LADWP is requiring inverters to apply for articles of certification though their engineers. Several transformerless inverters are approved, others have not supplied the required schematics. I wouldnt worry about the over the counter for LADBS. The plan check is not routine enough for these systems to be over the counter yet. Once they become routine, and the engineers understand the code enough, they will develop a check list, and by and by train the inspectors enough to switch to express permits.
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