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NEMA RN 3 1991 Edition, January 1, 1991
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Product Identification Numbers for Metallic Tubular Conduit Products for Use with Bar Coding and Electronic Data Interchange Applications
Includes all amendments and changes through Reaffirmation Notice , 2002
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ANSI/NEMA MW 1000, 2014
This Standards Publication sets forth item identification numbers for metallic tubular conduit products. The products covered are Galvanized Rigid Conduit (GRC), Electrical Metallic Tubing (EMT), Intermediate Metal Conduit (IMC), Galvanized Rigid Aluminum Conduit, including elbows, threaded couplings and nipples customarily furnished on or with the conduit.

The numbers listed are intended to cover like products produced by multiple manufacturers on a repetitive basis.

The identification numbers are intended for use in bar coding, EDI, and other business communications.