- Electrical Contractor, Electrical Engineer
"Not a common", so that means you have seen it happen then?.Me too. Irrigation wells around here typically have 480 volt control circuit and this is not a common occurrence. I have seen it happen more frequently, even at lower voltages, when indoor equipment was being used outdoors.
NEMA 1 might be the real issue back then. Remember, rural sawmills were open sides with roofs. So when the fog rolls in here in the east, everything is dripping wet.