electrical service minimum requirment

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ELECTRICAL SERVICESMINIMUM REQUIREMENT

(Referred to as MEW E101)

Part

General1 Installation2 Switchboards and Associated Equipment3 Accessories4 Luminaires - Supply and Installation5 Electric Motors6 Painting, Colour Coding and Labelling

September 2007


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DOCUMENT OWNERSHIP

CROWN COPYRIGHT:

No part of this work may be reproduced or copied without the written permission of thepublisher. This document is published by NSW Water Solutions, NSW Department of

Commerce, 2-24 Rawson Place, Sydney 2000.

ACCREDITATION:

Only design consultants who have attended the NSW Department of Commerce

Accreditation Course and are accredited by the NSW Department of Commerce for

MEWE101 usage, are legally permitted to use this document as part of design

documentation.

A fee for such usage per project will apply.

This Accreditation would be reviewed every 3 years or when this document is updated,

whichever is the earlier.

Apply to the Senior Electrical Engineer, NSW Department of Commerce, McKell

Building, 2-24 Rawson Place, Sydney 2000 (Tel 937 28162) for accreditation.


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Part 0 - General

MEW E101 Page 1

PART - GENERAL

0.1 SCOPE

This document covers the minimum requirements for Low Voltage and Extra Low VoltageSwitchboards and electrical installation for Sewage and Water Supply Schemes.

Read this document in conjunction with the specification clauses and exhibited drawingsas well as relevant standards.

Should a higher or more onerous standard requirement be specified in the Service andInstallation Rules of New South Wales than is specified in MEW E101 or in thespecification clauses and/or exhibited drawings, then that higher or more onerousstandard requirement shall apply.

Should a higher or more onerous standard/requirement be specified in AS/NZS3000 thanis specified in MEWE101 or in the specification clauses and/or exhibited drawings, then

that higher or more onerous standard/requirement shall apply.

0.2 USER GUIDELINE FOR THE SELECTION OF SWITCHBOARDCLASSIFICATION

Switchboard classifications are defined in this document.

The correct classification for the electrical installation should be specified in the mainbody of specification clauses or on the exhibited drawings.

The selection of the correct classification is dependent on a number of criteria such as:

Fault level

Importance of the installation

Standby arrangements

Supply Authority requirements

Risk and Consequences of a major fault

Acceptable time to restore services in the event of a major fault

Incidence of lightning

Type of equipment installed in the Switchboard.

Only design consultants who have attended the NSW Department of CommerceAccreditation Course and are accredited by the NSW Department of Commerce for MEWE101 usage, are legally permitted to use this document. A fee for the use of thisdocument per project will apply.


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Part 0 - General

Page 2 MEW E101

0.3 STANDARDS

AS 1000 The International system of Units (SI) and its applicationAS 1023 Low Voltage Switchgear and Controlgear - Protection of Electric MotorsAS 1029 Low Voltage Contractors

AS 1042 Direct-acting Indicating Electrical Measuring Instruments and their AccessoriesAS 1100 Technical DrawingAS 1102 Graphical symbols for ElectrotechnologyAS 1103 Diagrams, Charts and Tables for ElectrotechnologyAS 1110 ISO Metric Hexagon Precision Bolts and ScrewsAS 1111 ISO Metric Hexagon Commercial Bolts and ScrewsAS 1125 Conductors in Insulated Cables and Flexible CordsAS 1202 AC Motor Starters (up to and including 1000V)AS 1220 Aluminium Conductors Steel Reinforced for Overhead Power Transmission PurposesAS 1284 Electricity MeteringAS 1345 Identification of the contents of piping, conduits and ductsAS 1359 Rotating Electrical Machines - General RequirementsAS 1360 Rotating Electrical Machines of Particular Types or for Particular Applications

AS 1417 Rules for Antennas for the Reception of Radio and Television Broadcasting for theRange 30 to 1000 MHz.AS 1431 Low Voltage Switchgear and Controlgear - Control Circuit Devices and Switching

ElementsAS 1531 Aluminium Conductors for Overhead Power Transmission PurposesAS 1580 Paints and Related Materials - Methods of TestAS 1627 Metal Finishing - Preparation and Pre-treatment of SurfacesAS 1648 Visually Stress Graded Cypress Pine for Structural PurposesAS 1650 Hot-dipped Galvanised Coatings on Ferrous ArticlesAS 1675 Current Transformers - Measurement and ProtectionAS 1746 Hard-drawn Copper Conductors for Overhead Power Transmission PurposesAS 1882 Earth and Bonding ClampsAS 1930 Circuit Breakers for distribution Circuits (Up to and including 1000 V ac and 1200 V ac)AS 1939 Degrees of Protection Provided by Enclosures for Electrical EquipmentAS 2005 Low Voltage Fuses - Fuses with Enclosed Fuse-LinksAS 2052 Metallic ConduitsAS 2053 Non-metallic Conduits and FittingsAS 2184 Low Voltage Switchgear and Controlgear - Moulded Case Circuit-Breakers for Rated

Voltages (up to and including 600 V ac and 250 V dc)AS 2648 Underground Marking Tape - Part 1 - Non-detectable TapeAS 2700 Colour Standards for General PurposesAS 2768 Electrical Insulating Materials - Evaluation and ClassificationAS 3000 SAA Wiring RulesAS 3008 Electrical Installations - Selection of Cables

Part 1 - Cables for alternating voltages up to and including 0.6/1 kVAS 3012 Electrical Installations - Construction and Demolition sitesAS 3013 Electrical Installations - Wiring Systems for Specific ApplicationsAS 3100 Approval and Test Specification - General Requirements for Electrical EquipmentAS 3111 Approval and Test Specification for Miniature Overcurrent Circuit-BreakersAS 3112 Approval and Test Specification - Plugs and Socket-outletsAS 3117 Approval and Test Specification - Bayonet Lamp holdersAS 3126 Approved and Test Specification - Extra Low Voltage TransformersAS 3131 Approval and Test Specification - Plugs and Socket-outlets for Use in Installation Wiring

SystemsAS 3133 Approval and Test Specification - Air Break SwitchesAS 3137 Approval and Test Specification - Luminaires (Lighting Fittings)AS 3140 Approval and Test Specification - Edison Type Screw Lamp holdersAS 3147 Approval and Test Specification - Electric Cables - ThermoplasticAS 3190 Approval and Test Specification - Residual Current D (current operated earth leakage

devices)AS 3191 Approval and Test Specification for Electrical Flexible Cords


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Part 0 - General

MEW E101 Page 3

AS 3300 Approval and Test Specification - General Requirements for Household and SimilarElectrical Appliances

AS 3439.1:2002

Low Voltage Switchgear and Controlgear Assemblies

AS 3760 In-service Safety Inspection and Testing of Electrical EquipmentAS 3766 Mechanical Fittings for Low Voltage Aerial Bundled Cables

AS 3947.3 Air Break Switches, Isolators and Fuse Combination Units (1000v AC and 1200 V dc)IEC 96-3 Radio-frequency cables

Part 3 - General requirements and tests for single-unit coaxial cables for use in cabledistribution systemsService and Installation Rules of NSW, October 2006 (issued by the Department ofEnergy, Utilities and Sustainability)

HB 243 Australian Regulatory Arrangement HandbookHB 29 Communication Cabling HandbookNOHSC:1001

National Standard for Manual Handling

Occupational Health and Safety Regulation 2001

Carry out all work in accordance with the above standards.

The latest editions of the above are to be used unless otherwise specified. Where astandard has been superseded, the latest standard shall be used.


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Part 1 -Installation

MEW E101 Page 5

PART 1 - INSTALLATION

101 SETTING OUT OF RUNS

Apply the following minimum requirements when setting out the work:

(a) Fix cables and conduits parallel to building members, walls, doors, etc. and run onthe square wherever possible. In slabs, conduits may be run diagonally.

(b) Unless otherwise indicated, cable from below any circuit supplying floor mountedequipment. Conduits shall not be surface mounted on floors. They shall instead besunk or concealed under floor boards or in concrete floor slabs.

(c) Run in separate conduits circuits originating at different switchboards.

(d) Locate cables and conduits run in roof spaces below the roof heat insulation andsarking and run above the insulation, or if insulation is not installed, derate thecables in accordance with AS 3008.1 for an assumed ambient temperature of55oC.

(e) Protect surface or recessed wiring in TPS cables to switches, outlets and similar

terminations by conduit drops sized to accept the TPS cables and originating at anaccessible point in the roof space.

(f) Arrange all cables and conduits to run parallel to floors and building members.

(g) Install TPS cabling so that it may be fully replaced. Where TPS cabling passesthrough an inaccessible space it shall be capable of being drawn through thespace such that rewiring can be readily performed.

