Section 6 Electrical Services

Section 6

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Section 6 - Electrical Services Design Standards Brief

Property Services Construction Section 6 Page 2 Issue No. 5, January 2003 Copyright RMIT University, Melbourne, Australia 1997 ALL RIGHTS RESERVED

6 CONTENTS 6.1 INTRODUCTION................................................................................................................................. 3 6.2 MAIN ELECTRICAL SWITCHBOARD................................................................................................... 3

6.2.1 Switchboard Design ............................................................................................................. 3 6.2.2 Switchboard Labelling ......................................................................................................... 4 6.2.3 Meters and Instruments........................................................................................................ 5 6.2.4 Fuses with Enclosed Fuse Links ............................................................................................ 5 6.2.5 Schematic Wiring Diagram ................................................................................................. 5

6.3 DISTRIBUTION SWITCHBOARDS, CONTROL PANELS AND CABLES .................................................. 6 6.3.1 Distribution Switchboards .................................................................................................... 6 6.3.2 Control Panels ....................................................................................................................... 6 6.3.3 Cables .................................................................................................................................... 7

6.3.3.1 PVC Cable ...............................................................................................................................................7 6.3.3.2 Metal Cable Duct...................................................................................................................................7 6.3.3.3 Cable Tray and Cable Ladder .............................................................................................................7 6.3.3.4 Skirting Wall Duct.....................................................................................................................................7 6.3.3.5 Chasing-in of Cables..............................................................................................................................7

6.4 LIGHT FITTINGS/LUMINAIRES ............................................................................................................ 7 6.4.1 Fluorescent Luminaires......................................................................................................... 7

6.4.1.1 Ballasts ......................................................................................................................................................7 6.4.1.2 1200 mm Lamps ......................................................................................................................................7 6.4.1.3 Capacitors ...............................................................................................................................................8 6.4.1.4 Starter Switches .......................................................................................................................................8 6.4.1.5 Lamp Holders...........................................................................................................................................8 6.4.1.6 Fuse Protection........................................................................................................................................8 6.4.1.7 Fixings ........................................................................................................................................................8 6.4.1.8 General ....................................................................................................................................................8

6.4.2 Incandescent Light Fittings/Luminaires ............................................................................. 9 6.4.3 Extra Low Voltage (ELV) Light Fittings ................................................................................ 9 6.4.4 Down Lights.......................................................................................................................... 10 6.4.5 Wiring .................................................................................................................................... 10 6.4.6 External Light Fittings/Luminaires ...................................................................................... 10 6.4.7 Internal Light Fittings/Luminaires....................................................................................... 11 6.4.8 Bollard Luminaires, Post Top Luminaires and Inground Lighting.................................. 11

6.5 OTHER ELECTRICAL INSTALLATIONS............................................................................................... 11 6.5.1 Switched socket Outlets .................................................................................................... 11 6.5.2 Light Switches ...................................................................................................................... 12 6.5.3 Automatic Sliding Doors .................................................................................................... 12 6.5.4 Fire Alarm Systems (See section 2.16).............................................................................. 12 6.5.5 Emergency and Exit Lighting ............................................................................................ 12 6.5.6 Communications Rooms ................................................................................................... 13 6.5.7 Electric Motors..................................................................................................................... 13 6.5.8 Labelling............................................................................................................................... 13

APPENDIX 6.A: ELECTRICAL SERVICES STANDARD SPECIFICATION............................................................14 APPENDIX 6.B: OPERATING AND MAINTENANCE MANUALS SCHEDULE OF CONTENTS .........................42

Design Standards Brief Section 6 - Electrical Services


6.1 INTRODUCTION The installation of electrical services and equipment in buildings shall comply with the standards as set out in Section 1 of this Brief and Electrical Services Standard Specification Appendix 6.A.

The electrical supply distribution system for the campus is 3 phase, 4 wire 415/240 volts, 50 Hz. The supply originates from Supply Authority sub-stations distributed around the Campus.

Early in the Design Stage, the Consultant shall calculate the Maximum Demand (MD) and energy consumption for each project or installation, and discuss the selection of the appropriate tariff and load management techniques with the Manager, Engineering and Maintenance.

The Consultant shall submit to the Services Project Manager a detailed report for each project, including the MD calculations and recommended tariff selection.

Electrical Services to be designed in consultation with the Services Project Manager.

6.2 MAIN ELECTRICAL SWITCHBOARD The main electrical switchboard shall be specified as a custom built switchboard and shall be designed in accordance with the relevant sections of A.S. 3439 & AS 3947.

Tenderers shall submit full details of the switchboard with their tender, together with the name of the testing authority and relevant information regarding the fault current rating of the switchboard.

Full shop drawings, together with all relevant data relating to a proposed main switchboard, shall be delivered to the Services Consultants and the Manager, Engineering and Maintenance prior to manufacturing the switchboard.

Switchboards are to have the capacity to withstand prospective fault for a given substation.

6.2.1 Switchboard Design Switchboard design shall incorporate the following:

the Consultant shall confirm with the Services Project Manager the requirement for spare capacity for future C.F.S. and/or ACB units (recommended 40%).

copper busbars shall be designed to limit temperature rise to a maximum of 40oC when carrying the maximum current rating of each and all associated items of switchgear;

busbars for the red, white and blue phases shall be colour coated. Colouring shall be by means of full length heat shrink (Thermoshrink or similar). Strips, or bands of heat shrink shall be utilised to identify the neutral and earth conductors;

the main switchboard shall be of a front connected design up to 800 amp rating; all "live" sections of a main switchboard, within wiring chambers etc., shall be fully

insulated to prevent contact with live parts;

the main switchboard shall be free-standing, dust and vermin proof; control of outgoing supplies shall be as follows-

~ Up to 800 amps C.F.S. unit ~ 800 amps and over A.C.B. unit

Where Moulded Case Circuit Breakers (MCCB) are requested the confirmation of the Services Project Manager should be sought.



the minimum capacity for any CFS unit shall be 200 amps; CFS units shall be manufactured by Nilsen or other University-approved manufacturers.

Each CFS assembly shall be withdrawable from the body from the front of the switchboard;

ACB units shall be manufactured by Nilsen (D-PRO series) or other University-approved manufacturers;

the provision of a positive air ventilation system for the main switchboard room to minimise dust entry shall be considered;

lift-off hinges shall be supplied for all hinged doors; doors shall be supplied with lockable latches; lock cylinders shall be keyed to CL-001 keys; removable panels shall be supplied with-

~ Suitable lifting handles ~ Captive knurl-headed fixing screws

removable panels shall be supported by locating dowels or pins to provide support for the panel when the fixing bolts are removed;

the design shall incorporate adequate space for: ~ Supply Authority metering equipment ~ University BAS connections ~ Termination of incoming and outgoing circuits ~ University KWH check metering and for all outgoing submains ~ Future extensions or additions

A separate, wall-mounted, steel, lockable cabinet, keyed to a CL001 key shall be provided in a suitable location in the main switchboard room.

~ The cabinet shall be labelled SPARE FUSES AND EQUIPMENT ~ the cabinet shall contain spare parts, tools, and a full set of spare HRC fuse cartridges

for all CFS units installed on the main switchboard

The Contractor shall install a copy of the schematic wiring drawing, in a suitable enclosure inside the main switchboard room; (Refer to clause 6.2.5)

6.2.2 Switchboard Labelling All switchgear, apparatus, terminal strips, and controls shall be labelled in accordance with the Supply Authority's requirements and to the satisfaction of the Manager, Engineering and Maintenance. The following guidelines shall be observed:

Lift-off panels shall be labelled to identify their location on the main switchboard; Labels shall be provided for Essential Supplies, which are deemed to include the following:

~ fire protection equipment. ~ fire indicating panel. ~ passenger elevators. ~ circuits supplying computer LAN, WAN or computer equipment. ~ circuits controlling emergency luminaires. ~ circuits controlling security or building access control equipment.

all incoming and outgoing circuits shall be adequately labelled, including all essential supply circuits.



Traffolyte labels shall be installed on the front door of a C.F.S. unit and shall indicate the capacity of the unit and the rating of installed fuse cartridges. Labels shall also be installed adjacent to the load terminals.

