I have a wall switch box that will have 2 circuits in it:
1) A pass-through circuit with just a junction between incoming and outgoing wires; and
2) A light switch at the tail end of a separate circuit.
I have attached Circuit #2's bonding wire to the box because it is the circuit that is powering the switch.
a) Do I need to also attach Circuit #1's bonding wire to the box? Circuit #1 is just passing through the box (with a junction inside the box).
b) Do I need to make sure that both circuits are on the same phase? Or is it okay for them to be opposite phases?