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Old 03-31-2009, 07:51 PM   #1
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Commercial service


In a commercial building, is a conduit that leaves the switchgear to feed a distribution board considered a service raceway?

I'm trying to figure out if the conduit would need a bond bushing on one end. I say no but another guy says yes.

What about raceways that go from switchgear to another section of gear in another location?


Last edited by Steven Jackson; 03-31-2009 at 07:54 PM.
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Old 03-31-2009, 08:22 PM   #2
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Quote:
Originally Posted by Steven Jackson View Post
In a commercial building, is a conduit that leaves the switchgear to feed a distribution board considered a service raceway?

I'm trying to figure out if the conduit would need a bond bushing on one end. I say no but another guy says yes.

What about raceways that go from switchgear to another section of gear in another location?
I would say it's a feeder, not a service, but the same logic would apply. Any metal conduit that feeds any piece of equipment at 100 A or more, I would use a bond bushing on each end as well as an EGC.

Especially since the metal cabinets are enameled and nobody ever scrapes the paint off to make a secure connection with a locknut.

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Old 03-31-2009, 09:52 PM   #3
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277 is correct. This would be considered a feeder. Also correct about being good practice to bond these raceways. I believe if they are 277/480 feeders the grounding bushing is required. ( Though still not considered a service raceway)
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