Download MEW E101 April 2013 (pdf, 280kb) - NSW Public Works
Download MEW E101 April 2013 (pdf, 280kb) - NSW Public Works
Download MEW E101 April 2013 (pdf, 280kb) - NSW Public Works
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Part 1 - Installation<br />
Generally, UPVC conduit shall not be installed on exterior surfaces. However, sunlight<br />
resistant UPVC conduit and fittings complying with AS 2053 and marked with the letter<br />
"T" may be run in locations exposed to direct sunlight. In sewage treatment works all<br />
external conduits below 40mm shall be "Clipsal HFT". Also, short runs of HD-UPVC<br />
pipes from underground submains may be surface run where they enter a building if it is<br />
not practicable to conceal them, provided that they are suitably protected from<br />
mechanical damage and sunlight.<br />
All UPVC conduits shall be terminated into metal boxes and enclosures (draw-in-boxes,<br />
joint boxes, switchboards, ducting etc.) via a screwed PVC adaptor with lock nut.<br />
Conduits shall be so installed that wiring is carried out using the "draw-in, loop-in"<br />
system.<br />
The conduit run shall be completely installed before wiring is drawn in.<br />
The wiring shall be drawn in only at outlets and switchboards and, if approved, at draw-in<br />
boxes. Inspection fittings are allowed only if approved.<br />
Conduits shall be run directly from the entry point to the termination point with the<br />
minimum number of sets (the number of sets shall not be greater than the equivalent of 3<br />
x 90 degree bends). The installation of elbows, tees, etc., is prohibited on conduits<br />
installed in inaccessible locations.<br />
All conduits shall be effectively capped during construction.<br />
Conduits shall be securely fixed to building members and shall be adequately supported<br />
during all stages of building construction. (Particular care shall be taken to support PVC<br />
conduit upstands). Generally all conduits shall be concealed and only exposed to view<br />
when approved.<br />
Surface conduits shall be made to harmonise as far as practicable with the architectural<br />
features of the building. Surface conduits shall be run in vertical and horizontal<br />
directions except where it is desirable to follow the line of a building, where the approval<br />
of the Superintendent shall be obtained.<br />
Conduits shall terminate in luminaires, equipment, accessories or in wall boxes and<br />
junction boxes of a type compatible with the installation.<br />
Do not exceed the following space factors:-<br />
1 cable in the conduit - 50% of the area<br />
2 cables in the conduit - 30% of the area<br />
3 or more cables in conduit - 40% of the area<br />
108.6.2 Conduit Saddles<br />
Conduit saddles shall be either PVC or stainless steel. PVC saddles may be used<br />
indoors and in wet wells or areas not exposed to sunlight. All other situations shall be<br />
stainless steel saddles.<br />
108.6.3 Expansion Joints<br />
Expansion fittings shall be installed on all straight runs of UPVC plastic conduit, except<br />
those embedded in concrete or wall chases. The spacing of expansion fittings shall not<br />
be greater than 8000. A sample of the type of expansion fitting to be used shall be<br />
submitted prior to installation. Conduit clips shall be installed close to expansion fittings;<br />
all clips shall be installed to allow the conduit to move freely while expanding or<br />
contracting.<br />
Expansion couplings shall be installed wherever expansion or contraction joints occur in<br />
a building slab. Note: "Bellows" type expansion couplings shall not be used in floor slabs<br />
or similar installations.<br />
Each expansion coupling in a building slab shall consist of a short length of flexible<br />
conduit, to join the two UPVC conduits across the expansion joint, covered by a larger<br />
UPVC conduit. The larger conduit shall extend 150 from the flexible conduit in both<br />
Page 16<br />
<strong>MEW</strong> <strong>E101</strong>