Note: This may require the installation of conduit through the space.

(h) Install site reticulation cables in underground conduits unless stated otherwise.Direct buried cables are not permitted. Lay underground pipes straight withminimum deviation from the horizontal and vertical planes but graded for drainage.TPI cables are not permitted underground.

(i) No conduits allowed in the floor slab of boiler rooms.

102 PENETRATIONS

102.1 Generally

Use mortar of a 3 : 1 sand cement mix with surfaces "Bondcreted" prior to applying themortar for repairs to all penetrations and repairs.

No penetrations through damp courses are permitted.

102.2 Penetrations Through Waterproof MembranesPipes which enter a building at ground level shall run under the waterproof membraneand vertically penetrate the membrane and the concrete slab at the appropriate position.

Where pipes pass through roofs, proprietary sealing shall be provided between the pipesand the waterproof membrane.

102.3 Penetrations Through External or Existing Structures

Where pipes pass through external walls, existing ground floor slabs or existing groundfloor beams, a penetration 10 greater than the pipe diameter shall be provided. Thepenetration space around the pipe shall be made waterproof by using a proprietarysealing method.


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102.4 Unenclosed Cables Passing Through Slabs

Unenclosed cables in slabs are not permitted.

103 AERIAL RETICULATION (POWER)

103.1 Attachment to Poles

Attach aerial conductors to poles by:

(a) Pin insulators mounted on a horizontal crossarm provided that the conductors donot change direction by more than 10 degrees, or

(b) Shackle insulators secured by hooks on poles and bolts on crossarms at tee-offs,terminations, and other locations. These shackle insulators shall be fixed withgalvanised nuts and bolts.

(c) Where aerial bundled conductors are used, terminate in accordance with AS 3766.

Conductors shall be fastened to pin insulators with tie-wire of 2.5mm stranded black

insulated building wire or a suitable proprietary fixing method.

103.2 Attachment to Buildings

Attach aerial conductors to buildings with shackle insulators and the shackle support shallbe bolted to masonry or a structural member. Pass the conductor through or around theinsulator and then around itself. Alternatively, a proprietary fixing method may be used.

Conductors shall enter the building via a conduit sloping upwards into the building at aminimum angle of 45 degrees to the horizontal for weatherproofing.

Where upstands are required, they shall be of a proprietary manufacture acceptable tothe Supply Authority for service attachments.

103.3 Poles

103.3.1 Generally

Unless otherwise indicated, poles shall be hardwood.

Provide where required by the Supply Authority, a weatherproof box and/or service fuses.

Protect cables and conduits running down the exterior of a pole to a height of 2000 aboveground by a galvanised water pipe for conduits under 40 or a 3.2mm thick hot dippedgalvanised channel fixed to the pole for all other conduit sizes. Extend the protection 150below the surface.

Bury, unless otherwise indicated, poles to a minimum depth of 1600.

Baulk and stay to prevent leaning or bending where poles will be subject to bendingstresses, e.g. where the aerial cables change direction or terminate.

103.3.2 Hardwood Poles

Provide only dressed, natural round poles with all sapwood removed treated againstfungus and termites as described in the Wiring Rules to 600 above ground level.

An alternative fungus treatment may be used only with the approval of the SupplyAuthority and the Superintendent. This alternative treatment requires that the soil aroundand beneath the pole be treated with creosote during the ramming and setting process.The pole shall be liberally coated with creosote from the base to 600 above ground level.

Fit all poles with a galvanised steel domed cap extending 25 down the sides and fastenedat the side with galvanised steel nails.

103.3.3 Crossarms


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Notify the Superintendent of required inspections two (2) working days prior to theinspection.

104.1.3 Backfilling and Reinstatement

Bed PVC conduits on 50 minimum of clean sand and cover by a further 50 of clean sandbefore backfilling the trench.

After laying the conduits in unpaved areas, backfill the trench and consolidate to about 10above the natural ground level. Remove all excess spoil from the site.

Existing grassed areas shall be backfilled and turf re-laid on prepared bed or otherwisere-grassed to 10 above natural ground level.

In existing concrete or brick paved areas, backfill the trench with clean sand to theunderside of the reinstated pavement and consolidated by watering and mechanicalcompaction. Reinstate surfaces to the original level. For concrete surfaces useapproved reinforced steel, keyed to the existing to prevent the reinstalled concrete fromsubsiding and cracking.

In existing bitumen paved areas, camber the reinstated surfaces so that the edges areflush and the centre is 10 above the existing pavement. The top 150 (minimum)immediately below the bitumen, shall consist of finely crushed gravel mechanicallycompacted into the trench. Prime the existing bitumen edges of the trench shall be primecoated with bitumen prior to laying 75 minimum of hot "pre-mix" bitumen to the finishedcambered surface. If it can be shown that hot pre-mix is not available, cold pre-mix willbe accepted.

104.2 Underground Cable Protection

To preclude damage, cables installed in pipes shall be drawn using rollers, drumjacksand a cable stocking of the correct size.

A 150 wide orange marker tape bearing the words "WARNING - ELECTRIC CABLEBURIED BELOW" or similar and manufactured in accordance with AS 1648, Part 1, shall

be laid in the trench 150 below ground level for the entire length of all underground cableand conduit runs.

Marker tape is also to be provided over conduits and pipes installed underground forfuture use.

104.3 Underground Cable Draw-In Pits

Provide draw-in pits for underground cables as indicated. Where the size of the pit isindicated, the dimensions refer to inside dimensions. The pits walls and bottoms to beminimum 100 reinforced concrete. The concrete shall contain an approved additive toprevent ingress of water.

Alternatively proprietary type glass reinforced moulded cement pits or "Polycrete" withminimum 10 thick walls and bottom may be used and installed in accordance with the

manufacturer's instructions on a minimum 100 thick gravel aggregate bed which shallextend under the entire pit bottom. Encase the pit in a 100 thick reinforced concretesurround with the top neatly finished.

Drain all pits. The minimum drainage requirement is a 300 x 100 deep rubble draingraded away from the pit for a distance of 2000.

Pits greater than 400 wide shall be fitted with covers and frames of cast iron or aluminiumand concrete. The covers shall maintain a stabilising fit with the frame by a taper contacton the sides. All vertical mating surfaces to be fitted to a maximum clearance of 0.25mm.

Covers and frames shall be suitable for the particular loading conditions. Ensure, unlessshown otherwise, the loadings are low speed, heavy vehicle loads. The maximum mass

of any individual section of the cover shall not exceed 40 kg.Fit pits 400 wide and less with proprietary concrete covers.


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Install all pits with the top of the cover 25 above the surrounding finished level and gradethe surface for 500 around the pit.

Provide one set of lifting handles for the covers and store on site as directed.

Where the size of the pit is not indicated, minimum dimensions are 600 x 600 x 900deep.

The word "ELECTRIC" in 25 high letters shall be moulded into the lids of all such pitswhich contain electric power cables.

Pits used for the purpose of the telecommunications authoritys telephone services shallbear the marking Telecommunication as required by the ACMA standard.

Also see Clause 108.9 for draw-in box details.

105 MARKING PLATES FOR UNDERGROUND RETICULATION

105.1 Generally

Install marking plates on all underground cable or conduit runs. Manufacture plates fromminimum 1mm thick brass or other approved material 75 x 75 and fix with approvedwaterproof adhesive and four brass or stainless steel screws to suit the material of themarking plates. Use stainless steel plates and screws at sewage treatment works andsewage pumping stations.

Do not install marking plates on cable pit lids but may be installed on the concrete lip of acable pit.

Engrave marking with minimum 4 mm high lettering.

Install marking plates flush with the finished ground level. Recess or bevel markingplates in paved areas.

Prepare accurate record scale drawings of proposed marker locations and underground

reticulation prior to backfilling and will be retained by the Superintendent until markers areinstalled.

105.2 Indication of Cable Entry to Buildings

Where underground cables enter a building fix a marking plate to the wall at a height of300. Engrave the plate with an arrow pointing downwards and the words "ELECTRICCABLE".

In addition, fix a marking plate to concrete paving or the top face of a concrete blockapproximately 150 x 150 x 300 deep located immediately above the cable and as closeas practical to the building. Engrave the plate with an arrow, pointing in the direction inwhich the cable is laid, and the words "ELECTRIC CABLE". The distance to the nextmarker, in metres is required.

105.3 Indication of Directional Changes

Where an underground cable changes direction, fix two marking plates or alternatively aplate with two arrows to a concrete block approximately 200 x 200 x 300 deep locatedimmediately above the cable. Engrave each plate with an arrow pointing in the direction inwhich the cable is laid and the words "ELECTRIC CABLE". Neatly stamp the distance tothe next marker, in metres, into the face of the plate.


