


The following is a brief summary of the 4 most recent revisions to this document. Details of all revisions prior to these are held on file by the issuing department.

Version No. Date Author Scope / RemarksVersion 1.0 Aug 97 BEB/4 General RevisionVersion 2.0 June

99C.V. Raghavan,OIE/11

Converted to Specification as per PDO Policy Cascade

Version 3.0 Oct. 03 O. Nilsson, TTE1X General RevisionVersion 4.0 Apr.06 Saif Al Harthy, UIE/4 Updated applicable standards list and

reformatted


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Contents

1. Introduction..................................................................................4

1.1 PURPOSE..............................................................................................4

1.2 APPLICABLE STANDARDS, REGULATIONS AND ADVISORY LEAFLETS..............................................................................................41.2.1 Equipment Standards............................................................................41.2.2 Installation Standards............................................................................51.2.3 Advisory Leaflets...................................................................................5

1.2.3.1 Health and Safety Executive (UK) Guidance Notes....................51.2.3.2 Construction Industry Training Board (UK).................................5

2 Scope............................................................................................6

2.1 CLASSIFICATION OF TOOLS...............................................................6

2.2 WELDING MACHINES...........................................................................6

2.3 DISTRIBUTION SYSTEM.......................................................................62.3.1 Basis.....................................................................................................62.3.2 Source Of Supply...................................................................................62.3.3 Distribution and Utilisation Voltages.......................................................72.3.4 Supply System for Portable Tools..........................................................7

2.3.4.1 Mains Connected System..........................................................72.3.4.2 Welding set- Connected System................................................7

2.3.5 System Capacity Required.....................................................................82.3.6 System Single-Line Diagram..................................................................8

2.3.6.1 Content and Preparation............................................................82.3.6.2 Component and System Identification........................................82.3.6.3 Additional Data..........................................................................8

2.4 EARTHING.............................................................................................92.4.1 General.................................................................................................92.4.2 Portable Hand-Held Tools System.........................................................9

2.5 EQUIPMENT...........................................................................................92.5.1 Distribution Equipment...........................................................................92.5.2 Plugs, Socket Outlets and Couplers.....................................................102.5.3 Cable...................................................................................................11

2.6 INSTALLATION....................................................................................122.6.1 General...............................................................................................122.6.2 Distribution Equipment Location...........................................................122.6.3 Cables.................................................................................................12

2.6.3.1 Cable Fixing............................................................................122.6.3.2 Cable Termination...................................................................132.6.3.3 Cable Extension......................................................................13

2.6.4 Welding Generators.............................................................................132.6.4.1 Earthed system.......................................................................132.6.4.2 Non Earthed system................................................................13

2.7 TESTING AND INSPECTION...............................................................142.7.1 System Testing....................................................................................142.7.2 Planned Inspection..............................................................................142.7.3 Inspection System...............................................................................15

2.7.3.1 Implementation........................................................................152.7.3.2 Repairs...................................................................................15

2.8 DOCUMENTATION..............................................................................15

FIGURES


FIGURE 1 & 2 - CIRCUITS FOR PORTABLE TOOLS...........................................................16

FIGURE 3 - CIRCUIT FOR EARTHED AUXILLIARY SUPPLY FROM WELDING SETS....17FIGURE 4 - CIRCUTIS FOR NON-EARTHED AUXILLIARY SUPPLY FROM WELDING

SETS.................................................................................................................... 17

APPENDICES

APPENDIX 1 - TYPICAL SINGLE LINE DIAGRAM.............................................................18APPENDIX 2 – ELECTRICAL LOAD ASSESSMENT DATA SHEET....................................19APPENDIX-3 – DCS SYSTEM ELECTRICAL SUPPLIES......................................................20APPENDIX 4 - ANCILLARY ITEMS FOR SUBSTATIONS...................................................21APPENDIX A : GLOSSARY OF DEFINITIONS, TERMS AND ABBREVIATIONS..............23SP USER-COMMENT FORM..................................................................................................24


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1. Introduction

1.1 PURPOSE

This Specification (SP) is for use by all Contractors involved in Site construction work for PDO. It specifies the type of electrical equipment Contractors shall use for the distribution and utilisation of electricity for construction and related purposes on all construction Worksites, and gives guidelines for the safe installation, use and maintenance of this equipment.

