13.8KV SWITCH AND 1500 KVA XFMR

[frostback]

WHAT IS THE CORRECT SIZE 13.8KV CABLE FOR THE PRIMARY SIDE OF A 1500KVA XFMR/277/480V SECONDARY

 

[bennie]

Re: 13.8KV SWITCH AND 1500 KVA XFMR

Depends on the calculated load.

 

[frostback]

Re: 13.8KV SWITCH AND 1500 KVA XFMR

LETS SAY THE CONNECTED LOAD IS 1300 KVA
THE FEEDER IS OVERHEAD IN A PARKING RAMP,HEATED,
IN A 4" RIGID STEEL CONDUIT

 

[tkirk911]

Re: 13.8KV SWITCH AND 1500 KVA XFMR

Primary is approximately 54 amps but here in Delaware we always pull 1/0 for primary. I think it is an Electric Company policy.

 

[ron]

Re: 13.8KV SWITCH AND 1500 KVA XFMR

You'll find at the ampacity that you need, the smallest 15kV cable made will be larger than you need. I think the smallest is 1/0AWG.
http://www.okonite.com/Product_Catalog/section2/sheet8.html

[ May 11, 2004, 07:13 PM: Message edited by: ron ]