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105.4 Indication of Cables Under Roads and Paths

Where a cable passes under a road or path, place a marking plate at each side of theroad or path. Engrave the marking plate as detailed in Clause 105.3 and fixed to aconcrete block approximately 150 x 150 x 300 deep.

Alternatively, marking plates may be fixed to the kerb of a kerbed road.

105.5 Indication of Terminated Conduits

Where conduits are terminated underground and beyond the perimeter of a building orpaved area, fix a marking plate to a concrete block approximately 150 x 150 x 300 deeplocated above the termination point. Engrave the plate with the words "ELECTRICCONDUIT TERMINATED UNDER".

106 CABLES AND WIRING

106.1 Generally

Supply cables, terminations, fittings and accessories suitable for the voltage, current,frequency, temperature and environmental duty.

Terminate copper conductors either into tunnel type connectors or by suitably sized lugssweated or crimped in an approved manner.

Ross Courtney (solderless) terminations may be used on conductors up to 4mm2.

No joints in cables can be made between equipment terminal connections unlessrequired by AS 3000.

Stranded conductors are required above 1mm.

Cable colours and codes are as follows:

red, white, blue - active conductors in multi-phase mains and circuits.

red - active conductors in single phase mains and circuits.black - neutral conductor.white (numbered cores) - control circuit cabling outside of switchboards.green-yellow - earth wires.

Refer to Clause 205.2 for Cable Identification.

Carry insulation resistance testing out with a minimum 1000 V DC testing instrument.

Make final connections to equipment generally using flexible conduit, seal the flexibleconduit at each end using expanding foam or a cable gland.

All cables to be PVC insulated PVC sheathed circular unless otherwise specified.

106.2 Consumer's Mains and Metering

Run the consumer's mains underground from the Point of Attachment as sheathedcopper cable in conduit for its entire length to the main switchboard (in the case of currenttransformer metering) or the Supply Authority metering panel (in the case of DirectMetering).

The minimum size of consumers mains is 16mm, however the following requirementsapply:-

(a) Current carrying capacity to suit the maximum demand and any stated futureextensions with an excess current carrying capacity of 30% minimum.

(b) Be sized so the voltage drop is less than 1.5% at plant future maximum demand at

(a) above.

(c) Be either single core PVC/PVC cables or four core PVC/PVC cable XLPEinsulation may be used.


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(d) Comply with the requirements of the Supply Authority.

Where direct metering is employed the cable between the meter panel and the MainSwitchboard shall be the same size as the consumers mains and the voltage drop aboveshall include the voltage drop in this cable. Where required by the Supply Authority thecable shall be protected by a circuit breaker of the same type and frame size as the MainSwitchboard Main Switch.

Install a metering enclosure generally on an exterior wall of the building so that it isaccessible without entering the building. The panel shall generally be reused. Surfacemounting on existing buildings is acceptable. The metering enclosure and panel shall beEnergy Authority approved and suitable for the installation of the metering equipmentrequired by the Supply Authority.

All metering equipment shall be supplied and installed under this Contract including:-

(a) Plug-in meter bases (if required)

(b) Service fuses

(c) Current transformer metering equipment

(d) All necessary wiring

(e) Active link (if required)

(f) Neutral link

(g) Earth link

(h) Other equipment required by Supply Authority.

Paint meter boxes using acrylic gloss in a colour to match the surrounding building.

106.3 Final Sub-Circuit Wiring

106.3.1 Generally

The minimum size conductors shall be as follows:Power Circuits 2.5mm, copper conductorsLighting Circuits 1.5mm, copper conductorsClock Circuits 1.5mm, copper conductorsControl Circuits 1.5mm, copper conductorsCeiling Fan Circuits 1.5mm, copper conductors

Final sub-circuit wires shall generally be terminated in tunnel type connectors. Wherestud or pillar connections are made, stranded conductors shall be prevented fromspreading; twisting multi-stranded conductors is not considered adequate.

Connection of single strand conductors to tunnel terminals on moulded case circuitbreakers shall be made by doubling the conductor back in "open loop" form.

Wiring shall be carried out using the "draw-in, loop-in" system for both TP1 and TPScables. No intermediate connections to be made except for TPS cables where loopingterminals may be used at switches, light fittings etc.

Final connections to equipment having parts of the surface at a temperature greater thanthe temperature rating of the circuit cable shall be made with cable having insulation atleast rated to 200 degrees Celsius maximum operating temperature.

Supply all motors with a local rotary isolator connected in the control circuit adjacent tothe motor. Make final connections to all equipment using flexible conduit.

106.4 Instrumentation Cables

Instrumentation cables shall be cables that:


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i. Carry ELV analogue signals e.g. 4-20 mA dc.

ii. Connect to instruments for the purpose of signalling or monitoring.

iii. Connect to the inputs of PLC's or alarm annunciators.

Cables shall be min. 0.5mm PVC insulated aluminium polyester screened PVCsheathed.

A separate 2 core cable shall be supplied for each analogue signal (equal to DekronIEB183 type).

Digital signals may use a multi, twisted pair overall screened PVC cable. Each digitalsignal shall have its own pair as, common returns are not permitted. Cable shall beequal to Dekron IEC183 type.

The screen of each cable shall be earthed at the switchboard only.

106.5 Insulated Non-Armoured Cables in Enclosures (TPI)

Cables shall be 0.6/1 kV grade with minimum V75 or XLPE insulation.

106.6 Underground Grade Insulated and Sheathed Non-Armoured Cables (TPS)Cables shall be 0.6/1 kV grade with minimum V75 or XLPE insulation.

The cables shall have the manufacturer's name and reference and the word"UNDERGROUND" clearly indented in the sheathing.

106.7 Armoured and Sheathed Cables (Other than Paper Insulated)

Cables shall be 0.6/1 kV grade with minimum V75 or XLPE insulation and shall havearmouring of galvanised steel wire (double or single), steel tapes, or aluminium strip/wire.

Tape armouring shall not be used to support the cables during installation.

Armouring shall be cleaned, clamped and connected to earth at the origin of the cable. Itshall not be used as an earth conductor.

106.8 Aerial Cables

Cables shall comply with AS 1746 "Hard-Drawn Copper conductors for Overhead PowerTransmission Purposes" or AS 3607 "Bare Overhead Aluminium Conductors SteelReinforced", or AS 1531 "Aluminium Conductors for Overhead Power TransmissionPurposes".

Aerial cables attached to buildings shall be insulated. Connections between aluminiumable and copper aerial cable shall be made with a bail clamp having aluminium andtinned copper connectors.

Where aluminium cables are terminated to copper cables the aluminium cable shall bephysically above the copper cable.

106.9 Special Purpose

106.9.1 Essential Service Cables

Unless other indicated, cables supplying power to designated "Essential Services" shallconsist of MIMS copper conductor copper sheath cables.

Where run horizontally, the cable shall be as high as possible, separately fixed directly tothe building structure (eg underside of slab). Where run vertically, the cables shall bemechanically protected. Where a number of services cross or follow a similar route the"Essential Services" cable shall be located at the highest point and closest to thestructural support.

Metal cable fixings shall be used; the use of nylon or plastic material is prohibited.

106.9.2 Telephone Cables


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Cables used for communication purposes (Telephone, Intercom etc) shall be multi-pairtelephone cables of nominal conductor diameter 0.5mm minimum to ACMA Specification.Cables installed within buildings shall be PVC insulated and sheathed. Cables installedexternal to a building shall be Polythene insulated and sheathed.

All work associated with telephone line connections shall comply with the following:

Australian Regulatory Arrangement Handbook HB 243-2007 (CommunicationCabling Manual Module 1)

Communication Cabling Handbook HB29-2007 (Communication Cabling Module2)

Requirements for Customer Cabling Products (AS/ ACIF S008-2006)

Installation Requirements for Customer Cabling (AS/ACIF S009-2006)

106.9.3 Fire Alarm Cables

Cables used for the connection of thermal, smoke and manual fire detectors, or otherassociated equipment within the building shall be TPI or TPS minimum 1.5mm2 strandedcopper cable. TPS cable shall have red coloured sheathing.

106.9.4 Security Cables

Cables used for window and door seals, and associated equipment shall be minimum0.5mm stranded copper TPI cable, figure 8 configuration.

Cables for space detectors (ultrasonic, infra-red, microwave, etc) shall be minimum0.5mm stranded copper TPI, shielded twisted pairs or as per the manufacturer'sinstallation requirements.

106.10 Control Cabling

(a) General

The insulation of each cores shall indelibly be numbered consecutively (e.g. one 1) foreach core.

