bcslc
Member
- Location
- Salt Lake City, Utah
I'm having some disagreement with some co-workers about the interpretation of 705.12 (D)(2). We had an installer connect a PV system to a 100 amp meter/main, which is protected by a 100 amp main breaker. Using the 120% rule, my call was that the max. size breaker he could use for the PV would be a 20 amp breaker. He has installed a 60 amp breaker. The code states "The sum of the ampere ratings of overcurrent devices in circuits supplying power to a busbar or conductor shall not exceed 120 percent of the rating of the busbar or conductor". My call is that the panel, which is rated at 100 amps, is now being supplied through a 100 amp ocd (from the utility) and a 60 amp ocd (PV), exceeding the 120% rule. I'm being told that I am misinterpreting the requirement.