6.2.3 Meters and Instruments The installation of switchboard instrumentation is a complex issue. Design discussions with relevant University representatives shall take place at an early stage. Consideration shall be given to the following:

CALMU smartmeters (check meters) or equal; Maximum Demand ammeters; a voltmeter; kWh check meters (with volt free, impulse contacts for connection to the BAS system) the type of current transformers; test links for current transformer secondary terminals; fused potential terminals for connection of portable recording equipment; indicating lights. See also Appendix 6.A Section 6.A.3 for guidelines for the installation of Circuited power

analysis meters.

6.2.4 Fuses with Enclosed Fuse Links Fuses shall comply with A.S. 2005 (Parts 1 and 2). All fuse cartridges shall be of the HRC type. Fuses shall be suitable for the fault current of the installation and shall discriminate properly with other protective equipment.

The installation of motor start fuse cartridges shall be avoided.

All fuse cartridges (excluding those installed in CFS units) shall be held in a fully enclosed fuse base with shrouded fuse contacts. Glow lamps for each HRC fuse assembly shall be specified.

6.2.5 Schematic Wiring Diagram A schematic wiring diagram of the complete switchboard shall be supplied. The wiring diagram shall include, but shall not be limited to, the following information:

circuit breaker capacities and trip settings fuse sizes capacity of CFS units installed size and capacity of installed busbar capacity of incoming supply capacity of outgoing circuits destination of submain supplies size of main earth conductor and location of main earth electrode type test rating of the Main Switchboard



The Contractor shall install a copy of the above drawing in a suitable enclosure inside the main switchboard room.

The Contractor shall supply AutoCAD copies of the diagram as per Section 1.

6.3 DISTRIBUTION SWITCHBOARDS, CONTROL PANELS AND CABLES

6.3.1 Distribution Switchboards Spare capacity of 50% shall be provided for all distribution boards (i.e. 50% full). Standard distribution boards shall be manufactured University-approved suppliers.

Circuit breakers controlling final sub-circuits shall be Cutler-Hammer or other University-approved equivalent. Installation of LOCK DOGS for all circuit breakers controlling computer outlets or special equipment shall be specified.

The installation of DUPLEX circuit breakers shall not be permitted.

Cutler-Hammer, NPH Terasaki or similar circuit breakers shall be specified for all phase power circuits.

Installation of a centre mounted main switch, to control each distribution board, shall be specified. All busbar tee-offs shall be fully insulated.

6.3.2 Control Panels Sprecher and Schuh contactors, panel mounted control switches or equal approved shall be specified. Contactors, relays, control switch etc. shall be DIN-Rail mounted. 100% spare capacity shall be provided on the panel for future expansion (i.e. 50% full).

all cables shall be identified by numbered ferrules at each termination including field terminations.

equipment within the panel shall be logically laid out and labelled there shall be sufficient space between items to permit safe maintenance a minimum of

50 mm between contactors

automatic controls shall be mounted external to the switchboard in a separate cabinet containing only extra-low voltage wiring; control wiring entering the switchboard shall be insulated to the appropriate rating;

there shall be adequate cabinet ventilation to ensure against temperature rise and thermal overload operation.

Circuit breakers are preferred in lieu of HRC fuses. Where HRC fuses are specified, they shall be complete with glow lamps.

Time-switch clocks are the standard for the University.

Schematic diagrams, complete with wire numbers, shall be installed at each control panel.



6.3.3 Cables All cables shall be stranded copper conductors, PVC insulated 0.6 kV, V75 grade conforming to A.S. 3147.

General power circuits shall be wired in not less than 2.5 mm2 (7/.067) TPS cable (black colour).

General light circuits shall be wired in not less than 2.5 mm2 (7/.067) TPS cable (white colour).

Control cabling shall conform to the specification in Section 7 of this Project Standard.

6.3.3.1 PVC Cable Cables shall be concealed wherever possible. Cables installed as surface wiring shall be enclosed in PVC mini ducting in lieu of PVC conduit subject to approval. The duct shall be fixed to the wall with suitable fixings, not double sided adhesive tape.

6.3.3.2 Metal Cable Duct Where permitted to specify, metal duct shall be selected from the Dencol range or equal.

6.3.3.3 Cable Tray and Cable Ladder Cable tray and cable ladder shall be specified from the Burndy or Dencol range or equal.

6.3.3.4 Skirting Wall Duct Skirting/wall duct shall be specified from the MODULINE range or other University approved suppliers.

All material ladders and ducts shall be earthed including joints for electrical continuity.

6.3.3.5 Chasing-in of Cables Any cables chased into masonry shall be installed in suitable PVC conduit.

6.4 LIGHT FITTINGS/LUMINAIRES

6.4.1 Fluorescent Luminaires Refer to Section 4.7.3 regarding the use of T5 fluorescent lamps. As a minimum the Consultant shall specify luminaires which incorporate 1200 mm long, 26 diameter fluorescent lamps. All light fittings shall be HPF. Min 0.9 P.F.

The following items shall be taken into account when specifying fluorescent luminaires. (See also Section 4).

6.4.1.1 Ballasts Separate ballast shall be specified for each fluorescent lamp. Ballasts shall be complete with quick-connect terminals. They shall be of the full low-loss Atco LLEC range or similar.

6.4.1.2 1200 mm Lamps The colour temperature of the lamps shall be 3000 degrees kelvin. The minimum lumen output for a 36W fluorescent lamp at 100 hours shall be minimum 2700 lumens. Lamps shall be selected from the Thorn, Sylvania, Osram, or Philips range.



6.4.1.3 Capacitors Capacitors shall maintain the Power Factor at or better than 0.9 lagging and have a minimum clearance of 75 mm and 100 mm from any ballast.

6.4.1.4 Starter Switches Starter switches shall be Wotan ST171 or similar for 36 watt lamps and shall be capable of a minimum of 5000 operations. They shall be complete with a manual reset.

6.4.1.5 Lamp Holders Tombstone lamp holders, HPM 380 or similar, shall be specified. Lamp holders shall be made from non-flammable materials and shall not be starter/lamp holder combined type.

Lamp holders with snap-in wiring terminals shall only be accepted if solid conductor (1/0.80) wiring is utilised.

6.4.1.6 Fuse Protection Each light fitting shall be provided with a fuse of a suitable rating to isolate the fitting in the event of a fault within the light fitting.

Such fuses shall be readily accessible.

6.4.1.7 Fixings Cadmium plated loxins, dynabolts or approved metal expansion devices shall be used for securing light fittings to concrete ceilings. Wooden or plastic plugs will not be accepted. The MINIMUM number of fixings per light fitting shall be as follows: 1 x 36 watt fluorescent light fitting 2 fixings

2 x 36 watt fluorescent light fitting 4 fixings. 6.4.1.8 General Diffusers, reflectors etc., shall be installed just prior to Practical Completion so as to limit dust build up.

Reflectors shall be manufactured from high quality steel or aluminium.

Luminaires shall be selected for ease of lamp changing and cleaning and have adequate mechanical and electrical features to ensure durability and lack of deterioration.

Diffusers shall be strong and of rigid construction.

Luminaires selected for computer laboratories or VDU applications shall be of the low brightness type.

Switching shall be arranged to provide for 50% illuminance

Where entire floor levels are being documented, the installation of 24 hour light fittings at strategic locations for general security lighting shall be discussed.

Excess illumination shall be discouraged.

Where possible, all luminaires shall be installed using the plug-in method.

Installations shall conform to A.S. 3145 for minimum radio interference.

Prismatic diffusers for office, public or common areas shall be K19 (only where there is no screen based task application); and for special purpose rooms K19 with silver tint.



Fittings which incorporate single end PL or PLC fluorescent lamps shall not be specified without approval from the Services Project Manager.

Each luminaire shall be supplied with a fixed terminal block. The terminal block shall accommodate a minimum 4 mm2 cable. Each terminal block shall incorporate a spare 'loop' terminal.

Incandescent Light Fittings/Luminaires

Installation of incandescent luminaires shall be avoided. This clause may not apply to lecture theatres; in all cases the Consultant shall discuss this issue with the Manager, Engineering and Maintenance Branch. Incandescent light fittings shall only be considered where there are no other possible solutions.

Where permitted, incandescent light fittings shall be supplied with long-life 250 volt lamps and the lamp holders shall be porcelain.

6.4.2 Extra Low Voltage (ELV) Light Fittings A separate step down transformer shall be required for each ELV lamp. The transformer for each ELV light fitting shall be readily accessible. Traffolyte labels shall be installed (light fitting and associated transformer) where the transformer is installed remote from the light fitting and not more than 2 metres from the lamp.