(b)240 Volt a.c. Control Cabling

Control cables shall be PVC insulated PVC Sheathed cables with copper conductorminimum 1.5mm.

(c)ELV Control Cabling for Connection to Digital I/O

ELV control cables external to the switchboard connecting to digital I/O shall be V-90HTPVC insulated with overall screen and drain wire of minimum size 0.5 mm.

(d)ELV Control Cabling for Connection to Analogue I/O

ELV control cables external to the switchboard connecting to analogue I/O shall beoverall screened, PVC sheathed twisted pair cabling with a minimum conductor size of1.5 mm.

107 EARTHING

107.1 Generally

The earthing system shall comply with the Statutory and/or Supply Authorityrequirements.

Generally earthwires shall be enclosed in conduits with submains and subcircuits.

A separate MEN system for each building shall be used except where an earthingconductor is indicated to be run with the submain to that building.


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Metallic pipes used for other services, such as gas, water, sprinkler systems, etc., shallbe considered as unavoidably in contact with metallic enclosures of electrical equipmentand shall be effectively bonded to the earthing system.

107.2 Earthing Conductors for Underground Cables

Earthing conductors other than the copper sheathing of MIMS cables shall be copperstranded conductors sized as per AS 3000, protected by a green-yellow insulation andinstalled as follows:

(a) Separate earthing conductors for TPI conductors in conduit.

(c) Separate earthing conductors attached to the cable at 1000 intervals.

(c) Earthing conductors laid up with the cable.

107.3 Earth Electrodes

Earth electrodes shall consist of copper, stainless steel or copper sheathed rods not lessthan 16 diameter driven to a depth of not less than 2400 to reach the permanent moisturelevel. Unless disallowed by the Supply Authority, the indicated footing in each building

shall be used as an electrode in addition to the above. The earthing conductor shall beconnected to the reinforcing steel of the indicated footing and the driven electrode. Eachelectrode shall generally be installed in an earthing pit similar to "Polycrete" PEP 22.Each pit shall have a reinforced concrete surround minimum 250 wide and 200 deepcomplete with cable markers.

108 CONDUITS, FITTINGS AND JOINTS

108.1 Generally

Conduits and fittings shall comply with either AS 2052 "Metallic conduits and fittings" orAS 2053 "Non Metallic conduits and fittings". Conduits smaller than 20 dia. shall not be

used except for fire alarm systems where 16 dia. will be accepted.

Conduits shall be in long lengths, straight, smooth and free from rags, burrs and sharpedges. Off cuts shall not be used to fabricate long lengths of conduit. Conduits shall beset wherever possible to minimise the number of joints.

Bends shall be of large radius and shall be formed with approved formers. Correctlysized springs shall be used to form bends in UPVC conduits. Conduits manipulated orbent must maintain true effective diameter and shape at all parts of the bend. Conduitsets distorted or showing evidence of kinks, wrinkles, flats or having been heated will notbe accepted. Wherever possible, UPVC Conduits bends should be preformed by themanufacturer.

Conduits shall be colour coded in accordance with Clause 602 of MEW E101.

Saddles supporting conduits shall be effectively secured to the surface on which they run.Saddles shall be a proprietary brand installed as supplied.

Conduit systems, including conduits and pipes used to convey cables into buildings, shallbe sealed to prevent water entry.

The number of cables including earth wires that may be enclosed in any one conduit orpipe shall not exceed that recommended as a guide in AS 3000.

All conduits exposed to weather shall be painted with a light coloured paint designed forthe purpose.

108.2 Heavy Duty UPVC Conduits to AS 2053 (HD-UPVC)

This conduit shall be coloured "light orange" except for conduits enclosing

telecommunication authority cables which shall be "white", and may be usedunderground, above ground is permitted only as specified. All fittings shall be of thesame material as the conduit and all joints shall be made with an approved adhesive


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cement of contrasting colour. These conduits are not generally permitted above groundexcept to sizes above 63 when the conduit must be painted with a light coloured acrylicgloss paint designed for the purpose.

108.3 Steel Conduits

All steel conduits shall be heavy protected (hot dipped galvanised), with screw joints andscrewed terminations, to AS 2052. End joints and terminations shall be made byscrewing the conduit into the fitting with circular galvanised plated lock nuts screwed ontothe conduit.

Steel conduits shall have screwed ends and screwed joints, all threads being painted withaluminium paint. Steel conduits shall be electrically and mechanically continuous.Electrical continuity tests shall be carried out prior to the installation of draw cords.

108.4 Light Duty UPVC Conduits to AS 2053 (LD-UPVC)

This conduit may only be used above ground in positions not exposed to mechanicaldamage.

All associated plastic fittings shall be of the same material as for the conduits.

All conduits, plastic fittings and adhesive cement shall be procured from the samemanufacturer, and the manufacturer's recommended procedures shall be adopted for themaking of joints. All joints and conduit entries shall be made with an approved adhesivecement of a contrasting colour.

All wall and junction boxes shall be of the same material as the conduits. Where specialsize boxes are indicated but are not obtainable in PVC, pre-fabricated metal boxes shallbe used where approved. UPVC conduits shall be fixed to such metal boxes withscrewed PVC adaptors and lock nuts. metal boxes shall be earthed.

UPVC conduit shall be fixed to a PVC wall box with a screwed PVC adaptor and circularlock nuts, unless the conduit enters the wall box via a moulded conduit entry.

108.5 Flexible ConduitsFlexible conduits shall be of the plastic sheath, smooth, PVC spiral reinforced type andshall be oil resistant, UV resistant and impact resistant.

Flexible conduits shall be equivalent to:

i. FLEXICON LPC

ii. RHINOFLEX by ADAPTAFLEX

Where the connection is the final connection to an electrical item, the conduit length shallbe sufficient to allow decoupling and moving aside of the equipment withoutdisconnection of the cables or conduit. The degree of protection of fittings associated withthe conduit shall be IP67. All fittings shall be nickel plated brass except where otherwiseindicated. Notwithstanding the previous sentence, the fittings shall be compatible withchemicals in the area of installation.

Corrugated flexible conduits are not permitted.

Carry out all final connections to equipment using flexible conduit.

Fix flexible conduits to a surface with saddles or stainless steel bands. Do not use PVCcable ties for the fixing of flexible conduits.

108.6 Installation

108.6.1 Generally

Generally, UPVC conduit shall not be installed on exterior surfaces. However, sunlight

resistant UPVC conduit and fittings complying with AS 2053 and marked with the letter"T" may be run in locations exposed to direct sunlight. In sewage treatment works allexternal conduits below 40mm shall be "Clipsal HFT". Also, short runs of HD-UPVC


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pipes from underground submains may be surface run where they enter a building if it isnot practicable to conceal them, provided that they are suitably protected frommechanical damage and sunlight.

All UPVC conduits shall be terminated into metal boxes and enclosures (draw-in-boxes,joint boxes, switchboards, ducting etc.) via a screwed PVC adaptor with lock nut.

Conduits shall be so installed that wiring is carried out using the "draw-in, loop-in" system.The conduit run shall be completely installed before wiring is drawn in.

The wiring shall be drawn in only at outlets and switchboards and, if approved, at draw-inboxes. Inspection fittings are allowed only if approved.

Conduits shall be run directly from the entry point to the termination point with theminimum number of sets (the number of sets shall not be greater than the equivalent of 3x 90 degree bends). The installation of elbows, tees, etc., is prohibited on conduitsinstalled in inaccessible locations.

All conduits shall be effectively capped during construction.

Conduits shall be securely fixed to building members and shall be adequately supportedduring all stages of building construction. (Particular care shall be taken to support PVCconduit upstands). Generally all conduits shall be concealed and only exposed to viewwhen approved.

Surface conduits shall be made to harmonise as far as practicable with the architecturalfeatures of the building. Surface conduits shall be run in vertical and horizontal directionsexcept where it is desirable to follow the line of a building, where the approval of theSuperintendent shall be obtained.

Conduits shall terminate in luminaires, equipment, accessories or in wall boxes andjunction boxes of a type compatible with the installation.

Do not exceed the following space factors:-

1 cable in the conduit - 50% of the area

2 cables in the conduit - 30% of the area

3 or more cables in conduit - 40% of the area

108.6.2 Conduit Saddles

Conduit saddles shall be either PVC or stainless steel. PVC saddles may be usedindoors and in wet wells or areas not exposed to sunlight. All other situations shall bestainless steel saddles.

108.6.3 Expansion Joints

Expansion fittings shall be installed on all straight runs of UPVC plastic conduit, exceptthose embedded in concrete or wall chases. The spacing of expansion fittings shall not

be greater than 8000. A sample of the type of expansion fitting to be used shall besubmitted prior to installation. Conduit clips shall be installed close to expansion fittings;all clips shall be installed to allow the conduit to move freely while expanding orcontracting.

