wire size

[integrity]

This is a new single family dwelling with single phase, 240V, 200amp breaker main panel, 400 ft. from power company service hookup at street. Off main panel is a barn 200 ft. from main house panel with 100amp feeder. What size lateral service entrance and feeder wire do I use???????????????????? Please answer ASAP, customer waiting, I'm frustrated.
Thank you and God bless you.

 

[Guest]

Re: wire size

code allows per table 310.15(B)(6) the use of 4/0 al or 2/0 copper for a 200 a service. I would use 250mcm al or or 3/0 copper however to miumize voltage drop at the main service. 310-16 allows #1 al or #cu use wire. Again however I would use 1/0 al or #2 cu to allow for voltage drop in the barn feeders. hope this helps. Joe

 

[pierre]

Re: wire size

There are no restrictions in the NEC for voltage drop, only FPNs for advisory information. 210.19(A)FPN, and 215.2(4)FPN

Without knowing your actual load, 1/0 or 2/0 Aluminum would be in the ballpark.

Pierre

 

[jimwalker]

Re: wire size

The 4/0 aluminum will carry the 200 amps with no problem, but to determine the voltage drop we will need to select a load.Are we taking that 100 amps from the 200 ? or is this 300 amps total from road?

 

[roger]

Re: wire size

Jim, take note of integrity's use of "lateral service entrance" and "feeder".

This would explain there is a "downstream" panel from the 200 amp "main" panel.


Roger