Anode
Member
- Location
- Washington, USA
I got a phone call from a plan reviewer recently, who was asking where the over current protection was, at the source, on our Solectria 28kW inverter. The call came after they had approved our plans, but this person was I guess just curious or second guessing their approval.
They pointed to NEC 2014 690.9 (A) and where I see the confusing exists in the last sentence highlighted in that paragraph, where it says, "shall be protected at the source from overcurrent."
I explained that I've got a ac/dc disconnect on that inverter, CCC's coming off the inverter sized appropriately, OCPD's in the panel board collecting the inverter output circuits, and a main pv disconnect after that, all sized for over current protection. Yet, he still insisted that the code wants protection at the source.
For something that seems so automatic for me, I was struggling to properly clarify his question. Some alternate interpretations here would be great.
They pointed to NEC 2014 690.9 (A) and where I see the confusing exists in the last sentence highlighted in that paragraph, where it says, "shall be protected at the source from overcurrent."
I explained that I've got a ac/dc disconnect on that inverter, CCC's coming off the inverter sized appropriately, OCPD's in the panel board collecting the inverter output circuits, and a main pv disconnect after that, all sized for over current protection. Yet, he still insisted that the code wants protection at the source.
For something that seems so automatic for me, I was struggling to properly clarify his question. Some alternate interpretations here would be great.