NEC rules on grounding strut-type channel raceway
When working with strut-type channel raceway, when is it permissible to use a snap-fit metal cover to provide electrical continuity for receptacles mounted in the cover?
A. Any time. This is always acceptable.
B. You're not permitted to use a snap-fit metal cover to provide electrical continuity for receptacles mounted in the cover.
C. Only when the metal cover is a minimum of 1/16 in. thick
D. Only when the metal cover is a minimum of 1/8 in. thick
Article 384 of the 2011 NEC covers strut-type channel raceway. As noted in 384.60, "Where a snap-fit metal cover for strut-type channel raceways is used to achieve electrical continuity in accordance with the listing, this cover shall not be permitted as the means for providing electrical continuity for a receptacle mounted in the cover."
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