This SP does not cover: Supply of camps (refer to SP-1110). Work permit system (refer to GU-273 and PDO HSESM).

1.2 APPLICABLE STANDARDS, REGULATIONS AND ADVISORY LEAFLETS

Equipment shall be manufactured and installed in accordance with the following Standards, but other recognised national and international standards may be acceptable, subject to approval by the Company at the tender stage. Latest editions of the listed standards, with all amendments, shall be used.

1.2.1 Equipment Standards

IEC 60309 Plugs, Socket-Outlets and Couplers for Industrial purposes

IEC 60745 Hand held Motor-Operated Electric Tools - Safety

IEC 60755 General Requirements for Residual Current Operated Protective Devices

IEC 61029 Safety of Transportable Motor-Operated Electric Tools

BS 4363 Specification for Distribution Assemblies for Reduced Low Voltage Electricity Supplies for Construction and Building Sites

IEC 60502 Extruded Solid Dielectric Insulated Power Cables for Rated Voltages from 1 kV up to 30 kV.

DEP 33.64.10.10 –

Clause 4.10.5 Electrical Engineering Guidelines

SP-1103 Amendments/ Supplements to DEP-33.64.10.10-Gen, Engineering Guidelines

IEC 60947-1 Low Voltage Switchgear and Control Gear – Part 1: General Rules

IEC 60245 Rubber Insulated Cables - Rated Voltages up to and Including 450/750 V

CENELEC EN 60694-1 Safety Requirements for Arc Welding Equipment Part 1: Welding Power Sources; (Supersedes HD 24:1973)

BS 638-5:1988 Arc Welding Power Sources, Equipment and Accessories. Specification for Accessories

BS 6708:1991 Flexible Cables for Use at Mines and Quarries


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1.2.2 Installation Standards

SP-1099 Electrical Installation Practice (ERD-63-01 Superseded by SP-1099)

SP-1110 Electrical Supply of Mobile Camps

SP-1109 Earthing and Bonding

DEP 33.64.10.10

Appendix 5 Electrical Engineering Guidelines

IEE Regulations for Electrical Installations

BS 7375 Code of Practice for Distribution of Electricity on Construction and Building Sites

IEC 60364 Parts 3;

4-41; 4-43; 7-704 Electrical Installations of Buildings

1.2.3 Advisory Leaflets

The following documents have been used or referred to in the preparation of this Standard.

1.2.3.1 Health and Safety Executive (UK) Guidance Notes

NGS 6 Avoidance of Danger from Overhead Electric Lines.

NGS 24 Electricity on Construction Sites.

NPM 32 The Safe Use of Portable Electrical Apparatus.

1.2.3.2 Construction Industry Training Board (UK)

Construction Safety Notes Section 20, Electricity.


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2 Scope

2.1 CLASSIFICATION OF TOOLS

Class 1 A tool having at least basic insulation throughout and under certain conditions required to be earthed.

NOTE: Class 1 tools shall not be approved for PDO contracts.

Class 2 A tool with double insulation and/or reinforced insulation throughout and without provision for earthing (IEC 61140).

All class 2 tools of accepted design have the symbol on the nameplate and are often referred to as "Double insulated".

Class 3 A tool designed for operation at safety extra low voltage (IEC 61140).

Safety Extra Low Voltage (SELV)

A nominal voltage not exceeding 42 Volts between conductors and between conductors and earth. No-load voltage not exceeding 50 Volts

2.2 WELDING MACHINES

When engine driven welding generators are equipped with a 240 V auxiliary single phase winding, supplying socket outlets for the use of hand held tools in compliance with Class 2 requirements, the installation shall be fitted with overload and earth fault protection devices as detailed in 2.6.4 and Figures 3 & 4. All sockets outlets shall be mounted on the generator.

