RogueElectron
Member
- Location
- United States
- Occupation
- Architect
I have a situation where I need to squeeze in a 400 Amp meter main and disconnect for a service upgrade (underground entry) in accordance with NEC 2020 in California. The issue is that the existing 200 Amp service is still serviceable, while the space available for surface mount of a 400 MM, given the space between the existing box and the fence and the existing box and the front of the residence is such that a 24" combo main will fit, but not a 34-36" combo main. All of the combo meter mains that I have found, except a couple, are NEC 2017 boxes with non insulated line terminals (230.62(C) Barriers). Are their insulative covers available for boxes like this:
Milbank U3251-O-200-CB
If insulators aren't available, then the next plan would be to use a meter main and a separate disconnect, then run line to the existing panel. It won't look quite as clean, though. I'm also concerned that the AHJ might not like having a disconnect at the meter, and then another disconnect as the main breaker in the existing panel, since they are supposed to be "grouped." I estimate the distance between the two installed disconnects at about 20".
Milbank U3251-O-200-CB
If insulators aren't available, then the next plan would be to use a meter main and a separate disconnect, then run line to the existing panel. It won't look quite as clean, though. I'm also concerned that the AHJ might not like having a disconnect at the meter, and then another disconnect as the main breaker in the existing panel, since they are supposed to be "grouped." I estimate the distance between the two installed disconnects at about 20".