IEC 61439-6
Low-voltage switchgear and control gear assemblies—Part 6: Busbar trunking systems (busways)
Published by International Electrotechnical Commission (IEC)
The CFR incorporates IEC 61439-6 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
IEC 61439-6:2012, Edition 1.0, 2012-05
As the CFR lists it: “IEC 61439-6:2012, Low-voltage switchgear and control gear assemblies—Part 6: Busbar trunking systems (busways), Edition 1.0, 2012-05”
- Listed in 46 CFR 110.10-1(k)(40); required by46 CFR 111.59-1 ↗
How to read it
- Where to get itIEC Webstore ↗
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.
IEC 61439-6 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.