R Rodolfo New member Mar 1, 2011 #1 ...main circuit breakker is 400 A? The main circuit breakker is 400 amp. Maybe it is 3 phase 4wire system. Why not use of 750mcm cables?
...main circuit breakker is 400 A? The main circuit breakker is 400 amp. Maybe it is 3 phase 4wire system. Why not use of 750mcm cables?
