cn,gy,vh,M&E Building Services Design Philosophy...CN/GY/VH/NW6393/H3 (19 October 2010) – Ponsonby...

$: cn,gy,vh,M&E Building Services Design Philosophy...CN/GY/VH/NW6393/H3 (19 October 2010) – Ponsonby House g:\current jobs\nw6393\h - minutes of meetings and reports\h3 - rwg reports\cn,gy,vh,m&e$
CN/GY/VH/NW6393/H3 (19 October 2010) – Ponsonby House g:\current jobs\nw6393\h - minutes of meetings and reports\h3 - rwg reports\cn,gy,vh,m&e building services design philosophy.doc Planning & Development 1

PONSONBY HOUSE STOCKPORT CIVIC OFFICES BUILDING SERVICES DESIGN PHILOSOPHY AND RESIDUAL RISK STATEMENT OCTOBER 2010


GENERAL This document describes the building services philosophy that has been installed at Ponsonby House, Stockport Civic Offices. Building Description & Services Overview The building is a 5 storey (and basement) predominantly office accommodation with One Stop Shop at ground floor, situated on the existing site Ponsonby House Stockport, adjacent to Stopford House and next to the Town Hall. The building is a steel frame arrangement with concrete floors and roof. The plant is located predominantly at roof level with also a basement housing the water tanks. The air cooled chillers and air handling plant are external units with the LV switchroom and plate heat exchangers located internally. The building has a raised floor for power and data with a suspended ceiling housing the mechanical services and lighting systems. 1.0 MECHANICAL 1.0.1 STANDARDS The installation has complied with :- (a) NICEIC Regulations and Recommendations (b) The Factories Act (c) The latest relevant British and European Standards and Codes of Practice (d) The Building Regulations with all current amendments (e) The Health and Safety at Work Act and all current amendments (f) Construction Design Management (CDM) Regulations : 1994 (g) The Regulations and Requirements of the Local Environmental Health Department (h) CIBSE Design Guides (i) Any Local Regulations (j) The Electricity Supply Act (k) The IEE Regulations for the Electrical Equipment of Building BS 7671 (l) The Requirements of the Local Authority Building Control Officer (m) The Local Authority Fire Officer (n) The Requirements of the Insurance Company (o) The Electricity at Work Regulations (p) BSRIA Guides (q) DDA Regulations


1.0.2 MECHANICAL ENGINEERING SERVICES – PARAMETERS (a) Temperatures

External : Summer (Maximum) Winter (Minimum)

CIBSE Guide 28°C d.b. / 20°C w.b. -4°C Saturated

Open Plan Office/Meeting Rooms Indoor : Summer (Maximum) Winter (Maximum) No humidification control

24oC d.b. ± 2oC ± Control Band

22oC d.b. ± 2oC

Stairwells Indoor : Summer Winter (Minimum)

No Control 18oC (heating only)

Toilets Indoor : Summer Winter (Minimum)


Corridors Indoor : Summer Winter


(b) Ventilation

Fresh Air Requirements 12 litres/sec/person ‘NO SMOKING’ (c) Noise Levels

Offices NR38 Manager’s Office/Individual Offices NR35 (fit out) Meeting Rooms NR35 (fit out) Toilets NR40 Corridors NR40

(d) Heat Gains

Office Equipment 25 W/m2 Lighting 12 W/m2 Occupants 80 W/person sensible heat gain


(e) Occupancy Levels

1 person/8m2 base build (f) Air Change Rates

Offices min 4 ac/hr Toilets min 10 ac/hr Fresh Air 12 litres/sec/person

1.0.3 MECHANICAL ENGINEERING SERVICES – GENERAL DESCRIPTION The Mechanical Engineering Services generally consist of the following which are detailed in subsequent sections :-

i. Chilled Water System. ii. Low Temperature Hot Water (LTHW) system & Plate Heat Exchangers. iii. 4-Pipe Fan Coil Unit system. iv. Fresh Air Ventilation. v. Toilet Ventilation. vi. Domestic Water Services. vii. Miscellaneous Ventilation. viii. Above Ground Drainage. ix. Automatic Controls and Building Management System. x. Rainwater Collection System. xi. WC Overflows. xii. LTHW Overdoor Heater. xiii. Variable Speed drives on air handling plant. xiv. Sanitaryware xv. Trace Heating. xvi. Seasonal Commissioning all systems. xvii. Condensate Drains & Pumps, Sump Pump. xviii. Refrigerant Cooling

The building is essentially heated by a 4-pipe fan coil system fed from air cooled chiller mounted on the roof and LTHW heating fed from a remote boiler room within Stopford House. Domestic hot water is from a central system (with electrical back up) fed from the LTHW. The building has a rainwater collection system within the basement area and a boosted cold water supply and storage system. 1.0.4 CHILLED WATER SYSTEM Chilled water is provided by 2 No. chillers, located in the external plant compound, each sized at 66% of the building design load. The chillers are air-cooled chillers, complete with fully automatic controls, integrated with the Mechanical Control Panel.