2.3 DISTRIBUTION SYSTEM

2.3.1 Basis

The system and equipment described in this Specification are designed to allow safe, efficient, flexible and economic working on construction worksites in all matters relating to the distributing and use of electricity.

Installation of equipment and cables shall be in accordance with the same stringent standards used for permanent installations, with minor exceptions relating to cable supports. Although the installation may be only temporary, the harsh conditions on site require that the standard of installation should be equal to that of the company's permanent installations.

Installation of equipment on a PDO worksite shall allow convenient and safe access to permit authorised and competent operatives to work on apparatus contained within.

2.3.2 Source of Supply

The Contractor shall be responsible for the provision of electrical power in the construction site area. Normally this will be in the form of portable AC generator sets. Where a main supply is available, this requirement may be waived. However, it will be subject to agreement with the Company. Auxiliary socket outlets on welding machines may be used for the supply of hand tools of Class 2.

Metalwork of generating sets shall be bonded to metalwork of the Site distribution system. The star point of a three-phase generating set and the neutral of a single-


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phase generating set shall be included in the above bonding (TN-S system). The bonding then should be effectively earthed. For welding generators refer to 2.6.4.

All generator sets shall be provided with overcurrent and earth-fault protection. The protective apparatus should be capable of interrupting, without damage, any short-circuit current that may occur.

2.3.3 Distribution and Utilisation Voltages

The following voltages shall not be exceeded for each application without prior permission of the company.

TABLE 1 - Utilisation Voltages

EQUIPMENT VOLTAGE

Fixed plant 415 V 3-phase

Moveable plant fed via a trailing cable 415 V 3-phase

or 240 V 1-phase

Installations in Worksite buildings 240 V 1-phase

Fixed flood lighting 240 V 1-phase

Portable and hand-held tools 42 V or 240 V 1-phase

Site lighting (other than floodlighting) 240 V 1-phase

Portable hand-lamps (general use) 42 V 1-phase

Portable hand-lamps (confined and damp situations)

25 V 1-phase

2.3.4 Supply System for Portable Tools

For portable hand-held tools and equipment, the preferred system shall be a Class 3 SELV type. An SELV (42 V) supply shall be derived from a safety isolating transformer (see Figure 2 and Tables 1, 2, 3, 4 and 5).

Portable hand-held tools and equipment shall include, but not be limited to hand lamps, soldering iron, grinders and drills.

When portable hand-held tools of Class 3 are not available, as for example with larger sizes of tools, Class 2 tools may be used.

In the event of Class 2 equipment being offered, the Contractor shall utilise either of the following systems, but shall not employ different systems on the same site.

2.3.4.1 Mains Connected System


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A 240 V piece of Class 2 equipment shall be connected via an earth leakage protection device of maximum 30 mA, protecting both the supply cord and the equipment (Figure 1 and Tables 1, 2, 3, 4 and 5).

The equipment shall confirm to IEC 60745 and IEC 61029.

2.3.4.2 Welding Set Connected System

A 240 V piece of Class 2 equipment shall be connected to the auxiliary single phase socket outlet of the welding machine. The welding machine shall be wired as outlined in 2.6.4.


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2.3.5 System Capacity Required

The Contractor shall be responsible for determining both peak and average power requirements of electrical equipment to be used during the construction period. This shall include not only equipment directly used in construction but also ancillary services such as site and office lighting, air conditioning, water heaters, etc, and shall include all equipment at all voltages. The assessment shall take account also of motor starting currents to ensure that suitably rated generating equipment has been installed.

The Contractor shall prepare this assessment for approval by the Company prior to mobilisation and shall present it in tabular form with separate columns for each voltage level. A sample is given in Appendix 2.

