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View Full Version : 200 amp main to a 100 amp sub panel.


ibkorthy
Oct 19, 2011, 08:05 AM
I have a 200 amp main in the garage that is completely full. I want to add a 100 amp sub panel right next to it,(a few feet away) so I can add some wiring to the attic and basement. What size cable is required to connect the 200 to the 100 sub indoors just a few feet away?

tkrussell
Oct 19, 2011, 08:20 AM
You may use either #3 copper THHN or #1 aluminum XHHW .

ibkorthy
Oct 21, 2011, 05:18 AM
Is it OK if I already bought 2224?

tkrussell
Oct 21, 2011, 06:13 AM
I will assume the #2 is aluminum, which you may use only if you protect it with a 90 Amp breaker.

Would have been good to mention that in your original question.

ibkorthy
Oct 21, 2011, 10:00 AM
I didn't buy it until my question went unanswered for 2 days, The electrical guy at Home depot said 2 2 2 4 would be the way to go. 100amp breaker. I'm only running 2-15amp and 1-20amp circuits from it. I have an electrician friend coming to install it so if he says its not right I will toss it. I only needed 6 feet of it. He is out of state hunting and I can't get in touch with him until sat. Was hoping to have everything here ready to go for him. Thanks for the reply. Much appreciated.

tkrussell
Oct 21, 2011, 01:09 PM
Clerks in stores should not be giving advice unless they have a license for that trade. And he is incorrect on the 100 Amp breaker on this feeder with #2 Al to a subpanel.


What I see for date/time stamps is you posted a question on 10/19/11 at 11:05 AM and me answering the same day at 11:20 AM. Is that what you see?

Since you have an electrician installing the feeder, any liability or code violations will fall under his license.