All external pipework in the roof area is trace heated. 1.0.5 REFRIGERANT COOLING Comms rooms are located at each level of the building. Wall mounted cooling units with individual room controllers are provided, linked to a common condenser at roof level. 1.0.6 LOW TEMPERATURE HOT WATER (LTHW) SYSTEM LTHW is be provided by 2 No. plate heat exchangers located in the Rooftop plantroom, each sized at 66% of the building design load. The primary LTHW heating to the plate heat exchangers is fed from a new boiler system installed in Stopford House (separate contract to the Ponsonby House). LTHW Secondary pumps incorporate variable speed drives, serving a variable volume LTHW System (2-Port control), distributing throughout the building to Fan Coil Units, Fresh Air Handling Units No.1 and No.2, toilet and stairwell radiators and ground floor overdoor air curtain. Differential control valves have been installed, where appropriate, to provide satisfactory valve authority and limit 2-port valve noise. The LTHW distribution system has been designed with adequate provision for pipework expansion. 1.0.7 4-PIPE FAN COIL UNIT SYSTEM The office spaces and One Stop Shop are be heated and cooled by 4-pipe Fan Coil Units (FCU’s) served by the LTHW and Chilled Water systems. Fan Coil Units are the chassis type, water-side 2 port controlled, concealed units containing heating and cooling coils, centrifugal fan, drip tray, condensate drain, filter and acoustically lined plenum box to the discharge outlet. Fan Coil Units are concealed within the suspended ceiling space, with discharge ductwork serving perforated face diffusers complete with acoustically lined plenum boxes. Return air to Fan Coil Units is via a combination of air handling light fittings and return air grilles. Fan Coil Units utilise gravity condensate drain (copper pipework). Fresh air to meet the occupants requirements has been supplied to the ceiling void to the rear of each Fan Coil Unit, mixing with return air extracted from the room.


1.0.8 FRESH AIR VENTILATION SYSTEM Fresh air to meet the office and One Stop Shop occupants requirements are provided by 3 No. externally mounted central air handling units. Supply air is distributed to the rear of each Fan Coil Unit. For the office areas, extract air is drawn from the ceiling void by bellmouth extract ducts off Cores 1 and 2, using the ceiling void as a common return air plenum. For the One Stop Shop, extract air is ducted to rooms. Noise sensitive rooms have cross talk attenuators to both supply and extract ductwork serving these rooms. The air volume extracted is marginally less than the supply air (after deducting make-up air to Toilets) to ensure that the office area is notionally pressurised. This minimises leakage and draughts around the fenestration. The 2 No. central AHU’s is served by the LTHW and Chilled Water circuits, with the 3rd AHU (Ground Floor) with LTHW, each incorporating a heat recovery recuperator in order to obtain beneficial heating from the extracted air. In line and cross talk attenuation has been provided to meet noise criteria. Fire and Smoke Dampers The fire strategy for the building is 60 minute fire compartments at each floor. In accordance with the Building Regulations Part B, fire safety automatic motorised fire/smoke dampers are incorporated. Damper types are smoke/shield PTC and CSS Damper for spiral wound ductwork with allowance for all necessary fixings, actuators and interfaces. A computerised Intelligent Damper Control and monitoring system is provided. Small Extract Fans Extract ventilation fans are provided to lift shafts, LV switchroom, roof plantroom and basement plantroom. 1.0.9 TOILET VENTILATION 2No. rooftop mounted run and standby extract fans provide extract to the toilet areas. Vertical ductwork drops via dedicated risers with horizontal ductwork serving each toilet area. Fans have run/fault/enable via the BMS. A PIR at each level activates the fan to ramp from trickle ventilation to boost.


1.0.10 DOMESTIC WATER SERVICES A single cold water supply enters the building and serves a cold water storage tank and booster set located in the Basement area. The water storage tank provides 4 hours of storage. The Boosted Tank Cold Water System (BCWS) then serves the following :- (i) Core Toilets and wash-hand basins, showers and cleaners sinks. (ii) LTHW and Chilled Water Pressurisation Units. (ii) Top up for the rainwater collection tank. The booster tank is a split tank for maintenance purposes incorporating warning pipes and overflow system accordingly. Sanitary Shut Off Valves Sanitary shut off valves are incorporated to meet the requirements of BREEAM. Wiring

• The rainwater risers have a single valve with PIR’s wired in parallel. • The boosted cold water system has a valve and PIR at each level.

