royboy75
Member
- Location
- Kernersville NC USA
Recently had a PV install that the AHJ wanted us to remove the bonding screw in the fused disconnect after we had tapped in the MDP. Every other AHJ that we had dealt with wants the bonding screw in the disconnect. Basically, we had tapped before the main breaker in the MDP and then brought the conductors to a fused disconnect. The disconnect had the neutrals together and the grounds landing on the ground bar. He said by having the bonding screw in then basically the neutrals and the grounds were together and if there was a fault, there would only be one path instead of two. Since it was a PV install, leaving the bonding screw out had to be done. Since this was not a service disconnect and not the first point of disconnect, the bonding screw did not need to be installed. Is this correct? If anybody has some clarification, it would be appreciated.
Order of wiring from the PV side:
Conductors from the roof hitting a string inverter and then going to a summary panel where two other strings are there from an existing micro-inverter job. Backfeeding roughly 60a. From summary panel, goes to a fused disconnect. There is a ground and a neutral entering the disconnect and leaving the disconnect to the MDP. Then the L1 and the L2 conductors are tapped and the neutral and the ground wire is landed on the neutral bar since they are combined, being the first point of disconnect.
Any question, please ask!
Order of wiring from the PV side:
Conductors from the roof hitting a string inverter and then going to a summary panel where two other strings are there from an existing micro-inverter job. Backfeeding roughly 60a. From summary panel, goes to a fused disconnect. There is a ground and a neutral entering the disconnect and leaving the disconnect to the MDP. Then the L1 and the L2 conductors are tapped and the neutral and the ground wire is landed on the neutral bar since they are combined, being the first point of disconnect.
Any question, please ask!