Expansion couplings shall be installed wherever expansion or contraction joints occur in abuilding slab. Note: "Bellows" type expansion couplings shall not be used in floor slabs orsimilar installations.

Each expansion coupling in a building slab shall consist of a short length of flexibleconduit, to join the two UPVC conduits across the expansion joint, covered by a largerUPVC conduit. The larger conduit shall extend 150 from the flexible conduit in bothdirections and shall be secured fixed to prevent movement and sealed to preventconcrete entry whilst the slab is poured.

For multi-pipe expansion boxes refer to contract drawings for details.

108.7 Conduits in Roof Spaces


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Where conduits are run in roof spaces, they shall be installed below the heat insulationand sarking but above any insulation on the ceiling.

Where PVC conduits are installed in roof spaces and are likely to be walked on, theyshall be adequately protected.


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108.8 Conduits in Concrete

108.8.1 Generally

Unless otherwise indicated, conduits shall not be run in the concrete topping. Conduitsrun in the fill under floor slabs shall be HD-UPVC.

Corrugated conduits are not permitted.

Conduits shall be securely fixed to the reinforcing rods, passing above a single layer ofrods or between a double layer of rods, generally mid-way in the thickness of the slab.Attention shall be paid to routes of conduits in slabs to avoid cross-over and to keep thenumber of conduits in any one location to a minimum. Conduits in slabs shall be spacednot less than 75 apart.

Conduits may cross providing they intersect at angles greater than 30 degrees and aretied together. The minimum cover over conduits shall not be less than the conduitdiameter or 20.

Conduits shall not be installed in a slab through the areas around a column to one quarterthe distance from the column to the next column, supporting beam or wall, except to

outlets in the area.Attendance during the concrete pouring to ensure that conduits are not displaced, brokenor damaged is mandatory.

Two working days notice shall be given to the Superintendent's Representative to inspectall conduits prior to pouring concrete. Sufficient time for alterations or modificationsfound necessary during inspection by the Superintendent's Representative shall beallowed.

108.8.2 Conduits in Suspended Slabs

Unless otherwise indicated, the maximum diameter of conduits in suspended slabs shallbe 25, spaced not less than 75 apart.

108.8.3 Conduits in General Columns

Unless otherwise indicated, a maximum of four 20 dia. conduits are permitted in eachcolumn. No more than two conduits shall cross any one face of the column and allconduits shall be placed centrally.

Bends in conduits entering the columns shall have a minimum radius of 300. Structuralcolumns shall not be chased for conduit installation.

108.9 Draw-In Points

For surface run conduit systems, draw-in points shall be provided at suitable intervals notexceeding 30 metres for straight runs and at intervals not exceeding 25 metres for runsincluding directional changes. Draw-in points shall be agreed with the Superintendent

prior to installation. Where used, draw-in boxes shall be of adequate size to preventundue deformation of the cables.

For underground conduit systems, draw-in boxes are not permitted. Provide pit atmaximum 50 metre intervals.

Materials used to lubricate cables whilst drawing-in to conduits shall be non-conductive,non-abrasive and non-hygroscopic.

108.10 Conduits and Pipes for Future Use

All conduits and pipes for future use shall be provided with polypropylene draw cords. Alength of cord 2000 long shall be left securely fixed at the ends of each run. Conduitsand pipes shall be labelled in accordance with Clause 603.

Conduits and pipes terminated outside a building shall be taken beyond the line ofpaving, the draw cord shall be secured and the conduit or pipe capped, waterproofed andthe location marked in accordance with Clause 105.5.


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108.11 Wall Boxes

Wall boxes installed in face brickwork shall be located so that the centre line of the boxcoincides with the horizontal centre line of the row of bricks nearest to the specifiedheight for the box. In hazardous areas or areas defined as hazardous, the box shall belocated at a height not less than the minimum height stipulated in the Wiring Rules.

Wall boxes shall be securely fixed. The front edge shall be no more than 10 behind wallfinish. Wall boxes installed in face brickwork having raked joints, or in shiplap timberwork, shall be set with the face of the box flush with the surface of the work.

Deep pattern wall boxes shall be used where conduits are run within brickwork, e.g. whenbricks are "biscuited".

Wall boxes must not be installed across the junction between different wall finishes.

Metal wall boxes must be earthed.

Wall boxes having sliding type lugs for attaching flush plates will not be accepted.

Plastic wall boxes shall have threaded brass inserts for securing flush plates.

109 CONDUIT SYSTEMS FOR COMMUNICATION SERVICES

Conduit systems shall be mechanically continuous.

Conduits shall be of the same type used in the rest of the installation and shall complywith the relevant clauses of this specification. Systems shall comply with the relevantconduit requirements of Clause 108 and the following requirements as applicable.

109.1 Conduits for Telecommunication Facility Cabling

Conduits shall be 20 dia. Where run parallel to conduits capable of enclosing powercables, a minimum spacing of 150 shall be observed.

Conduits in any one installation shall originate at an approved box or cupboard, sized andlocated as indicated for use as a distribution frame.

Each conduit shall terminate at a floor-mounted box or a flush wall box with coverplate asindicated.

Not more than three outlets shall be served by one 20 dia. conduit, looping from outlet tooutlet without the use of tees or elbows. Draw boxes within a building shall be installedso that cables do not need to be pulled in for a distance exceeding 12 metres.

Draw cords shall be installed in each conduit in accordance with Clause 108.10.

Before installation, approval shall be obtained from the local Telecommunication AuthorityOffice.

109.2 Conduits for Telecommunication Lead-In and Block CablingLead-in conduits shall originate and terminate at locations as indicated.

Block cabling conduits shall originate and terminate at cupboards or approved wall boxes,sized and located as indicated for use as distribution frames. Underground conduits shallbe heavy duty UPVC type, coloured white, and shall be spaced from other services to theapproval of Telecom. For details on separation from, and crossing of power cables seerelevant ACMA Specification.

Conduits shall be sized as indicated.

Draw cords shall be installed in each conduit in accordance with Clause 108.10.

Before installation, approval shall be obtained from the local Telecommunication AuthorityOffice.


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110 CABLE TRAY, LADDER AND TROUGHING

110.1 Generally

Cable tray, cable ladder and all accessories shall be proprietary items from a singlemanufacturer whose range includes splice connections, expansion splices, covers, risers,

crossovers, reducers, bends and all other accessories used. Supply coversmanufactured from the same material as the tray or ladder up to 2000 above finishedfloor level.

110.2 Cable Tray

Cable tray shall be manufactured from steel, hot dip galvanised after fabrication or fromaluminium or stainless steel.

Minimum thickness for cable tray shall be:

1mm up to 150 wide 1.6 for aluminium1.2 mm from 150 up to 300 wide 2 for aluminium1.6 mm above 300 wide 2.6 for aluminium

All cable trays shall be slotted similar to "Admiralty" pattern and shall have folded or rollededges. The "standard" tray shall be formed with the perforations punched from outsidethe folded edge to avoid any sharp edges or burrs existing on the outside face. The"reverse" tray shall be perforated from the inside and shall be used in positions wherecables are laid horizontally in the tray or alternatively, trays shall have the metalreinforced by folding to provide equivalent stiffness.

Cable trays installed externally must be aluminium or stainless steel.

110.3 Cable Ladder

Cable ladder shall consist of two folded steel or extruded structural grade aluminium siderails with cable support rungs between the two rails. The rungs shall be either welded orfitted to the side rails.

Unless otherwise indicated rung spacing shall not exceed 300. Cables smaller than 13OD installed on cable ladder shall be run on perforated tray or ducts installed on theladder. This requirement does not apply where the rungs of the ladder form a continuousbase.

110.4 Installation

Cable tray and ladder shall be installed by either:

(a) surface fixing to ceilings or walls; or

(b) suspending by hangers from ceilings, or by angle brackets out from walls.

Fixings, hangers and angle brackets are to be spaced at a maximum distance of 1000.

Joints shall be adequately supported.Where possible, cable tray and ladder shall not be mounted less than 2300 above floorlevel. Adequate access shall be provided to cable tray and ladder. Where supported byhangers or angle brackets, a minimum distance of 150 shall be allowed above and 600on one side of the tray or ladder.

Alternative systems and supports with greater spacing may be accepted if they give equalrigidity and strength.

Where cable tray or ladder span open areas they shall be capable of supporting anadditional load of 70kg at mid span without permanent deformation.

Cables or groups of cables shall be securely strapped to the tray or ladder usingproprietary nylon cable ties or straps: for vertical runs at 1000 maximum; for horizontal

runs at 2000 maximum.Cables shall leave the cable tray or ladder in such a manner that no cable shall be incontact with the side rails. In general, cable shall leave the tray or ladder in conduit,


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which shall be securely anchored to the tray or ladder and with the conduit end fitted witha screwed cable gland to suit the cable.

