Electrical conduits are an electrical piping system made of plastic, metal, or fiber, that are used to provide wiring or cable route to protect it. The use, form and installation details for electrical conduits are specified by the wiring regulations such as the US National Electrical Code (NEC) or other national or local code.
The location of an electrical conduit will usually determine what kind of material may be used. Since electrical conduits are used mainly in the outer wall surface in exposed locations, they are made of a material that is either flexible or rigid.
The following are the most commonly used materials:
Rigid steel The type of conduit system that is to be applied depends upon the wall thickness, mechanical stiffness and the material used to make the tubing. The material can be chosen for mechanical protection, corrosion resistance and for cutting the costs on installation charges. As far as wiring regulations for electrical equipment in hazardous areas are concerned, certain kinds of conduits need to be used depending on the regulation specifications.