NFPA 496
Standard for Purged and Pressurized Enclosures for Electrical Equipment
Published by National Fire Protection Association (NFPA)
The CFR incorporates NFPA 496 by reference, which makes the edition it names part of the regulation. The CFR requires the edition it names, which may not be the newest. To enforce any other edition, the agency must publish the change in the Federal Register.
The edition the CFR requires
NFPA 496, 2017 Edition, ANSI-approved June 2, 2016
As the CFR lists it: “NFPA 496, Standard for Purged and Pressurized Enclosures for Electrical Equipment, 2017 Edition, ANSI-approved June 2, 2016 (“NFPA 496 (2017)”)”
How to read it
- The publisher’s page for this standardNFPA 496 on nfpa.org ↗
- Read it freeNFPA free access ↗
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A free or purchased copy may not be the edition the CFR names; check it against the edition above. Every incorporated standard can also be inspected at the National Archives (NARA) and at the agency named in the section that lists it.
NFPA 496 is copyrighted by its publisher; RegKnot shows its title and the editions the CFR names, not its text. Read from the eCFR's incorporation-by-reference sections, current as of October 26, 2026. The regulation text governs. All standards the CFR requires.