2.3.6 System Single Line Diagram

2.3.6.1 Content and Preparation

The Contractor shall prepare a single line diagram of his proposed site distribution system, which shall be submitted with the Tender for the construction works. Both single line diagram and distribution system shall be subject of approval by the Company before commencement of work at site. The single line diagram shall be accompanied by a layout drawing showing proposed initial location of all equipment, identified by the use of numbers on the single line diagram. A typical single line diagram is shown in APPENDIX 1, illustrating the principles which shall be followed. The Contractor may vary both rating and number of units, as convenient.

Each single line diagram shall give information on:

- Earthing arrangements.

- Number of Sub-Main Distribution Units (in addition to the Main Distribution Unit).

- Number of Transformer Units.

- Number of Outlet Units.

- All transformer ratings.

- All switch, fuse, MCB and RCD ratings.

- All socket outlet ratings.

- All cable sizes and numbering.

- Fixed lighting rating.

- Office, workshop and similar supplies with ratings.

- All power supplies to fixed equipment at 415 V and 240 V.

2.3.6.2 Component and System Identification

Cable numbers shall be stated for all cables, except those to hand tools or lamps.

Identification numbers shall be stated for all distribution equipment. These numbers shall form part of a rational numbering system and shall be in line with the serial numbers required by the Inspection Record System (see Section 2.7.3).

2.3.6.3 Additional Data

Accompanying the single line diagram, either as a drawing note or as a separate list, the Contractor shall also provide additional information on:

- Manufacturing standards, if different to those quoted in this Specification.

- Manufacturers type and serial numbers of all distribution equipment, preferably with illustrated leaflets.


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- Cable types.

2.4 EARTHING

2.4.1 General

All metalwork of distribution systems and fixed equipment not carrying a current shall be effectively earthed.

Circuit protection conductors shall be installed to provide the return path from each unit of any installation to the main earth terminals.

Equipment operating at 415 V and 240 V shall be earthed in accordance with normal PDO practice.

Earth conductors shall be either 25 mm2 or 70 mm2 copper conductor, depending upon the equipment to be earthed, with green and yellow PVC sheath.

For metal enclosures, all cable armouring shall be securely made-off, using suitable brass compression glands with armour clamping rings, and the glands shall be bonded together. The earthing thus provided by armouring is in addition to the separate earth conductor described above. All armoured cables shall be terminated using double compression cable glands.

Refer SP-1109 Appendix 1 for more information.

2.4.2 Portable Hand Held Tools System

All portable tools and hand lamps conforming to this Specification, being either Class 2 or Class 3, shall not to be earthed.

2.5 EQUIPMENT

2.5.1 Distribution Equipment

Equipment constructed in accordance with BS 4363 shall be used. Equipment manufactured according to other international standards but embodying the principles of BS 4363 may also be used, provided it is approved by the Company. Full details of all distribution equipment to be used shall be submitted with the Tender.

The distribution equipment shall be connected as illustrated in the typical single line drawing in Appendix 1.

Of the equipment described and specified in BS 4363, the only equipment that shall be used is:

- Main Distribution Unit (MDU)

- Transformer Unit (TU)

- Outlet Unit (OU)

- Extension Outlet Unit (EOU)

The principal features of distribution equipment complying with BS 4363 are:

- Robust enclosure.

- Rain proof and dust proof enclosure classification according to IP 54 degree of Protection (reference IEC 60947-1).

- Lifting lugs and handles.


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- Earthing facilities

- Provision for bonding of cable armouring.

- Live parts inaccessible.

- Padlocking facilities on isolators ('OFF' position only).

In addition to the requirements of BS 4363, Residual Current Devices (RCDs) shall be provided on all outgoing circuits from MDU and sub-main distribution units.

NOTE: RCDs are often known as current operated Earth Leakage Circuit Breakers (ELCBs).

Sensitivity of the earth fault cutout device shall be for:

- Circuits up to and including 63 A : 30 mA

- Circuits above 63 A : 100 mA

Equipment identification numbers in accordance with single line diagrams (see Section 2.3.6) shall be clearly and indelibly marked on all equipment.

