Horst
Member
- Location
- Valrico, FL
I am working in a new jurisdiction and the inspector says this configuration is not code compliant (built to the engineers spec). This is a 400A CT service, the 2 parallel runs of 3 phase 4/0 AL come through the CT cabinet into a wire way and into 4 port polaris'. from the wireway there are 2 disconnects, 1 single phase, 1 three phase (both 200A NON FUSED) of course each of the phases are into the polaris, except "C" phase for the single phase panel is not used. (120/208v). This is on the exterior of the building. Directly behind each of the disconnects is a 200A panel (1 single, 1 three phase) and each has a 200A MB. His beef is that the "C" phase leg, only feeding the 3 phase panel is too small, since it is expected to carry up to 400A prior to the 200A OCP of the breaker. So, being the smart *** that I am, I asked if I could then simply install a 500 KCmil CU from the polaris to the lug on the 200A breaker in the 3 phase panel. He didn't buy that. He says the only solution is to fuse the disconnect outside. Am I missing something here? Thanks.
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