mstrlucky74
Senior Member
- Location
- NJ
Job allows substitution of CU conductors with AL forfeeders. A few questions :
ODPL(400A MCB) is feeding OAPL(225A MLO). Don’t theconductors need to be sized to the OCPD FEEDING the load(OAPL)?? 2/0 would besufficient for the 225A OAPL but not the 400A ODPL. Or should my thinking bethe other way around?
So if I would swap these conductors from CU to AL. I couldn’tuse #250 AL as the chart suggests as that doesn’t look like enough whenreferencing 310.16. I think I need #300.
What about the ground size? What do I reference to upsizethat when going from CU to Al?
I know I need to obviously upsize the conduit too.
Thanks.
ODPL(400A MCB) is feeding OAPL(225A MLO). Don’t theconductors need to be sized to the OCPD FEEDING the load(OAPL)?? 2/0 would besufficient for the 225A OAPL but not the 400A ODPL. Or should my thinking bethe other way around?
So if I would swap these conductors from CU to AL. I couldn’tuse #250 AL as the chart suggests as that doesn’t look like enough whenreferencing 310.16. I think I need #300.
What about the ground size? What do I reference to upsizethat when going from CU to Al?
I know I need to obviously upsize the conduit too.
Thanks.
