Employer’s Requirements Outline Specification February 2017 · 2017. 2. 20. · ALCONBURY WEALD – INCUBATOR² MECHANICAL, ELECTRICAL AND PUBLIC HEALTH SYSTEMS – EMPLOYER’S

ALCONBURY WEALD – INCUBATOR2

Employer’s Requirements Outline Specification

February 2017

ALCONBURY WEALD – INCUBATOR²

MECHANICAL, ELECTRICAL AND PUBLIC HEALTH SYSTEMS – EMPLOYER’S REQUIREMENTS OUTLINE SPECIFICATION

February 2017 X:\Projects\2601167 - Alconbury Incubator 2\08 Reports and Design Notes\Stage 3 Report\REP-2601167-08-TCJT-20170205-Employer's Requirements Outline Specification.doc

Report Audit

Rev. Description Prepared and Checked by: Reviewed by: Date:

T1 Tender Issue TC | CJB | JT NW 6th February 2017

This report is provided for the stated purposes and for the sole use of the named Client. It shall be confidential to the Client and the client’s professional advisers. Hoare Lea accepts responsibility to the Client alone that the report has been prepared with the skill, care and diligence of a competent engineer, but accepts no responsibility whatsoever to any parties other than the Client. Any such parties rely upon the report at their own risk. Neither the whole nor any part of the report nor reference to it may be included in any published document, circular or statement nor published in any way without Hoare Lea’s written approval of the form and content in which it may appear.




CONTENTS

1.0 INTRODUCTION

2.0 INCOMING SERVICES PROVISION

3.0 DESIGN CRITERIA AND SERVICING STRATEGY

4.0 MECHANICAL SYSTEMS

5.0 PUBLIC HEALTH SYSTEMS

6.0 ELECTRICAL SYSTEMS

7.0 SUSTAINABILITY

APPENDIX A – LUMINAIRE SCHEDULE

APPENDIX B – MEP DRAWINGS




1. Introduction

This document forms Volume Six – Building Services Consultant Design Drawings and Specification, of the

Employer’s Requirements, which describes the design proposals for the Mechanical, Electrical and Public

Health engineering systems and design criteria proposed for the Alconbury Weald Incubator² development.

This information has been based on the Urban and Civic briefing information and subsequent development

with the design team.

The development consists of two floors of office space divided by a central core of entrance, breakout, WC,

shower, kitchen, lift and meeting room, with associated car parking. The figure below reflects the indicative

redline outline of the proposed Alconbury Weald Incubator² site.

Figure 1.1 – Masterplan Reference to Allford Hall Monaghan Morris Architects Pre-application Package

The current Hoare Lea appointment is limited to the Alconbury Weald Incubator² Building, where Hoare Lea

shall adopt a monitoring role on behalf of Urban and Civic post tender, for the Design and Build Contractor’s

detailed design, installation, testing and commissioning.

The figure below reflects the Alconbury Weald Incubator² Site Plan, where the development shall consist of two

storey office areas. The site shall see two entrances, one main entrance to the front and an additional staff

entrance to the rear of the building. The building shall also see an external walkway stretching around the

perimeter.

Figure 1.2 – Scope of Hoare Lea’s Employer’s Requirements Information

Please refer to the Peter Brett Associates Employer’s Requirements which outlines the incoming services to

the Incubator² Building.

Peter Brett Associates shall be providing external lighting for the Alconbury Weald Incubator² building,

associated carpark, delivery area perimeter walkways, within the redline demise above.




2. Incoming Services Provision

The incoming services shall be coordinated with Peter Brett Associates to accommodate the following

requirements:

2.1 Incoming Electric

The assessed maximum demand has been carried out in accordance with the Building Council for Offices

(BCO) and the developed general arrangements. This information has been coordinated with PBA who have

specified a new substation to facilitate a 400A TP&N supply to the ground floor LV room.

This 400A TP&N shall be coordinated with the Utilities Contractor to serve a wall mounted LV panel board.

2.2 Incoming Gas

Hot water shall be provided via a direct gas fired condensing high efficiency water heater requiring an

estimated 5m3/hr natural gas supply. This along with the gas meter is to be located within a small ground floor

plantroom which is externally accessed.

2.3 Incoming Water

The incoming metered water supply is to enter the building in the dedicated boosted cold water service plant

room at ground floor, which is externally accessed.

Space shall be allowed for fitment of a cold water storage break tank and booster set for the Building Council

for Offices (BCO) Guide to Specification 2014 requirement and in the event of insufficient water mains

pressure. To operate the building with mains cold water directly it is estimated that a 32mm supply would be

required at a flow rate of 0.89 l/s. An on-site flow and pressure test would be required to determine adequate

supply is available.

2.4 Incoming Data & Telecoms

The incoming route for these systems shall be developed as part of detailed design but it is envisaged that the

incoming data services shall be located within the core area LV intake room or first floor main comms room.

There shall be a provision for dedicated telecoms lines for; lift system, fire alarm system, disabled refuge

system and security system and reception telephone.




3. Design Criteria and Servicing Strategy

3.1 General

The design of the building mechanical and electrical engineering systems shall aim to reflect:

• Cost effective design

• Best available life cycles for all systems

• Flexibility in operation where practical

• Allow for future growth and adaption (where possible)

• Economic utilisation of energy

• Minimise cost in use

• Good environmental performance

• Safe construction and use

• Update the current central plant to comply with Building Regulations and BCO 2014 requirements.

The design of the mechanical and electrical engineering systems shall be carried out with intent to minimise

the use of energy and water consumption.

3.2 Selection of Materials, Components and Systems

As far as practical, the selection of materials, components and systems shall be constructed and installed to

avoid built in obsolescence and whenever possible be standardised throughout the development. Ideally no

element shall be so specialised as to be only available from a single source.

3.3 Plant and Equipment Life

The works shall be designed with materials, components and techniques that are readily available, reliable and

maintainable so that, provided the building is maintained in accordance with good practice and the guidelines

and recommendations contained in the operation and maintenance manuals, the plant life expectancies as

stated on the adjacent table can be achieved.

Wherever practicable all plant and materials shall be from suppliers established and operating in the UK and

each shall guarantee the supply of spare parts consistent with effective maintenance. Similar items of

equipment shall be supplied by the same manufacturer and corresponding parts shall be interchangeable.

