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Joined: Apr 2002
Posts: 156
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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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Joined: Jul 2004
Posts: 9,796 Likes: 15
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Greg Fretwell
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Joined: Mar 2007
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 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. 
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Joined: Apr 2002
Posts: 7,336 Likes: 7
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Must be one really nice garage!!
Yes, you can add a sub-panel....or two if needed.
John
John
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Joined: Aug 2006
Posts: 356
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as others have said, yes you can. can you tell use why or how a garage is using all 42 breakers spaces? ??  Just curious??
Be kind to your neighbor, he knows where you live
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Joined: Apr 2004
Posts: 812
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I want that garage...
...Might have to implode half the section for it though.
Ian A.
Is there anyone on board who knows how to fly a plane?
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Joined: Jul 2004
Posts: 9,796 Likes: 15
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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.
Greg Fretwell
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Joined: Jun 2005
Posts: 821
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Can he use 310.15 (B)(6) for his garage feeder ampacity?
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Joined: Jul 2004
Posts: 9,796 Likes: 15
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310.15 (B)(6) can be used if you are going from the garage to the house but not the other way.
Greg Fretwell
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Joined: Apr 2002
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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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Posts: 46
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