Can two different circuits go through the same junction box? That is, two cables enter from different breakers and they tie to cables exiting, but the two circuits aren't connected except for the grounds if that is required.
Electrical – Two circuits in same junction box
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Best Answer
Yes, that is fine. The only restriction would be mixing voltage classes. You couldn’t mix line voltage and low voltage (e.g. 12 volts) in the same box.
You can interconnect the grounds or not. If the box is metal and the conduit is not (or no conduit), you’ll need to tie one or both grounds to the box.
Be careful not to mix or interconnect the neutrals or hots.