The installations shall generally be provided in accordance with the BCO guide and the standards agreed and

defined in this report to effect optimum flexibility in space planning.

The installations shall be designed to avoid unwanted effects of air borne and structure borne noise, vibration

and spillage, which might have an unnecessary detrimental effect upon the performance of the building as a

whole.

The systems and plant shall, with the proper standard of maintenance, present no health hazard to the

occupants of the building, maintenance personnel, or the occupants of neighbouring buildings.

Where possible, all plant shall be capable of replacement during the life of the building without the need for

primary structural modifications.

Plant Item Life Expectancy

(years)

All central pumps 20

VRF Condensers 10

VRF Indoor Units 10

Central water storage tank (uPVC) 25

Booster Pump set 15

Office supply and extract ventilation units 15

Toilet supply and extract ventilation units 15

High Voltage switchgear and Transformers 25

Main Low Voltage switch panels 25

Central building management system (BMS). 10

Lift 15

Figure 3.1 – Table of Plant Life Expectancy

3.4 Flexibility and Adaptability

It is important to consider options to ‘future proof’ the building considering potential future use. The design aim

shall be for flexible solutions that can be adapted to meet potential changes in use or internal layout through

the life of the building. The following shall be considered:

• Climate change – specific requirements (e.g. design for elevated external summer temperature)

• HVAC systems can be adapted to suit change of use / layout of space providing internal flexibility.




3.5 Building Zoning

It is anticipated that the engineering services installation shall be fully zoned for each floor of the building with

the potential for multi-tenant occupancy. Design solutions shall be chosen with capital and revenue

expenditure, the operational considerations, energy recovery and general conservation being paramount.

Heating, ventilation and electrical zoning shall be configured to promote flexibility in order to enable re-

modelling and re-planning to be undertaken at a future date.

It is envisaged that sub-metering of all major services to each area/function shall be required as described in

the Building Regulations.

3.6 Regulations, Codes & Standards

The MEP design shall be developed to comply with all relevant UK and European legal and statutory

requirements including Town and Country Planning Regulations, Building Regulations, Construction Design

and Management Regulations, Health and Safety at Work Act and the Environmental Protection Act unless

otherwise agreed.

The design shall be based on a list of standards agreed with the Client as part of this briefing process. Where

deviations from these standards are required they shall be added to a list of project deviations, and provided

for review and approval prior to commencing detailed design.

Where items are not specifically covered by the relevant specialist documents reference shall be made to the

BCO Guide, CIBSE publications and relevant British Standards and Codes of Practice.

The design of new plant shall conform to the Statutory Requirements and Regulations of all controlling

Authorities and all relevant Standards and Codes of Practice. Wherever a Standard or Code of Practice is

referred to it shall imply the latest issue and/or revision applicable at the time. If no British Standard exists, the

design shall comply with an equivalent standard published by a member of the European Community as

recognised in the UK. Standards and regulations include, but are not limited to:

• Alconbury Weald Key Phase 1 Design Guide

• Peter Brett Alconbury Weald Key Phase 1 Sustainability Statement

• British Standards and Codes of Practice

• Local Authority requirements

• Local Planning requirements

• Statutory Instruments

• Local Fire Authority requirements

• The Fire Precautions Act 1971 (as amended)

• The Fire Precautions (Workplace) Regulations 1997 (as amended)

• Health and Safety Executive Guidelines

• Construction (Design and Management) Regulation

• Factories Act

• Pollution Act

• Building Regulations

• IEE Wiring Regulations

• Lighting of work places BS EN 12464-1:2011

• Water Regulations

• Environmental Health Requirements

• CIBSE Design Codes

• Institute of Public Health Engineers Design Guide

• Building Council for Office 2014 Guide to Specification




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3.7 Design Criteria

This section outlines the design team’s proposals based on the initial and latest Urban and Civic brief documentation, in addition to the Alconbury Weald Key Plan 1 Design Code.

Where clause titles in this specification have codes (e.g. ‘T10’, ‘U10’) these are the codes of the Common Arrangement of Work Sections (CAWS) that are widely used in the UK building industry for categorising building

engineering services systems and components.

SYSTEM / ITEM Design Criteria in accordance with; U&C Briefing, Building Council for Offices Guide to Specification 2014, CIBSE Design Guide, Hoare Lea Recommendations

Internal temperatures Office/Entrance Summer 24°C ± 2°C, relative humidity uncontrolled

(For mixed mode and naturally ventilated offices, the internal temperature should not exceed 25°C for more than 5% of the occupied hours and 28°C for no more than 1%)

Office/Entrance Winter 21°C, relative humidity uncontrolled

Circulation Areas 18°C, relative humidity uncontrolled

WCs 20°C, relative humidity uncontrolled

Disabled WCs 21°C, relative humidity uncontrolled

External Design conditions 31°C db, 21°C wb Summer (Norwich CIBSE Weather File)

-4°C db, -4°C wb Winter (Norwich CIBSE Weather File)

-10°C dB for air handling frost coil selection

Occupancy Office – 10m2/person

Noise Criteria Open Plan Office – NR40 (BCO requirement)

Circulation and Entrance Lobbies – to be developed / NR40 (BCO requirement)

Plant Space – to be developed / NR55

WCs – to be developed / NR45 (BCO requirement)

Cooling Load

Office Small Power – 25 W/m²

Office Lighting – 10 W/m²

Office Occupants – 9 W/m²

Comms room – 3kW per rack and coordination with ancillary / UPS equipment loads

Ventilation/Fresh air provision Office – 12 l/s per person Supply and Extract

Disabled WC/WCs – 10ac/hr Extract 8ac/hr Supply/Make-up Air

Kitchen – 15 l/s Extract

S32 - Incoming Gas Supply Metered gas connection for direct water heater




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S10 - Incoming Water Supply Incoming sub metered

Design allowance for incoming water +1l/s for future use

Provide tender allowance for leak detection

V12 - Incoming Electric Supply A 400 volt 50Hz 3-phase power supply is to be provided with a meter position.

Design allowance for incoming electrics +25% future use

New private sub-station to be provided by PBA.

Intake location to be coordinated.

W10 – Incoming Telecommunications Provide and coordinate fibre line in accordance with Tenant’s IT.

Provide telephony Line for Lift dial-out to be provided.

