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#40424 - 07/19/04 09:23 PM Twin breakers or Sub-panel?
aldav53 Offline
Member

Registered: 08/22/01
Posts: 547
Loc: Chandler, AZ USA
The 200 amp SQ-D panel I'm working with in a home is full. I need to add about 5-120v circuits and 2-240v out to a new attached garage. I could pull the singles and add twins but some inspectors don't like a lot of twin breakers. I will add a 100 amp sub-panel in the garage feeding it with a 100a breaker (which I'll have to add 4 twins to make room) but think this will be better. Also, will adding the 100a panel be a problem with loading the 200a panel?
Thanks for any input.
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#40425 - 07/19/04 09:40 PM Re: Twin breakers or Sub-panel?
caselec Offline
Member

Registered: 04/14/02
Posts: 557
Loc: San Jose, CA
Is this loadcenter listed for twin breakers? If so the inspector shouldn't have a problem with it.

The only way to determine if the 200 amp loadcenter can take the additional load is to do load calcs.
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#40426 - 07/19/04 09:50 PM Re: Twin breakers or Sub-panel?
aldav53 Offline
Member

Registered: 08/22/01
Posts: 547
Loc: Chandler, AZ USA
Don't think there is a listing. There are twins that will fit in the panel. I will do a load calc and check the amp draw under normal usage too.
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#40427 - 07/19/04 10:00 PM Re: Twin breakers or Sub-panel?
caselec Offline
Member

Registered: 04/14/02
Posts: 557
Loc: San Jose, CA
There should be a label on the inside of the box that shows what type of breakers can be used in each position. Do you have the catalog number of the loadcenter?
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#40428 - 07/20/04 04:35 AM Re: Twin breakers or Sub-panel?
Electric Eagle Offline
Member

Registered: 04/20/02
Posts: 928
Loc: Alpharetta, GA
Just because they make tandem breakers that fit doesn't mean you should use them. One sure way to tell is if there will be more than 42 (40 in most) poles/breakers, then the panel is not meant to have tandems. You may have a 30/40 panel that can have 10 tandems, but it sounds like you may run over that. You may need to add the sub panel in the garage and another sub next to the main panel.

I have argued on this board that the 42 circuit limit is ridiculous and 1 or 2 tandems should be allowed, but you sound like you need a lot more than 1 or 2. Also, it may be a code violation, depending on your panel.

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#40429 - 07/20/04 06:16 AM Re: Twin breakers or Sub-panel?
earlydean Offline
Member

Registered: 12/22/03
Posts: 749
Loc: Griswold, CT, USA
Not only is there the 42 NEC limit, but each panel has a limit. Look at the fine print inside the can.
If your 200 amp panel already has 42 full spaces, then your other alternative is to do a load study of each branch circuit, and combine those that you can.
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#40430 - 07/20/04 08:05 AM Re: Twin breakers or Sub-panel?
aldav53 Offline
Member

Registered: 08/22/01
Posts: 547
Loc: Chandler, AZ USA
Electric Eagle,
What would the extra sub-panel next to the main panel be for? A disconnect beaker? I would need a way to tap the buss.
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#40431 - 07/20/04 11:29 AM Re: Twin breakers or Sub-panel?
SolarPowered Offline
Member

Registered: 07/05/04
Posts: 615
Loc: Palo Alto, CA, USA
The subpanel next to the main panel is for the circuits that are displaced for the feeder connections. If the main panel is full, you need to move four poles to the subpanel, freeing four poles in the main panel. Then, two of those poles feed the new subpanel, and the other two feed the remote subpanel with all the new circuits.

You can, of course, also put some of the new circuits on the subpanel next to the main panel.

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#40432 - 07/20/04 11:53 AM Re: Twin breakers or Sub-panel?
aldav53 Offline
Member

Registered: 08/22/01
Posts: 547
Loc: Chandler, AZ USA
SolarPowered, Got it, that makes sense.
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#40433 - 07/20/04 06:06 PM Re: Twin breakers or Sub-panel?
aldav53 Offline
Member

Registered: 08/22/01
Posts: 547
Loc: Chandler, AZ USA
If you are not allowed to add twins to a 42 circuit panel, then why could you add a sub-panel?
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