ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
Dimmable LED 2x4 lay in fixtures
by HotLine1. 04/24/17 05:43 PM
Old decora style outlets
by Lostazhell. 04/22/17 07:59 PM
Permit Snafus...AHJs and Contractors Jump in
by gfretwell. 04/22/17 01:11 PM
How do you find a good employee?
by HotLine1. 04/22/17 10:44 AM
Electrode boilers question
by SteveFehr. 04/21/17 08:32 AM
New in the Gallery:
SE cable question
Popular Topics(Views)
234,683 Are you busy
169,407 Re: Forum
162,726 Need opinion
Who's Online Now
0 registered members (), 86 guests, and 10 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#187656 - 07/06/09 02:21 PM Old transformer  
gfretwell  Offline

Joined: Jul 2004
Posts: 9,069
This is an old transformer I saw in Marion NC. I have never seen one as skinny as this.

[Linked Image]

Greg Fretwell

Tools for Electricians:

#187705 - 07/07/09 09:53 PM Re: Old transformer [Re: gfretwell]  
wa2ise  Offline
Joined: Nov 2002
Posts: 782
Oradell NJ USA
Looks like a 3 phase transformer, likely inside the first phase's core is at top, then in the middle the 2nd phase's core, and at the bottom the 3rd phase's core. I see 3 insulated primary feeds, so it may be a delta primary and likely a Y secondary. I once lived in an apartment complex fed by such a transformer, and each apt had 120/208V, 2 of the 3 phases.

#187717 - 07/08/09 01:08 AM Re: Old transformer [Re: wa2ise]  
frenchelectrican  Offline
Joined: Feb 2003
Posts: 939
Wi/ Paris France { France for ...
I did see few like that in my area in Wisconsin however in France it is pretty common with older one and they are typically 15 or 25 KW size and I did see one not far from me someday I should take a photo that is single can with triphase system in there that one is 50 KW size.


Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)

#187742 - 07/08/09 11:48 AM Re: Old transformer [Re: frenchelectrican]  
mamills  Offline
Joined: Nov 2001
Posts: 745
Wharton, Texas, USA
Looks like there are four secondary conductors leading away from it. If the cores are stacked (which sounds like the only plausible arrangement), they must be pretty small capacity.
Greg, do you remember what this transformer supplied power to? I'm not too sure I have ever seen a poly-phase pole transformer before...seen lots of pad-mounted ones.

Great find, too. Older equipment finds like this are fascinating...the older, the better.

Mike (mamills)

#187745 - 07/08/09 12:03 PM Re: Old transformer [Re: mamills]  
gfretwell  Offline

Joined: Jul 2004
Posts: 9,069
It was in the commercial/retail area of a small town in the mountains. I am not sure what was in the building it served.

Greg Fretwell

#187749 - 07/08/09 03:15 PM Re: Old transformer [Re: gfretwell]  
LarryC  Offline
Joined: Jul 2004
Posts: 783
Winchester, NH, US
An older house with the original 3 phase air conditioning system from the 1950's?

#187750 - 07/08/09 04:25 PM Re: Old transformer [Re: LarryC]  
wa2ise  Offline
Joined: Nov 2002
Posts: 782
Oradell NJ USA
Originally Posted by LarryC
An older house with the original 3 phase air conditioning system from the 1950's?

In Oradell NJ (PSE&G)(my home town) there's an old development with several houses fed with open delta service. For central air. 120/240 and 208 wild leg.

#187770 - 07/09/09 12:56 AM Re: Old transformer [Re: wa2ise]  
EV607797  Offline
Joined: Oct 2006
Posts: 745
Fredericksburg, VA, USA
Yep, my first apartment was in Emerson, NJ and we had one of those bad boys feeding our cluster of buildings. My building had been converted to eliminate the wild leg and was strictly single-phase. I never understood the need for the wild leg since none of these buildings even had central A/C or any large loads for that matter. Everything was "hotel-type" through the wall heat pump units. The only thing that I could figure is that since we were located next-door to a shopping center, perhaps PSE&G just equipped the whole area the same way, whether needed or not. The places were built in the 1960's, back when cost was not object.


"But the guy at Home Depot said it would work."

Member Spotlight
Posts: 27
Joined: December 2004
Show All Member Profiles 

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.015s Queries: 15 (0.003s) Memory: 0.7935 MB (Peak: 0.9570 MB) Zlib enabled. Server Time: 2017-04-25 16:38:55 UTC