Allowance for reception telephone line

Allow provision for future Redcare dial-out for fire alarm system and future intruder alarm system (containment)

Plant Space Note that the Roof Plant has not been space planned to accommodate future tenant’s plant

X10 - Lift 8 person DDA machines room less passenger lift to serve ground and first floor. This shall meet all current and relevant building codes and regulations.

Lift (as Schindler 5500) to have brushed stainless steel doors and trim. Interior of the lift car to be brushed stainless steel with a mirrored back wall. Floor finish to match the entrance foyer.

Building Regulations Building Regulations Part L2A

Building Fabric Thermal Performance Wall – 0.18 W/m².K

Roof – 0.15 W/m².K

Ground Floor – 0.20 W/m².K

Windows (including frame) – 1.40 W/m².K (0.40 G Value)

Louvres / Rooflights (including frame) – 1.2 W/m².K (0.40 G Value)

Air Permeability 3.5m³/h.m² at 50Pa (in-line with BCO Guide)

BREEAM Not Applicable

Sustainability Meet Building Regulations Part L2A 2013 (circa 9% reduction over 2010)




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U10 - Ventilation Natural Ventilation Heat Recycling (NVHR) units within the office spaces and Mechanical Ventilation with Heat Recovery (MVHR) units for the core areas.

Mechanical extract for staff facilities (WC, Changing and Kitchenette/Café).

T31 - Heating An allowance for VRF fan coil units to offices with electric panels to ancillary staff spaces.

T70 - Cooling An allowance VRF fan coil units to the offices, meeting room and server room only.

DX to comms room cooling

W60 – Building Management System Automatic BMS controls – further detail to be provided during next stage.

V20 – Low Voltage Distribution 400A TP&N incoming supply based on BCO load allowances and provision for kitchen and electric heating.

V32 - Uninterruptable Power Supplies Allow tender cost option for 2No. 3kW rack mounted UPS modules, complete with 10 minute autonomy (as Gamatronic).

V21 – Lighting Offices 350 – 450 lux (on working plane)

Kitchen 400 – 500 lux

Entrances 300 lux at FFL

WCs & Circulation 150 – 200 lux at FFL

Stairs 150 – 200 lux at FFL (as circulation)

Lighting shall be designed to BCO Guidelines / LG7 / BS EN 12464-1:201CIBSE Lighting Guide / Part L and relevant BS / EN

V22 – General Power Split metered distribution boards to be provided to meet CIBSE TM39, to monitor lighting, mechanical and small power loads.

Distribution boards to be adequately sized to accommodate Tenant’s CAT-B installation with additional 25% spare capacity.

Small power to WC and shower provision to meet Part M and relevant codes

Cleaner’s sockets provided on dedicate ring circuit.

All exposed accessorise within common areas to be brushed stainless steel.

Allow lobby area to be provided with 3No. floor boxes for future reception desk position.

The Tenant’s Cat-A office areas shall be provided with power to lighting, lighting control and mechanical supplies at high level, with low level small power limited to cleaner sockets.

Tenant’s and landlords supplies to be derived from respective distribution boards. Mechanical power and lighting circuits within tenant’s demise to suit future restack / cellular spaces.

Comms room racks to be supplied from 16A BS 60309-2 commando outlets at high level.

V40 – Emergency Lighting Emergency lighting throughout the entire building shall be provided to meet current regulations and standards

V41 – Street/ area/ flood lighting Refer to PBA Package

External lighting to meet requirements of ‘Alconbury Key Phase 1 Design Code – FINAL approved version (February 2015) Section 8.4.4 Lighting)’




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W15 - Information technology Provide 2No. 800x 800 42U IT racks for IT specialist to utilise.

W30 - Information technology cabling CAT 6A cabling to be provided as required.

Provide high level data basket connectivity from the comms room to all areas as outlined on the containment drawings. This shall also facilitate future PoE Wifi network system.

Note that tenant/s to provide IT cabling to their demise as part of their fit-out works.

W50 - Fire Alarm and Detection Fire alarm system to be provided to meet BS 5839, fire strategy and building control.

Allow level of coverage to be category L1 but to be confirmed by the fire engineer’s strategy.

The fire alarm system shall be provided with a red-care dial-out facility.

Allow dedicated loop per tenant and landlord (i.e 5No total).

W14 - Disabled Toilet Disabled toilet and shower to comply with BS 8300. The system shall comprise local call cords, remote reset units and over-door indicators. All alarm singles shall report back to indicator located at reception.

W40 – Access Control

Provide high level security trunking connectivity from the LV room and comms room to all areas as outlined on the drawings. Allow for underfloor ducts to entrances. Provide door containment to allow for future tenant’s access control system as outlined on the drawings.

Access Control System to be provided as part of the Tenant/s fit-out as required.

W41 – Intruder Alarm System

Provide security containment connectivity from the LV room and comms room to all areas as outlined on the drawings, to for future intruder alarm system to be installed.

W42 – Surveillance System

Provide security containment connectivity from the LV room and comms room to all areas as outlined on the drawings, to allow future CCTV system to be installed.

W52 – Lightning Protection

To be provided in accordance with BS EN 62305.




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4. Mechanical Systems

This section provides an outline of the engineering services that are proposed to be provided as part

of the base build provision to the proposed Alconbury Weald Incubator² building:

Where clause titles in this specification have codes (e.g. ‘S10’, ‘S65’) these are the codes of the

Common Arrangement of Work Sections (CAWS) that are widely used in the UK building industry for

categorising building engineering services systems and components.

T15 Solar Collectors It has not been proposed to include solar hot water collectors for the domestic hot water services

(DHWS) system. This shall be reviewed if the requirement changes and it is deemed that they shall

be necessary for the development to be in accordance with planning and the energy strategy.

T42 Local Heating Units Local electric heating radiator panels shall be allowed within the staff facilities and circulation areas,

this includes electric towel rails within the shower rooms. These shall be provided with tamper proof 7-

day calendar timer control.

Electric underfloor heating shall be installed within the ground floor entrance/breakout area and main

circulation area within the core. This shall be coordinated with any electrical services that require to

run below the finished floor for distribution or to serve floor boxes proposed within this area. This shall

be provided with a room air and floor temperature sensor along with a tamper proof 7-day calendar

timer control.

T60 Central Refrigeration Plant There is not a requirement to install central refrigeration plant as part of the shell and core fit-out.