Hot Water Indirect water heater incorporating a high-grade carbon steel vessel, protected with ULTRA COAT glass lining, insulated with removeable high density CFC free foam insulation silver melamine jacket. Standard features include sacrificial magnesium anode for maximum protection from corrosion, clean-out access plates for waterside maintenance, temperature gauge, 2 high recovery indirect coils. The lower coil is served from a solar hot water system, the upper via the LTHW system. The solar system comprises 12No. external panels mounted on the south face, roof level, designed to provide 30% of the building’s hot water consumption. Water boilers are mounted above sinks in tea rooms. Showers Showers are DDA approved in addition to having a suitable flow restrictor to 6 litres/min fitted between the shower hose and shower valve body to meet the requirements of BREEAM.


1.0.11 ABOVE GROUND DRAINAGE The toilet and tea room areas are provided with an Above Ground Soil & Waste Drainage system, designed to meet current statutory requirements. The drainage system also provides for drainage of condensate from the Fan Coil Unit system. 1.0.12 RAINWATER HARVESTING The rainwater harvesting system includes the following: 1 x 31.85m3 Rainwater Collection / Storage Tank complete with access chamber 900mm

diameter to house all recycling components and 110mm Access Inspection Pipe.

1 x RWHU/10 Rainmanager system plus expansion vessel (100 lts capacity)

Calmed inlet, overflow siphon 1 x Commercial In-line Filter unit 1.0.13 AUTOMATIC CONTROLS AND BUILDING MANAGEMENT SYSTEM The Building Management System (BMS) is has been provided by Impact Controls. The Automatic Control and Building Management System (BMS) is a microprocessor based system, comprising stand-alone intelligent outstations which controls and monitors the services installation, connected by a digital communication network. A front end PC is provided, which is 100% IBM compatible and capable of connecting to any node on the network. The PC interface enables the operator to interrogate and modify the system operation, settings etc., without the involvement of a Controls Manufacturer. The PC interface permits the end user to monitor all aspects of the mechanical services systems, as well as internal and external environmental conditions. The system is capable of extension by the Tenant. The system software provides :-

• Priority based alarm handling.

• Historical data files.

• PID control loops. • Fixed time and optimum start/stop control of plant, with self learning capabilities.

• Password security access.


• Modem for off-site monitoring. The control software is set up to minimise energy consumption and, where possible, monitors the energy consumption of the services installation. Fault indication is provided for all connected plant items, with appropriate override facilities at the front end PC. The system provides control / monitoring of the following Mechanical services systems :- Full Control & Monitoring is provided to the following :-

• LTHW Reciprocators and Pumps

• Chilled Water Pumps

• Air Handling Units

• Dirty Extract • Fan Coil Units

• Power Supply Status

• Lift Motor Room Extract

• Switchroom Extract • Water Tank Room Extract Enabling and general fault indication is provided to the following, each having its own self-contained controls :-

• Chillers

• HWS Generators

• Cold Water Booster Set • Trace Heating

• LTHW and Chilled Water Pressurisation Units Monitoring is provided to the following :-

• Lifts

• Fire Alarm

• Water Tank High/Low Levels

• Water Tank High/Low Temperatures • Intruder Alarm Fault

• Energy Meters


DEDICATED ENERGY METERS Dedicated meters are provided to the following areas linked to the BMS for ½ hourly read outs. (i) Incoming LTHW Heating from Stopford House. (ii) Chiller Power. (iii) Solar Thermal Hot Water (iv) Hot Water Usage. (v) Incoming Water. (vi) Rainwater Collection. (vii) Chilled Water Usage. Ponsonby Building - Roof Plant room Control Panel MCP 01 Indicator lamps & labels are provided on the control panel fascia identifying the control function and the item of plant that they are associated with the panel and serve the following plant:- Heating Plant The primary pumps within Stopford House & in the roof plantroom are enabled along with the respective pumps serving the AHU plant & fan coils or the Dhws should there be a demand from any of the time channels, frost protection system or the optimiser programme. Water from the Stopford House plantroom is fed to plate heat exchangers within the roof plantroom where water is circulated to a low loss header arrangement via a primary pumpset. Temperature sensors located in the common flow pipe & return monitor the water temperature from the heat exchanger to maintain the set flow temperature as required when the heating system is enabled. The return water sensor is also utilised under frost protection. The pressurisation unit is interlocked with the heating plant, upon a high or low-pressure condition then the pumps will be disabled until reset. Fed from the header are two individual circuits a constant temperature one serving the AHU heater batteries & fan coils & a Dhws primary one, these are controlled as follows: The CT circuit twin head pump set provides water at a constant temperature to the AHU heating coils & fan coils when the time zone for these is enabled or under frost protection. DHWS A separate twin head pump set provides water at a constant temperature a DHWS cylinders the pump is enabled from the time channel within the outstation dedicated to the domestic hot water. The secondary water temperature is controlled to a set point of 65oC this is achieved by modulating the 3 port control valve on the cylinder in accordance with the sensor located within the cylinder. A manual reset high limit thermostat located at the top of each cylinder is set to 70oC and operates if the cylinder rises above this temperature. Upon activation of the thermostat the cylinder control valve is driven to the divert position until the thermostat is manually reset. Water is pumped around the domestic hot water circuit via a single head pump.


