OK...
We are wiring a 1200 amp service in a RESIDENTIAL single family dwelling.
We are planning on running 3 sets in parrell and we ending up in a great debate...
According to 240.40(C) the wiring being protected by our 1200 amp breaker "...shall be equal to or greater than the rating of the overcurrent device defined in 240.6"
Which tell us we need to run 3 sets of 600 kcmill for the load of a 1200 amp breaker. The counter argument giving to us was in 310.15(B)(6) which points us to the table 310.15(B)(6) saying that 400 kcmill can feed 400 amps which gave the interpretation of 3 sets of 400 kcmill = 1200 amp
which is correct or are we both wrong?
We are wiring a 1200 amp service in a RESIDENTIAL single family dwelling.
We are planning on running 3 sets in parrell and we ending up in a great debate...
According to 240.40(C) the wiring being protected by our 1200 amp breaker "...shall be equal to or greater than the rating of the overcurrent device defined in 240.6"
Which tell us we need to run 3 sets of 600 kcmill for the load of a 1200 amp breaker. The counter argument giving to us was in 310.15(B)(6) which points us to the table 310.15(B)(6) saying that 400 kcmill can feed 400 amps which gave the interpretation of 3 sets of 400 kcmill = 1200 amp
which is correct or are we both wrong?