Panel labeling conventions - Home Improvement Stack Exchange Oct 9, 2020 · Panel labeling conventions. I'm in WA state. PoCo is Mason PUD #1. AHJ is WA L&I. I recently had my first inspection after replacing meter box, breaker panel, lots of house wiring. Only flunked for 7 things. One of them was "label panel circuits and mount cover with 2 screws for next inspection". I left the cover off so they could see inside. I ...