Do EMT comply with the requirements of NFPA ?

Members of the Conduit Committee of the Steel Tube Institute apply a zinc coating to galvanize steel RMC, IMC and EMT. Therefore, these products are “protected by corrosion protection” as the Code requires. However, in severe corrosive environments, the designer or AHJ may decide to require additional or supplementary protection. If supplementary corrosion protection is required or desired, it can be provided by a factory-applied PVC coating, paint approved for the purpose, or tape wraps approved for the application. 

Steel conduit is zinc-galvanized for corrosion protection. Underwriters Laboratories exposed rigid steel conduit and steel intermediate metal conduit and electrical metallic tubing to a 4 hour ASTM E119 fire test at a temperature of 2000°F.

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