Pumps General All pumpsets are be provided with an autochangeover facility and weekly rotation program. Pumps will changeover on a trip condition or when the flow switch senses no flow when the duty pump is required. Cold Water Booster Set The packaged cold water booster set is permanently supplied via the control panel & monitored for fault condition. Within the twin tank level switches are provided for remote alarm indication purposes as well as temperature sensors, which will raise an alarm should the water temperature rise above the set limit. Sub Metering The BMS system accepts the volt free pulses from various sub meters through out the building including two electric meters on the main electrical switchboard which serve the chillers. In addition the lighting & main power distribution boards are monitored from the on board electric sub meters. Frost Protection Frost protection of the plant is controlled in three stages as follows: Stage1: If the outside air temperature falls below 2oC then all pumps will start and the control valves fully opened. Stage2: If the outside air is still below 3oC and the return water temperature falls below 10oC then the boiler plant will be enabled. Stage3: If the space temperature falls below 10oC then the boiler plant will be enabled. Chilled Water Plant The chilled water plant is also be controlled from new control panel. The two chillers are sequence controlled to achieve a flow temperature set point of 6oC as sensed by the flow temperature sensor. This water will be circulated to a buffer vessel via chillers own hydraulic sets. A temperature sensor located in the common return pipe monitors the water temperature. A separate twin head pump fed off the secondary side of the buffer vessel provides the chilled water to the AHU & FCU cooling coils. The pressurisation unit is interlocked with the chilled water plant, upon a high or low-pressure condition then the boilers will be disabled until reset. AHU Nos 1 & 2 General Ventilation The AHUs are fitted with a fresh air inlet & extract air damper actuators with auxiliary contacts which is interlocked with the AHU fans. The AHUs provides tempered fresh air by means of heating & cooling coils with 3 port control valves & a thermal wheel. The heating control valve & thermal wheels are modulated in sequence to maintain a set temperature (adjustable) as sensed by the supply air & (low limit) temperature sensor located after the supply air fans.


A capillary thermostat latticed across the downstream face of the frost coils will disable the supply fan on sensing an off coil temperature of less than 5oC a lamp will also be illuminated on the control panel facia. Fitted across the three filter media are differential pressure switches which indicate when the filter media is blocked & a lamp will illuminate on the control panel. The supply air fans are fitted with a differential pressure switch which will prove air flow of the supply fan. The supply & extract fans are inverter driven to maintain a static pressure within the duct work as sensed by the static pressure sensor. The sensors control the inverters in response to drops in duct pressure as the various zones on the ground to fourth floors become occupied. Each floor is assigned to a separate time zone within the controller which in turn will open the motorised dampers & enable the fan coil units accordingly. Toilet Areas The main WC’s have an associated dirty extract fan which is enabled when the AHU ventilation system is in operation. The fans are to be duty standby & complete with the manufactures autochangeover unit, which is monitored via the BMS System Fan coil units (All floors) Each fan coil unit is provided with a dedicated controller. The controller controls the room temperature to a set point by modulating the heating & cooling coils accordingly to maintain the set point temperature set at the controller via the front end PC or display unit. Fan coil units (First floor Meeting Rooms) The two meeting rooms each have a fan coil unit with a dedicated controller provided by the control specialist the meeting rooms are controlled in conjunction with a separate VAV box controller & room air quality sensor, should the room have a large number of people present when occupied then the air quality sensor overrides the fresh air input on the VAV box to provide more fresh air into the space. Any additional heating or cooling is undertaken via the FCU. The room sensor within the meeting rooms has the facility of temperature adjustment within the room & an occupancy enable push button. Rain water Harvesting System A rain water recovery/harvesting system is provided with its own stand alone control system, the BMS monitors the various level switches & alarms generated by the system to the harvesting systems own control panel. General The fascia mounted Colour display on the control panel provides the user with the facility of locally accessing set points and times for the heating hot water & ventilation plant. The main control panel is interlocked with the building fire alarm system, upon receipt of the signal the ventilation plant will shut down until the alarm signal is reset.


2.0 ELECTRICAL SERVICES 2.0.1 GENERAL This document describes the building services philosophy that has been installed at Ponsonby House, Stockport Civic Offices. 2.0.2 GENERAL DESCRIPTION OF WORKS The extent of the Electrical works installed is as follows:-

− Mains and sub mains distribution

− General lighting and emergency lighting installations and controls.

