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Joined: Feb 2003
Posts: 687
A
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I was at a small factory about 10,000 sf the other day and noticed something that did not look right to me.

There were 2 services because the bilding was devided in the past. Both 400 amp 3 phase. They each went into a 400 amp Disco and then straight to a bussway maybe 70' long. Off the 2 bussways fed the entire building. Maybe 6-8 panels in different locations 200 and 100 amp were run off the bussway. From those panels it must have fed the lighting, front office, HVAC, and general outlets. They also had the factory machines and a step up transformer off the same duct.

I looked in the NEC and could not find any violations with this. What's your opinion on this. Acceptibale or unaccepticable?

Tom

2017 / 2014 NEC & Related Books and Study Guides
Joined: Jan 2001
Posts: 1,044
Tom Offline
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Regarding the bus duct, I can't think of anything wrong here. This is a very flexible means of distributing power, kind of expensive, but if the power requirements change on a regular basis, might end up being the least expensive way of doing things.


Few things are harder to put up with than the annoyance of a good example.
Joined: Aug 2001
Posts: 599
N
Member
This is a common way of feeding high rise office buildings. Come out of the service gear with 4000A bus duct and run it vertical through the electric rooms. Each room has a place to set a couple of disconnects on the bus to feed the floor. From what you describe I see nothing wrong.

Joined: Jun 2004
Posts: 220
T
Member
so, how much DOES a bus weigh? [Linked Image]

Joined: Jan 2003
Posts: 4,391
I
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A lot when you are on the other end of the rope hauling them up the elevator shaft. [Linked Image]


Bob Badger
Construction & Maintenance Electrician
Massachusetts

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