110.5 Cable Troughing

110.5.1 Generally

Cable troughing, covers and fittings shall be of proprietary manufacture. Troughing shallhave screw fixed covers, unless installed in a location not readily accessible, where clip-on lids may be used. All fixing methods shall provide a smooth internal surface for thecables, for example, domed headed gutter bolts for joining sections, with the smoothhead surface on the inside and nuts on the outside. Self tapping screws are prohibited.

Troughing shall be installed with the cover fixing screws accessible and the covers shallbe easily removable. The troughing shall be adequately supported in accordance withthe Wiring Rules and, where they span open areas, they shall be capable of supportingan additional load of 70 kg at mid span without permanently deforming.

Retaining clips shall be installed to retain the wiring at intervals not exceeding 1000 in alllocations except where cable troughing is run horizontally with covers uppermost.

Where troughing is connected to weatherproof or hoseproof (i.e. IP43 through to IP56)enclosures, the entry shall be made in such a manner as to prevent moisture entering theenclosure.

Only PVC/PVC cables are permitted in troughing.

110.5.2 Metal Cable Troughing

Metal troughing shall be of an approved design and construction with removable coversfixed by suitably plated bolts and captive nuts. The troughing and covers shall be ofgalvanised sheet steel or aluminium of minimum 0.8 thickness and shall be free fromrags, burrs and sharp edges.

110.5.3 Plastic Cable Troughing

Plastic troughing shall be of UPVC. The troughing and covers shall be robustlyconstructed from heavy gauge material to avoid sagging between supports and to avoidwarping. All associated fittings shall be of similar material to the troughings.

110.5.4 Skirting Troughing

Skirting troughing shall be of proprietary manufacture and shall have three channels.Where used to extend an existing installation, the skirting troughings shall match thatinstallation. Skirting troughing used for Telecommunication Authority telephone cablesshall comply with the relevant ACMA Specifications.

111 FIXINGS

111.1 Generally

The following minimum requirements shall be observed.

Fixings shall be secure and adequately sized to suit the weight, size, shape and locationof the equipment being fixed.

Fixings used in external or damp locations, or sewage treatment plants and pumpingstations including exterior luminaires, shall be 316 grade stainless steel. All other fixingsshall be hot dipped galvanised.

Fixings shall be made to adequate firm supports and not to asbestos cement orhardboard sheeting, etc.

Holes for screws shall have the correct clearances.


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Holes drilled for masonry anchors shall be 6 mm deeper than the plug or anchor andcorrectly sized to the manufacturer's recommendations. Pilot holes for timber fixing shallnot be larger than the screw root diameter.

Plastic or fibre plugs shall not be used.

111.2 Conduits

Conduits 20, 25 and 32 dia. shall be fixed as follows:

(a) To masonry, concrete, cement rendered walls: 6 expanding sleeve masonryanchor to accommodate an M4.5 thread. However for 20 and 25 conduits indoorsnylon anchors with mushroom stainless steel expansion nail may be used.

(b) To timber: where directed fixed, wood screw No. 8 x 20, round head. Where fixedthrough fibrous cement, plaster, plaster board, etc., the screws shall be ofsufficient length to allow for the additional thickness.

(c) To sheet metal: No. 8 x 13 long, galvanised binding head, self tapping screws.

(d) To steel: M5 round head screws of appropriate length tapped or bolted.

Conduits 40, 50, 63, 65, 80 and 100 dia. shall be fixed as follows:(a) To masonry, concrete, cement rendered walls: 8 expanding sleeve masonry

anchor to accommodate an M8 thread.

(b) To timber: where directly fixed, steel wood screw No. 12 x 35, round head. Wherefixed through asbestos cement, plaster board, etc, the screws shall be of sufficientlength to allow for the additional thickness.

(c) To sheet metal: No. 12 x 13 long, galvanised binding head, self tapping screws.

(d) To steel: M6 round head screws of appropriate length tapped or bolted.

111.3 Mounting Blocks

Mounting blocks shall be fixed with four screws as specified for conduits 20, 25 and 32

mm diameter.

111.4 Switchboards

The fixing of switchboards shall be as described in Clause 112.2.

111.5 Switch Panels, Boxes

Switch panels and boxes shall be fixed with four screws in accordance with 112.2.Fixings shall be one of the following, to suit the surface:

(a) Steel wood screw, No. 8, round head, or

(b) No. 8 electro-galvanised, binding head, self tapping, or

(c) M5, round head.

(d) M8 masonry anchor.

111.6 Surface Mounted Switches

Fixings shall be as indicated in Clause 112.5.

Single gang switches shall be fixed with two screws and double gang and larger with fourscrews.

111.7 Cable Troughing, Cable Tray, Skirting Troughing

Cable troughings, trays and skirting troughing wider than 100 shall be fixed at intervals ofnot more than 1000 with two screws per fixing. Screws shall be steel wood screws, No.

12, round head, cadmium plated or cadmium plated M6 round head screws or No. 12electro-galvanised, binding head, self tapping screws.


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111.8 Metal Channel

Metal channels shall be suspended using galvanised suspension rods with proprietaryfittings.

Where secured directly to timber, metal channels shall be fixed with M10 x 50,hexagonal head, coach screws.

111.9 Hollow Block Locations

Fixing to hollow sections shall be avoided. Where approved, it shall be by means of M5electro-galvanised, round head screws and spring loaded butterfly toggles. This fixingdoes not apply to ceiling fans.

111.10 Fixing of Luminaires

The fixing of luminaires shall be as indicated in Clause 403.

111.11 Fixing of Ceiling Fans

The fixing of ceiling fans shall be 2 off M6.

112 INSTALLATION OF SWITCHBOARDS

112.1 Generally

Where a switchboard has been split for installation, it shall be reassembled on site by theswitchboard manufacturer. Particular attention shall be given to busbar joints which shallbe torque tightened to the manufacturer's recommended torque and shall be insulated orcoated in accordance with Clause 204.6

If a switchboard is stored or installed in any area where building work is incomplete, itshall be adequately protected against moisture, corrosion, dust, paint, and mechanicaldamage.

112.2 Fixings

Floor mounted switchboards shall be fixed to the floor or other structure with M12 hotdipped galvanised bolts through the mounting holes provided in the base. Alternatively, aminimum of four hot dipped galvanised clamps may be used, each secured with an M12hot dipped galvanised bolt.

Wall mounted switchboards shall be installed using an adequate number of fixings.However, not less than four fixings per switchboard shall be used. Fixings shall be:

(a) To timber:

(i) Proprietary Assemblies - hot dipped galvanised steel No. 12 wood screws of

suitable length(ii) Custom-built Assemblies - 10 diameter coach screws of suitable length with

a full washer under the head.

(b) To masonry and concrete:

(i) Proprietary Assemblies - stainless steel 6 diameter expanding sleevemasonry anchors of the projecting stud type each fitted with a full washerand nut.

(ii) Custom-built Assemblies - stainless steel 10 diameter expanding sleevemasonry anchors of the projecting stud type each fitted with a full washerand nut.

112.3 Cables, Cable Enclosure and Busway Entry and Termination


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Where switchboards are fitted with cable-entry plates, one or more plates shall be neatlyadapted to accept the incoming cable(s). Only the minimum number of plates shall beused thereby leaving spare cable entry plates for future cable entries.

Cables entering a switchboard or control panel shall be glanded using non-ferrousmetallic or plastic glands with neoprene compression seals conduit with suitable adaptorand locknut may be used where circuit is enclosed in conduit for its entire length. Cableentry shall only be through the detachable gland plate supplied with the switchboard.

Where the sheath of a multicore cable enters either a switchboard or an electricalequipment enclosure, the sheath shall be:

(i) Continued unstripped up to within less than 350 of either its lug terminations if apower cable or its connecting terminal block if a control cable.

(ii) Continued unstripped after either the related conduit entry or the related cablegland by at least 100 to allow for cable identification marking.

(iii) Identification marked as indicated within 100 of the end of the sheath.

Where multicore cables with numbered cores are installed, the same numbers shall becontinued from the switchboard to the final connections. This may require stripping of the

outer sheath and continuation of the cores. This may also require the use of extra earthcables where more than one final connection is made.

The unused cores of a multicore cable shall be terminated in the terminals provided in aswitchboard and in an insulated screwed connector in the field. The length of the unusedcores shall be at least as long as the longest used cores. The unused cores shall belooped and tied so as to be easily accessible.