T62 Variable Refrigerant Flow (VRF) System A VRF heating and cooling system shall be allowed for the ground and first floor office spaces and

meeting room. In the office spaces heating and cooling shall be distributed via ceiling mounted

cassette fan coil units and coordinated with the ventilation and lighting. A duct mounted VRF heating

and cooling coil shall be installed to the meeting room ventilation system. A VRF cooling system shall

be allowed for the first floor Comms. room with a wall mounted fan coil unit. External condensers shall

be located at roof level above the core and within a screened plant area. These shall not be installed

as part of the base build and shall be provided as part of the fit out as required.

U10 General Supply and Extract Ventilation System Natural ventilation heat recycling (NVHR) units shall be allowed for within the ground and first floor

office spaces to allow for single sided ventilation with the use of low level window openings. The

building has been designed so that the NVHR units manage overheating and the mechanical cooling

is for peak lopping or to manage a tenant whose fit-out results in higher than average heat gains.

Figure U10 – Example of NVHR units within First Floor Office Space

A dedicated mechanical ventilation heat recovery (MVHR) unit shall be installed to serve the meeting

room, stacked on a larger unit to serve the core areas. The meeting room MVHR unit shall have a

heating and cooling coil on the supply and ducted through the roof onto slot diffusers both ends of the

meeting room and coordinated with the rooflight and other services.

U11 Toilet Supply and Extract The MVHR unit serving the core shall extract from WC’s, showers, kitchen and cleaners stores,

supplying air to the ground floor entrance and breakout through wall mounted jet nozzles and diffusers

in circulation areas. This shall keep the toilet areas under negative pressure and prevent the release

of odour from the toilet rooms to adjacent areas. The extract fan shall be specified with a twin extract

fan to allow for duty and standby to meet Building Regulations 2010 Approved Document F. The




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systems shall generally be operated by occupancy sensors within the toilet areas to increase from a

trickle/background ventilation rate to boost, with a timed run-on period.

U12 Kitchen Ventilation There is not a requirement for commercial kitchen ventilation, however allowance for a mechanical

extract fan for the staff kitchens shall be made.

U14 Smoke Extract / Smoke Control Confirm if to be provided to suit the fire strategy. Please refer to the Fire Engineering report.




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5. Public Health Systems






R10 Rainwater Pipework

A rainwater system capable of removing the surface water from the roof and discharging it to the

below ground disposal system, in compliance with BS EN 12056-3 shall be provided via a traditional

gravity system. The rainfall intensity shall be chosen with due regard to the nature and use of the

building and appropriate degree of risk that can be accepted.

The roof shall be drained via a roof gutter, outlets and rainwater pipes to suit the Architect’s roof

design and shall be detailed within the Architectural packages.

Access doors shall be installed on rainwater pipework to facilitate rodding and maintenance access to

installed pipework. Access through architectural casings shall be co-ordinated with pipe accessories.

Generally access doors shall be provided to all main rainwater pipes in accordance with BS EN 12056

at 1200mm above ground floor level.

Material shall be either stainless steel or plastic.

R11 Foul Drainage Above Ground

All sanitary appliances, floor drainage from plantrooms and mechanical plant shall be drained via a

gravity foul drainage above ground system, using the minimum of pipework and fittings.

Sanitary discharge stacks shall be installed in lightweight cast iron for its fire resistance, life

expectancy and sound insulation properties.

The small diameter sanitary waste and vent pipework shall be installed in muPVC to BS EN 1566 and

shall generally be concealed. Where small diameter pipework is exposed it shall be a light grey colour

or chromium plated finish.

Access doors or caps shall be installed on sanitary pipework to facilitate rodding and maintenance

access to installed pipework. Access through architectural casings shall be co-ordinated with pipe

accessories. Generally access doors shall be provided to all main discharge pipes in accordance with

BS EN 12056 at 1200mm above ground floor level and at all other floor levels where appliances are

drained.

Where ventilating pipework is necessary to suit either the below ground drainage system or the

sanitary plumbing system, it is proposed to terminate through the roof or façade to meet architectural

and technical requirements.

There is currently no provision for above ground drainage to the main office areas.

R12 Drainage Below Ground

Excluded from Hoare Lea design and to be provided by Peter Brett Associates.

S10 Cold Water

Use the CIPHE (IoP) method for determining domestic cold water flow rates. The minimum operating

pressure to be achieved upstream of the outlets is to be between 2.5 to 3.0 bar.

An electromagnetic water conditioning unit on the mains cold water supply shall be provided to reduce

the build-up of scale within the system.

Pressure regulation is to be provided where necessary to maintain optimum water pressure to draw

off points.

Space shall be allowed for the future fitment of a cold water storage break tank and booster set for the

Building Council for Offices (BCO) Guide to Specification 2014 requirement and in the event of

insufficient water mains pressure.

S11 Hot Water

A direct gas fired water heater shall be provided on the ground floor to serve WC areas, cleaner’s

cupboard, showers and kitchens via a primary and secondary return system. Use the CIPHE (IoP)

method for determining domestic hot water flow rates. The minimum operating pressure to be

achieved upstream of the outlets is to be between 2.5 to 3.0 bar.

Hot water storage provisions shall be dependent upon the final selection of hot water generating

equipment.




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All hot water outlets shall be controlled by thermostatic mixing valves complying with the TMV3

scheme, with the exception of the tea-points and cleaners sinks.

Pressure regulation is to be provided where necessary to maintain optimum water pressure to draw

off points.

S61 Dry Risers

Confirm if to be provided to suit the fire strategy. Please refer to the Fire Engineering report.

S65 External Hydrants (Private)

Confirm if to be provided to suit the fire strategy. Please refer to the Fire Engineering Report.

S70 Gaseous Fire Extinguishing Systems

Not applicable.

The materials selected for this project are as follows;

BS 4514 - Unplastisized PVC soil and ventilating pipe, fittings and accessories.

BE EN 1329 - Plastics piping systems for soil and waste discharge.

BS 1566 - Plastic waste pipes and fittings.

BS 3943 - Plastic waste traps.

BS EN 1254 - Copper and copper alloys.

BS EN 877 - Cast iron pipes and fittings (lightweight cast iron).

BS EN 1057 - R250 copper tube and fittings.

BS EN 1519 - HDPE pipework and fittings.