ELV Luminaires shall be selected on the following criteria:

adequate ventilation; ease of lamp replacement; ease of cleaning. Where the luminaires are recessed, the fitting shall incorporate a design to prevent contact with materials such as ceiling insulation, with the ELV lamp, or hot luminaire components.

ELV dichroic halogen lamps shall be GE, or approved equivalent, with an average rated lamp life of 3,000 hours as a minimum.

Where dimming of ELV lamps is required, the dimmer unit shall incorporate the following:

Soft start; digital control; halogen clean-up cycle; in-built surge protector; internal time clock; RF suppression; ELV dimmer units shall be selected from the DYNALITE range or similar University-approved.

Lamp holders shall be the bi pin, high temperature, ceramic base variety. The wattage of the lamp shall be identified at the lamp holder. In particular applications ELV lamps shall be supplied with a suitable UV filter glass.



6.4.3 Down Lights Luminaires shall be selected from the range which incorporate compact fluorescent or HID lamps. Down lights with incandescent lamps will not be accepted.

A separate ballast shall be provided for each lamp and a suitable label shall be located adjacent to each lamp holder as a means of identification of the required lamp wattage.

Ballasts should be the switched-start type with losses after fifteen minutes of no greater than:

7 watt lamp 3.5 watts 9 watt lamp 3.5 watts 18 watt lamp 5.5 watts. Reflectors should be of high quality, chromed aluminium.

6.4.4 Wiring The installation shall be designed so that future additional luminaires can be easily added to the circuit. The current load of the initial circuit when installed should not be more than 50% of capacity. Unswitched active conductors shall terminate in each luminaires. This will allow for simple future alterations, should they occur. Ceiling pull cord switches are not acceptable.

6.4.5 External Light Fittings/Luminaires External luminaires shall be specified from the HID range and shall conform to the following:

self-ballasted lamps will not be accepted; HID ballasts shall be of energy efficient design; capacitors for each light fitting shall maintain the Power Factor at, or better than, 0.90

lagging.

Luminaires which incorporate the following types of lamps will not be accepted:

QI lamps; incandescent lamps; dichroic (halogen) ELV lamps. External luminaires shall be individually protected by HRC fuses and have adequate ventilation. Reflectors should be manufactured from high quality (purity) aluminium.

Luminaires shall be selected for ease of lamp changing and cleaning and have adequate mechanical and electrical features to ensure durability and lack of deterioration. They shall be treated to prevent corrosion.

External security and street lighting shall be colour corrected mercury vapour. External building security lighting shall be an approved type, painted to match the building structure. Street lighting shall comply with the principles detailed in the Technical Notes, Urban Spaces City and Bundoora Campus, June 1996. All external security and street lighting shall be controlled by photo cell switching. By-pass switches shall be provided on all circuits. Each street light poles shall be separately fused. Where appropriate photo-electric cell switching is to be considered.



6.4.6 Internal Light Fittings/Luminaires Internal security lighting shall be provided in the following areas of the Buildings.

Balconies, verandas, corridors and all stairways and exterior doors. The lighting shall be controlled by an externally mounted photo electric cell and a bypass switch, located in the distribution switchboard cupboard.

Light Switching Two way switching and time clock control shall be provided on all stairways and corridors subject to approval.

Light switches in tunnels shall be fitted with continuously operating amber coloured neon indicators.

Light switches in tunnels and all service areas shall be the protected type.

Sufficient controls, both automatic and manual, shall be provided so that energy can be saved when spaces are not in use or when systems require modification.

Energy management timing systems shall be considered for lecture rooms, seminar rooms, laboratories and any other areas have high usage. Consideration shall be given to the use of occupancy sensors.

Rooms containing one or more luminaires shall be provided with multiple switching.

Emergency light fittings or fittings incorporating an additional lamp for emergency lighting shall also comply with A.S. 2293 complete with "NATA" Test Certificate.

Metalware shall be not less than 0.8 mm thickness with adequate folds and return edges etc. to provide stiffness and rigidity. All corners and joints exposed to view shall be welded, ground smooth and filed where necessary before painting. All metal work shall be treated with a rust inhibitor or alternatively manufactured out of zincanneal.

All recessed luminaires diffusers shall be prismatic hinged frame supported.

All luminaire shall be power factor corrected to not less than 0.9 lagging.

Luminaire in computer areas shall be provided with low brightness glare control diffusers to prevent discomfort to computer operators.

A fluorescent luminaires and power point shall be provided in every telephone and computer frame cupboard.

6.4.7 Bollard Luminaires, Post Top Luminaires and Inground Lighting Consultants should contact the Project Manager and Campus Planning for advice of specialist lighting. Installation should reflect the current installations.

6.5 OTHER ELECTRICAL INSTALLATIONS

6.5.1 Switched socket Outlets Switched Socket Outlets (SSO) shall be selected from the Clipsal range single plate or other University-approved and shall be specified as white from the standard Clipsal colour range. Double outlet combinations shall be specified throughout an installation. Clipsal IP56 Series shall be specified for wet areas. The circuit current load shall be no more than 60% of capacity when initially installed.



All circuits for SSOs shall be protected by earth leakage circuit breakers or RCDs. Emergency stop buttons shall be installed for safety control for laboratory power outlets.

The location of RCD or ELCB shall be approved by the Manager, Engineering and Maintenance Branch.

6.5.2 Light Switches Light switches shall be selected from the Clipsal range single plate and shall be specified as white from the standard Clipsal colour range. Clipsal 30-FLM-15 amp mechanisms shall be specified for all standard light switches.

Refer Appendix 6A Clause 06.A.6.6 for further details.

6.5.3 Automatic Sliding Doors Power to automatic sliding doors at entrance(s) to a building shall be key switch operated.

Refer to clause 2.9.2 for keying details.

A further requirement will be that the sliding door must remain in an open position during normal hours when Fire Indicator Board is in alarm mode.

An approved electronic lock and mounting position is required where security access control systems are installed.

6.5.4 Fire Alarm Systems (See section 2.16)

6.5.5 Emergency and Exit Lighting The University has standardised on two types of emergency lighting systems:

Minitronics Single Point Premium range; Minitronics Single Point Computer Monitored range. The Consultant shall calculate the best installation option based on life cycle cost over a 12 to 15 year period.

Self contained emergency and exit lighting shall be provided throughout the buildings in accordance with A.S. 2293. The emergency and exit lighting shall be connected to a Computer monitoring facility as directed by the Services Project Manager.

All exit lighting shall be sustained circuit, two tube 10 watt fluorescent luminaires.

Emergency and exit lighting circuits shall be wired direct from distribution switchboards and shall be labelled with engraved plastic labels in accordance with A.S. 2293. Provide a key operated "auto-off-manual" switch adjacent the distribution switchboards for testing of emergency and exit lighting.

Emergency lighting shall be installed in every toilet, essential area and switch room. Luminaires shall be a non-sustained circuit minimum 36 watt, with lighting levels designed to provide adequate lighting to carry out operations under power failure conditions in switch rooms.



6.5.6 Communications Rooms All SSOs in Communications Rooms shall be surge protected.

6.5.7 Electric Motors The following are preferred:

Fractional H.P. "G.M.F."

Ball bearing 3 phase up to 12 kW "Crompton Parkinson", ASEA

Ball bearing 3 phase 12 kW to 40 kW - "ASEA"

6.5.8 Labelling Each item of equipment (i.e. switched socket outlets, light switches, computer outlet plates, etc.) shall be labelled by the following method:

IPA studs to indicate phase and circuit number; Supplementary information shall be provided at the rear of equipment.

Traffolyte labels shall be specified for all main and submain feeders.

Monitoring cables shall be labelled every 3 metres and/or at change in direction.



APPENDIX 6.A: ELECTRICAL SERVICES STANDARD SPECIFICATION

6.A.1 INTRODUCTION

6.A.1.1 General This standard specification sets out the minimum requirements for the design and construction of its electrical services within the University. Equipment supplied and workmanship shall be of best quality. The work shall comply with the requirements of all relevant Legislation, Standards including current wiring regulations and any other Authority having jurisdiction over the project. For all intents and practical purposes, RMIT City Campus is considered as a Supply Authority. Prior to the issue of the Certificate of Practical completion the contractor shall certify that the applicable statutory requirements, regulations and standards. A copy of all certificates shall be forwarded to RMIT. Requests for departure from this standard shall be confirmed in writing to the RMIT Services Project Manager, Property Services prior to documentation installation. False alarms caused by the installation shall be the responsibility of the Contractor. Refer to clause 12a.33 installation of existing services.