− Small power installations including underfloor bus bar track and floor boxes − Fire alarm installation

− Data/voice outlets including cabling and containment

− Power supplies to mechanical equipment and control panels.

− Disabled toilet alarm system.

− Intruder alarm system. − Access control system.

− CCTV cable containment

− Lightning protection installation

− Complete UPS system.

2.0.3 MAIN & SUB-MAIN DISTRIBUTION SWITCHGEAR & CABLING • Low Voltage Switchgear The assembly is a CE marked, ASTA certified, multi-cubicle, type-tested assembly (TTA), with Form 4 type 5 segregation to BS EN 60439-1. The main LV panel is floor standing with front access only, top cable entry/exit and be IP31 rated. The assembly is manufactured from high grade, machine folded/welded, zinc coated, sheet steel of not less than 2mm thickness and be provided with a 100mm high (minimum), removable rolled mild steel plinth. Busbars are rated to withstand a minimum of 50KA for 1sec fault current.


The main LV panel utilises moulded case circuit breakers (MCCB), affording the necessary protection for the sub distribution. MCCB's are cubicle mounting type with door mounted padlockable, rotary type operating handle. They are of the fixed pattern with fully shrouded fixed contacts. Interlocks have been provided to prevent the opening of the front cover with the operating handle in the ‘ON’ position. The panel is provided with a main incoming meter capable of displaying accumulative kWh, accumulative maximum demand (kVA), p.f, voltage and current for all phases. Every meter has a pulsed output facility, RS485 serial connection, for connection to the BMS System. All distribution circuit supplies to distribution boards are individually metered. The main panel has P.F improvement to 0.95 capacitors rated at 480V with detuning reactors to allow for harmonic loads, harmonic filtering and surge protection. The PF correction is switchable and in banks of 50 kVAr, total rating to be 100KVAr. Transient overvoltage surge protection is fitted to protect against the effects of voltage disturbances. The panel includes allowance of 25% spare load capacity and facility for extending the installation in the future. • Low Voltage Distribution Cabling XLPE/SWA/LSF cables are manufactured to BS 6724 The armouring for multi-core cables consists of a single layer of galvanised steel wires complying with BS EN 10257-1. Single core cables have non-magnetic armour, such as aluminium wire or strip. Where cables are buried direct in the ground or laid in ducts, they are installed and covered in accordance with the National Joint Utilities Group (NJUG) Standard. Where cables are installed on cable ladder, tray, basket or fixed directly to the building fabric, they are securely fixed in accordance with BS 7671. Where cables are exposed to direct sunlight or extremes of temperature, they are provided with suitable containment or solar shading as appropriate. Cables are installed on either cable tray or cable basket. Cables may also be clipped direct to building fabric in accordance with BS 7671.

• Rising Main Busbars Busbar trunking system is ASTA certified, conforms to BS EN 60439 2 and is capable of withstanding the prospective short circuit currents specified elsewhere. Busbar trunking systems have been designed in accordance with BS 7671 and in particular Appendix 8. Busbar trunking systems have been designed for use as a rising main distribution system. The trunking is located such that the tap-off unit locations are within 500mm of the equipment they are to supply.


Busbar trunking systems comprise a sheet metal enclosure, hard drawn, high conductivity copper busbars and are complete with busbar supports, expansion joints, thrust blocks, fire resisting barriers, and cable terminations. Busbar trunking systems incorporate an integral earth conductor, are electrically continuous throughout their length and have a degree of protection to IP41 minimum. Power tap off units have ‘finger safe’ automatic shutters operated by insertion or removal of a tap off unit. The design of the units ensures that no live metalwork is exposed during insertion or removal and that the unit is connected to earth before contact is made with live busbars. The unit remains earthed during removal until all live conductors are disconnected. Tap-off units incorporate MCCB's.

• Distribution Boards MCCB panel board The panel boards comply with BS EN 60493 and have minimum of form 3b type 2 as standard and are fully certified factory built assembly. With all incoming and outgoing devices already fitted. The panel boards have a high grade sheet steel enclosure and are complete with an integral incoming isolation switch and outgoing moulded case circuit breakers (MCCB’s) rated as per the main LV distribution schematic. MCCB’s comply with BS EN 60947-2, and have a minimum fault breaking capacity of 25Ka and incorporate thermal/magnetic trips. MCB distribution boards The distribution boards comply with BS EN 60493 and are complete with an integral incoming isolation switch. Outgoing protection devices are miniature circuit breakers (mcb) rated as per the distribution board schedules. Miniature circuit breakers have a minimum short circuit capacity of 10KA with an overload characteristic of type B for small power circuits and type C for lighting circuits in accordance with BS EN 60898. Circuits for cleaner’s sockets are protected by combined mcb/rcd devices (RCBO’s) which are double pole.