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6. Electrical Systems






V12 Public Utility / Incoming Supply

A 400V, 50Hz, 3-phase incoming power supply, shall be provided to the ground floor LV room. Refer

to Section 2 of this report regarding details of the incoming supply and Peter Brett Associates tender

information.

V17 Photovoltaic Power Supply

In order to comply with Part L of the Building Regulations and the planning requirements, it is

proposed to install photovoltaic (PV) panels to the building. The PV panels shall be located on the

roof area and orientated south, mounted at an angle, for maximum efficiency. Inverters, to convert

the electricity from DC to AC, shall be positioned locally to the panels on the roof. A fall arrest system

shall be required to allow safe cleaning of the panels. The electricity generated by the PV panels

shall be used for landlord services, such as kitchen, lighting, lifts and pumps, in order to not

complicate the billing procedure for tenants.

The PV array would need to have an annual yield of approximately 3,200kWh/yr. This may require an

array of approximately 16 to 21 m², depending on the orientation of the array and the manufacturer’s

panel specification.

V20 LV Distribution

The incoming supply shall be coordinated with the 400A TP&N LV panel board (as Schneider),

located within the ground floor electrical room. Refer to the LV schematic regarding the design intent

of the LV panel board, which shall be provided with 25% spare ways. Transient surge arrestor units in

accordance with BS EN 62305-4.

The installation shall be designed and installed to BS 7671 and all other relevant standards and sub-

main services will be provided comprising XLPE/SWA/LSF cabling. Multi-function meters will be

provided to accord with Part L of building regulations.

All sub-main supplies shall be wired in XLPE/SWA/LSF cabling on combined cable tray through

electrical service risers and ceiling.

Final circuits will be installed in trunking (exposed or with ceiling voids), with steel conduit drops to

socket outlet / accessory positions. All final cabling will be LSOH single core.

Generally the following containment will be provided throughout the building, as part of the CAT-A

works (on floor and within the risers). Also refer to the containment layouts:

• 100mm x 100mm LV trunking – Serving small power circuits from the local distribution boards

• 50mm x 50mm security trunking

• 150mm to 600mm cable tray – serving LV submains, recessed downlights and fire alarm

cabling, either individual or combined.

• 150mm – 450mm basket serving data cabling. Note that this is provided within the tenant’s

risers, where the tenant shall install their own data basket within the floor void as part of their

CAT-B fit-tout works.

Metering shall be provided in accordance with Part L and CIBSE TM39. The LV panelboard shall be

provided within the following meters:

• Part L energy meters to outgoing supplies

• MID approved meters to the 4No tenant’s supplies, to facilitate sub-billing.

• Multifuction meter allowing monitoring of kW, kVA, kVAr, Amps, Voltage and frequency across

all three phases to the incoming supply.

Landlord and Tenants distribution shall be provided. Distribution boards shall be 3 phase, 400V,

suitably rated with adequate outgoing ways (including spare capacity) and be of the miniature circuit

breaker (MCB) pattern with integral isolator and three phase and neutral circuit configuration.

The Landlord’s split-metered distribution boards serving common areas

• Reception

• WCs

• Kitchen

• General and Cleaner sockets

• Electric Heating

Tenant/s split and sub-metered distribution boards serving the Cat-A office, but limited to the following

services (CAT-A):

• NVHR units




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• Cassette units

• Lighting control modules, located above cable tray.

Small power to low level sockets, power grommets and floor boxes shall be part of the Tenant’s fit-out

works.

Earthing and Bonding

Earthing and bonding shall be designed to comply with the relevant British Standard and the

requirements of both BS 7671 and BS 7430. All metal work including pipework, ductwork, drainage,

cable containment etc. shall be bonded to earth and provided with equipotential earth cross bonds.

Both the raised access floor and suspended ceiling grid shall also be bonded to earth. Earth bars shall

be provided within the comms room, risers and LV room.

V21 General Lighting and Control

Lighting throughout the Incubator2 development shall comprise LED luminaires throughout and shall

consider the architectural aesthetic, maintainability and ease of sourcing replacements. All luminaires

are to be agreed with the Design Team and Client.

The complete lighting installation shall comply with the requirements set out in the Code for Interior

Lighting published by the Chartered Institution of Building Services Engineers (CIBSE) and BS EN

12464-1:2011 – Lighting of indoor work places.

The installation shall be designed and installed in accordance with Part L and all other relevant

Building Regulations. The installation shall be designed and installed to BS 7671 and all other

relevant standards.

Landlord and tenancy areas shall be kept separated from each other and fed from appropriate

distribution boards, where cabling shall be supplied from LSF cables in conduits.

An addressible lighting control system (as Ex-or, Simmtronic or equal) shall be provided throughout

the building to allow central control if a single tenant occupied the building and allow flexiblity for the

restack works within the office areas. The system shall facilitate daylight dimming to luminiares within

3m of the perimeter façade, presenence / absence detection throughout, photocell and time clock.

Lobby / Break out Space

The ground floor entrance and break out space proposals shall be developed in accordance with the

architects design and CIBSE guidance. The lobby shall be illuminated using recessed downlights,

which shall be controlled via a scene set system and dimmable control gear.

The entrance consists of glazed walls with a doorway leading to the Atrium, a double height space

with industrial style pendant luminaires suspended from the first floor ceiling.

V21.1 - Entrance Lighting Scheme

The break out space also be accessed from the entrance, illuminated using an array of recessed

downlights in order to maintain consistency.

This theme is continued throughout the majority of circulation areas, in particular the corridors.

Luminaires in the central corridor space are controlled using the lighting control module (LCM), which

facilitates scene setting / dimming.

V21.2 - Proposed luminaires for the double height Entrance




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V21.3 - View of Atrium and Break Out Area from the entrance

Open Plan Office Areas

The CAT-A open plan office scheme shall feature high quality suspended linear LED luminaires with

dimmable control gear. These shall be mounted perpendicular to the façade and shall achieve 350 –

450 lux and a uniformity above 0.6. In addition, the luminaires around the perimeter of the space shall

have dimmable control to enable daylight linking to be provided. All luminaires shall also be provided

with dimmable control to enable individual control by the occupant.

