Is their a code requirement on the number of separate branch circuits in a single double gang junction box. I'm bringing two SEPARATE independent circuits to a single junction box. They are not connected together.
One 14/3 connects to a smoke alarm and the second 12/2 connects to an outlet. They are on two separate breakers.
Do they need to be in two separate junction boxes or may all the connections be made within a single box. If single box OK do the bare grounds from both circuits get connected together or do they remain separate as well? It's a metal box.