• Cable containment General Trunking Installation Galvanised cable trunking and accessories manufactured to BS4678 has been used throughout the installation.


Cable Tray Medium-duty return flange galvanised steel cable tray (or suitable rated wire tray) has been used throughout the installation, to form primary routes within voids and risers.

• Wiring methods The following wiring systems have been used. Main electrical supply: - XLPE/SWA/PVC cables routed in under-ground smooth bore 150mm dia upvc cable ducts. Sub-distribution circuit: - XLPE/SWA/LSF cables securely fixed to galvanised steel cable tray or basket routed in the riser and ceiling voids. General lighting and power: - Afumex LSX type cable installed on baskets. Mechanical services: - As sub-distribution circuits and general lighting & power wiring above. Fire alarms: - MICC/LSF or similar and approved fixed to galvanised steel cable tray/basket or clipped direct to the building structure. Security: - LSF insulated cables fixed to galvanised steel cable tray or basket with final connections enclosed in galvanised steel conduit. Comms: - Cable containment for CAT 6 UTP cabling comprising

of galvanised steel cable tray or basket with final connections enclosed in flexible steel conduit.

All cables are BASEC approved and have stranded copper conductors. 2.0.4 EARTHING & BONDING • Consumers Low Voltage Earthing Network The supply arrangement offered by UU is a PME arrangement. An earth conductor cable has been provided from the earthing terminal at the UU LV cabinet to the Main Earthing Terminal (MET) located in riser #3 at ground floor. A main earthing terminal, mounted on insulators, is located in a convenient position in riser #3 at ground floor. The earth bar is rated in accordance with BS 7430 with a minimum size of 60mm x 6mm.


• Main Equipotential Bonding The consumers PME bonding is installed between the earthing terminal and all other incoming metallic services.

• Supplementary Bonding Equipotential and supplementary bonding has been installed in accordance with BS 7671. 2.0.5 GENERAL LIGHTING

• Luminaires Luminaires are mounted recessed and be securely fixed in accordance with the manufacturer’s recommendations. All luminaires are suspended from the structural fabric of the building. Final connection to luminaires are via plug in connectors to facilitate disconnection from the fixed wiring system. All luminaires are fitted with high frequency control gear. All lighting levels have been designed in accordance with CIBSE guidelines and recommendations. All lens controllers are UV stable and TPa rated. • Switching and control general principles A fully addressable, automated and digitally controlled lighting control system is provided, comprising of the following:- � Area controller, located at each level in riser #3 for the tenant areas, and in riser #7 & #3

for landlord’s areas. � A spine network cable linking all LCM’s to the relevant area controller. � Fixed hard wired lighting control modules (LCM’s) to be in the ceiling voids at strategic

accessible locations. � Intelligent local control devices, sensors, switch plates. � Local field networking at each level between each area controller, LCM’s, sensors and

switches. It is possible to configure lighting with the following functions:- � Manual control and override via switch plates. � Presence/absence detection with time programmable group control in all areas. � Time control. � Cascaded presence linking (e.g. corridor hold).


� Alarm override – landlords area lighting to be interfaced with intruder alarm system to enable ALL luminaires to be automatically switched on when the intruder alarm is triggered.

� Daylight linking 2.0.6 EMERGENCY LIGHTING The installation comprise of the integral conversion of the general luminaries to provide emergency illumination for not less than 3 hours in the event of mains failure or local circuit failure. The emergency lighting is designed and installed in compliance with BS5266-1:2005. Emergency exit signage is designed and installed in compliance with BS5266-8:2004. All emergency lighting are configured for non-maintained operation, except in public areas. All exit signs and external bulkheads are self contained emergency luminaries to provided emergency illumination for not less than 3 hours. All emergency luminaries are connected to the un-switched ‘live’ and neutral of the local lighting circuit via key test switches. The key switches are located adjacent to the supplying distribution board. Each test key switch has a red neon indicator which illuminate when in test mode. Each key switch is engraved with the legend ‘Emergency Lighting Test’. 2.0.7 SMALL POWER • Office/tenant areas Power to the open plan office areas is taken from designated split metered distribution boards at each floor level. Power to desks is distributed via a network of underfloor busbar trunking laid out in a grid beneath the raised floor. The supply to the busbars is via a 3 core XLPE/SWA/LSF cable run on cable tray within the floor void. The busbar are approved to ASTA standard 138 and fully comply with BS EN 60 439-1:1994 and BS EN 60 439-2:1993. The underfloor busbar system is manufactured by Electrak Ltd and be rated 63A with a socket pitch pf 1 tap –off outlet per 200mm. Floor box outlets are provided to meeting room and at breakout areas. The general purpose power comprises of flush mounted 13A switched socket outlets, fed by means of a combined MCB/RCD unit, located on walls for cleaning and other requirements.


