Running into an issue with the AHJ over a pre-existing UG feed in PVC. Our customer has a barn with a 60A sub panel with a 6/2 UG wire feed through 100 feet of 1 1/2" PVC conduit back to the house main (40A breaker), sub panel has neutral/ground bond. Our design is to remove the 6/2 UG wire from the conduit and run 4 XHHW-2 6 AWG aluminum cable feed from the main panel to the sub panel in the barn, remove the bond in the sub panel, and add a GEC at the barn. Sounds reasonable right? AHJ agreed to this part of the solution.
The new 4.6 Kw PV system will be a 12 panel array with Enphase micros split into 2 strings. This requires 4 more 12G copper XHHW-2 wires for the 2 strings, plus an additional 12G copper XHHW-2 wire for the PV system ground. So in total, the 1 1/2" conduit will have four 6 AWG and five 12 AWG wires. There will be a junction box on the exterior of the house where the wiring will be separated, solar to the Enphase combiner and the 4 #6 wires into the house to the main for the barn power. The junction box will have continuous feeds, this is only to separate the 2 sources appropratly.
We have done similar configurations in the same jurisdiction in the past without any issues, however the new AHJ is refusing to sign off on this citing that 2 different power sources cannot be enclosed in the same PVC. I can't find anything in our code saying this is not allowed. Homeowner does not want to dig up the sod for an additional PVC run. Is there something in the NEC I am mising? The AHJ isn't providing any specific code that does not allow this.
The new 4.6 Kw PV system will be a 12 panel array with Enphase micros split into 2 strings. This requires 4 more 12G copper XHHW-2 wires for the 2 strings, plus an additional 12G copper XHHW-2 wire for the PV system ground. So in total, the 1 1/2" conduit will have four 6 AWG and five 12 AWG wires. There will be a junction box on the exterior of the house where the wiring will be separated, solar to the Enphase combiner and the 4 #6 wires into the house to the main for the barn power. The junction box will have continuous feeds, this is only to separate the 2 sources appropratly.
We have done similar configurations in the same jurisdiction in the past without any issues, however the new AHJ is refusing to sign off on this citing that 2 different power sources cannot be enclosed in the same PVC. I can't find anything in our code saying this is not allowed. Homeowner does not want to dig up the sod for an additional PVC run. Is there something in the NEC I am mising? The AHJ isn't providing any specific code that does not allow this.