Steel conduit and electrical metallic tubing (EMT)
refers to the steel-based durable enclosures that route individual
electrical wiring conductors in a building or structure and protect the
wires from impact, moisture, and chemical vapors.
are classified by wall thickness, mechanical stiffness, and material
used. Rigid metal conduit (RMC) is a thick-walled threaded tubing,
usually made of coated steel, stainless steel, or aluminum. Galvanized
rigid conduit (GRC) is galvanized steel tubing, with a tubing wall that
is thick enough to allow it to be threaded. Intermediate metal conduit
(IMC) is a thinner, lighter-weight version of RMC. Polyvinyl chloride
(PVC)–coated steel conduit is used for highly corrosive environments.
Related products include conduit and associated elbows, threaded
couplings, and nipples.
Since conduit must be installed in accordance with the National Electrical Code®
(NEC) and all applicable local regulations, Members develop proposals
for the NEC, International Code Council codes, and other codes.