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I am currently working on a projest where we have removed the old overhead service to a 1907 school building. The service is now refed from the adjacent newer building underground to a distribution panel which is also being used to feed a new elevator system in the old building. The distribution panel is 120/208 3 pahse and has a 300 amp breaker to refeed the building service. Due to voltage difference a 208 to 120/240 volt isolation transformer is fed from the 300 amp breaker and then the transformer refeeds the old panel. Load study shows a 44 kva load.The engineer
originally had 350 mcm on the primary and then came off seconday with 500 mcm to the original service panels 400 amp breaker.When we questioned it he then changed it to 600 mcm!! We only questioned it because we felt the wire was too big not to small. Anyone know the reasoning behind this? I really am gonna have a tough time terminating these 600 mcm wires to a 50 kva transformer. not of course impossible but very challenging nevertheless.
originally had 350 mcm on the primary and then came off seconday with 500 mcm to the original service panels 400 amp breaker.When we questioned it he then changed it to 600 mcm!! We only questioned it because we felt the wire was too big not to small. Anyone know the reasoning behind this? I really am gonna have a tough time terminating these 600 mcm wires to a 50 kva transformer. not of course impossible but very challenging nevertheless.