2.5.2 Plugs, Socket Outlets and Couplers

All plugs, socket outlets and cable-couplers shall conform to the requirements of IEC 60309.

The Contractor shall ensure that cable-couplers, extension leads and the plugs on the end of hand tools, lamps, etc., are equipped with the correct components.

All current-carrying accessories such as plugs, socket outlets and cable-couplers shall be manufactured from robust insulating material, have a degree of protection of IP 54 minimum of IEC 60947-1 and be colour-coded as in Table 2 and 3.

AC OPERATING VOLTAGE

COLOUR

25 Violet

50 White

240 Blue

415 Red

Table 2 - Colour-Coding for Current-Using Accessories

OPERATING VOLTAGE

POLES EARTH PIN POSITION

25 2 None

50 2 None

240, single phase 2 + E 6 h

415, three phase 3 + E + N 6 h

Table 3 - Pin Arrangement for Plugs, Socket Outlets and Cable-Coupler

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Specification for Temporary Supply for Constr. and Maint. Work

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NOTE: Class 2 and 3 portable tools and Class 2 lamps systems are not earthed. Supply cables between outlet units and tools shall be of two core type. The earth pins shall remain unconnected.

2.5.3 Cable

All cables forming part of fixed installations shall conform to IEC 60502 with the requirements specified in Table 4

COMPONENT MATERIAL

Conductor Stranded copper

Insulation XLPE or PVC

Armouring Galvanised steel wire or steel braid. Aluminium wire for single core cables.

Overall Sheath PVC(Polyvinyl Chloride) or HOFR(Heat-Resisting Oil Resistant) sheath

Table 4 - Material for Cables for Fixed Installation

All cables forming part of re-locatable or portable installation shall conform to IEC 60245 with the requirement specified in Table 5

COMPONENT MATERIAL

Conductor Flexible (multi-strand) copper

Insulation Elasteric

Armouring Flexible braided unarmoured for Class 2 and Class 3 equipment

Overall Sheath Heavy duty HOFR sheath

Table 5 - Material for Cables for Re-locatable and Portable Installation

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2.6 INSTALLATION

2.6.1 General

The standard of installation shall be in accordance with SP-1099.

2.6.2 Distribution Equipment Location

All equipment described in Section 2.5 shall be located to meet criteria of:

- Easily accessible in case of emergency.

- Unlikely to be obstructed as construction continues.

- Cable runs kept as short as possible; power sources close to points of use.

- Protected from damage by other plant.

- Protected from direct sunlight.

In addition, the main distribution unit shall be located close to the power source (generator) and separate from the rest of the worksite. It should not be accessible to non-electrical staff, and for this reason it should be installed in a fenced-off area.

2.6.3 Cables

2.6.3.1 Cable Fixing

Cables shall be installed to avoid being damaged and to minimise obstruction to other construction plant and services. Cables within building or Porta-cabins shall be installed in accordance with SP-1099.

Main incoming cables to the MDU:s shall be directly buried. All cables that are buried shall be at a minimum depth of 0.5 meter.

All temporary cables shall be of a type incorporating a galvanised steel wire armour or braiding which is continuous and effectively earthed, with the exception of flexible leads to Class 2 and Class 3 tools.

Cables shall be directly buried where possible, unless otherwise agreed at site; in which case an approved means of physical protection shall be applied, e.g., conduit, trunking or elevation on catenaries or supports above the working area.

Cables may be supported in any convenient manner, provided that:

- Supports are arranged so that there is no appreciable mechanical strain on any cable termination.

- They shall not be damaged by site activities.

- As far as possible they shall be installed such that they do not need to be moved during the construction period.

- They shall not obstruct site activities and movements.

- They shall not constitute a hazard to personnel.

The Contractor shall submit a cable route drawing with the Tender, showing the planned location of all transformer and outlet units, and cable routings, indicating how the cables are to be run.

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It is accepted that in some instances, for short periods, cables may need to lie on the ground, in which case additional protection shall be provided such as protective ramps to allow vehicles to cross, and the cable route shall be clearly marked.

