Hubs and integrated enclosure threads, Service & GEC raceways

[Carultch]

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?

 

[jumper]

Pretty sure hubs are listed for bonding between enclosure and metallic raceways. The hubs are usually attached using machine threaded screws/bolts.

 

[Carultch]

Pretty sure hubs are listed for bonding between enclosure and metallic raceways. The hubs are usually attached using machine threaded screws/bolts.

Is it true even in the specific cases of service and GEC raceways.

 

[texie]

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.

 

[jumper]

99% positive on yes. On phone, no NEC.

 

[Smart $]

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.

I agree.

 

[tom baker]

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