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When installing a 125amp subpanel panel can i feed it from a

100amp dp breaker ? Barely...
When installing a 125amp subpanel panel can i feed it from a 100amp dp breaker ? Barely gonna use 30amps.
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Answered in 2 minutes by:
8/17/2016
Mike G.
Mike G., Master Electrician
Category: Electrical
Satisfied Customers: 7,939
Experience: Proven Professional 49 years Experience
Verified

Hi, I'm Mike G and I'll be assisting you. Go ahead, no problem as long as the feeder is 100A.

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Customer reply replied 1 year ago
Cool thx

Anytime, you're welcome. Don't forget to rate me.

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Customer reply replied 1 year ago
Ok last but not least, how many 100amp dp breakers to sub panels can i run off a 200amp service panel?

What exactly are you trying to do?

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Customer reply replied 1 year ago
Tryin to figure out if i should run another sub or just add to the one I already have

If you have a 100A sub panel and need another there are other considerations.

How long is the existing feeder?

What size is it?

Is the feeder a 4 wire cable?

Is the new panel to be in the same building?

Just how many additional panels are you needing?

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Customer reply replied 1 year ago
All in the same building. Feeder wire would be bout 5 feet. Panel will be next to the service panel and would be 2 wire.

The feed to the new sub panel needs to be 4 wire. 2 hots, 1 neutral and 1 ground. The wire size is 2,2,4&4 Aluminum. I suggest using a 100A lug kit instead of a breaker if this is off the existing sub panel. The main for one will serve both. You may not be able to use a 100A breaker, check the label on the existing panel.

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Customer reply replied 1 year ago
Why not a 2 wire? Copper.
Customer reply replied 1 year ago
It's off the service panel not the sub

Off the main service panel you'll need a 2 pole 100A breaker in either the main panel or the sub panel being only 5 ft apart. You can use copper but you still need 4 wires per code.

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Customer reply replied 1 year ago
I know. I have all that already

Your follow up question was why not 2 wire. You need 4 wires not 2.

2 hots, 1 neutral and 1 ground.

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Customer reply replied 1 year ago
No. It's a #2 wire. The question was can i have 2 100amp breakers feeding subs off a 200amp service panel

Yes you may. The only limitation is if the label limits the size of any breaker.

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Customer reply replied 1 year ago
You mean the label on the service panel correct?
Customer reply replied 1 year ago
The max is 100a

That means you can install 100A breakers. Number possible is no concern.

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Mike G.
Mike G., Master Electrician
Category: Electrical
Satisfied Customers: 7,939
Experience: Proven Professional 49 years Experience
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Mike G.
Mike G.
Mike G., Master Electrician
Category: Electrical
Satisfied Customers: 7,939
7,939 Satisfied Customers
Experience: Proven Professional 49 years Experience

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