The choice of conduit and fittings is subject to kind of work being executed and the specifications required.
Appropriate gauge conduit is selected for surface fixing and suitable conduit is chosen for concealed installations. Conduit used in surface installations should be secured using saddles/spacer bar saddles. Distancing between supports shall be 1.5 meters for horizontal run and 1.75 meters for vertical run for the conduit sizes of 20 and 25mm diameter. For 32 and 38mm diameter conduits, saddle
support shall be 1.75 horizontal and 2.0 meter vertical is recommended. 2.0 meter horizontal and vertical distancing is suggested for 50mm diameter conduit. In surface fixing, whenever mounting boxes/bends are used, conduit shall be secured with spacer bar saddle within 20cms on either side of fitting to give a firm support for installation. Where conduits are to be embedded in concrete, securing of conduits
with reinforcing/formwork is desired to avert displacing of conduits while read-mix concrete pouring and subsequent vibrating of concrete mix.

Conduits have a tendency for expansion/contraction at changing ambient temperature. For facilitating this phenomenon, recommended for it's using expansion couplers for every 6- meter ruin avert conduit kinking and buckling. Expansion couplers are installed with the solvent cement applied on short spout of expansion coupler and pushing conduit firmly into notching. Use appropriate water resistant lubricating sealant on the other end and position conduit at midpoint of long spout for aiding expansion and contraction in the saddles. Joining of conduit into various fittings viz., couplings, adaptors, junction boxes, bends and mounting boxes are easily joined by using Comat solvent welding cement. Due care need to be taken for proper surface preparation of components. Cut conduit to required length using fine toothed hacksaw or pipe cutter and remove al burrs and loose dust. Apply evenly a layer of solvent cement to the pipe and fitting with a quarter turn to evenly spread the solvent. cement wiping off any excess. cement from the components

All NEWPRO conduits of different gauges under 25mm OD size can be easily bent cold by using designated bending spring. Ensure using of correct size and gauge. Insert the spring into desired position, grip the conduit on either sides and exert force by hand. or place the conduit across the knee and continue bending slowly but progressively until bend is slightly beyond the angle required. Now, allow the conduit to recover back to the desired position. To remove the spring from conduit, twist it in anti-clockwise direction while rotating the conduit clockwise simultaneously pulling them slowly apart. Bending of conduits above 25mm size shall be carried out with hot bending technique. Insert proper size of spring into the conduit as explained above and immerse bending portion in boiling water or use a radiant heat source. When the conduit softens, used a suitable former and continue holding until bend is set to required angle.

Size of the conduit is explicitly governed by IEE publication to ensure accommodating maximum number of cables of the same size, or different sizes for complying with the requirement of regulations. This is necessitated to make certain the number of cables drawn into conduit or a wiring system shall be such that no damages caused to the cables and conduits while carrying out the installation