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2.6.3.2 Cable Termination

All cables, armoured or unarmoured, terminating in fixed power outlets, shall be terminated using compression glands. All armoured cables shall be terminated using double compression cable glands with armour clamps.

Cables terminating in plugs or sockets shall be securely anchored with insulated clamps at points of entry. A tough resilient sheath shall be fitted over the cable and the mouth of the plug or socket, to minimise excessive flexing.

For more information on cable termination refer SP-1099, Appendix 1.

2.6.3.3 Cable Extension

Cable joints shall not be used. If cable extensions are required they shall be made using Extension Outlet Units, as described in Section 2.5.1. Other types of extensions shall not be permitted.

Flexible leads and cables to portable tools shall be of sufficient length to reach work areas without exerting any mechanical strain on cable.

2.6.4 Welding Generators

The auxiliary single phase winding shall be provided with overload protection in the form of a Moulded Case Circuit Breaker (MCCB) and all individual socket outlets shall have an earth leakage circuit breaker (30 mA / 40 ms). The wiring shall comply to 2.6.4.1 or 2.6.4.2 for earthed or non earthed systems respectively.

2.6.4.1 Earthed system

A moulded case circuit breaker rated to the maximum output current of the generator auxiliary single phase winding but not exceeding 16 A, shall be fitted in the phase conductor (L). An earth leakage circuit breaker shall be provided between phase (L) and neutral (N) conductor (double pole). The neutral line of the auxiliary single phase winding shall be bonded to the frame of the welding generator, before the ELCB. In addition, the frame of the welding machine shall be bonded to an earth electrode with a maximum electrode resistance of 25 ohm. Existing plant earthing / bonding points may be used. For wiring diagram see Figure 3.

2.6.4.2 Non Earthed system

The neutral of the single phase winding and the frame of the generator shall not (intentionally) be earthed.

A moulded case circuit breaker rated to the maximum output current of the generator auxiliary single phase winding, but not exceeding 16 A shall be fitted in the phase conductor (L).

An earth leakage circuit breaker (ELCB) shall be fitted across phase (L) and neutral conductor (double pole) between the MCCB and the socket outlet.

The protective conductor (PE) shall be bonded to the neutral of the auxiliary single phase winding i.e. up stream of the ELCB. The generator frame shall be bonded to the protective conductor. For wiring diagram, see Figure 4.

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2.7 TESTING AND INSPECTION

2.7.1 System Testing

Before the distribution system is put into service it shall be tested by the Contractor according to the requirements of the IEE Regulations, and subsequently at three-monthly intervals.

Test results shall be recorded on Inspection Certificates conforming to the specimen in Appendix 3, copies of which shall be submitted to the Company.

Testing and Inspection shall include:

- Visual inspection.

- Continuity of final circuit conductors.

- Continuity of protective conductors.

- Earth fault loop impedance.

- Polarity.

- Insulation resistance.

- Operation of residual current devices by an approved test method.

- Earth electrode resistance.

2.7.2 Planned Inspection

In addition to the testing described above, the Contractor shall implement a system of planned inspections of all equipment at regular intervals not exceeding two-weeks. The main Contractor shall ensure that all subcontractors adopt a similar system. Particular attention shall be paid, but not be limited to:

Power Tools : Integrity of cable and unit general

condition.

Plugs, Socket Outlets, Couplers : Free from improvised modifications and

signs of malfunction, mal-operation or maltreatment.

Cables : Free from defects caused by impact or

chaffing.

NOTE: A typical checklist is included as a guide in Appendix 4.

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2.7.3 Inspection System

2.7.3.1 Implementation

The Contractor shall be responsible for implementation of an inspection/maintenance system and he shall provide details of his system with the Tender. The following points are the minimum required.

All portable apparatus shall be identified by a serial number which shall be recorded in a register.

The register shall indicate how often each item should be recalled for routine inspection and maintenance, and a competent person shall be appointed to recover each item on its due date.

