Redskinsdb21
Mining
So, we are designing a 480/277 switchboard. I want to feed a 480/277 lighting panel with one breaker from the switchboard for lighting in the building. This is ok right?
Then, I want to power the lighting circuits @ 277 V from lighting panel. Is 277 the line-to-neutral voltage in this case?
If so, to feed a lighting circuit in one room, I would just need a 1-pole breaker inside a 42-circuit panel? If I wanted to use 480 to feed something else from the panel I would need a 2-pole breaker and use 2 circuits in the 42-circuit panel?
Also, the cable from the switchboard to panel would need to be 4-wire, 3 for the 3 phases and 1 for neutral? Or would a 5 wire be required to include a ground?
Then, I want to power the lighting circuits @ 277 V from lighting panel. Is 277 the line-to-neutral voltage in this case?
If so, to feed a lighting circuit in one room, I would just need a 1-pole breaker inside a 42-circuit panel? If I wanted to use 480 to feed something else from the panel I would need a 2-pole breaker and use 2 circuits in the 42-circuit panel?
Also, the cable from the switchboard to panel would need to be 4-wire, 3 for the 3 phases and 1 for neutral? Or would a 5 wire be required to include a ground?