Mixing wire gauges/circuits in same box


Old 06-26-14, 03:16 PM
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Mixing wire gauges/circuits in same box

I have a junction box in the basement that contains wires from 3 circuits. a 15a,20a and a 30a. Is it bad practice to have mixed gauges (or multiple circuits for that matter) in the same junction box?

Last edited by pcboss; 06-26-14 at 03:44 PM.
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Old 06-26-14, 03:52 PM
Tolyn Ironhand's Avatar
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Nope. It is done all the time and is A-OK. In commercial jobs we have installed j-boxes, and seen others installed, that have 30+ circuits in them.
Old 06-26-14, 03:52 PM
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Mixed circuits are fine in the same junction box. All the grounds need to be spliced together.
Old 06-26-14, 11:39 PM
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Not a problem. Just yesterday I had a J-Box with 4/0 Aluminum on a 200A breaker all the way down to #12 copper on a 20A breaker all in 1 box.

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