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#163135 - 05/01/07 06:19 PM Subpanel
kinetic Offline
Member
Registered: 04/06/02
Posts: 156
Loc: Phoenix, Arizona
For one reason or another Section 230 has always given me trouble. I have never fully understood it and am looking for some clarification. I am wiring a detached garage and upgrading an existing 200A service to a 400A all-in-one. One main 200A breaker will supply the main house with the other 200A main supplying a 200A 40/42 space 3R subpanel at the detached garage. The problem I am having is that 42 spaces is not enough. With all the circuits in the garage I am still under on the load calcs but over on the breaker spaces. Can I feed an additional subpanel from my 200A subpanel?
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#163140 - 05/01/07 08:15 PM Re: Subpanel [Re: kinetic]
gfretwell Offline


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Registered: 07/20/04
Posts: 9038
Loc: Estero,Fl,usa
Sure
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#163154 - 05/02/07 03:33 PM Re: Subpanel [Re: kinetic]
Retired_Helper Offline
Member
Registered: 03/13/07
Posts: 165
Loc: Maine
shocked That sounds like one busy garage! Is there going to be a workshop in there?

I speak, of course, from Maine, where many folks live in trailers, situated next to palatial garages. grin
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#163158 - 05/02/07 05:44 PM Re: Subpanel [Re: Retired_Helper]
HotLine1 Offline


Member
Registered: 04/03/02
Posts: 6776
Loc: Brick, NJ USA
Must be one really nice garage!!
Yes, you can add a sub-panel....or two if needed.

John
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#163238 - 05/04/07 02:37 PM Re: Subpanel [Re: kinetic]
Niko Offline
Member
Registered: 08/17/06
Posts: 356
Loc: Campbell, CA
as others have said, yes you can.
can you tell use why or how a garage is using all 42 breakers spaces?
?? confusedJust curious??
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#163243 - 05/04/07 03:54 PM Re: Subpanel [Re: Niko]
Theelectrikid Offline
Member
Registered: 04/30/04
Posts: 810
Loc: Levittown, PA
I want that garage...

...Might have to implode half the section for it though.

Ian A.
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#163250 - 05/04/07 04:55 PM Re: Subpanel [Re: Theelectrikid]
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9038
Loc: Estero,Fl,usa
I am using a pretty big panel in my garage (SqD 20/40) and it is full with a couple tandems and a sub on for the spa.
If you start out with one of those 4 high/2 wide breakers to feed the house the slots start going away fast. I still agree 42 is a lot.
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#163297 - 05/05/07 05:09 PM Re: Subpanel [Re: kinetic]
ShockMe77 Offline
Member
Registered: 06/11/05
Posts: 821
Loc: Rahway, New Jersey
Can he use 310.15 (B)(6) for his garage feeder ampacity? grin
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#163305 - 05/05/07 07:48 PM Re: Subpanel [Re: ShockMe77]
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9038
Loc: Estero,Fl,usa
310.15 (B)(6) can be used if you are going from the garage to the house but not the other way.
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Greg Fretwell
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#163741 - 05/15/07 09:21 PM Re: Subpanel [Re: gfretwell]
kinetic Offline
Member
Registered: 04/06/02
Posts: 156
Loc: Phoenix, Arizona
It is one killer garage. He is a "Need for Speed" guy and moving part of his shop to his house. Everything seems to be small 220V and it really ate up my panel spaces. We put anything and everything you could think of this place. I am envious to say the least.
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