6.A.2 Underground Wiring

6.A.2.1 Underground System All underground cabling shall be installed in Category A system. Location of existing underground services shall be established before excavation. Trenching shall not commence until cable, conduits, etc., are on site. Refer to clause 12a.26 determining existing services prior to excavation. Where existing services are encountered during excavation, provisions shall be made not to damage such services. Trenches shall not be backfilled before cables are surveyed by the Services Project Manager, Construction and marked by the Contractor on "as built" drawings. All MV and LV conduits shall be installed at a minimum depth of 600 mm below the finished surface. Conduit(s) shall be embedded and totally covered in 50 mm clean washed sand. Conduits installed in same trench shall be spaced to a minimum of 50 mm. Marker tapes shall be provided 100 mm above the conduit. Spare conduit provided in each trench shall be a minimum of 50%. End caps shall be provided on spare conduits with draw wire. Packings shall be provided at conduit ends where cables are installed. Cutting pavement, backfill and making good of roadways, paths and gardens shall be included in this work. Excess spoil after allowance for subsidence shall be removed by the Contractor. Compaction of backfill shall be provided.



Appendix 6.A (Cont) Cable markers shall be provided where the cable changes direction and where cable enters or leaves a building. Markers shall be of a flush type warning plate with direction indicators. Where conduits change more than two (2) different directions, cable pits shall be provided. Pits shall be of the reinforced concrete waterproof type with drainage. Gatic type covers shall be provided. Conduits entering these pits shall protrude not less than 50 mm into the concrete pit wall for the installation of cables and/or end caps. Conduit ends shall be free of sharp edges. All conduit ends with cables shall be sealed for waterproof purposes as directed. All trenches shall be installed with two (2) 63 mm diameter spare conduits for future Communication cables. Underground conduits shall be electrical orange for 415/240v cables. Other data conduits shall be white.

6.A.2.2 Underground Cable Underground multi core and single core cables shall be double insulated copper conductors. New cables shall be installed without joints. Subject to the approval, joints to the existing underground services may be allowed. Refer to clause 04.00 for further requirements of mains and submains.

6.A.2.3 Anti-Termite Treatment The ground surrounding cables, pipe enclosures and cable pits shall be treated to provide protection against termite attack. The anti-termite treatment shall be carried out to approval by a firm specialising in the work. Notices shall be provided.

6.A.3 METERING

6.A.3.1 Supply Authority Metering Supply and install all fixings, panels, wiring links and hardware to the requirements of the Supply Authority for the most economical tariff. Provide all co-ordination and make all necessary applications for the provision of metering equipment. Pay all associated charges for the provision of metering equipment as may be rendered by the Supply Authority.

6.A.3.2 In-House Metering Supply and install all necessary fixings, wiring and hardware for the polyphase kilowatt hours metering to each of the main building services emanating from the main switchboard. Metering shall be for the following services: Incoming mains. Lifts. Mechanical switchboards. All submains.



Appendix 6.A (Cont) Other specialised power e.g. computer services as directed. Metering, for each floor, shall

be provided to monitor lighting and power consumption. Meters, of approved type, shall measure voltages, amperes, kilowatts, kilowatt-hours, power factors and frequency. Such outputs shall also be monitored via the BAS system.

Time/consumption graphic charts shall be provided and storage of data via PC software. Refer to clause 08.00 for other information. Meter shall be Circutor Modbus compatible meters or equivalent.

6.A.4 SWITCHBOARDS

6.A.4.1 General The quality of the materials used and the standard of workmanship shall comply with the latest issue of the Australian Standards and to the satisfaction of the authorities. The quality of manufacture shall include main switchboards, distribution switchboards and control assemblies.

6.A.4.2 Main Switchboards All main switchboards with ratings of 800 A and above, on the incoming supply conductors shall be constructed to Form 3, free standing metal clad cubicle back connected type to AS3439. The degree of protection shall be by mechanical means. Smaller switchboards can be wall mounted type or free-standing metal clad to Form 2 construction and dead front, to approval by the Manager, Engineering and Maintenance Branch. The proposed switchboard manufacturer shall be submitted for approval prior to acceptance of tender or quotation. Type tested certificate shall be provided. Switchboards shall be complete in every respect, fully wired and factory tested. Design to facilitate easy access to and removal of component parts. Switchboards shall be provided with suitable means of securing the complete assembly to floor or wall. Free standing type shall be provided with plinth or suitable channel support of not less than 75 mm high with provision for future extension and cabling. Trenches shall be accessible. The degree of protection shall be minimum IP33. All holes shall be provided with suitable bushing. Coverplates shall be of the removable type. All equipment shall be flush front type. Louvred vents with mesh wire shall be provided for switchboards with horizontal length greater than one metre. Switchboards shall be designed to prevent the ingress of dust and insects. Lifting eyebolts shall be provided to switchboards weighing more than 300kg. Switchboards shall be coloured internal gloss white and external grey. Busbars within the switchboard and distribution switchboards shall be manufactured from high conductivity hand drawn copper bar with smooth edges. Rating of busbars shall include the total capacity (rating) of the functional units to A.S. 1136 including spares, plus 40% spare capacity for future extension. All joints, terminations and fixings shall be fully accessible. Adequate support shall be provided so that they can withstand the stresses caused by the prospective maximum fault current as specified for a period of one (1) second and in no case shall have a fault capacity of less than 18 kA. Busbars shall be electro-tinned, coated with acid free petroleum jelly and bolted together with cadmium plated steel bolts, washers, nuts and locknuts. Neutral busbars shall have the same current rating and size as the active phases. Provision shall be given for future extension of the main busbars system.



Appendix 6.A (Cont) An earthing copper bar shall be provided where MEN system is installed. Labels shall be provided at the external and internal switchboard. Phase coloured as follows: A phase Red. B phase White. C phase Blue. Neutral Black. Earth Green. Wrapping with tape will not be accepted. Marking of busbars of manufacturing purposes shall be by means of crayon or similar marker. Busbars shall be designed for a maximum temperature rise of 40C above an ambient of 40C. Cabinets shall be clean and free from rust, corrosion, grease and scale, rough surfaces filled and rubbed smooth. Cable zone for outgoing cables shall be installed with appropriate cable tray for cable anchorage. All terminations shall be of adequate size to accommodate the cable lugs. Busbar stub connections shall be provided on terminals for cables rated at 100 A and above, and shall be suitable for the connection of bolted cable lugs. All bolts, screws and nuts shall have hexagonal shaped heads, non-ferrous metal and be fitted with washers. Self tapping screws will not be accepted. Small wiring or control wiring shall include wiring within main switchboard, distribution boards and control assemblies. Such cables shall be multi strand copper conductor, PVC insulated of 0.6/1 kV grade, V75. Minimum size 1.5 mm2 for ELV and 2.5 mm2 for LV. All cable ends shall be identified by clip on markers to approval. Adhesive markers are not acceptable. The numbering shall be shown on the "as built" circuit diagrams and no number shall be duplicated on the same unit unless additional distinguishing markers are added. Cable end lugs shall be fitted for termination at terminal posts, studs and similar locations. A separate lug shall be provided for each cable end. Control fuses where practical shall be mounted on busbars, otherwise shall be as close as possible to the busbars and installed with busbar links. Functional units (outgoing) of 100 A rating and above, shall be of the Nilsen or approved, installed in tiers with 30% spare spaces (minimum). Busbars shall be extended to these spare spaces. Functional units rated at 800 A and above shall be air circuit breaker type. Ammeters, voltmeters, in-house kWh and power factor meters shall be installed on all main switchboards, incoming and outgoing supplies. Confirm the requirements with the Manager, Engineering and Maintenance Branch and previous Clause 6.A.3.2. All ammeters and voltmeters shall be selected type such that normal deflection is 80% of the full scale range. Voltmeter with selector switch and 3 ammeters with maximum demand indicator shall be provided on main switchboard incoming supply.