V21.4 - Open Plan Office Lighting Levels, Based on the Above Array

Whilst cellular spaces are not provided as part of CAT-A works, the lighting array shall be provided to

accommodate this flexibility. The lighting control to these luminaires shall be fully addressable to

prevent the requirement for re-wiring. Each cellular space shall be provided with 2 separate 6 x 3

arrays of suspended linear luminaires with a grey finish. Each array can be further subdivided into 2x3

modular arrays which are controlled via separate LCMs, allowing for flexibility of a cellular office

layout. Office areas also incorporate PIR/PD detectors for presence and daylight linking .

ETAP Lighting R7 - separate ETAP U7 - continuous

V21.5 - Proposed open plan office suspended luminaires

The central corridor space between the two arrays shall feature downlights recessed into galvanised

steel cable trays, further accentuating the overall industrial theme.

V21.6 - Proposed open plan office lighting array. The cable tray section contains recessed downlights

Illuminated non-maintained exit signs shall be located by the emergency exit doors at the end of the

notional corridor, mounted from the cable tray.

The lighting installation shall comprise an intelligent addressable control system and allow the control

of luminaires via presence detectors (PIR), override switches, photocell and timer. The lighting control




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system shall be interfaced to the fire detection and over-ride shall be provided in defined locations and

at the reception desk.

In the open plan office the luminaires shall generally be held on, via time clock control, during

standard working hours and then switched in ‘blocks’ by presence detection outside of these times.

Outside of normal working hours a ‘notional corridor’ shall be programmed and this shall be kept

illuminated when any area is occupied.

Meeting Rooms

The first floor meeting room shall feature recessed downlights featuring a suspended halo-like

pendant fitting in the centre of the room. The downlights on their own provide sufficient lighting levels

in accordance with the relevant building regulations. The pendant luminaire is added as a decorative

feature. In its off state, the centre of the pendant is transparent and therefore does not impair visibility.

The meeting room shall provide local scene set switching capability.

V21.7 - Proposed meeting room lighting scheme

Store / Plant Rooms / Risers

Modular ‘batten type’ luminaires shall be provided in these areas and shall be controlled with via

presence and an override switch.

Communications Room

The communications room shall surface mounted batten type luminaires and controlled via an

absence and manual override switch.

WC and Shower Areas

WCs and showers shall feature decorative recessed downlights within the suspended ceiling.

Luminaires within the showers shall be IP 64 rated to provide moisture protection. Both areas and the

adjacent lobbies shall be controlled with presence detectors from the lighting control system.

V22 Small Power

A complete distributed system of low voltage power shall be provided throughout the buildings at

400V TP&N and 230V SP&N for connection to portable equipment, via socket outlets and fixed

equipment. Specific items of fixed equipment provided with dedicated supplies shall be as follows:

• Fire alarm system

• Provision for future intruder alarm system

• Provision for future access control system

• Mechanical services equipment

• Data racks

• Kitchen Equipment

Final outlets to be positioned to Part M.

Circulation spaces shall consist of accessories flush mounted into walls and finished with a brushed

stainless steel MK type face.

All accessories within plant and store rooms shall be stand-alone metal clad surface mounted with

galvanised conduit/trunking.

Single gang, unswitched socket outlets shall be provided to all circulation areas for cleaning and

maintenance purposes. Distribution of outlets will based upon coverage by maintenance equipment

on a 10m lead. These will be protected by a 30 mA RCD.

Final circuit wiring shall be based upon ring or radial topologies dependent upon circuit requirements.

In either case the maximum number of twin socket outlets per circuit will be 10. All power circuits shall

be derived from local distribution boards fed via appropriately sized MCB’s. Circuits will be wired in

ring or radial format as necessary with local RCD protection to be supplied from local distribution

boards where required.

All circuits shall be wired utilising 6491B cables (Cu/LSF singles) installed within galvanised conduit

and trunking systems routed from the distribution boards.




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All small power circuits will be supplied from final circuit distribution boards and separately metered.

Power will be provided at high level to serve NVHR and cassette units. Lighting LCM circuits will also

be provided at high level on a separate circuit. These will be supplied via a fused connection unit fed

form the distribution board in the risers.

Allow for 3No. 3-compartment screed floor boxes to the entrance area to facilitate a future reception

desk. These floor boxes shall accommodate 2No. double socket outlets and 4No. RJ45 outlets. Allow

CAT6A cabling to be routed to the first floor comms room to serve these outlets.

Power to the comms room cabinets will be distribution at high level on suspended galvanised tray /

basket via BS60309-2 outlets. Coordinate fused connection units with the local DX unit and ancillary

services from the dedicated comms room distribution board.

Isolators and accessories serving the external roof plant are to be weatherproof and derived direct

from the ground floor panel board (condensers) or from the local distribution board.

V32 Uninterruptable Power Supply (UPS)

Provide a tender option for 2No. 3kW stand-alone rack mounted UPS modules with 10 minutes

autonomy, to facilitate a managed shut down of comms equipment in the event of a mains failure. The

supply to the UPS shall be derived from the dedicated comms room distribution board within the room

via high level 16A BS 60309-2 commando outlets. Ensure the heat gains from the UPS modules are

coordinated within the mechanical cooling system.

V40 Emergency Lighting

Emergency luminaires shall be provided as required by BS EN 1838, BS EN 50172 and to the local

authorities requirements. The emergency lighting system shall be designed to operate for a period of

3 hours and shall be of category M3.

Emergency lighting key switches to be provided within the local risers.

V41 External Lighting

Refer to the Peter Brett Associates information for the External Lighting Requirements.

W10 Telecommunications

Coordinate ducting for incoming telecoms services into the comms racks.

Telephony services shall be provided to serve the lift dial and fire alarm dial-out and future reception

telephone line.

All other telecommunications services are to be provided as part of Tenant’s fit-out as required.

W14 Disabled WC / Shower Alarm System

A disabled toilet alarm call system shall be provided to all disabled toilets to comply with BS 8300.

The system shall comprise local call cords, remote reset units and over-door indicators, with the

facility for monitoring via BMS

W15 Information Technology

Allow 2No. 42U 800x800mm ICT racks within the comms room. Ensure at least 1000mm access is

provided on both sides of each rack.

IT equipment (racks, servers, patching switches, WIFI routes) are to be provided by a separate

contract / as part of Tenants’ fit-out.

W30 Information Technology Cabling

Allow IT cabling from the comms room to data points within the landlord’s areas are to be CAT6A.

