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Joined: May 2002
Posts: 1,716
R
Roger Offline OP
Member
Opinions with code references please.

Optional Standby Generator with 600 amp breaker in onboard enclosure, Service Rated and Listed by special order.

Generator is SDS and sits 50' from entrance into mech room where another switch is installed adjacent to Normal power MDP.

Does anybody know of a reason per any codes that there should be a Service Rated Switch installed closer to the building, or that the interior switch should be located nearest point of entrance per 230.70(A)(1).

Also with this Service Disconnect located at the Generator, wouldn't we be meeting 230.72(B)?

Roger

2017 / 2014 NEC & Related Books and Study Guides
Joined: Feb 2003
Posts: 169
R
Member
I'm stumped!
Can't help at all.
Doesn't the feeder usually go directly from main switch in the generator to the tansfer switch?

Joined: Nov 2000
Posts: 2,148
R
Member
Roger,
Is the generator in the same building as the MDP?
Don


Don(resqcapt19)
Joined: May 2002
Posts: 1,716
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Roger Offline OP
Member
Hello Russ and Don.

Don the generator sits outside the building and is feeding a UPS in a computer room. (this is at a university and backs up the network campus wide)

The state inspector, who I've not spoke with yet, left the job with out inspecting the installation saying or implying the generator disconnect (enclosed breaker) could not be used for the service disconnect even though it is listed as such.

Roger

Joined: Nov 2000
Posts: 2,148
R
Member
Roger,
If the generator is at a second building then wouldn't 225.31 require a disconnect at the main building located per 225.32? Or does this installation meet Exception #1 to 225.32?
Don


Don(resqcapt19)
Joined: Jun 2003
Posts: 681
P
Member
The generator is not a service as per the 2002 NEC.
Service (Article 100). The conductors and equipment for delivering electric energy from the serving utility to the wiring system of the premises served.

This installation falls under 225.30(A)(4)

I believe as Don has stated that the exception #1 to 225.32 would make the described installation compliant with the NEC. The switch still has to follow 225.36 Suitable for Service Equipment.

Pierre


Pierre Belarge
Joined: Mar 2001
Posts: 345
T
Member
For most AHJs the conditions of maintenance and supervision that would fulfill the exception is full time on site electrical staff.
--
Tom H


Tom Horne

"This alternating current stuff is just a fad. It is much too dangerous for general use" Thomas Alva Edison

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