Conduit comes in many styles and is used to run electrical wiring in exposed locations in and around your home. It may be a basement, garage, barn, laundry areas, and also exposed areas.
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A coupling
An electrical conduit is a tube used to protect and route electrical wiring in a building or nonbuilding structure. Electrical conduit may be made of metal, plastic, fiber, or fired clay. Most conduit is rigid, but flexible conduit is used for some purposes.
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A conduit blender is a tool that is used to bend conduit piping. This allows electricians to bend conduit piping around corners so that they do not have to use connector joints.
Metalic conduit is a metal tube that is used to shield wiring from damage, water contamination, contact with people. As opposed to plastic conduit.
A conduit connecter is a connecting piece used to connect two individual conduit units together. Conduit connecters can refer to both electrical conduits and pipe/plumbing related conduits.
A conduit bushing is used when a conduit is terminated in a junction box or enclosure. Its purpose is to provide a smooth rounded surface so that when the wire is pulled into the conduit the insulation on the wire will not be damaged.
It's called a Weatherhead.
The type of conduit system is governed by two factors. One the code book states what type of system can be places in what specific locations. The second factor is what the electrical engineer specifies that what he wants the conduit system to be on his project. EMT is used in the majority of jobs for industrial and commercial projects. As a conduit system it is easy to install and more circuits can be added to the system very easily abiding by the code book rules for conduit fill.