A register of competent persons who perform inspection shall be maintained.

A tag shall be affixed to equipment (generators, transformers, switchboards, motors etc.) and tools with the following information, so that it is clear to the Inspector / User when the inspection and maintenance are due:

- Maintenance / Inspection due date:

- Date carried out:

- Carried out by:

- Next due date:

Frequency of recall shall depend on both type and use of apparatus and is best determined in the light of experience by a qualified person, taking into account any recommendations made by Manufacturers.

Both inspection and maintenance shall be performed by competent persons, appointed by the Contractor.

Units which are unserviceable or in unsafe condition shall be withdrawn from use until defects have been rectified.

2.7.3.2 Repairs

Repairs shall be performed only by competent persons experienced in this kind of work.

All repaired equipment shall be inspected and approved for use by the nominated competent electrical persons before being returned to service.

2.8 DOCUMENTATION

The Contractor shall establish a register on the worksite to record and hold documents relating to the electrical installation. These shall include:

- Single-Line Diagrams.

- Cable/Tray/Trench Routing.

- Load Calculations.

- Inspection Test Certificates.

- Equipment Inspection Records.

- Records of Alterations.

Originals of drawings and at least one print of each shall be kept. All alterations shall be marked on a master print and the original shall be brought up to date. All issues of drawings shall be retained to record the history of all additions and alterations to the distribution systems.

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FIGURE 1 AND 2 - CIRCUITS FOR PORTABLE TOOLS

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FIGURE 3 - CIRCUIT FOR EARTHED AUXILLIARY SUPPLY FROM WELDING SETS

FIGURE 4 - CIRCUIT FOR NON-EARTHED AUXILLIARY SUPPLY FROM WELDING SETS

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APPENDIX 1 - TYPICAL SINGLE LINE DIAGRAM

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APPENDIX 2 - ELECTRICAL LOAD ASSESSMENT DATA SHEET

PLANT 415 V 3-PHASE PORTABLE TOOLS SITE LIGHTINGTEMPORARY

ACCOMMODATION

240 V 1-PHASE

Type kW No. Total Type kW No. Total Location Type kW Requirement kW

Tower Crane Chasers Lighting

Hoist Hammers Air Conditioning

Platform Hoist Saws Water Heating

Air Compressor Drills Drying

Pump ' A ' Sanders Cooking

Pump ' B ' Vibrators Miscellaneous

Saw Bench Air Blowers External Lighting

Batching Dehumidifiers

Plant

Total Load Total Load Total Load Total LoadDiversity Factor Diversity Factor Diversity Factor Diversity FactorDemand Load Demand Load Demand Load Demand Load

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APPENDIX-3 - DCS SYSTEM ELECTRICAL SUPPLY

Contract No.: Location: Site contact:

Intake supply Size: A Short-circuit current at intake kA

Main protection type: Fuses MCCB MCCB/RCD /mA

Type of earthing arrangements

TN-S TN-C-S TT

Line / earth loop impedance at intake: ohm (Ω)

Sub-circuit details Fuses MCCB/MCB MCCB/MCB/RCD

MDU No.: Main protection

Circuit No: Sub-CCT protection

A

A

A

A

A/mA

A/mA

Fixed or portable equipment:

Line/earth loop impedance: ohm (Ω)

Continuity: ohm (Ω)

Polarity check Cable type: Cable size:

Cable installation: U/G O/H Surface Cable Condition

Cable insulation resistance in megohm (MΩ):

P-EP-PP-N

Recommended action:

Date of inspection: Inspector's signature:

Date of next inspection:

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APPENDIX 4 - ANCILLARY ITEMS FOR SUBSTATIONS

AREA / EQUIPMENT

INSPECTION GUIDE LINES CONFIRM CHECKE

D

OBSERVATION / REMARKS

General Confirm single line diagram is correct and current

Main distribution / Sub-main distribution

ENCLOSURE

Defective door hinges / seals.

