Service Conductor

[curious23]

I am curious about the service conductor size for a Commercial Service that has 2, 200 amp meters, single phase 120/240 vac. The service conductors will supply both meters, the meters will be in a multi-socket (2-200amp) meter base. I am thinking a 3" conduit with 4/0 thhn cu conductors in parallel. Would the 4/0 conductors be overkill? Is there a NEC reference that would allow me to reduce the conductor size? To my knowledge, the 83% rule does not apply to Commercial Properties.

 

[curious23]

I am curious about the service conductor size for a Commercial Service that has 2, 200 amp meters, single phase 120/240 vac. The service conductors will supply both meters, the meters will be in a multi-socket (2-200amp) meter base. I am thinking a 3" conduit with 4/0 thhn cu conductors in parallel. Would the 4/0 conductors be overkill? Is there a NEC reference that would allow me to reduce the conductor size? To my knowledge, the 83% rule does not apply to Commercial Properties.

I do know that the Grounded Conductor ( Neutral) can be sized at 100% of the load.

 

[augie47]

230.42 requires they be sized to carry the computed load.

 

[electrofelon]

230.42 requires they be sized to carry the computed load.

Also OP should note 230.90(A) exception #3, that is where there are multiple service disconnects, the service conductors can be sized strictly to the load with no coordination or concern of the sum of the service disconnect ratings.