Okay, I'm puzzled. I've got two electrical inspectors saying it is legal to run just three wires (single-phase 120/240 service) from a "main panel" to a "sub-panel" at a different location. I thought we ALWAYS have to run that fourth (grounding) conductor.
Both inspectors say that as long as the sub-panel has a main breaker and two ground rods it's okay to just run two phase conductors and one grounded conductor - just don't bond the panel with that "little green screw" - that would be the main bonding jumper.
I understand isolating ground fault, but I still can't find where such a set-up is legal by NEC standards. Am I losing my mind?
Both inspectors say that as long as the sub-panel has a main breaker and two ground rods it's okay to just run two phase conductors and one grounded conductor - just don't bond the panel with that "little green screw" - that would be the main bonding jumper.
I understand isolating ground fault, but I still can't find where such a set-up is legal by NEC standards. Am I losing my mind?