Looks like service and feeders can be permitted to have an ampacity not less than 83 percent of the Service rating.
Using the table 310.12
# 2 aluminum is good for 100amp, and 1/0 aluminum is rated for 125 amps.
I have a 200ameter main combo at a pole about 75 feet from the house. This is my service disconnect and would be allowed to follow 310.12 for my conductors
On the back side of the pole I have a 200 amp man lug panel it’s fed with 3/0 copper feeders and should also be allowed to follow 310.12
It then feeds to an 100a emergency disconnect on the outside of the house from a 100a cb fin the 200a main lug panel at the pole. These feeders should also be allowed to follow 310.12 and should be able to be sized #2aluminum. I believe they’re actually 1/0 aluminum.
The 100a emergency disconnect then feeds a sub panel in the basement with Ser- 2,2,2,4 aluminum if I understand correct these should also be allowed to follow 310.12 because they carry the entire load.
The basement 100a main lug panel then feeds a 100a main breaker panel upstairs with ser 2,2,2,4 aluminum, and because this doesn’t carry the entire load it is not allowed to follow 310.12 because it’s ser it should be under the 60 degree column and 2 aluminum is only good for 75 amps.
Thanks for any and all help. I don’t do residential much anymore, but I hope I still have somewhat of a god understanding. I appreciate any and all help thanks in advance!
Using the table 310.12
# 2 aluminum is good for 100amp, and 1/0 aluminum is rated for 125 amps.
I have a 200ameter main combo at a pole about 75 feet from the house. This is my service disconnect and would be allowed to follow 310.12 for my conductors
On the back side of the pole I have a 200 amp man lug panel it’s fed with 3/0 copper feeders and should also be allowed to follow 310.12
It then feeds to an 100a emergency disconnect on the outside of the house from a 100a cb fin the 200a main lug panel at the pole. These feeders should also be allowed to follow 310.12 and should be able to be sized #2aluminum. I believe they’re actually 1/0 aluminum.
The 100a emergency disconnect then feeds a sub panel in the basement with Ser- 2,2,2,4 aluminum if I understand correct these should also be allowed to follow 310.12 because they carry the entire load.
The basement 100a main lug panel then feeds a 100a main breaker panel upstairs with ser 2,2,2,4 aluminum, and because this doesn’t carry the entire load it is not allowed to follow 310.12 because it’s ser it should be under the 60 degree column and 2 aluminum is only good for 75 amps.
Thanks for any and all help. I don’t do residential much anymore, but I hope I still have somewhat of a god understanding. I appreciate any and all help thanks in advance!
