ggunn
PE (Electrical), NABCEP certified
- Location
- Austin, TX, USA
- Occupation
- Consulting Electrical Engineer - Photovoltaic Systems
OK, so under the 2014 NEC we can finally have legit AC combiner panels under 705.12(D)(2)(3)(c), which says the bus rating must be greater than or equal to the total of all the breaker ratings in the panel, both supply and load, disregarding the breaker that connects the panel to the service. Groovy.
But... I have an AC combiner that combines three single phase inverters into a three phase service - 60A AB, 30A BC, and 60A CA. By the letter of the code my panel busbars must be rated at least 150A, but the most that hits any one bus is 120A, so doesn't it make sense that I should be able to use a 125A panel?
But... I have an AC combiner that combines three single phase inverters into a three phase service - 60A AB, 30A BC, and 60A CA. By the letter of the code my panel busbars must be rated at least 150A, but the most that hits any one bus is 120A, so doesn't it make sense that I should be able to use a 125A panel?