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#39235 - 06/15/04 05:26 AM Home addition sub panel
tonyc Offline
Member
Registered: 09/27/02
Posts: 18
Loc: Chesapeake, Va
Doing the electrical for a friend on his 1000 sq ft addition. Main part of the house has an existing 10 yr old 200 amp panel that is full. I was going to put a sub panel in the new addition utility room and either back feed it or just get a panel with a 100 amp main. Can I use a 100 amp breaker in the existing panel and feed the new sub panel with a 100 amp breaker or does this violate the tap rules its about a 50-75 ft run from panel to panel ?
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#39236 - 06/15/04 06:15 AM Re: Home addition sub panel
Roger Offline
Member
Registered: 05/18/02
Posts: 1716
Loc: N.C.
Tony, no offense intended, but can you legally permit this work not being a licensed EC?

Roger
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#39237 - 06/15/04 06:41 AM Re: Home addition sub panel
tonyc Offline
Member
Registered: 09/27/02
Posts: 18
Loc: Chesapeake, Va
I guess today is just not my day. I do have a license two as a matter of fact.

N.C 14766-L since 1988
Va. 2705078514

look em up just renewed

And I let my HVAC go because it was too much headache.

I am a Project manager on Computer networks now so my Electrical knowledge may not be what it used to be. So can I do my friends a favor or do I need to call a contractor. Little bit of adevrtising for your site in Electrical contractor and now we can't even ask a question. It's all good
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#39238 - 06/15/04 10:14 AM Re: Home addition sub panel
Roger Offline
Member
Registered: 05/18/02
Posts: 1716
Loc: N.C.
Tony, certainly you can ask questions.

I asked you one and you answered.

Here's another one do you have or can you access a current copy of the NEC?

As far as your original question, yes, you can feed this new panel from a 100 amp breaker and there is no limit for length of a feeder which is what you would have in this case. (not a tap)

Has anyone calculated how this additional load is going to impact the existing service?

Roger
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#39239 - 06/15/04 11:57 AM Re: Home addition sub panel
Radar Offline
Member
Registered: 04/30/04
Posts: 349
Loc: Los Angeles, CA
Tony, If you utilize a 2P 100A breaker in the main panel to feed the sub panel, that's not really a tap, just a feeder circuit. You don't necessarily need a main CB in the sub panel, but it might bu useful for local isolation.

Two things to make sure of:
1. Use adequately sized feeder wire.
2. As noted above, someone should do a load calc on the entire electrical service and distribution system.

I presume your friend is getting a permit for the addition? Did he get the electrical permit also? Most building authorities will want to see this info too.

Radar
_________________________
There are 10 types of people. Those who know binary, and those who don't.
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#39240 - 06/15/04 12:24 PM Re: Home addition sub panel
tonyc Offline
Member
Registered: 09/27/02
Posts: 18
Loc: Chesapeake, Va
Yes they have a permit, I am already thinking it may be more than I can handle they are wanting to move the dryer onto this new panel 1.5 ton ac plus various 110vac circuits they may wind up with a 200amp feed thru at the rate things are going I really don't have the time to do it.
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#39241 - 06/16/04 09:50 AM Re: Home addition sub panel
classicsat Offline
Member
Registered: 11/23/02
Posts: 456
I might have the A/C on the main, and move some existing 110 circuits to the sub.
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