mshields
Senior Member
- Location
- Boston, MA
I have a single existing 4 inch conduit that I'd like to use for a 500A feeder (I want to avoid adding a parallel conduit). It appears to me that I can do this with 2 sets of 400kcmil compact copper conductors.
Given that I'll have 8 current carrying conductors, I'll derate to 70% which gives me a total ampacity (2 conductors) of 468A which allows me to use a 500A breaker.
Couple of questions:
1. I wouldn't ordinarily provide parallel conductors in the same conduit. Other than having to worry about derating, is there any code rule not permitting it.
2. I know they make compact Aluminum. Do they in fact make compact Copper? Is it readily available? If so, who makes it?
Thanks,
Mike
Given that I'll have 8 current carrying conductors, I'll derate to 70% which gives me a total ampacity (2 conductors) of 468A which allows me to use a 500A breaker.
Couple of questions:
1. I wouldn't ordinarily provide parallel conductors in the same conduit. Other than having to worry about derating, is there any code rule not permitting it.
2. I know they make compact Aluminum. Do they in fact make compact Copper? Is it readily available? If so, who makes it?
Thanks,
Mike