Specifications

166
NLUO PMC CONTRACTOR
SIGNATURE AND SEAL SIGNATURE AND SEAL SIGNATURE AND SEAL
TECHNICAL SPECIFICATION FOR CONDUIT WIRING SYSTEM
1. Type and size of conduit :
All conduit pipe shall be screwed type, solid drawn or welded and with black stove enameled surface or galvanised and of
thickness conforming to IS : 9537 part II of 1981 (or latest revision) in all respects. The conduits are to be free from burrs and
internal roughness. No conduits less than 20 mm in dia shall be used, unless specified.
2. Accessories :
Only screwed type of accessories are to be used.
3. Conduit Joints :
The conduit shall be properly earthed. In long distance straight runs of conduit either inspection type screwed couplers are to
be provided at reasonable intervals on running threads with couplers and jam nuts. Threads on conduit pipes in all cases shall
be between 13 mm to 27 mm long sufficient to accommodate pipes to full threaded portion of couplers or accessories. Cut end
of conduit pipes shall have no sharp edges or any burrs left to avoid damage to insulation of conductor while pulling them
through such pipes.
4. Protection against dampness and rust :
In order to minimize condensation and sweating inside the tube, all outlets of pipes system shall be properly drained and
ventilated, but in such a manner as to prevent entry to insects inside the conduit.
To protect against rust the outer surface of the conduit and accessories shall be painted and the bare thread portion is to be
portions with anti corrosive preservative.
5. Fixing of Conduits :
conduits pipes shall be fixed by heavy gauge saddles and h.w. or metal bars, secured to wall / ceiling by screws driven into
wood plugs or rawl plug or phil plugs at an interval or not more than 76 cm apart for vertical run and 60 cm apart for