Duplex service feeder

[Silvertaco81]

I have a job where there are 2- 60 amp round meter sockets both meters are inline and both feeders go through 1- 1 1/4 pipe to panel in basement then one feeder goes to other panel through the first panel, all are fuses at the moment. my question is when i get a new dual stack meter socket i am going to run a new 100 amp panel for each of the units. how do i size the feeder for the dual 100 amp meter sockets to the PoCo do i take the Full load and run with #3's i just want a code article and to clarify my situation, i dont like doing things twice. all your help is appreciated .

 

[kwired]

I have a job where there are 2- 60 amp round meter sockets both meters are inline and both feeders go through 1- 1 1/4 pipe to panel in basement then one feeder goes to other panel through the first panel, all are fuses at the moment. my question is when i get a new dual stack meter socket i am going to run a new 100 amp panel for each of the units. how do i size the feeder for the dual 100 amp meter sockets to the PoCo do i take the Full load and run with #3's i just want a code article and to clarify my situation, i dont like doing things twice. all your help is appreciated .

If I understand correctly you will have a single service conductor that supplies multiple service disconnecting means. If so that "common" portion of the conductor only needs to have sufficient ampacity to carry calculated load. So even though you have two 100 amp service disconnecting means, if total load calculation is only 135 amps - that common conductor technically only needs to be 135 amp conductor.

conductors that only go to an individual overcurrent device need to have ampacity that corresponds with that overcurrent device though - so in your case after you split from being one common conductor - you must have 100 amp conductor to each disconnect.

See 230.42 as well as 230.90(A) - in particular exception 3.

 

[Dennis Alwon]

Your terminology is confusing. Are you looking for the wire size going from the meter stack to the power company? That is not a feeder but rather service conductors.

If you want to run individual feeders to each panel from a meter main stack unit then you must size the wire for the 100 amp breaker #3 copper

 

[Silvertaco81]

Your terminology is confusing. Are you looking for the wire size going from the meter stack to the power company? That is not a feeder but rather service conductors.

If you want to run individual feeders to each panel from a meter main stack unit then you must size the wire for the 100 amp breaker #3 copper

so say i have 55 amps on each service calculated my wires going from Meter socket to PoCo should be#2CU which is 115amp to carry total calculated load then from meter socket to Panel i can Run # 4 and place it on a 100 amp main per 310.15 (B)(7)

 

[kwired]

so say i have 55 amps on each feeder calculated my wires going from Meter socket to PoCo should be#2CU which is 115amp to carry total calculated load then from meter socket to Panel i can Run # 4 and place it on a 100 amp main per 310.15 (B)(7)

I changed "service" to "feeder" in quote, as changed is true. Doesn't really leave room to add future load but is NEC compliant.