How Many Varieties of Electrical Conduit are Available?
There are several types of electrical conduit available that can be installed with a variety of conduit fittings and electrical materials.
Rigid Nonmetallic Conduit
This is a kind of is unthreaded non-metallic tubing.
Rigid Metal Conduit
RMC or Rigid Metal Conduit is manufactured with metals like stainless steel or aluminum and sometimes even coated steel in the form of thick threaded tubing.
Electrical metallic tubing
EMT is also known as thin wall. This can be used with threaded fittings with the help of clamp-type conduit fittings. Coated steel and aluminum are the two metals used to manufacture EMT.
Electrical Nonmetallic Tubing
ENT is a kind of corrugated tubing with thin walls that carries flame retardant and moisture resistant properties. It can be easily bent and very flexible.
Galvanized rigid conduit
GRC is galvanized steel tubing with threaded and thick tubing wall.
Flexible Metallic Conduit
FMC are made with a ribbed strip of aluminum or steel and usually deployed in underground parking facilities. It may also be used with other electrical materials as an equipment grounding conductor.
Liquidtight Flexible Metal Conduit
LFMC has a waterproof plastic coating with a metallic flexible conduit construction very similar to FMC electrical conduit.
Liquidtight Flexible Nonmetallic Conduit
LFNC can be any variety of non metallic, flame resistant tubing with corrugated or smooth interior surfaces.
This is a rigid variety of conduit much like GRC used mostly in industrial and commercial environments because of its corrosion resistant qualities. From food processing plants to cleaning chemicals plants, these conduits should be used in place of GRC.
Intermediate metal conduit
IMC is usually threaded and made with steel. The tubing is lighter than RMC but heavier than EMT.
The lowest costing conduit is a PVC conduit which is also incredibly light weight. Various wall thicknesses are available depending on their usage: thin-walled PVC conduit should be used for embedded concrete use while thicker walled ones are more appropriate for exposed work and direct burial.
Underground Conduit Requirements
For installation between massive buildings and similar structures, underground conduit is required. This way the installation of communication and power cables is possible. A duct bank, assembly of conduits, can be encased in concrete or buried inside earth. These electrical conduit and electrical materials make it possible for damaged cables to be repaired and replaced. Additional cables can also be added with ease when a conduit duct bank is present. All this is done without excavating the area again. In most cases, PVC conduit is used for this purpose because not only does it lower the cost as compared to metal conduit, but the installation is also much easier.
Electrical Materials Required for Installation
Various electrical fittings and other materials like purpose designed fittings and explosion proof enclosures, are required to install electrical conduit.