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ANSI C80.6-2025
Intermediate Metal Conduit (EIMC)
This standard covers the requirements for steel electrical intermediate metal conduit for use as a raceway for wires or cables of an electrical system. Finished conduit is produced in nominal 10 ft. (3.05 m) lengths, threaded on each end with one coupling attached. It is protected on the exterior surface with a metallic zinc coating or an alternate corrosion protection coating (See UL 1242 for alternate corrosion-resistant coating(s) requirements) and on the interior surface with a zinc or organic coating.
NEMA: National Electrical Manufacturers Association [nema]