mkgrady
Senior Member
- Location
- Massachusetts
When can we actually use the 90 degree column for conductor ampacity? I consider it when derating for more than 3 ccc's and for temperature adjustments but I have never used it otherwise.
I am getting ready to change the service at a small church. Right now it has a very old 200 amp service and I'm looking to not only replace it but I'd like to get a little more out of it if possible. The feed from the meter socket is relatively new 3/0 copper use-2 and I plan to reuse it. When I look up the ampacity of that wire I find it rated 225 amps in the 90 degree column.
Does that say I can use a MCB panel with a 225 amp main breaker?
I am getting ready to change the service at a small church. Right now it has a very old 200 amp service and I'm looking to not only replace it but I'd like to get a little more out of it if possible. The feed from the meter socket is relatively new 3/0 copper use-2 and I plan to reuse it. When I look up the ampacity of that wire I find it rated 225 amps in the 90 degree column.
Does that say I can use a MCB panel with a 225 amp main breaker?