We have to run underground 11 sets of 4 #500KCM from transformer to 480 switchgear (3750 amps). Can we parallel the same phase WITH more than 3 conductors IN A CONDUIT without derating?
The problem we have is defending the need to derate. Our client says we should NOT have to derate.
He gives us the example of 2 #1000 KCM IN PARALLEL(same phase), you do not derate OR 4 #600 KCM IN PARALLEL (SAME PHASE),which has the same amperage (AS 2 #1000 KCM) and thus heating is the same and no derating required.
Which is right? DO WE DERATE OR NOT?
[ May 14, 2003, 09:28 PM: Message edited by: bigfish92 ]
The problem we have is defending the need to derate. Our client says we should NOT have to derate.
He gives us the example of 2 #1000 KCM IN PARALLEL(same phase), you do not derate OR 4 #600 KCM IN PARALLEL (SAME PHASE),which has the same amperage (AS 2 #1000 KCM) and thus heating is the same and no derating required.
Which is right? DO WE DERATE OR NOT?
[ May 14, 2003, 09:28 PM: Message edited by: bigfish92 ]