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3 phase transformer #163236
05/04/07 04:26 PM
05/04/07 04:26 PM
K
kyelectric  Offline OP
Member
Joined: Aug 2005
Posts: 64
On a 75kva 3 phase transformer I use my Ugly's book to see that it is rated for 180 amps full load current. Looking at the allowable ampacities of conductors table I can see that using 75 C column and going to 180 amps that I can use 4/0 alum. or copper clad cable. When I inspected the transformer I found it to be wired with 4/0 paralled USE type cables. Was that over kill or why did they parallel the cables with 6 line conductors and 2 neutrals instead of using 3 line conductors and 1 neutral. I know it can't hurt to over size the wire (except cost and lug size in the panels). Thanks!

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Re: 3 phase transformer [Re: kyelectric] #163237
05/04/07 04:29 PM
05/04/07 04:29 PM
C
codewarrior  Offline
Member
Joined: Dec 2005
Posts: 17
Camden,New Jersey
They problably did that because of voltage drop to a long distance load.

Re: 3 phase transformer [Re: codewarrior] #163260
05/04/07 09:37 PM
05/04/07 09:37 PM
K
kyelectric  Offline OP
Member
Joined: Aug 2005
Posts: 64
Codewarrior,
You are correct. I went back by there this afternoon and realized that the run is probably around 250 to 300 feet. So, they upsized to compensate for voltage drop. Thanks for the reply.

Re: 3 phase transformer [Re: kyelectric] #163263
05/04/07 09:49 PM
05/04/07 09:49 PM
C
codewarrior  Offline
Member
Joined: Dec 2005
Posts: 17
Camden,New Jersey
Glad I could be of help grin


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