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Generator disconnect #78833 10/27/01 10:31 PM
Joined: Jul 2001
Posts: 6
lousen Offline OP
Junior Member
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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Re: Generator disconnect #78834 10/28/01 07:20 AM
Joined: Oct 2000
Posts: 5,389
sparky Offline
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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Re: Generator disconnect #78835 10/28/01 12:11 PM
Joined: Aug 2001
Posts: 599
Nick Offline
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.

Re: Generator disconnect #78836 10/28/01 07:33 PM
Joined: Oct 2000
Posts: 5,389
sparky Offline
can you give us more info here? what is the genny used for? etc..
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Re: Generator disconnect #78837 10/28/01 11:03 PM
Joined: Jul 2001
Posts: 6
lousen Offline OP
Junior Member
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.

Re: Generator disconnect #78838 10/29/01 07:40 AM
Joined: Aug 2001
Posts: 16
Geno Offline
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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