PACKAGE : I Bid Document VOLUME : II - Public Health Engineering

Fixing of Conduit:
Conduit pipes shall be fixed by heavy gauge clamps, secured to suitable wood plugs
or other approved plugs with screws in an approved manner at an interval of not
more than one metre but on either side of the couplers, bends, or similar fittings,
saddles shall be fixed at a distance of 30 cm from the centre of such fittings. The
saddle should not be less than 24 gauge for conduits upto 25mm dia. and not less
than 20 gauge for larger diameter.
Where conduit pipes are to be laid along the trusses, steel joints etc. the same shall
be secured by means of ordinary clips or girder lips as required by the Engineer-incharge.
Where it is not possible to drill holes in the truss members, suitable clamps
with bolts and nuts shall be used. The width and the thickness of the ordinary clips
or girders clips and clamps shall not be less than as stated below:
Switch Box:
Switch box shall be made of metal on all sides, except on the front.
In the case of cast boxes, wall thickness shall be at least 3 mm and in case of
welded mild steel sheet boxes the wall thickness shall not be less than 18 gauge for
boxes, upto a size of 20cm x 30cm and above this M.S. boxes shall be used. Except
where otherwise stated 3 mm thick phenolic laminated sheets like sunmica shall be
fixed on the front with brass screws. Clear depth of the box shall not be less than
60 mm and this shall be increased suitably to accommodate mounting of fan
regulators inflush pattern. All fittings shall be flush pattern. Only a portion of the
above box shall be sunk in the wall, the other portion being projected out for
suitable entry of conduit pipes into the box.
Conduit Wiring System
Conduit wiring system shall comply with all the requirements of surface conduit
wiring system specified in clauses above and in addition to the requirements
specified in the following clauses.
The chase in the wall shall be neatly made and ample dimensions to permit the
conduit to be fixed in the manner desired. In the case of buildings under
construction, fixed work, special care shall be taken to fix the conduit and
accessories in position along within the building work, to avoid damage to the
finished wall etc.
GTS : General Technical Specification. Page 128