Terminations of multicore cables shall be such as to minimise the length of theunsheathed cores, but sufficient core length in the form of a neat loop shall be left toensure that no termination is under tension and to allow for connectors to be relocated.

Cores with the same insulation colours or numbers shall not be run together.

There shall be no more than one conductor per terminal and all field cables shall enter

switchboards via terminals (except instrument cables where indicated).

Cables enclosures shall continue to the switchboard, but each cable shall be separatelyglanded at the gland plate.

Cable and cable cores shall be identified in accordance with Clause 205 of thisdocument.

Where more than five separate surface run cables or cable enclosures are to enter aswitchboard through the top or bottom, enclose all this wiring within U-shaped metalcovers or ducts run from ceiling or floor to within 150 of the switchboard. Gland all cableswhen they enter the switchboard. Covers shall be earthed to switchboard cubicle, fixed towalls generally in accordance with Clause 112, painted to match switchboard and shallmaintain the switchboard IP rating. The metal cover or duct shall have minimum 50%

spare capacity for future wiring.Cables shall not enter through the top of externally mounted switchboards.

To minimise eddy current effects, where single core cables rated over 300 A passseparately through a steel cable entry plate, the entry holes shall be joined with slots andthe slots brazed or epoxy filled. In addition, metal cable saddles shall not be fitted overthese cables.

All mains and submains shall be supported or tied within 200 of the terminations. Thissupport or tie shall be substantial due to the stresses under short circuit conditions.

Where a busway is brought into a switchboard, the insulated cable entry plate shall havea close tolerance cut-out to fit the busbars. The busway enclosure shall be flanged at theswitchboard and shall be bolted and sealed to the switchboard enclosure. The busway

enclosure shall be earthed to the switchboard cubicle. Busbar clearances entering theswitchboard shall comply with Clause 204.8.


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Terminations of mains and submains shall be fully insulated or coated in accordance withClause 204.6.

112.4 Schedules and Drawings

Neat and legible schedules and drawings as described below shall be installed in insect-proof mounting frames having clear plastic covers and located on or adjacent to therelevant switchboard but away from direct sunlight.

Schedules and drawings required are:

(a) For each distribution board a type-written circuit schedule.

(b) For each switchboard a copy of the relevant "as installed" lighting and power layoutfloor plans.

(c) For each site a copy of the "as installed" drawing showing all main site reticulationincluding details and accurate positions of all spare conduits.

(d) Drawings shall be minimum A3 size photocopies.

113 WORK AS EXECUTED DRAWINGS

Progressively produce Work As Executed Drawings and secure accuracy of detail for allwork covered by this contact.

Number Work As Executed Drawings with the suffix X. Provide a dated notation onWork As Executed Drawings indicating all changes that were made as modifications toexhibited drawings.

All abbreviations shall be in accordance with AS 1000.

Drawings shall conform to AS 1100 Drawing Practice, SAA HB7-1993-1989 EngineeringDrawing Handbook, AS 1102 Graphical Symbols for Electrotechnology and AS 1103Diagrams, Charts and Tables for Electro-technology and AS3702-1989. Printing shall be

minimum 2.5 high.

113.1 Drawings Produced by Modification of Exhibited Drawings

(Exhibited drawings are defined to be drawings which are part of the originaldocumentation.)

Drawings which are produced by modification of exhibited drawings shall be based on aclean print of the exhibited drawing which shall contain modifications and additions neatlymarked up in red pen. At the completion of the commissioning, these marked updrawings shall be signed by the contractor. Five copies of these drawings shall besupplied.

113.2 New Drawings Submitted by the Contractor

Where new drawings are required to be produced as part of this contract to supplementthe modified exhibited drawings, produce the drawings using the latest versions ofComputer Aided Drafting software and print the drawings using a laser quality printer ofminimum resolution 1200 x 1200 dots per inch. Use minimum 80 grams per squaremetre paper. Five prints of these drawings shall be supplied.

114 ACCREDITATION FOR CONTESTABLE WORKS

Where the NSW Office of Fair Trading of the NSW Department of Commerce requiresthe accreditation of Service Providers for such works as are deemed contestable, suchaccreditation shall be required to carry out the works as follows:

114.1 Level 1 AccreditationWork on the electricity distributors distribution system (ie construction work relating todistribution network assets).


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114.2 Level 2 Accreditation

Work associated with service lines between the distribution system and the point ofsupply to the premises, energising and metering services. (i.e. construction and/orinstallation of the service line interface between the distribution system and consumerterminals, including metering services).

114.3 Level 3 Accreditation

Design work associated with Levels 1 and 2 above. (i.e. design of transmission anddistribution works for categories overhead and underground).


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MEW E101 Page 27

PART 2 - SWITCHBOARDS AND ASSOCIATED EQUIPMENT

201 SCOPE

The section covers the design, manufacture and testing of extra low voltage and lowvoltage switchboards and associated equipment.

202 GENERALLY

All Custom-built Assemblies for one contract shall be manufactured by the onemanufacturer with all equipment sourced from the same suppliers for all switchboards.

All equipment shall be positioned so as to provide safe and easy access for operationand maintenance. All switchboards shall be totally enclosed and shall comply with therequirements of AS 1939 with a minimum degree of protection as indicated in therelevant section herein or as indicated in the Specification.

Switchboards shall be designed and manufactured such that they may be readily movedto, and installed at the indicated locations.

If a switchboard is split for installation, all materials necessary for reassembly shall beprovided.

In addition to complying with the Specification, all switchboards shall comply with thespecial requirements of the relevant Supply Authority.

202.1 Classification of Switchboards

Switchboards are classified as Custom-built Assembly Type CT, Custom-builtAssembly Type CU, Custom-built Assembly Type DT, Custom-built Assembly TypeDU, Custom-built Assembly Type DUPLUS, Custom-built Assembly Type DTPLUSor Proprietary Assembly.

A Proprietary Assemblies is defined as a low or extra low voltage switchgear andcontrolgear assembly available as a catalogue item, which consist of the manufacturersstandard layouts and equipment.

A Custom-built Assemblies is defined as a low or extra low voltage switchgear andcontrolgear assembly manufactured to order.

202.1.1 Proprietary Assemblies

The following details shall apply to Proprietary Assemblies:

(a) They shall be front connected, surface mounted with minimum protection IP 30.

(b) Enclosures shall be metallic.

(c) Circuit Breakers or switches mounted in enclosures shall have the circuitbreaker/switch toggle protruding through a metallic escutcheon.

(d) Space shall be provided within a proprietary assembly containing circuitbreakers/switches for a minimum of 20% spare poles or 4 spare poles, whicheveris the greater.

(e) Lifting handles or substantial knobs shall be provided for front covers andescutcheons.

(f) All edges of all covers shall rest on the cubicle body or on a mullion. Interlockedcovers are not acceptable.


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202.1.2 Custom-built Assembly Type CT

The following details shall apply to Custom-built Assemblies Type CT:

(a) A Type CT assembly shall be a stationary cubicle-type assembly as defined inAS/NZS 3439.1:2002.

(b) A Type CT assembly shall comply with AS/NZS 3439.1:2002 as defined by thefollowing requirements:

(i) Form of separation shall be Form 1.

(ii) The degree of protection after installation in accordance with themanufacturers instructions shall be IP51 for indoor installation and IP56 foroutdoor installation.

(iii) Assemblies shall be front access with top and/or bottom cable entry.

(iv) Assemblies shall be floor mounted or wall mounted. Wall mounting isacceptable only if the frontal area of the assembly has an area less than 2square metres.

(v) For outdoor switchboards containing busbars, pollution degree 3 shall apply

at locations further than 1km in a direct line from the coast or at altitudesbelow 1000 metres. Otherwise, pollution degree 4 shall apply.

For indoor switchboards, pollution degree 3 shall apply.

(vi) The following safety measures against direct contact shall apply:

Requirement of a key or tool to gain entry into the switchboard. (Meetclause 7.4.2.2.3 a) of AS/NZS 3439.1:2002.)

Shielding all live parts in such a manner that they cannot beunintentionally touched when the door is opened or the cover is removed.(Meet clause 7.4.2.2.3 c) of AS/NZS 3439.1:2002.)

(vii) Assemblies shall be Partially Type Tested Assemblies or Type Tested

Assemblies with type test certificates or satisfactory test reports for the typetests listed in clause 8 of AS/NZS 3439.1:2002. Documentation shall beavailable to demonstrate that the results of type tests were satisfactory. Thetesting facility shall be accredited by NATA or registered with the Associationof Short-Circuit Testing Authorities.

(viii) The standard Internal Arcing-Fault Test specified in Annex ZD of AS/NZS3439.1:2002 (limited arc, initiated on the load side of a protective devicewithin the functional unit being tested) shall be met and a test certificatedemonstrating that the results of the type tests were satisfactory shall beavailable. The testing facility shall be accredited by NATA or registered withthe Association of Short-Circuit Testing Authorities.