Appendix 6.A (Cont) Mechanical services boards and control assemblies shall be fitted with "hour-run" meter to monitor plant run hours. Shop drawings shall provide the following information: Full details of cabinet construction and dimensions including its IP rating. Method of support busbars and equipment. Form of construction to A.S. 13439. Description of materials. Busbars dimension and ratings. Internal wiring sizes, ratings and route. Size and wording of labels. Wiring diagrams and schematics of instrument protection and control circuits. Front elevation of switchboard. Vertical section through each compartment. Sheet metal details. Weights of switchboard. Location for the future extension of busbars. Labelling shall be provided on all switchboards. Main earth electrode where installed shall be shown on "as built" drawings. Suitably hinged frame(s) or as built drawings shall be provided in the main switch room showing the layout and schematics of the main switchboard.

6.A.4.3 Distribution Switchboards Distribution switchboards shall generally be proprietary type boards with similar requirements as applicable to that of main switchboards. Distribution switchboards shall be constructed to Form 1 assemblies. Distribution switchboard shall be: Equivalent to Cutler-Hammer, Quicklag or NHP Terasaki circuit breaker type. Provided with centre main switch. Distribution switchboard (including load centre) shall be

protected by fuses or circuit breaker at the upstream. These protective devises shall be rated NOT less than 60 A.

Provided with separate sections for time clocks, contactors, relays and other equipment. Provided with separate sections for lighting and power. Provided with bottom mounted neutral and earth bars. Neutral and earth bar shall be

provided with equal number of tunnels (to phase circuits) for terminals including spares and labelled.

Provided with escutcheon plate which shall be hinged. Plates greater than one metre high shall be four point locking, or in two separate hinge plates.

Provided with lockable doors (keyed to CL001). Where distribution switchboard is located in dedicated cupboards, switchboard doors need not be provided.

Provided with labelling



Appendix 6.A (Cont) The requirements of energy management may require a separate distribution board for its control of lighting, including the installation of contactors, relays, and other equipment for its total operation. As an alternative, distribution switchboard cupboards shall be provided with space for the mounting of such control equipment, including in-house meters. Such space shall include future capacity. Miniature circuit breakers (moulded case) shall incorporate both thermal and magnetic tripping mechanism, with visual indication in the centre tripped position. The interrupting capacity for the maximum prospective fault current shall be not less than 6 kA. Circuit breaker rating shall be minimum 20 A. Spare capacity shall be not less than 50% of installed outgoing protective devices. Busbars shall be extended to these spare spaces. Generally these boards serve final subcircuits; it is required that further to legends, a schematic and floor layout plans shall be included which identify the circuits, lighting, power, RCDs and other specialised items.

6.A.4.4 Contactors All contactors shall be suitable for AC3 utilisation and shall have a minimum current rating of the protective device. Contactors shall be capable of withstanding the let through current of the protective device preceding it. Contactors rated at 20 A and above shall be mechanical latching type.

6.A.4.5 Switches and Isolators Switches and isolators rated at 100A and above shall be fault make and load break type. The prospective fault-level must have a corresponding peak value of at least 2.1 times the RMS value. Equipment shall have double make and break contacts.

6.A.4.6 Monitoring Systems Refer to clause 08.00 for further requirement to switchboard equipment requiring contacts, links and/or transducers.

6.A.4.7 Time Switches Time switches shall be simple in operation and in programming the On/Off functions. Contacts shall be rated at 20 A minimum. Time switches shall be a minimum seven (7) day operating device with 48 hour battery operated reserve. By-pass switch shall be provided for Manual/Off/Auto operation. Refer to clause 6.A.6.8.

6.A.4.8 Load Centre Type Switchboards Equipment provided for load centre type switchboards shall generally comply with clauses as specified for distribution switchboard. Busbars arrangement with adequate support shall be for three phase circuit breakers. Neutral and earth bars shall be provided, sized for equal number of poles. Main switch shall be provided. The number of poles shall in no case be less than 12 excluding main switch. Switchboards shall be easily expandable when another chassis is added.

6.A.4.9 Indicating Lights Indicating lights installed in all switchboards shall be of the encapsulated transformer type suitable for 240 V AC and employing a 6 V MES lamp. Minimum size of lamps shall be 25 mm.



Appendix 6.A (Cont) 6.A.4.10 Schedule Cards

All distribution switchboards shall be provided with type schedule cards showing its circuit number, connected equipment, destination and location. Schedule card shall be located within the distribution board. In a refurbished area, the total schedule card shall be retyped to include the existing services.

6.A.4.11 Fuse Cartridges All fuses shall be HRC cartridge type. Spare cartridges for each rating shall be provided for each switchboard unit installed. Spare cartridges shall be mounted on a suitable rack. At the main switchboard position, fuses shall be located in a wall mounted enclosure in the switch room. At distribution boards, the fuses shall be mounted in a convenient location in the respective cupboards.

6.A.4.12 Control panels and equipment on distribution switchboards Sprecher and Schuh contactors or equal approved, panel mounted control switches, shall be specified. Contactors, relays, control switch etc. shall be DIN-Rail mounted. 50% spare capacity shall be provided on the panel for future expansion. All cables shall be identified by number ferrules at each termination including field termination. Equipment within the panel shall be logically laid out and labelled. There shall be sufficient space between items to permit safe maintenance a minimum of 50 mm between contractors. Automatic controls shall be mounted external to the switchboard in a separate cabinet containing only extra-low voltage wiring; control wiring entering the switchboard shall be insulated to the appropriate ratings. There shall be adequate cabinet ventilation to ensure against temperature rise and thermal overload operation. Circuit breakers are preferred in lieu of HRC fuses. Schematic diagrams, complete with wire numbers, shall be installed at each control panel.

6.A.5 MAINS, SUB-MAINS AND WIRING

6.A.5.1 General All cabling shall have stranded copper conductors and shall be insulated with 0.6/1kV grade PVC compound type V75 or higher, unless specified otherwise. Insulation coloured code shall be as follows: Active phase red. Active phase white. Active phase blue. Neutral black. Earth green or green/yellow. Double insulation colour code shall be as follows: Lighting white. Power black. Fire services red. Others as specified and approved Aluminium conductors shall not be used.



Appendix 6.A (Cont) All cables shall be new, unless specified otherwise. All cables shall be brought to the site in their original packages with their labels intact, otherwise they shall be rejected. All wiring in which kinks or abrasions occur shall be condemned and shall be replaced at no cost to RMIT. All neutral cables shall have the same current rating and size at the active phase (s). Existing cabling, conduits and accessories not satisfying all current Australian Standards shall be replaced. All redundant wiring and equipment shall be totally removed.

6.A.5.2 Installation Single core mains and sub-mains cable shall be installed in trefoil formation, on parallel paths, with proper radiused curves of not less than six times the cable diameter. Different sets of mains or sub-mains cable installed in the same route on cable trays or ladder shall be spaced to avoid derating. All penetrations of wiring through floors, ceilings and walls shall be fire stopped to approval. All wiring shall be installed so that it can be readily renewed, repaired or relocated without affecting building finishes and construction. Wiring for other systems, e.g. MATV, public address, telephone, etc., shall be installed in a similar manner to light and power wiring in the same area. Communication cables, where run parallel to light and power cables shall be spaced to a minimum of 600 mm for length greater than 10 m. Cable runs shall be installed parallel or right angles to building structure and planning grids. Cables radiating from distribution switchboards shall be neatly installed on cable trays or enclosed duct. Grouping of cables, (final sub-circuits) in excess of 10 circuits, shall be installed on cable tray over common routes. Other cabling shall be adequately fixed and supported with purpose made clips, cleats or saddles. Joints are not permitted. Loop-in and loop-out principle for connection of final sub-circuits. Catenary wire used for the support of cables shall be properly supported. In concealed space, fixing of cables to catenary shall not exceed 1200 mm spacing. Catenary wire shall not be supported on false ceiling suspension. Vertical runs of all cables shall be supporting at spacing not exceeding 1500 mm. Catenary wire shall not be used as an earthing conductor. Cables shall be installed above ducts, pipes and other building components which may become dislodged and cause interference to the cables. Where necessary, cabling installed under such services shall be rated as WS33. Minimum cable size for light and power shall be 2.5 mm2. All cabling shall be concealed, unless stated otherwise. Unsheathed cables can only be installed in conduit.

