Load side tap in main panel at feed thru lugs.

[Mavipo0221]

Good afternoon everyone

I recently failed a solar install that stating it isn't compliant with 705.12(B)(2)(3)

The contractor is telling me that his 60 amp fused disconnect, that's load side tapped in the 150amp bus rated, 150 amp main breaker, main panel is code compliant because of 705.12(B)(2)(1)(b) and due to putting in a 150 main in the sub panel, that is fed from the feed thru lugs.

Thoughts?

 

[wwhitney]

A one-line diagram would be helpful, as would the inverter output current rating. But as a general comment, with a feeder interconnection, the feeder has to comply with (2017) 705.12(B)(2)(1), and the main panel still has to comply with 705.12(B)(2)(3). Every piece of equipment with multiple supply connections has to comply with 705.12(B).

Cheers, Wayne

 

[Mavipo0221]

At 125% the solar inverter is at 49.5 amps. My understanding is (B)(2)(1)(b) and (B)(2)(3) are individual codes and you have to comply with both in this situation

 

[jaggedben]

At 125% the solar inverter is at 49.5 amps. My understanding is (B)(2)(1)(b) and (B)(2)(3) are individual codes and you have to comply with both in this situation

I agree. It's not completely clear from your description that the main panel can't comply with (B)(2)(3)(c) but it has comply with (B)(2)(3) somehow.