PWDickerson
Senior Member
- Location
- Clinton, WA
- Occupation
- Solar Contractor
The vast majority of our jobs are residential 1 to 4 string installations. We typically install a junction box on the roof under a module, run the PV wire to the junction box, transition to THWN-2 using a terminal block, and run the THWN-2 from the j-box down to the inverter. We have been using the same high quality terminal block for years, and it works great. The terminal block is "UL Recognized" and CSA certified (no US or C/US), but not "UL Listed". We recently got a correction from an electrical inspector because the terminal blocks are only UL Recognized instead of UL Listed. I started looking into other products we could use instead, and it looks like most, if not all, terminal blocks are only UL Recognized.
How are others transitioning from PV wire to THWN-2?
How are others transitioning from PV wire to THWN-2?