Existing building has 400 Amp service with one MBP. This service is now being replaced with a new 1200 Amp service. All 3 phase 480/277V. Customer is very cost driven and wants to reuse the max amount.
An Eaton Pow-R-Line C Switchboard (NEMA type 3R) with outgoing feeds will be specified to serve:
What is the best breaker choice for the 400A feed using the existing 500 kcmil run and how to specify??
Can it be 2 parallel 200A breakers supplied from manf. I am aware of NEC 240.8 that states:
An Eaton Pow-R-Line C Switchboard (NEMA type 3R) with outgoing feeds will be specified to serve:
- One 400A feed going to existing MBP connected using existing 500 kcmil and conduit
- Four 200A feeds each to a new 200A panel using 4/0 Al
What is the best breaker choice for the 400A feed using the existing 500 kcmil run and how to specify??
Can it be 2 parallel 200A breakers supplied from manf. I am aware of NEC 240.8 that states:
240.8 Fuses or Circuit Breakers in Parallel. Fuses and circuit breakers shall be permitted to be connected in parallel where they are factory assembled in parallel and listed as a unit. Individual fuses, circuit breakers, or combinations thereof shall not otherwise be connected in parallel.
I would like to have 6 200A breakers but how do I specify that any two of them are able to be paralleled to comply with NEC 240.8??? If that is possible then what is least expensive way to split the 500 kcmil (a 4/0 from each breaker going to a J-box with lug strips to y connect to the 500 kcmil??).