Allow for an additional 10No. RJ45 points and data cabling for tender purposes services within the

landlord areas to serve potential WIFI routers / additional data points.

W40 Security

Dedicated security containment shall be provided to allow the future tenant/s to install their own

access control, intruder alarm and surveillance systems if required.

Refer to the containment drawings which outlines the design intent for Security trunking to run

horizontally at high level throughout the building and within risers. This shall originate back to the

ground floor LV room and first floor comms room.

The fire alarm and security drawings reflect the requirements for access control containment around

designated doors.

Underfloor ducts shall also to be provided within the entrance lobbies, to facilitate future access

control and intercom to the entrance doors.




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W50 Fire Alarm and Disabled Refuge

An addressable, open protocol, automatic fire detection system shall be provided in accordance with

BS 5839 Parts 1 & 8. The system shall be designed and installed to achieve a system classification of

L1 (provisionally) and to the requirements of the Building Control authority and Fire Engineer. The

fire alarm and detection system design, equipment, installation and testing shall be BAFE / LPCB

approved. Allow tenant’s areas to be provided from separate loops with 30% spare loop capacity.

The fire alarm panel is proposed to be recessed to the rear entrance. Batteries and chargers to the

system shall be sized to provide sufficient power for 48-hour quiescent operation followed by ½ hour

at full output of sounders.

The fire alarm panel shall be provided with a red-care automatic dial-out facility.

Flashing beacons shall be provided throughout the building areas as required under BS5839 Part 1 to

notify a disabled person in the event of an evacuation.

The fire alarm system shall incorporate break glass units, smoke and heat detectors throughout the

new development. Fire alarm interfaces are to be provided to allow the lift, gas solenoid valve,

ventilation plant to allow this to ground and shut down in the event of an evacuation. The fire alarm

cause and effect shall be configured to meet the developed and agreed fire alarm strategy.

Fire alarm cabling throughout shall be installed on cable tray and within galvanised steel conduit to

the underside of the slab. All fire alarm cabling is to be of the ‘enhanced’ category and be provided

with a red outer sheath and accord with the Building Control Officer’s requirements.

Disabled Refuge

A Disabled refuge system shall be provided to serve all disabled refuge intercom locations as

necessary. The system shall be designed to be compliant with BS 5839, Part 9, with a master head-

end handset located location to be agreed. The system shall be locally battery backed with the facility

to be monitored by the BMS.

W52 Lightning Protection

A lightning protection system shall be provided to the building, with the extent subject to a lightning

protection assessment to comply with BS EN 62305. The air termination network shall utilise the

high-level steelwork or metal roof finish at roof level if suitable. If the roof is non-conductive or not of a

suitable thickness/material, a grid of PVC-coated copper/aluminium tape shall be installed to act as

the conductor. The air termination network shall be concealed wherever possible and linked to the

down-conductors, which shall be the steel reinforcing cage within the columns/the structural steel

columns. The lift shaft structural steels and guide rails shall also be bonded back to the lightning

protection system. The down-conductors shall terminate at earth via an earthing termination network

(eg the piled foundation), with a number of reference points installed around the external ground floor

area for maintenance and testing of the system.

Surge protection shall be provided to the building electrical installation, to a level required to meet the

lightning protection risk assessment.

X10 Machine Room Less Lift

An 8 person, 630kg, type 2 lift shall be provided to accommodate one wheelchair user and an

accompanying person shall be provided to serve ground and first floor.

Type 2 ensures accessibility to persons using a manual wheelchair described in BS EN 12183 or an

electrically powered wheelchair of class A or B described in BS EN 12184.

Particular attention to the selection and location of lifts shall be required to ensure compliance with the

Disability Discrimination Act (DDA) 1995. The method implemented by the lift industry to comply with

DDA is BS EN81-70:2003 and this European standard sets out the minimum car dimensions to

accommodate class A, B and C wheelchairs.

Lift Dimensions

A resultant car size of 1200 mm wide x 1400 mm accommodates one wheelchair user and several

other users, which also allows adequate space for a wheelchair to be rotated within the lift car. This is

partially important where only one car entrance exists.

The lift pit depth for the specified lift shall be 1650mm x 1750mm x 1250mm depth.

The lift overrun height (headroom height for safety gear on counterweight) shall be 3600mm (Source:

Schindler 3300 elevator product brochure).

Lift Finish

The lift finish shall be based on the existing Incubator Building 10 person lift, as Schindler 3300 or

equal.

The specified lift shall have brushed stainless steel doors and trim, complete with a mirrored back

wall and floor finish matching the entrance foyer.




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Handrails are to be aluminium brushed handrail

Lift handrail with brushed aluminium finish – Similar to the Original Incubator

The internal lighting within the lift shall be agreed with the Architect and Client. For tender purposes,

allow the lighting to feature ceiling lines.

Lift lighting arranged as ceiling lines




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7. Sustainability

A thermal model of the Alconbury Weald Incubator² building was built using IES Virtual Environment

2015. The thermal model was based on the drawings received from Allford Hall Monaghan Morris

Architects on 24th November 2016. Initial Part L compliance simulations were run to assess the

performance of the current design against the energy and carbon emission targets for the project,

outlined in Alconbury Weald KP1 Sustainability Statement and in the project brief:

• The Building Emission Rate (BER) exceeds Building Regulations Part L 2013

• A minimum 10% energy generation through on-site Low or Zero Carbon (LZC) technologies

as required by the East of England Plan (EEP) Policy ENG1: Carbon Dioxide Emissions and

Energy Performance. However, please note that the EEP no longer exists and therefore this

requirement is not mandatory.

Figure 10.1: IES model of Alconbury Weald Incubator² building

The results of the initial Part L simulations, with and without meeting the 10% energy generation

through on-site LZC technologies, are detailed below including the Building Emission Rate (BER),

Part L 2013 Target Emission Rate (TER), the percentage improvement of the BER upon TER and the

contribution from the proposed photovoltaics (PV) panels.

Photovoltaic (PV) panels A PV array has been included in the calculations in order to comply with Part L only (as agreed with

the Planning Consultant and the Client). The PV array would need to have an annual output of

approximately 3,200kWh/yr. This may require an array of approximately 16 to 21 m², depending on

the orientation of the array and the manufacturer’s panel specification.