6.A.5.3 Mineral Insulated Metal Sheathed (MIMS) Cable MIMS cable shall be installed by qualified tradesmen suitably skilled in this work. Installation shall be to manufacturer's recommendations. MIMS cables shall be fitted with cold seal pots, suitable glands, sleeving lugs and saddles. Support with copper saddles shall be spaced at maximum 600 mm centres. MIMS cable shall be 1kW 1kV grade. ESR system shall be approved. Sheath shall be copper.



Appendix 6.A (Cont) 6.A.5.4 Fire Rated Cables

Fire rated cables shall be of the approved circular type. Colour of sheath shall be red. Cables shall be of the 90C temperature rated type or higher. Installation shall generally be similar to that of PVC cables.

6.A.5.5 Bus Ducts Bus ducts shall generally be used for mains cabling and for demand in excess of 1600A per phase. Easy installation of bus duct over acceptable route shall be provided for maintenance and extension. Acceptable bus duct manufacturers are Square "D" and Pyrotenax or equivalent.

6.A.5.6 Cable Termination Cable termination lugs shall be installed on all conductors except where tunnel terminals are provided on equipment. Lugs shall be copper installed with a ratchet type crimping tool. Sub-mains earth cables (including cables of 4 mm2 and above) shall be terminated to approval with locking nuts.

6.A.5.7 Final Sub-Circuit Connection Subject to the size and loading for a given circuit as required by the Wiring Regulations the maximum number of points per 2.5 mm2 circuit shall be as follows: Lighting 25 (typical 2 x 36 W luminaires) or not more than 2.0 kW connected load. Power 6 (single Switched Socket outlets in non-air conditioning building). 12 (single Switched Socket outlets in air conditioning building). Note: Subject to specialised areas where equipment load demands are low and are considered permanent, the number of points can be extended. The total connected load of the equipment for that power circuit shall not exceed 70% of the rated protective device. Typical situations are switch socket outlets for computer laboratories and classrooms. Ensure that these switch socket outlets numbered and with their circuit identification. Individual circuit for each item of permanently connected equipment. Individual circuit for each 15 A switched socket outlet. Combined lighting and power in a circuit will not be permitted. Wiring to permanently connected appliances which vibrate or may be moved shall have terminating conductors protected by flexible conduits of length as short as possible. Wiring to permanently connected static equipment which is unlikely to be moved in service, except by skilled tradesmen, shall have terminating conductors protected by screwed steel or rigid uPVC conduit to suit the particular application. Refer to clause 06.04 for isolators required for permanently connected equipment. Each final sub-circuit shall be installed with earth cable directly connected to their respective distribution switchboard earth bar and labelled. Common earth cable with tee off will NOT be permitted.

6.A.5.8 Voltage Drop

Voltage drop between the point of supply and the last connected equipment at its worst case shall be limited to a maximum of 5%. Voltage drop shall be not more than 2% between the point of supply to distribution switchboards or control assemblies.



Appendix 6.A (Cont) 6.A.5.9 Derating of Cables

Generally, groups of cables shall be installed to avoid derating as far as practical. Sub-mains cables including parallel cables installed shall be adequately spaced on cable ladder or cable tray to avoid derating.

6.A.5.10 Tee-Off Boxes Tee-off boxes, as required for connection of sub-mains shall be provided with fuses or links. Construction shall be for easy access of the equipment from the front. Tee-off boxes shall be of the approved type.

6.A.5.11 Power Factor Equipment installed in buildings shall maintain a power factor not less than 0.9 lagging. Where installed equipment is found to be less than 0.9 lagging, such rectification will not be a variation to the contract and at no cost to RMIT.

6.A.5.12 CASCADING AND DISCRIMINATION Fuses and devices installed in a system shall cascade and discriminate with the upstream protective unit. Further to the requirement of clause 03.03, the minimum protective device for distribution switchboards (and load centres) servicing final subcircuits, shall be rated at 60 A. Therefore, all upstream shall provide these similar elements.

6.A.5.13 Conduit Installation All conduits shall be nominal diameter of approved manufacturer and shall be circular in section. All conduits shall be installed on the "draw-in loop in" system. No wiring shall be installed until all the conduits with draw wires have been installed. All conduits shall be in long lengths, straight. Manufactured bends and tees shall be kept to a minimum. Conduits shall be neatly run and securely fastened by means of approved saddles at intervals not exceeding 600 mm and lesser spacing to eliminate sagging. Saddles shall be provided within 150 mm of all fittings or terminations. All burrs and sharp edges shall be removed from ends and screwed bushes shall be fitted to the ends of conduit runs. During installation, the ends of conduits shall be temporarily plugged to prevent the ingress of dirt. The direction of conduit run shall be parallel to the wall, floors and ceilings, wherever practicable and no threads shall be visible after erection other than running joints. Running threads shall be thoroughly painted with black enamel for enamelled conduit and with aluminium paint for galvanised conduit. Conduit shall be installed so as to avoid all mechanical duct systems and other pipe systems and services, and shall in all cases, be at least 80 mm from heating pipes, and at least 460 mm from boilers or furnaces. Surface mounting of conduits is to be avoided and routes are to be discussed with the Project Manager and Services Project Manager, Construction prior to documenting. In Heritage buildings Campus Planning is to be consulted and formal approval received prior to installation. Where conduits are exposed to view other than plant room shall be given one coat of primer, then two finishing coats to approval, colour to match surroundings. Where conduits are required to be painted, approved labelling shall be provided at 3 m intervals.



Appendix 6.A (Cont) All junctions and draw-in boxes and fittings shall be installed in a true horizontal or vertical plane. Where boxes are exposed to weather, the lids shall be sealed with an approved gasket. The boxes shall be of ample size to enable the cables to be neatly diverted from one conduit to another without undue cramping. All conduits shall be provided with expansion joint as required. Where conduits are run concealed, the following shall apply: Conduits Cast in Concrete Conduits shall be installed above the bottom re-reinforcing bars. Termination shall be in deep pattern junction boxes for ceiling outlets embedded in concrete and/or steel wall boxes for all flush wall outlets and switches. Subject to the approval of the Structural Consultant, generally conduits shall be installed in the centre of concrete slabs. The Services Project Manager, Construction shall be notified on completion of each section of conduit and prior to pouring of the concrete so that the work may be inspected and marked on "as built" drawings. Crossings of conduits shall be avoided if an alternative route exists. Conduits in slabs shall be spaced apart by not less than 75 mm over the conduit and its fittings. Where conduits are buried in concrete, plaster, etc., they shall be adequately sealed and protected during pouring and plastering operations and all necessary precautions shall be taken to ensure that no movement of conduit, distortion of the walls or fittings occurs during the placement of reinforcement, concrete, plaster, etc. All damage and movement of conduits shall be made good at no cost to RMIT. Where expansion or construction joint in the concrete occurs an expansion joint shall be made in the conduit with flexible couplings to 600 mm on either side. Conduits Concealed in Plaster Conduits which are installed within hard plaster or concrete render wall finishes shall be securely fixed to prevent movement or vibration and to permit a depth of at least 10 mm of plaster or render to be maintained over the conduit and its fittings. Where necessary, conduits shall be chased or otherwise recessed into walls to ensure that this minimum cover is obtained. In no case, however, will chasing exceeding 35 mm of a single brick wall be permitted. Provide suitable chases during erection of the brickwork. Rigid UPVC Conduit Rigid UPVC conduit must be installed in accordance with the earlier clauses covering requirements for conduits. All necessary precautions shall be taken during construction to protect the conduits from damage or movement from position by equipment being used by the Contractor and other trades. In particular, conduits projecting through floor slabs, walls, etc., shall be adequately protected against damage. Rigid UPVC conduit and fittings shall be of unplasticised PVC (UPVC) manufactured to the relevant Australian Standard. Heavy duty rigid UPVC conduit shall be used for wiring exposed to view and run underground. Conduits shall not be installed in areas subject to ambient temperature in excess of 50C. Conduits shall be fastened to the side of timber batten where installed across rafters or joists in accessible ceilings. Rigid UPVC conduit shall be installed so as to enable cables to be "drawn-in" after erection and boxes to be provided for this purpose. Screwed fittings shall not be used. Joints shall be used with an approved solvent cement. Conduits and fittings damaged during installation or delivery will be condemned and shall be removed from site.



