Hello All,
I am currently working on a project where 2 inverters will be combined and interconnected with a supply side tap. The sum of the inverter OCPDs are 100A using 2 breakers, (1) 40A and (1) 60A. The bus bar rating of the combiner is 100A, MLO with a 100A fusable disconnect ahead protecting it. All of this will be mounted outside on a backboard adjacent to the utility meter.
There is additional production metering equipment that requires a 15A reference breaker to be installed somewhere on the circuit. My original plan was to install the reference breaker in the PV combiner which would result in 115A of breakers on a 100A busbar which would violate 705.12 (D)(2)(3)(c). My question is, do I have to comply with 705.12 (D)(2)(3)(c) since I am interconnecting on the supply side and (705.12 (A)) "the sum of of the ratings of the inverter AC inverter OCPDs do not exceed the ratings of the utility service (200A)", and the bus bar of the combiner is still being protected at 100A by the fusable diso. As I understand 705.12 I must comply with one of either (A) (B) (C) or (D).
Originally I thought to upsize the combiner to a 125A bus, which I'm told will be physically larger and we are space limited.
Thank you all!
I am currently working on a project where 2 inverters will be combined and interconnected with a supply side tap. The sum of the inverter OCPDs are 100A using 2 breakers, (1) 40A and (1) 60A. The bus bar rating of the combiner is 100A, MLO with a 100A fusable disconnect ahead protecting it. All of this will be mounted outside on a backboard adjacent to the utility meter.
There is additional production metering equipment that requires a 15A reference breaker to be installed somewhere on the circuit. My original plan was to install the reference breaker in the PV combiner which would result in 115A of breakers on a 100A busbar which would violate 705.12 (D)(2)(3)(c). My question is, do I have to comply with 705.12 (D)(2)(3)(c) since I am interconnecting on the supply side and (705.12 (A)) "the sum of of the ratings of the inverter AC inverter OCPDs do not exceed the ratings of the utility service (200A)", and the bus bar of the combiner is still being protected at 100A by the fusable diso. As I understand 705.12 I must comply with one of either (A) (B) (C) or (D).
Originally I thought to upsize the combiner to a 125A bus, which I'm told will be physically larger and we are space limited.
Thank you all!