Fabric performance The table below details the fabric performance figures that are proposed to be targeted (used in the

thermal model) in comparison with the Part L 2013 acceptable and notional values

Part L Summary To summarise, these are the key points discussed in this document:

• The current design would exceed Building Regulations Part L2A 2013 with the use of a small

PV array, achieving approximately a 0.4% improvement upon Part L.

• A PV array generating 3,200kWh/yr is required, equating to an array of approximately 16 to

21 m², depending on the orientation of the array and the manufacturers panel specification.

• Please note that the architectural design has developed since this analysis to be less onerous

on energy consumption (due to reduced glazing). The analysis shall be updated at the next

design stage.

Figure 10.2: Carbon emissions breakdown for Part L compliance figures

BER (kgCO2/

m2)

Part L 2013 TER

(kgCO2/m2)

Improvement upon Part L

PV array

Annual output

Indicative Area

Without PV 24.3 23.4 Failing to

Comply - -

With PV to pass Part L 23.3 23.4 0.4% 3,200kWh 16 – 21 m²

With PV to meet 10% 21.0 23.4 10.2% 10,720kWh 60 – 70 m²

Element U Values (W/m2.K)

Acceptable Limit Notional Building Proposed Design

Walls 0.35 0.26 0.18

Roof 0.25 0.18 0.15

Floors 0.25 0.22 0.20

Windows/Translucent curtain walling (including frame)

2.2 1.6 1.4

(G Value = 0.4)

Louvres/Opaque curtain walling (including frame)

2.2 0.26 1.2

Air Permeability (m3/m2.hr) 10 3 3




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Solar Shading on South Façade A preliminary solar shading analysis has been carried out using IES Virtual Environment to quantify

the amount of solar radiation received by the south, east and west facades, assess the effectiveness

of the brise-soleil included in the current design and identify the areas where further solar shading

should be installed to diminish solar gains and reduce the risk of overheating. Currently 1800mm deep

brise-soleil has been incorporated in the architectural design. The drawings were received from Allford

Hall Monaghan Morris Architects on 21st of November 2016.

Various brise-soleil systems have been compared and their performance in terms of reducing solar

gains has been evaluated. The following options have been examined:

1. Baseline scenario: Horizontal brise-soleil, depth 1800mm.

2. Option A: Horizontal brise-soleil, depth 1000m.

3. Option B: Vertical brise-soleil, length 1000m.

The analysis concluded that the baseline scenario should be retained for the brise-soleil above the

first floor offices with a combination of Option A or B for the ground floor offices. The Architect

developed the ground floor brise-soleil allowance to be in line with the Option A proposal.

Figure 10.3: Option A, Solar irradiation on the south facade of the building, from 1st May to 30th September

Figure 10.4: Option A, Solar irradiation on the north facade of the building, from 1st May to 30th September

Sun Path Images The images below show the solar angle at 12 noon on 21st June, 21st September and 21st

December (top to bottom). These images illustrate that the installation of brise-soleil in the south

facade shall not only reduce the undesired solar gains during summer period (due to high summer

sun), but shall also allow low-level winter sun to enter the building during winter period, which can

contribute to the reduction of the space heating demand.

Figure 10.5: Sunpath on 21st June




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Figure 10.6: Sunpath on 21st September

Figure 10.7: Sunpath on 21st December




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APPENDIX A - LUMINAIRE SCHEDULE




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APPENDIX B - MECHANICAL, ELECTRICAL AND PUBLIC HEALTH DRAWINGS 2601167-HL-XX-XX-SM-M-560-0010 Space Heating and Cooling Schematic

2601167-HL-XX-XX-SM-E-600-0010 Electrical LV Schematic

2601167-HL-XX-XX-SM-P-523-2310 Above Ground Foul Drainage Schematic

2601167-HL-XX-XX-SM-P-525-2510 Rainwater Drainage Schematic

2601167-HL-XX-XX-SM-P-532-3210 Domestic Water Services Schematic

2601167-HL-XX-GF-GA-U-500-2000 Combined Services Layout, Ground Floor

2601167-HL-XX-FF-GA-U-500-2001 Combined Services Layout, First Floor

2601167-HL-XX-RF-GA-U-500-2002 Combined Services Layout, Roof Level

2601167-HL-XX-GF-GA-M-560-5000 Space Heating and Cooling Layout, Ground Floor

2601167-HL-XX-FF-GA-M-560-5001 Space Heating and Cooling Layout, First Floor

2601167-HL-XX-GF-GA-M-570-7000 Ventilation Layout, Ground Floor

2601167-HL-XX-FF-GA-M-570-7001 Ventilation Layout, First Floor

2601167-HL-XX-GF-GA-E-600-0000 Power and Containment, Ground Floor Layout

2601167-HL-XX-FF-GA-E-600-0001 Power and Containment, First Floor Layout

2601167-HL-XX-GF-GA-E-630-3000 Lighting and Control Layout, Ground Floor

2601167-HL-XX-FF-GA-E-630-3001 Lighting and Control Layout, First Floor

2601167-HL-XX-RF-GA-E-690-3002 Combined Electrical Services Layout, Roof Level

2601167-HL-XX-GF-GA-E-650-5000 Fire Alarm and Security, Ground Floor

2601167-HL-XX-FF-GA-E-650-5001 Fire Alarm and Security, First Floor

2601167-HL-XX-GF-GA-P-523-2300 Above Ground Foul Drainage Layout, Ground Floor

2601167-HL-XX-FF-GA-P-523-2301 Above Ground Foul Drainage Layout, First Floor

2601167-HL-XX-RF-GA-P-523-2302 Above Ground Foul Drainage Layout, Roof Level

2601167-HL-XX-GF-GA-P-525-2500 Rainwater Drainage Layout, Ground Floor

2601167-HL-XX-FF-GA-P-525-2501 Rainwater Drainage Layout, First Floor

2601167-HL-XX-RF-GA-P-525-2502 Rainwater Drainage Layout, Roof Level

2601167-HL-XX-GF-GA-P-532-3200 Domestic Water Services Layout, Ground Floor

2601167-HL-XX-FF-GA-P-532-3201 Domestic Water Services Layout, First Floor

END OF REPORT

Documents

Employer’s Requirements Outline Specification February 2017 · 2017. 2. 20. · ALCONBURY WEALD – INCUBATOR² MECHANICAL, ELECTRICAL AND PUBLIC HEALTH SYSTEMS – EMPLOYER’S