I’m installing a 320A residential service with a meter and (2) 200A service disconnects, feeding (2) 200A subpanels inside the house.
My initial approach is to size the water bonding conductor per NEC 250.102(C) and run the bonding conductor back to each disconnect, similar to how I handle a standard 200A residential service.
However, NEC 250.104(A)(3) references “Buildings or structures supplied by feeders.” That has me second-guessing my approach.
Since the interior panels are being fed from the outdoor disconnects, would this be considered a structure supplied by a feeder? If so, can I size the water bonding conductor based on the feeder (e.g., 4/0 aluminum) instead of sizing it based on the service conductors (which would require 600 kcmil aluminum)?
Also, if this is the case. Can I install the water bond in the sub panels as well?
My initial approach is to size the water bonding conductor per NEC 250.102(C) and run the bonding conductor back to each disconnect, similar to how I handle a standard 200A residential service.
However, NEC 250.104(A)(3) references “Buildings or structures supplied by feeders.” That has me second-guessing my approach.
Since the interior panels are being fed from the outdoor disconnects, would this be considered a structure supplied by a feeder? If so, can I size the water bonding conductor based on the feeder (e.g., 4/0 aluminum) instead of sizing it based on the service conductors (which would require 600 kcmil aluminum)?
Also, if this is the case. Can I install the water bond in the sub panels as well?
