Download MEW E101 April 2013 (pdf, 280kb) - NSW Public Works

Part 1 - Installation
108.8 Conduits in Concrete
108.8.1 Generally
Unless otherwise indicated, conduits shall not be run in the concrete topping. Conduits
run 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 of
rods 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 the
number of conduits in any one location to a minimum. Conduits in slabs shall be spaced
not less than 75 apart.
Conduits may cross providing they intersect at angles greater than 30 degrees and are
tied together. The minimum cover over conduits shall not be less than the conduit
diameter or 20.
Conduits shall not be installed in a slab through the areas around a column to one
quarter the 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,
broken or damaged is mandatory.
Two working days notice shall be given to the Superintendent's Representative to
inspect all conduits prior to pouring concrete. Sufficient time for alterations or
modifications found necessary during inspection by the Superintendent's Representative
shall be allowed.
108.8.2 Conduits in Suspended Slabs
Unless otherwise indicated, the maximum diameter of conduits in suspended slabs shall
be 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 each
column. No more than two conduits shall cross any one face of the column and all
conduits shall be placed centrally.
Bends in conduits entering the columns shall have a minimum radius of 300. Structural
columns 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 not
exceeding 30 metres for straight runs and at intervals not exceeding 25 metres for runs
including 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 prevent
undue deformation of the cables.
For underground conduit systems, draw-in boxes are not permitted. Provide pit at
maximum 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. A
length of cord 2000 long shall be left securely fixed at the ends of each run. Conduits
and pipes shall be labelled in accordance with Clause 603.
Conduits and pipes terminated outside a building shall be taken beyond the line of
paving, the draw cord shall be secured and the conduit or pipe capped, waterproofed
and the location marked in accordance with Clause 105.5.
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MEW E101