Hubs and integrated enclosure threads, Service & GEC raceways

Carultch

Senior Member
Location
Massachusetts
I'm aware that metal service raceways require a bonding bushing on at least one end, and metal GEC raceways require it on both ends.

How does this apply when you have an enclosure that has either a bolt-on or built-in hub, where obviously you cannot apply a bonding bushing? While it is possible to do an external listed u-bolt bonding method, but is it required in these instances?
 
Last edited:

texie

Senior Member
Location
Fort Collins, Colorado
Occupation
Electrician, Contractor, Inspector
I'm aware that metal service raceways require a bonding bushing on at least one end, and metal GEC raceways require it on both ends.

How does this apply when you have an enclosure that has either a bolt-on or built-in hub, where obviously you cannot apply a bonding bushing?
See 205.92(B)(2). Keep in mind if you use a "Myers" type hub it must be a grounding type as they do make 2 kinds.
 

tom baker

First Chief Moderator
Staff member
A bolt on hub is recognized in 250.92 as one of the acceptable methods for service raceway bonding.
Note a change in 230.28 (A) for the 2014 NEC requires the hub used for a service mast to be identified for use with service entrance equipment
 
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