1 Scope

1.1 These requirements cover aluminum and stainless steel electrical metallic tubing (EMT) and elbows in trade sizes 3/8 – 6 (12 – 155) for use as a metal raceway for the installation of wires and cables in accordance with the NFPA 70^®, National Electrical Code^® (NEC^®).

NFPA 70^®, National Electrical Code^®, and NEC^® are registered trademarks of the National Fire Protection Association, Quincy, MA.

1.2 Tubing provided with an exterior coating of zinc or a zinc-based, nonmetallic, or other alternate corrosion-resistant material and an interior coating of an organic or zinc material, is covered by the Standard for Electrical Metallic Tubing – Steel, UL 797.

Summary of Topics

This new Fourth Edition of ANSI/UL 797A dated March 19, 2026 includes updates to the Scope, Units of Measurement, Referenced Publications, and other editorial corrections and updates to align with current style and format.