I've got some outdoor conduit within which are three separate branch circuits:
- A general purpose, 20A outdoor receptacle circuit
- A 15A HVAC circuit
- A 40A EVSE circuit
I am using NM-B for each circuit on the indoor segment that connects the breaker to the conduit, at which point I transition to THWN. The NM-B has a ground wire included, and I know that I only need to ground the conduit to the 8AWG wire from the EVSE circuit. My question is, should I not connect the ground wires on the 15A and 20A circuits to avoid creating a ground loop, or does it not matter?