The_Archer
Member
- Location
- New York
Recently I have been getting conflicting information from solar professionals and inspectors: Here is a scenario 1: AC side: two solar inverters wired up to a load center, from the load center to a fused service rated disconnect. In the load center grounds and neutral are isolated ( no bond screw) in the svc rated disc the grounds and neutral are joined together and bonded, from the svc disc to to a tap in the main service panel, the EGC from PV array is then crimped to the GEC. Is there a scenario where you isolate grounds and neutrals in both the load center and the svc rated disconnect? also, in scenario 1, if the EGC from the array passes through the load center and AC svc disc and is split bolted to the two pieces of equipment, do you still need to carry a separate ground to the msp with you tap feeders? IE: 6/3 Romex from the line side of the svc disc to the tap, the ground with the Romex is redundant if the EGC is crimped to the GEC inside the MSP, what of the EGC is crimped outside the panel or landed on a water clamp to water main? The Soares book on grounding has a great illustration showing 3w vs 4w, separately derived vs not separately derived. This illustration confuses me a little, I guess the main question is what is the distinction with separately derived vs not separately derived with regards to grounds and neutrals, first point of disconnect, bonding etc.