Code Compliant?

[ken44]

An electrical contractor just finished with a remodel at one of our commercial buildings, I cited a code violation where the contractor failed to use locknuts on a 3" nipple that goes between two panels. The project manager is asking me, on their behalf, if they can use a UL Listed Split Bushing with a Grounding Lug by Bridgeport. My stance is that while this is a UL Listed product, it is not a replacement for the locknuts, and the mechanical strength and bonding that they provide. Input please?

 

[iwire]

How is the nipple presently installed? No locknuts at all? A plastic bushing?

 

[Ponchik]

IMO, no it is not compliant because it needs the interior lock nut. The grounding bushing may or may not be listed as a lock nut. ( I will look up my UL book)

 

[iwire]

IMO, no it is not compliant because it needs the interior lock nut. The grounding bushing may or may not be listed as a lock nut. ( I will look up my UL book)

A lock nut on the inside is not required when a bushing is used that is not entirely plastic.

See 300.4(G)