Appendix 6.A (Cont) Flexible Conduit Flexible conduit shall only be provided between fixed conduit and equipment which is likely to be moved or subject to vibration, and its length shall be as short as practical. In no case shall length of conduit exceed 1200 mm. Brass or nylon terminators shall be used. Steel Conduit Steel conduit shall be galvanised where installed in exterior, plant room, service trenches, locations subject to dampness or condensation, and areas as required by Regulations. Wiring system shall be minimum WS33. Electrical continuity shall be provided, and shall be earthed. Conduit shall be cut square, threaded with the minimum number of threads being consistent with the union, painted over the threads with conductive paint, reamed to remove burrs and adequately terminated into threaded connections with no threads showing after assembly. Seals shall be provided in all joints. Fixing at maximum of 1200 mm between centres where installed on surface. Metal Ducts The duct shall have a removable metal cover fixed to the troughing by galvanised metal thread screws with captive nuts located at a maximum of 500 mm centres. The troughing and covers shall be of sheet steel, minimum thickness 1 mm and shall be free from rags, burrs and sharp edges. Electrical continuity shall be provided and earthed. Mitred corners shall be provided with earth cable connections. Edges and cut-outs shall be provided with gaskets securely fixed to the duct. Manufacturer's bends, tees, adaptors, coupling pieces, etc., must be used, except where specials may be required and all bends and tees, etc., must be radial or flat throat pattern. Where specials are required they shall be manufactured to the same standard and finish as specified for cable ducting and trunking including standard accessories. All duct work shall run neatly and squarely on all walls, ceilings, etc. The ducts shall also be installed so as to be inconspicuous by running in corners, etc., and parallel to wall and ceiling edges. They shall be installed in such a manner that the demountable covers are accessible, and shall be adequately supported and the means of support shall be adequate to support an additional load of 70 kg at midspan without permanently deforming the duct. The metal ducts shall be supported by approved means at a maximum of 1200 mm centres. All metal ducts and covers shall be given one coat of zinc chromate primer, then two finishing coats of enamel to approval. Metal ducts are not acceptable for use in locations exposed to the weather. Cables installed in vertical ducts shall be adequately supported by cleating to the enclosure at intervals not exceeding 1500 mm. In no case shall deflection exceed 10 mm. Retaining clips shall be installed to support wiring where the removable cover is on the lower side of the duct. A spare space of 50% shall be provided in any duct enclosure.



Appendix 6.A (Cont) Plastic Ducts Generally, the requirements for this clause shall be similar to metal ducts including the following: Plastic ducts shall be grey colour of rigid UPVC plastic moulded troughing with removable covers of the clip-on type. The troughing and covers shall be robustly constructed from heavy gauge material to avoid sagging between supports and to avoid warping. Ducts shall be supported by approved means at a maximum of 600 mm centres. Rigid UPVC ducts shall not be used where exposed to mechanical damage, weather and temperatures above 50C or moisture. Cable Trays Cable trays shall be perforated sheet steel electro-zinc plated with a minimum of 40% of its surface area open for air circulation. Manufacturer's standard bends, risers, curves reducers and fishplates shall be used. Edges shall be folded type. Trays shall be fixed to approved steel brackets and hangers with deflection not exceeding 10 mm when fully loaded with consideration to future installation of cables. Installed parallel or at right angles to the building structure and planning grids. Trays shall be sized to allow for multi run of different sets of cable including spare capacity. A spare space of 50% of installed capacity shall be provided. Trays shall be electrically continuous and shall be earthed at one end. Sharp edges shall be avoided and at tray ends bushing or grommeting shall be provided. Where practical, cable trays shall be mounted at a height not less than 2300 mm above finished floor level and installed above other services. Adequate access shall be provided to cable trays; a minimum of 300 mm above the tray and 600 mm on one side of the tray for future installation of cables. Cable Ladder The method of installation and general requirements shall be similar to that for cable trays. Approved type ladder shall generally be used for mains and sub-mains. Ladders exposed to weather shall be provided with lids secured by mechanical means. All parts of ladder shall be galvanised, including hangers and brackets.

6.A.6 LUMINAIRES AND INSTALLATION

6.A.6.1 General The level of illumination on the working plane shall be in accordance with the requirements of A.S. 1680. Over illumination shall be discouraged. Particular areas nominated for specialised requirements will be identified by the user and the appropriate lighting levels recommended. Luminaires shall be manufactured from Australian made components and be approved by the Supply Authority. Standard office type luminaires including prototype and emergency luminaires shall have NATA test report. Samples including prototypes shall be submitted before final approval. One sample shall remain on site after approval. Samples shall be complete with lamps, starters, flexible cable, plug top and supports. Incandescent lamps shall not be used. Non-Standard lamps and luminaires shall be used ONLY with prior approval of the Manager, Engineering and Maintenance Branch.



Appendix 6.A (Cont) All luminaires shall have appropriate diffusers easily removable and all components shall be easily accessible for maintenance purposes. Luminaires mounted below 2500 mm above floor level shall be of the protected or vandal-resistant type. Luminaires required to be dismantled in order to replace lamps shall not be used. Luminaires shall be high efficiency type and the light output ratio shall not be less than 60%. Layout design shall satisfy the intensity requirements for open offices and shall have sufficient flexibility for relocation due to partitioning of individual perimeter or island offices. Lobbies, foyers, public thoroughfare and external lighting shall generally be illuminated by high intensity discharge luminaires. Mounting of any luminaires greater than 4 m high above floor level that are not easily accessible shall not be specified or installed. Recommendations to the use of cherry-pickers or scaffolding for maintenance purposes shall be avoided. All recessed luminaires shall be provided with 1500 mm PVC flexible cable fitted with plug top. Luminaires in car parking areas, plant and other services rooms shall be protected type. In plant rooms, luminaires shall be mounted below services and under no circumstances be mounted below 2100 mm above floor level. All surface and suspended luminaires shall be supported at two points. Illumination above these luminaires shall be at least 30% of the downward component. Luminaires shall be left in a clean, operating and undamaged condition at the time of Practical Completion. Repair and/or replacement of luminaires which may be damaged whilst in his charge will not be a variation to the contract. The number of luminaires incorporating 2 x 36 W fluorescent lamps connected to a final subcircuit shall not exceed 25 or 2.0 kW of connected load. Labels shall be provided on all luminaires indicating manufacturer's name, lamp size, and type number. Labels shall be concealed from normal view. High level of third harmonics created by luminaires shall be eliminated. Fuse and fuse carrier shall be provided to all luminaires, combined with their terminal block. Generally 2 A rated fuse shall be used. Noise and vibration in all luminaires during operation shall be kept to a minimum. Where sound pressure levels are deemed unacceptable, luminaires will be replaced at no cost to RMIT.

6.A.6.2 Fluorescent Luminaires (Refer also to section 6.4 Further to the general requirements, fluorescent luminaires shall be designed and be suitable for operation of both 26 mm and 38 mm diameter fluorescent lamps. Colour temperature shall be better than 3000K (including compact fluorescent lamps). Nominal lamps life shall be better than 5000 hours. Lumens output for a 36 W fluorescent lamp shall be minimum 2700 after 100 hours operation. Maintenance factor of 0.8 shall be considered.