• Landlords/core areas The general purpose power comprises of flush mounted switched socket outlets, together with 13 amp fused connection units and isolators for various items of fixed equipment. Where surface mounted, accessories are of the heavy gauge steel type. The small power is supplied from the mcb distribution boards located within the service risers. RCD protection is provided to socket outlets in public areas and for cleaners use. Hand dryers are provided in WC’s supplied via a 13A switch fused connection unit mounted at high level with an outlet box at 1200mm AFFL for the hand drier to be mounted over. 2.0.8 FIRE DETECTION & ALARMS

• Fire detection and alarm system A new analogue addressable category L2 fire alarm system is provided in accordance with BS5839-1:2002, and BS 9999:2008. The main fire control and indicator panel is sited in the main entrance lobby on the ground floor where the fire service will gain entry into the building. The system includes a rechargeable standby battery capable of maintaining the system in operation for at least 72 hours, after which sufficient capacity will remain to provide operation of all alarm sounders for at least 30 minutes after the agreed power off period. A framed topographical mimic diagram is provided adjacent to the main panel. The mimic diagram is a colour scale representation of the building and of durable material mounted in a non-reflecting glazed frame. The Fire Alarm control panel includes the following main features:-

− Recessed enclosure having overlapping metal front plate.

− Hinged gasketted lockable front cover forming an integral part of the above enclosure. − 40 character LED or back lit LCD display.

− Control switches / push buttons are provided behind the panel cover for (a) silencing alarms (b) resetting the system (c) lamp tests.

− Network functionality − 4 No volt free contacts (For future usage)

− Other component parts of the fire alarm system will include, break glass units, electronic sounders, smoke and heat detectors.

Every individual manual call point and automatic detector is individually and uniquely identified at the control panel and the removal of a manual call point or automatic detector will cause a fault signal to be generated at the control equipment.


So as to minimise disruption during maintenance and testing the system incorporates provisions whereby individual detectors and call points can be tested without sounding an alarm, activating interfaces or requiring the complete system or more than one zone to be disabled to prevent an alarm. The wiring of the complete fire alarm and detection system is fully monitored so that failure whether to open or short circuit will result in a fault warning at the control equipment not an alarm of fire. In accordance with BS 5839 such a failure should however not prevent an alarm being sounded for any genuine detection of a fire or alarm actuation. Zone isolators are provided where required as part of the alarm system wiring installation. Xenon/beacons are provided within the disabled WC, male WC & female WC. Fire alarm interfaces are provided to various pieces of equipment such as mechanical plant, door access control units, lifts and the damper control panel. Mains voltage supply and local isolation for the Fire Alarm system is labelled as prescribed within BS 5839, in order to avoid inadvertent isolation. The complete fire alarm and detection system is zoned to suit the constraints and recommendations, set out in BS 5859 Part 1 2002 and all other relevant codes and standards and the requirements of the local building control/fire officer. Zones are arranged so that indications of the fire alarm system can be rapidly related to fire layout of the premise without confusion and without risk of misleading indications. Full text descriptions is provided for each device at the panel if the device is activated, or is faulty. The zoning of the system provides a clear indication and search area for the fire service. All wiring within the fire alarm installation is FP Plus ‘enhanced’ cable. The fire alarm system is network connected to the existing site wide fire alarm system.

• Disabled refuge alarm system A disabled refuge alarm system is provided in compliance with BS5588 and BS5839 Part 9. The system is battery backed for 24 hours in quiescent mode with min. 3hr on full output. The system is fully monitored for both audio and data connections. The master control panel is located adjacent to the main fire alarm panel. Remote refuge call units are red in colour and flush mounted. Each unit has an ‘occupied’ button, which when activated alerts the master control panel, and a communication unit that will be able to alert the master control panel by simply talking into the unit. Refuge call units are provided at all wheelchair refuge locations.


2.0.9 ELECTRICAL INSTALLATION ASSOCIATED WITH MECHANICAL SERVICES Power supplies are provided to individual items of mechanical equipment as listed below:-

� Basement plant room mech control panel � Roof top plant room mech control panel � Chiller units on roof top � AHU’s on roof top � IT & Comms room condensers & associated indoor units � Chiller sequence panel in roof top plant room � WC extract fan on roof top with control wiring out to PIR’s located in each WC � Fan coil units & condensate pumps � Smoke dampers � Domestic services shut-off valves � Wall mounted extract fans in roof top plant room � Containment for all mechanical control devices � over door heater at main entrance, including remote controller unit � energy meter monitoring cable containment

2.0.10 TELECOMMS / DATA INSTALLATION The contractor has:-

- Supplied, installed, terminated & tested all Cat 6 UTP cabling from the designated comms room cabinet on each level, to each floor box / workstation.

