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10-07-2008, 02:55 PM
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#1
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DIY
Join Date: Aug 2008
Location: Seattle, WA
Posts: 162
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Subpanel in detached garage
Another subpanel thread, yay! Searched, didn't find.
Subpanel in a detached garage, fed from 100 amp breaker in main panel. Do I have to maintain ground/neutral separation back to the main panel, or do the ground rods take care of this?
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10-07-2008, 03:05 PM
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#2
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Member
Join Date: Dec 2007
Location: Baltimore, MD
Posts: 1,802
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Subpanel in detached garage
Yes. Seperate the ground and neutral. You'll still need a ground rod at the garage.
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10-07-2008, 03:24 PM
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#3
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DIY
Join Date: Aug 2008
Location: Seattle, WA
Posts: 162
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Subpanel in detached garage
Thanks.
Somebody said grounding (subpanels) is a complicated issue. Is there any condition where one doesn't have to maintain ground/neutral separation?
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10-07-2008, 04:06 PM
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#4
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Member
Join Date: Dec 2007
Location: Baltimore, MD
Posts: 1,802
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Subpanel in detached garage
Quote:
Originally Posted by gp_wa
Thanks.
Somebody said grounding (subpanels) is a complicated issue. Is there any condition where one doesn't have to maintain ground/neutral separation?
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Yes, it's complicated. Yes, there are conditions where they aren't seperated, but not in your situation.
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10-07-2008, 09:27 PM
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#5
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My License Ain't 4 Sale..
Join Date: Feb 2008
Location: Atlanta, Ga/Hamilton, Al
Posts: 1,813
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Subpanel in detached garage
Quote:
Originally Posted by jerryh3
Yes, it's complicated. Yes, there are conditions where they aren't seperated, but not in your situation.
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Well, that actually depends on if there are any other metallic paths between his detached garage and the house (water lines, phone/cable, etc) and what code is in effect in his area. The 2005 code and earlier allows for a three-wire feed, with the neutral and EGCs bonded in the panel, and to a GEC. 2008 code has discontinued that practice. But, for safety's sake, I never like to use the three wire solution. So yes, use four wires.
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10-07-2008, 10:02 PM
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#6
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Member
Join Date: Sep 2008
Location: Portland, OR
Posts: 1,186
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Subpanel in detached garage
Quote:
Originally Posted by InPhase277
Well, that actually depends on if there are any other metallic paths between his detached garage and the house (water lines, phone/cable, etc) and what code is in effect in his area. The 2005 code and earlier allows for a three-wire feed, with the neutral and EGCs bonded in the panel, and to a GEC. 2008 code has discontinued that practice. But, for safety's sake, I never like to use the three wire solution. So yes, use four wires.
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I like the 4 wires also and do that on all my remote buildings.
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10-07-2008, 10:11 PM
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#7
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UAW SKILLED TRADES
Join Date: Jan 2007
Location: Kansas
Posts: 4,584
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Subpanel in detached garage
Washington State has a statewide electrical code and it is mandatory that 4 wire feeds be installed to all panels load side of the service equipment to residential detached structures/buildings. Best I can tell this has been in effect as a state amendment to the NEC since 1999.
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