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Old 12-13-2012, 07:44 AM   #1
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NEC Section for isolating neutral from ground


Does anyone happen to know the NEC section that covers isolating neutrals from grounds in subpanels?

Having a discussion with someone and I can't find it. Thanks!

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Old 12-13-2012, 09:46 AM   #2
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NEC Section for isolating neutral from ground


250.32 (b)(1)for buildings or structures detached from the structure or building with the service equipment.

250.24(a)(5) for load side of service equipment.

Note prior to 1996 code cycle you were allowed to bond a 3 wire feeder to a detached structure or building. There are many thousands of those existing today, especially in farm and rural settings. Not to mention the 3 wire dryer and ranges out there.

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Old 12-13-2012, 07:58 PM   #3
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NEC Section for isolating neutral from ground


What about for attached subpanels? Is there any code stipulation? Thanks.
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Old 12-13-2012, 08:54 PM   #4
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NEC Section for isolating neutral from ground


Do you mean in the same building as the service?
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Old 12-13-2012, 08:56 PM   #5
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NEC Section for isolating neutral from ground


Exactly, Jim. Sorry.
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Old 12-13-2012, 09:04 PM   #6
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NEC Section for isolating neutral from ground


They have always required a 4 wire feeder and isolated neutrals and grounds as long as I know.

The exception was to a detached structure as was already mentioned. This was allowed only if there were no metallic paths between the structures like a water line, phone or cable etc.
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Old 12-13-2012, 09:07 PM   #7
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NEC Section for isolating neutral from ground


Which code article describes the NEED for the isolated ground?
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Old 12-13-2012, 09:13 PM   #8
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NEC Section for isolating neutral from ground


250.24 (a)(5)

Quote:
load-side grounding connections. A grounded conductor
shall not be connected to normally non–currentcarrying
metal parts of equipment, to equipment grounding
conductor(s), or be reconnected to ground on the load side
of the service disconnecting means except as otherwise permitted
in this article.

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