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#87115 - 01/21/04 06:19 PM Generator OCPD listed for service entrance
Roger Offline
Member

Registered: 05/18/02
Posts: 1779
Loc: N.C.
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

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#87116 - 01/22/04 06:15 AM Re: Generator OCPD listed for service entrance
russ m Offline
Member

Registered: 02/22/03
Posts: 165
Loc: Burbank,IL,USA
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?

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#87117 - 01/22/04 01:53 PM Re: Generator OCPD listed for service entrance
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: IL
Roger,
Is the generator in the same building as the MDP?
Don
_________________________
Don(resqcapt19)

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#87118 - 01/22/04 02:50 PM Re: Generator OCPD listed for service entrance
Roger Offline
Member

Registered: 05/18/02
Posts: 1779
Loc: N.C.
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

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#87119 - 01/22/04 05:45 PM Re: Generator OCPD listed for service entrance
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: IL
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)

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#87120 - 01/23/04 09:27 AM Re: Generator OCPD listed for service entrance
PCBelarge Offline
Member

Registered: 06/08/03
Posts: 657
Loc: Dobbs Ferry, NY, USA
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

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#87121 - 01/26/04 10:50 AM Re: Generator OCPD listed for service entrance
tdhorne Offline
Member

Registered: 03/22/01
Posts: 344
Loc: Maryland, USA
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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