202.1.3 Custom-built Assembly Type CU

The following details shall apply to Custom-built Assemblies Type CU:

Note that type test certificates or satisfactory test reports for the type tests listed inclause 8 of AS/NZS 3439.1:2002 are not required.

(a) A Type CU assembly shall be a stationary cubicle-type assembly as defined inAS/NZS 3439.1:2002.

(b) A Type CU assembly shall comply with AS/NZS 3439.1:2002 as defined by thefollowing requirements:

(i) Form of separation shall be Form 1.

(ii) The degree of protection after installation in accordance with the

manufacturers instructions shall be IP51 for indoor installation and IP56 foroutdoor installation.


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(iv) Assemblies shall be floor mounted or wall mounted. Wall mounting isacceptable only if the frontal area of the assembly has an area less than 2square metres

(v) For outdoor switchboards containing busbars, pollution degree 3 shall apply

at locations further than 1km in a direct line from the coast or at altitudesbelow 1000 metres. Otherwise, pollution degree 4 shall apply.





202.1.4 Custom-built Assembly Type DT

The following details shall apply to Custom-built Assemblies Type DT:

(a) A Type DT assembly shall be a stationary cubicle-type assembly or multi-cubicle-type assembly as defined in AS/NZS 3439.1:2002.

(b) A Type DT assembly shall comply with AS/NZS 3439.1:2002 as defined by thefollowing requirements:

(i) Form of separation shall be Form 3b or 4a.



(iv) Assemblies shall be floor mounted.

(v) For outdoor switchboards containing busbars, pollution degree 3 shall applyat locations further than 1km in a direct line from the coast or at altitudesbelow 1000 metres. Otherwise, pollution degree 4 shall apply.



For Main Incoming Supply Compartments, Motor Starter Compartments andDistribution Feeder Compartments with one feeder in the Distribution FeederCompartment:


Disconnection of all live parts that can be unintentionally touched afterthe door has been opened. (Meet clause 7.4.2.2.3 b) of AS/NZS3439.1:2002.)



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For Common Control Compartments:


Shielding all live parts in such a manner that they cannot beunintentionally touched when the door is opened or the cover is removed.

(Meet clause 7.4.2.2.3 c) of AS/NZS 3439.1:2002.)

For Distribution Compartments with one main protective device plus anumber of subcircuit protective devices:

Requirement of a key or tool to gain entry into the switchboard. (Meetclause 7.4.2.2.3 a) of AS/NZS 3439.1:2002.) for the compartment doorand for the escutcheon.

(vii) Assemblies shall be Partially Type Tested Assemblies or Type TestedAssemblies with type test certificates or satisfactory test reports for the typetests listed in clause 8 of AS/NZS 3439.1:2002. Documentation shall beavailable to demonstrate that the results of type tests were satisfactory. Thetesting facility shall be accredited by NATA or registered with the Association

of Short-Circuit Testing Authorities.(viii) The special Internal Arcing-Fault Test (unlimited arc, initiated on the line

side of the protective device within the functional unit being tested) requiredby Appendix ZD.6 of AS/NZS 3439.1:2002 shall be met and a test certificatedemonstrating that the results of the type tests were satisfactory shall beavailable. The duration of the test shall be chosen by the manufactureraccording to the time response of the electrical protection devices. If detailsof these devices are not known, a power supply duration of at least 100milliseconds shall apply. The testing facility shall be accredited by NATA orregistered with the Association of Short-Circuit Testing Authorities.

202.1.5 Custom-built Assembly Type DU

The following details shall apply to Custom-built Assemblies Type DU:Note that type test certificates or satisfactory test reports for the type tests listed inclause 8 of AS/NZS 3439.1:2002 are not required.

(a) A Type DU assembly shall be a stationary cubicle-type assembly or multi-cubicle-type assembly as defined in AS/NZS 3439.1:2002.

(b) A Type DU assembly shall comply with AS/NZS 3439.1:2002 as defined by thefollowing requirements:

(i) Form of separation shall be Form 3b or 3bi, 3bh, 3bih, 4a, 4b, 4ah, 4ai, 4aih,4bh, 4bi, 4bih.







For Main Incoming Supply Compartments, Motor Starter Compartments and

Distribution Feeder Compartments with one feeder in the Distribution FeederCompartment:


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For Distribution Compartments with one main protective deviceplus a number of subcircuit protective devices:


202.1.6 Custom-built Assembly Type DUPLUS

The following details shall apply to Custom-built Assemblies Type DUPLUS:

Note that type test certificates or satisfactory test reports for the type tests listed inclause 8 of AS/NZS 3439.1:2002 are not required except for the Verification ofshort-circuit withstand test, Clause 8.2.3 of AS/NZS 3439.1:2002, for the busbarsystem.

(a) A Type DUPLUS assembly shall be a stationary cubicle-type assembly or multi-cubicle-type assembly as defined in AS/NZS 3439.1:2002.

(b) A Type DUPLUS assembly shall comply with AS/NZS 3439.1:2002 as defined bythe following requirements:

(i) Form of separation shall be Form 3b or 3bi, 3bh, 3bih, 4a, 4b, 4ah, 4ai, 4aih,4bh, 4bi, 4bih.







For Main Incoming Supply Compartments, Motor Starter Compartments andDistribution Feeder Compartments with one feeder in the Distribution FeederCompartment:



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202.1.7 Custom-built Assembly Type DTPLUS

The following details shall apply to Custom-built Assemblies Type DTPLUS:

(a) A Type DTPLUS assembly shall be a stationary cubicle-type assembly or multi-cubicle-type assembly as defined in AS/NZS 3439.1:2002.

(b) A Type DTPLUS assembly shall comply with AS/NZS 3439.1:2002 as defined bythe following requirements:

(i) Form of separation shall be Form 4b.

(ii) The degree of protection after installation in accordance with the

manufacturers instructions shall be IP51 for indoor installation and IP56 foroutdoor installation.






For Main Incoming Supply Compartments, Motor Starter Compartments and

Distribution Feeder Compartments with one feeder in the Distribution FeederCompartment:





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Shielding all live parts in such a manner that they cannot beunintentionally touched when the door is opened or the cover is removed.

(Meet clause 7.4.2.2.3 c) of AS/NZS 3439.1:2002.)



(vii) Assemblies shall be Partially Type Tested Assemblies or Type TestedAssemblies with type test certificates or satisfactory test reports for the typetests listed in clause 8 of AS/NZS 3439.1:2002. Documentation shall beavailable to demonstrate that the results of type tests were satisfactory. Thetesting facility shall be accredited by NATA or registered with the Association

of Short-Circuit Testing Authorities.(viii) The special Internal Arcing-Fault Test (unlimited arc, initiated on the line

side of the protective device within the functional unit being tested) requiredby Appendix ZD.6 of AS/NZS 3439.1:2002 shall be met and a test certificatedemonstrating that the results of the type tests were satisfactory shall beavailable. Further to Clause ZD.2 (Relevance of Tests) of AS/NZS3439.1:2002, the special internal arcing-fault test shall be applicable to allcompartments. The duration of the test shall be chosen by the manufactureraccording to the time response of the electrical protection devices. If detailsof these devices are not known, a power supply duration of at least 100milliseconds shall apply. The testing facility shall be accredited by NATA orregistered with the Association of Short-Circuit Testing Authorities.

202.1.8 Manufacturer of the Switchboard.

(a) Custom-built Assemblies Type DTPLUS

The firm in whose name the test certificates have been issued shall completelymanufacture the switchboard at its workshop.

(b) Other Custom-built Assemblies

For Custom-built Assemblies, other than Type DTPLUS, where a proprietarymodular switchboard system is offered, the switchboard builder shall have beenappropriately trained and have the appropriate level of accreditation to build theswitchboard from the manufacturer of the modular switchboard system.

203 FAULT LEVELS AND LIMITATION

203.1 Fault Levels and Time of Duration

The indicated fault level shall apply. The fault level being the prospective symmetricalr.m.s. value at the switchboard input terminals. Conductors and equipment shall besuitable for a time not less than that determined in the following manner:

(a) On any conductor or equipment:-

one (1) second.

(b) On any conductor or equipment protected by a consumer's line side fuse or fastacting circuit breaker: the actual cut-off time or trip out time at the indicated faultlevel where it is not less than 10 milliseconds.

Where the actual cut-off time or trip out time of the consumer's line side fuse orfast acting circuit breaker is less than 10 milliseconds, then the conductors and

7/27/2019 Electrical Service Mini

electrical service minimum requirment

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