YoungElectricalEng
Member
- Location
- Niagara Falls, Ontario, Canada
I have a 600V MCC Section that is fed from an 800A MCB in a 600V Switchboard. Let's call the existing 600V MCC Section 'MCC1'. MCC1 has an 800A Non-Fusible disconnect to isolate the MCC section from the 600V Switchboard. MCC1 was built with a second 800A Non-Fusible disconnect, connected to the horizontal bus downstream from the incoming Main 800A disconnect. The second 800A disconnect was installed in the event we wanted to connect PFC. The max load on MCC1 is 270A and the MCC section has no room for spares. I have a NEW 600V MCC Section (MCC2) being installed beside MCC1. MCC2 has an 800A Breaker (adjustable). The max load on MCC2 will be 290A and MCC2 has no room for spares. I want to feed MCC2 from the spare 800A disconnect in MCC1. Combined load would be 560A. QUESTION: Does the branch circuit feeder from MCC1 to MCC2 require it's own protection, or is this branch circuit feeder considered protected by the 800A MCB in the Switchboard? Thanks in advance.