600a + 400a service al conductor sizing

bgelectric

Senior Member
Hey everyone.
This came up recently and need some clarification.
Plans call for parallel 500mcm (no indication if cu or al) to a 3ph 600a service and a 3ph 400a service.
There are 2- 4" pvc conduits running to the services. The 600a has one 4" spare.
Looking at table 310.15b2a I can use parallel 350cu to the satisfy the 600a service and parrallel 3/0cu for the 400a service.
Also if looking at Al conductors I can use parallel 500al for the 600a service and parallel 250al for the 400a service.

Just want to make sure im on the right track.
Going by memory now i believe I can fit up to 7 - 500 xhhw into a 4" schedule 40 pvc so there are no issues there.
 

infinity

Moderator
Staff member
Location
New Jersey
Hey everyone.
This came up recently and need some clarification.
Plans call for parallel 500mcm (no indication if cu or al) to a 3ph 600a service and a 3ph 400a service.
There are 2- 4" pvc conduits running to the services. The 600a has one 4" spare.
Looking at table 310.15b2a I can use parallel 350cu to the satisfy the 600a service and parrallel 3/0cu for the 400a service.
Also if looking at Al conductors I can use parallel 500al for the 600a service and parallel 250al for the 400a service.

Just want to make sure im on the right track.
Going by memory now i believe I can fit up to 7 - 500 xhhw into a 4" schedule 40 pvc so there are no issues there.
You might have an issue with derating if there are more than 3 CCC's in that one raceway.
 
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