Adding a subpanel questions

Old 03-05-21, 12:54 PM
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Adding a subpanel questions

I have been working on adding a subpanel, next to the main panel, in order to have electrical service in the basement, that I'm planning on finishing.

So far, everything seems straight forward. The neutral and ground wires are bonded in the main panel and isolated in the sub-panel. And I'm using 2-2-2-4 aluminum wire, between the two panels, for a 125A circuit.

My question is can I use aluminum wire for the ground wire between the panels? And should I add another grounding rod connected to the subpanel or let the ground piggyback off the main panel?

I apologize if this is a stupid question, I'm simply trying to meet code. Thanks in advance!
Old 03-05-21, 01:51 PM
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You're all set with your wiring layout. No need for another ground rod or extra ground wire as long as the subpanel is in the same building.

2ga AL will support a 100A feed. You can still use a larger subpanel, but the breaker in the main panel can be max 100A.
Old 03-05-21, 02:08 PM
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#2 Al is good for up to 90A, not 100A when used for a branch feeder per the NEC.
Zorfdt voted this post useful.
Old 03-06-21, 04:41 AM
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How many amps do you need?
Old 03-06-21, 12:32 PM
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My question is can I use aluminum wire for the ground wire between the panels?
You said you were using 2-2-2-4 aluminum wire, I assume it is 2-2-2-4 SER cable. If so, the #4 is your ground wire between the two panels.

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