Panel feeders

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tabuffy

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Willow Street, PA 17584
A customer asked us to give an alternative price for running his 3 phase 120/208 feeder conductors in aluminum. Feeders are coming out of a 200 amp breaker on a gangable meter compartment to a 225 amp main lug panel. Are we able to use 4/0 aluminum XHHW if the lugs are rated for 90 degree? are we allowed to round up to the next over current device?
:?
 
tabuffy said:
A customer asked us to give an alternative price for running his 3 phase 120/208 feeder conductors in aluminum. Feeders are coming out of a 200 amp breaker on a gangable meter compartment to a 225 amp main lug panel. Are we able to use 4/0 aluminum XHHW if the lugs are rated for 90 degree? are we allowed to round up to the next over current device?
:?
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You must use the 75 degree column as your equipment will be rated for 75 degree max termination. You could, however, use the next size up rule the 4/0 AL would be OK IF the calculated load does not exceed 180 amps. Thats a big if in many AHJs eyes, especially if you don't have the data to back it up.
 
texie said:
You must use the 75 degree column as your equipment will be rated for 75 degree max termination. You could, however, use the next size up rule the 4/0 AL would be OK IF the calculated load does not exceed 180 amps. Thats a big if in many AHJs eyes, especially if you don't have the data to back it up.
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I agree with Texie. I'd bring your load calc sheet with you for inspection if you go with the 4/0, just in case.
 
tabuffy said:
Thanks. Was hoping to find some cost savings with Al conductors but will not be very effective if I have to go up to #250 MCM.
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Wouldn't the larger size aluminum conductors still be about 1/2 the cost of smaller copper conductors?
 
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