ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
dsk 13
Admin 8
Recent Posts
Grid problem??
by annemarie1. 08/21/17 01:10 PM
Bathroom electrical
by doc. 08/19/17 06:53 AM
electircal ageing test on IPC
by SIAME. 08/15/17 02:43 AM
electrical aging test on IPC
by gfretwell. 08/15/17 12:27 AM
"Line level" audio on Cat 5?
by gfretwell. 08/08/17 10:39 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
240,059 Are you busy
175,682 Re: Forum
167,900 Need opinion
Who's Online Now
0 registered members (), 58 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#163236 - 05/04/07 05:26 PM 3 phase transformer  
kyelectric  Offline
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!


Work Gear for Electricians and the Trades

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


#163260 - 05/04/07 10:37 PM Re: 3 phase transformer [Re: codewarrior]  
kyelectric  Offline
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.


#163263 - 05/04/07 10:49 PM Re: 3 phase transformer [Re: kyelectric]  
codewarrior  Offline
Member
Joined: Dec 2005
Posts: 17
Camden,New Jersey
Glad I could be of help grin



Member Spotlight
BEAMEUP
BEAMEUP
WA
Posts: 27
Joined: December 2004
Show All Member Profiles 
Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.013s Queries: 15 (0.003s) Memory: 0.7595 MB (Peak: 0.8900 MB) Zlib enabled. Server Time: 2017-08-22 05:25:49 UTC