Appendix 6.A (Cont) In the new generation of lighting and energy conservation, it is recommended where possible, triphosphor lamps shall be sited, as being the preferred lamp to the standards as described above. To further enhance the requirement, 28 watt lamps should be considered as its output is equivalent to 2900 lumens. In all cases glare and uniformity shall be observed to comply with AS1680. Different lamp manufacturer throughout the installation shall be avoided, and shall be equivalent to the existing installed lamps where appropriate. Compact fluorescent lamps shall be GE Biax or Woltan type. Lamps with overall length greater than 200 mm, mounted horizontally, shall be supported at the "U" shape end. The metal chassis of fluorescent luminaires shall be constructed of 0.9 mm thick prime quality, bright planished sheet steel free from surface blemishes, scale and corrosion. Subject to approval, a lighter gauge metal could be used if the shape and manufacture of the luminaires incorporate adequate stiffeners, folds or ribs to prevent warping or sagging. Full details of this construction shall be submitted with Tender. All seams and joints shall be continuously welded, ground flat, filled and rubbed smooth. Sharp edges shall be avoided. Office type luminaires shall be provided with gear tray and/or removable cover for auxiliary equipment and wiring which shall be separated from the lamp(s) compartment. Auxiliaries shall be mounted on the back of this cover (reflector) or tray. The reflector shall be fitted with removable chains or nylon cord to allow for the initial partial lowering of the reflector. It shall be possible to readily disconnect the wiring and chains, and then completely remove the reflector. Reflectors and appropriate auxiliary channels shall be securely fixed to the body of the fitting with a minimum of four screws to prevent sagging. Holes in the metal backplate of the luminaires shall not be used for the mounting of control equipment and cable assembly. Where required, holes shall be a minimum. Cable entry holes shall be provided at the centre for wiring and shall be grommeted or bushed. All other holes shall be filled in to prevent entry of dust, insects and the prevention of light leakage. Recessed 2 x 36 W or 2 x 18 W luminaires shall be capable of "back-to-back" installation. Low brightness louvres and prismatic diffusers can be interchangeable in any typical office type luminaires. Louvres shall be positioned above lamps. Recessed luminaires, when fixed in position, shall provide no gap between its body and the ceiling "T" bar or between diffuser and fitting. Sagging of diffuser will not be allowed. The paintwork of fluorescent luminaires shall be applied after all surfaces are thoroughly cleaned back to the parent metal. Luminaires shall be etch-primed, undercoated and spray painted with two coats of wet on wet, high reflectivity, gloss acrylic white paint, heat dried to give a total cover of not less than 0.035 mm thickness to both internal and external surfaces. Capacitors shall be provided to all luminaires. The power factor shall be not less than 0.9 lagging. Ballast for fluorescent luminaires shall be provided for each lamp and shall have class H insulation to copper windings. Minimum spacing between ballasts shall be 75 mm and 100 mm from capacitor. Unless specified otherwise, ballast shall be suitable for switch-start type with hot loss operation limited to the following: Lamp Maximum ballast loss.

Ramp (W) Ballast

7.9 3.5

18 5.5

36 5.5



Appendix 6.A (Cont) Electronic ballasts and starters, subject to approval, can be used. Internal wiring of fluorescent luminaires shall be 105oC (minimum) 250 V grade, PVC insulated colour coded cable of minimum 1.0 mm2. Cross sectional areas wiring shall be neatly secured within the luminaires clear of all control gear. Adhesive tape shall not be used for looming and securing cabling. Terminal block shall be provided mounted adjacent to cable entry and of adequate size to accommodate these cables and as well, a maximum size of 4 mm2 conductors. Terminal block shall be provided with fuse carrier. Wiring exposed shall not be concealed from where practical, e.g. luminaires with louvres and including removable prismatic diffusers. Lamp holders shall be suitable for both 26 mm and 38 mm diameter standard fluorescent lamps. Holders shall be proprietary type of moulded construction with plastic rotor and moulding for lamp pin separation. Starter holders shall be fixed in position with screws and nuts and positioned so that starter is readily removed without removing the gear cover. Non-tracking starters shall incorporate radio interference suppression capacitor and be capable of 5000 operations, minimum. Wrap around prismatic lens panels shall be of one piece construction. Appropriate end caps shall be provided. Opal diffusers shall not be used. Prismatic lens shall be injection moulded type. Metal or plastic type louvres shall generally be the ultra-low brightness suitable for screen-based task work area. Such areas will be defined by the user. Louvres shall be of the self cleaning type, without dust accumulation. Protective gloves shall be used for the installation of these louvres.

6.A.6.3 High Intensity Discharge Luminaires Chassis shall be substantially fabricated to ensure rigidity. Ferrous components treated to prevent corrosion and designed to promote adequate cooling. Recessed or high bay type luminaires with lamp wattage greater than 100W, shall be chain or rod suspended from the upper floor slab with safety chain. Where ceiling is inaccessible, luminaires shall be provided with a minimum of three spring adjustable loaded clips for fixing into the ceiling trimming and adjacent remote mounting of control gear. Other discharge type recessed down lights shall be mounted with a minimum of two spring adjustable loaded clips. Lamp holders shall be E27 (ES) or mogul porcelain type. Internal wiring of luminaires shall be 1.0 mm2 stranded copper cable. Glass insulation of class C shall be used. Control gear shall include power factor capacitors corrected to not less than 0.9 lagging. Gear and terminal block shall be an integral part of the luminaires. A 2A class Q1 fuse in a fuse carrier and base shall be connected. Lamps and/or control gear perceived to show "flicker" shall be replaced. Preference shall be given to constant wattage type ballast. Luminaires shall be provided with flexible cable and plug top. Lamps Mercury vapour lamps shall be the deluxe white type with 24000 hours average rate life and nominal colour temperature of 4000K. High pressure sodium lamps shall be deluxe type with 12000 hours average rated life and nominal colour temperature of 2200K. Colour rendition (Ra) equivalent to 65. Metal halide lamps shall be equivalent to Venture pro-arc and super pro-arc lamps. Average rated life shall be not less than 10000 hours and nominal colour temperature of not less than 3700K. Double-ended lamps shall not be used.



Appendix 6.A (Cont) 6.A.6.4 Extra Low Voltage (ELV) Wiring and Installation

Extra low voltage installation shall be installed only where approved by the Services Project Manager and have a minimum clearance of 300 mm from any low or medium voltage equipment. Thermal insulation shall not cover any part (or touching) the ELV installation. Luminaires mounting and cabling size and length shall be in accordance with the manufacturer's recommendation. A minimum of 50 mm spacing all round the luminaires shall be free from any insulation. Individual transformer of 5% regulation or better shall be provided to each ELV luminaires. Transformer shall be provided with fuse in the primary circuitry and shall be easily accessible. Mounting bracket shall be provided to allow for adequate cooling. Laying on plaster board ceiling space will not be permitted. A permanent label showing the specified lamp wattage shall be installed on each luminaires. Label shall be clearly visible when lamp is removed. Where dimming of ELV lamps is required, the dimmer unit shall incorporate the following: Soft start Digital control Halogen clean-up cycle In-built surge protector Internal time clock RF suppression ELV dimmer shall be selected from the DYNALITE range or similar University approved. Extra low voltage (12V Dichroic halogen lamp) luminaires shall have nominal average life better than 3,000 hours. Miniature E.S. type globes are to be specified.

6.A.6.5 Area Lighting Control The later clauses regarding energy management shall be considered, but the basic lighting control shall be as follows: Luminaires located near windows shall be grouped to one switch circuit. Other areas, control shall be circuited to alternate luminaires. Security lighting shall generally be provided at corridors and intersections. In large open

areas, spacing should be at every 25 m. Dimming and/or time switch controls for the dot point items (1) and (2) above shall be

provided. Plant rooms, corridors, foyers, lobbies and other service areas control shall also be circuited

to alternate luminaires. Stair lighting, on each floor, shall be time-switch controlled, to the satisfaction of the Building

Code. One circuit shall be provided for luminaires located on each floor and a separated circuit for

luminaires located on each intermediate landing. Time switching for corridors, toilets, foyers and lobbies shall be to approval.



Appendix 6.A (Cont) An economical means of automatically switching OFF luminaires after use in office areas,

lecture theatres, libraries and classrooms shall be considered.

6.A.6.6 Light Switches Switches shall be a 240 V 15 A rated rocker operation mounted horizontally under a moulded impact resistance plastic single piece flush plate. Where four or more switches are located adjacent to each other, they shall be ganged under a common stainless steel flush plate. Stainless steel plates shall be a minimum of 2.5 mm in thickness and engraved to indicate the purpose of each switch. Where separate circuits are provided to this plate, total segregation shall be provided and internally labelled. Switches shall be located on the lock side of door frames. In plant rooms, switches shall be protected type. Where located externally and in damp situations, switches shall be IP55 rating. In masonry walls, pressed steel wall box shall be provided. Metal bracket shall be fixed to stud partitions. Shrouds shall be provided where located within metal door frames, walls or the like. Circuit number labelling shall be provided.

6.A.6.7 Light Sensitive Switch Light sensitive switch rated at 20A shall be suitable for switching the controlled lighting systems at an adjustable illuminance of 10 to 50 lux minimum, incorporate time delay to prevent unwanted operation during transient lighting conditions. Switch shall be adequately positioned for dusk-to-dawn operation. This equipment shall be indicated on as built document as appropriate.

6.A.6.8 Time Switches for Lighting Time switches shall be of the solid state controller suitable for 365 days operation. Operating functions shall be simple for the programming of the On/Off functions. 20 A contacts and 48hour battery reserve shall be provided. Time-switches shall be an approved type, located within switchboard or its vicinity. This equipment shall be i

Section 6 Electrical Services

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Transcript of Section 6 Electrical Services