Specifications

169
NLUO PMC CONTRACTOR
SIGNATURE AND SEAL SIGNATURE AND SEAL SIGNATURE AND SEAL
TECHNICAL SPECIFICATION FOR
CONCEALED CONDUIT WIRING SYSTEM
1. Concealed conduit wiring system shall comply with all requirements for surface conduit wiring system as specified above and
in addition conform to the requirements specified below :
2. Making of Chase :
The chase in the wall shall be neatly made and be of ample dimensions to permit the conduit to be fixed in the manner desired.
3. Fixing of Conduit in Chase :
The conduit pipes shall be fixed by means of staples, J-Hooks or by means of saddles not more than 60 cm apart. Fixing of
standard bends or elbows shall be avoided as far as pipes with a long radius which will permit easy Tendered Drawing in of
conductor. All threaded joints of metallic conduits shall be treated with some approved preservative to secure protection
against rust.
4. Inspection Boxes :
Suitable inspection boxes shall be provided when necessary to permit periodical inspection and to facilitate removal of wires.
These shall be mounted flush with wall.
5. Types of accessories to be used :
All outlets such as switches, socket outlets, shall be flush mounting type with cast iron or M.S. boxes with a cover of approved
insulating materials. The switches and other outlets shall be mounted inside such boxes as would be approved. The metal box
shall be efficiently earthed with conduit by means of earthing attachment with No. 14 SWG G.I. wire, running inside the
conduit.
6. Conduits :
(i) Steel-Black enameled screw type M.S. conduits with thickness conforming to IS : 9537 part II or 1981 (or latest revision)