Sending 700A of 208V 350ft T

[MJRobinson]

I have a 307A /480V transformer generating 708A of 208V.

I need to send underground 708A this 350ft. no room for a transformer at load center.

THWN Copper @ 75degrees on the Ampcity chart can only handle 665A at 2000mcm, THWN Aluminum @ 560A was my preferred.

Thoughts on a solution for this?

thanks

 

[infinity]

If you use 4 parallel sets of 600 kcmil aluminum that will work.

 

[drcampbell]

Voltage drop needs to be considered as well as ampacity.
The design should be based on the actual load, not the transformer capacity.
If there's any possibility of moving the transformer closer to the load and using the higher voltage for much of the length, that'll save a whole lot of wire, conduit & cost.

 

[MJRobinson]

No Room

No Room

Voltage drop needs to be considered as well as ampacity.
The design should be based on the actual load, not the transformer capacity.
If there's any possibility of moving the transformer closer to the load and using the higher voltage for much of the length, that'll save a whole lot of wire, conduit & cost.

I wish, they have no space available near building. Voltage drop is okay above 500mcm.

 

[MJRobinson]

Calculation for that

Calculation for that

If you use 4 parallel sets of 600 kcmil aluminum that will work.

I've considered this as an option, the conduit has not been run. Can you point me to that calculation?

Michael

 

[infinity]

I've considered this as an option, the conduit has not been run. Can you point me to that calculation?

Michael

You can try this:

https://www.southwire.com/support/voltage-drop-calculator.htm