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#78833 - 10/27/01 07:31 PM Generator disconnect
lousen Offline
Junior Member

Registered: 07/21/01
Posts: 8
Loc: Bryn Mawr, Pa. U.S.A.
Does generator supply entering bldg. underground require a disconnect in bldg? Gen. is 80 feet from bldg.Gen. load 200kva at 208v.

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#78834 - 10/28/01 03:20 AM Re: Generator disconnect
sparky Offline
Member

Registered: 10/18/00
Posts: 5545
Hi lousen!~
good Q
445.18 requires a disco for a genny, but does not specify where...
225-32, general rule , requires a disco. ex#1 could be applied.
If i'm reading this right (part 2 of 225) it matters if the genny serves the outbuilding or not.
others may clarify this better than I

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#78835 - 10/28/01 08:11 AM Re: Generator disconnect
Nick Offline
Member

Registered: 08/13/01
Posts: 603
Loc: Riverside, CA
As a general rule yes. See 225-31. As Sparky stated Ex #1 in 225-32 could be applied but this would have to be acceptable to the AHJ. I don’t believe many would be inclined to accept this.

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#78836 - 10/28/01 03:33 PM Re: Generator disconnect
sparky Offline
Member

Registered: 10/18/00
Posts: 5545
Lousen,
can you give us more info here? what is the genny used for? etc..

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#78837 - 10/28/01 07:03 PM Re: Generator disconnect
lousen Offline
Junior Member

Registered: 07/21/01
Posts: 8
Loc: Bryn Mawr, Pa. U.S.A.
Gen.set mentioned before supplys single owner nursing home.If I open main service disconnect in basement in a fire emergency, Gen. set kicks in.which means power is back on. Nearest disconnect is at Gen. set-80 feet away.This installation is completed but not inspected.

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#78838 - 10/29/01 03:40 AM Re: Generator disconnect
Geno Offline
Member

Registered: 08/27/01
Posts: 16
Loc: Syracuse, NY USA
The answer is yes you do need a disconnect within sight. Check out 700.12(B)(6) in the 2002 NEC.

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