- RJ45 outlets. - Patch panels needed to terminate cables at each cabinet.

The contractor has familiarised themselves with the Stockport Civic IT departments specification and ensured all requirements are adhered to. 2.0.11 SECURITY INSTALLATION

• Intruder alarm system An intruder alarm system has provided in compliance with the requirements of PD 6662:2004 and DD243:2002. The intruder alarm complies with the ACPO policy on police response to security systems and be supplied, installed and was commissioned by an NSI approved specialist security company. In general, the system comprises of dual technology movement detectors, magnetic contacts to doors, and a personal attack actuator at the ground floor reception desk. Generally the main circulation routes and ground floor rooms with external glazing are provided with coverage by dual technology PIR/microwave motion detection devices. Magnetic door contacts are installed on all final exit doors and be individually addressed to enable individual programming for flexible operation and for door monitoring purposes.


An external visual/audible and internal audible alarm units is provided to provide notification that the intruder alarm has been activated.

• Door access control system A door access control system is provided. The door access control system is a PAC Secure Net system supplied, installed and commissioned by an NSI approved specialist security company. The access control system comprises of a fully functional addressable network. The system is connected and monitored from the reception via a dedicated software package and computer display terminal. The access control system utilises proximity reader type devices. Access is gained by use of proximity laminated ISO access cards. Exit from the controlled area is via a push to exit button with green emergency release break glass units provided to override the door locking arrangement in the event of a fault. • CCTV system The CCTV system is supplied and installed to all public areas and the building perimeter. Power supplies are provided to each camera. Monitors and control is provided in a ground floor office. • Disabled WC alarm call system A disabled alarm/assisted call system is provided within all disabled toilets. Each system comprises of the following:- � red pull cord activation with reassurance light � local reset button � local visual and audible alarm unit Each system reports back to a central indicating mimic panels located at the ground floor. 2.0.12 ELECTRICAL INSTALLATION ASSOCIATED WITH LIFTS Power supplies are provided to each lift motor location. All other power and control wiring associated with the lift installation has been provided as part of a separate package by the specialist lift contractor. 2.0.13 UNINTERRUPTIBLE POWER SUPPLIES A 100kVA three phase input and output UPS is installed to provide an uninterrupted supply to the IT systems via switchboard ref: USB1, the UPS system is located in the roof top plant room.


The UPS is an on-line type and fitted with an internal bypass and is a double conversion system comprising rectifier / charger and inverter power blocks. UPS is IP20 rated with fan assisted ventilation. The UPS has an autonomy of 15 minutes on full load. The batteries are 12volt, 10 year lead-acid, sealed (VRLA) type, and located in battery cabinets adjacent the UPS unit. The UPS has the facility to signal its status information via volt free contacts to the BMS. 2.0.14 LIGHTNING PROTECTION SYSTEM

• Design A Lighting Protection System has been installed in accordance with the requirements of BS EN 62305.

• Particular requirements The lightning protection system utilises the building structure and components to form the down conductors, and ground earth termination networks. • General The lightning protection system consists of an air termination network (pvc coated aluminium tape), down conductors (building steel frame), bonded via testing points to earth terminations and earth electrodes.

• Transient surge protection Transient surge protection is provided to comply with the following:-

• Protectors are tested in accordance with the requirements of BS6651:1999, BS 2914:1972 & IEEE C62.41:1991.

• The protectors do not interfere with or restrict the systems normal operation.

• The protector is rated for a peak discharge current of no less than 10kA (8/20ms waveform).

Lightning protection surge arrestors are provided to all main switch panels and to all services leading to and from the unit and in accordance with the above code and wiring regulations. This includes all main LV switchboard, distribution boards designated for external supplies and all communications services.


2.0.15 EXTERNAL LIGHTING An external lighting system is installed by means of building and column mounted luminaires. The external lighting complies with the requirements of ILE guidance note for reduction of obtrusive light (2005), limiting the night time pollution. The external lighting also complies with the local planning authorities requirements. The external lighting is wired in underground ducts terminating into a 300x300mm cable chamber located directly adjacent each lighting column. External lights are wired in XLPE/SWA/LSF cabling from the dedicated external lighting distribution board and are controlled via a contactor arrangement with photocell, time and manual override facility. The contactor arrangement and control selector switch and timeclock are located adjacent the external lighting dist board.


Appendix 1

Residual Risk Assessments

cn,gy,vh,M&E Building Services Design Philosophy...CN/GY/VH/NW6393/H3 (19 October 2010) – Ponsonby...

Documents

Transcript of cn,gy,vh,M&E Building Services Design Philosophy...CN/GY/VH/NW6393/H3 (19 October 2010) – Ponsonby...