bbartmasse r
Member
- Location
- Washington State
Ok. So I understand the 120% rule for back feed breakers pretty well. But I have encountered a new situation, which always leads to questions.
We are installing PV to a residence. The residence has a 400 amp panel with integrated meter at the transformer. In this panel, the 400 amp is split and feeds two, 200 amp breakers. One breaker feeds directly to a guest house. The other breaker feeds to a panel in the main house as well as supplying power to a bus with breaker spaces in the original 400 amp panel mentioned above.
The guest house has a 225 amp panel with a 200 amp main breaker, allowing 65 amps of solar input. Remember it is connected to the 200 amp breaker in the original panel by the transformer.
So.......if I feed 60 amps into the panel at the guest house, will I be violating the 120% rule at the 200 amp breaker in the first panel (400 amps with two, 200 amp breakers)
The literature at in the panel does read "200 amps max" which makes me believe this is the buss rating. But I am used to a buss that is connected to other loads, not just one main breaker.
Any suggestions? Let me know if I need to clarify.
thanks
We are installing PV to a residence. The residence has a 400 amp panel with integrated meter at the transformer. In this panel, the 400 amp is split and feeds two, 200 amp breakers. One breaker feeds directly to a guest house. The other breaker feeds to a panel in the main house as well as supplying power to a bus with breaker spaces in the original 400 amp panel mentioned above.
The guest house has a 225 amp panel with a 200 amp main breaker, allowing 65 amps of solar input. Remember it is connected to the 200 amp breaker in the original panel by the transformer.
So.......if I feed 60 amps into the panel at the guest house, will I be violating the 120% rule at the 200 amp breaker in the first panel (400 amps with two, 200 amp breakers)
The literature at in the panel does read "200 amps max" which makes me believe this is the buss rating. But I am used to a buss that is connected to other loads, not just one main breaker.
Any suggestions? Let me know if I need to clarify.
thanks