Locking facilities and devices.

Vermin-proof integrity.

Identification / warning notices.

Integrity of earth bonding.

INTERNAL ARRANGEMENT.

Missing phase separation panels.

Defective components.

Integrity of connections and glands.

Ingress of dust and moisture

Transformer ENCLOSURE

Damaged sockets outlets

Vermin proof integrity

Identification and warning labels

Integrity of earth bonding

INTERNAL ARRANGEMENT

Integrity of connections and glands

Defective components

Ingress of dust and moisture

Plugs / Sockets / Outlets / Couplers

EXTERNAL

Cover damages

Correct plugs are fitted and colour coding is correct and distinctive

INTERNAL

Cable grips fitted

Connection are correct

Cables EXTERNAL

Ensure that distribution cables are not causing a hazard at openings, passages, ladders, stairs etc.

Ensure that cables are not lying on ground unprotected from physical damage or wet conditions.

Ensure that lighting circuits are used for power tools.

Contimue next page

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Cables TERMINATION

Cable identification at both ends

Use of armoured / unarmoured cables

Integrity of glanding

Mechanical support of above ground cables.

Terminal boxes are totally enclosed.

Proper bonding of armour.

Cable route markers.

Portable Tools EXTERNAL

Fitted with correct type and undamaged plug.

Double-insulation symbol on class 2 tools.

Machines are not damaged.

Chuck of drilling machines in good condition and correct key attached

INTERNAL

Brush gear and commutator

All screws are in position/secure.

Cable entry to the tool protected with heavy rubber sleeve

Welding sets General condition of the set.

Wires are not exposed.

ELCB operating correctly

Overload protection provided

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APPENDIX A: GLOSSARY OF DEFINITIONS, TERMS AND ABBREVIATIONS

The following terms and abbreviations used in this specification, are defined below:

General Terminology

Company - Petroleum Development Oman LLC of Muscat, Sultanate of Oman

Contractor A party holding a Contract with the Company and who is responsible for the construction, commissioning and other related works specified in the Contract. A Contractor may be responsible for the duties of both Consultant and Contractor

Manufacturer - A party responsible for the manufacture of material or equipment to perform the duties specified by the Consultant, Contractor or the Company

May - The word 'may' is to be understood as indicating a possible course of action

Shall - The word 'shall' is to be understood as mandatory

Should - The word 'should' is to be understood as strongly recommended

User A qualified engineer, Consultant or Contractor who applies these standards in the execution of a PDO project or Contract

Worksite - The defined place designated by the Company where all Works and services shall be executed by the Contractor under the Contract

Abbreviation

BS - British Standard

DEP Design Engineering Practice

ERD - Engineering Reference Document

IEC - International Electrotechnical Commission

IEE - Institute of Electrical Engineers

MCB Miniature Circuit Breaker

MCCB - Moulded Case Circuit Breaker

PDO - Petroleum Development Oman LLC.

CFDH - Corporate Functional Discipline Head

SP - Specification (PDO)

GU - Guidelines (PDO)

PR - Procedures (PDO)

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SP USER-COMMENT FORM

SP User-Comment Form

If you find something that is incorrect, ambiguous or could be better in an SP, write your comments and suggestions on this form. Send the form to the Document Control Section (DCS). They make a record of your comment and send the form to the correct CFDH. The form has spaces for your personal details. This lets DCS or the CFDH ask you about your comments and tell you about the decision.

SP Details Title Issue Date:Number:

Page number: Heading Number: Figure Number:

Comments:

Suggestions:

User’s personal details

Name: Ref. Ind: Signature: Date:

Phone:

Document Control Section Actions

Comment Number: Dates CFDH

Ref. Ind.:Recd: To CFDH:

CFDH Actions

Recd Date:

Decision:Reject:Accept, revise at next issue:Accept, issue temporary amendment

Inits: Ref.

Ind.:

Date:

Comments:

Originator Advised:

Date: Inits: Document Control Section Advised:

Date: Inits:

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