ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
Why cables look like they do
by LongRunner. 04/26/17 09:36 AM
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
New in the Gallery:
SE cable question
Popular Topics(Views)
234,796 Are you busy
169,564 Re: Forum
162,827 Need opinion
Who's Online Now
0 registered members (), 61 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
Page 1 of 3 1 2 3
#139258 - 10/25/03 10:00 PM Pole mount XFMR  
ryanjuk  Offline
Member
Joined: Oct 2003
Posts: 25
N/A
Hello,

I just found this picture on my computer, didn't know if you'd be interested in it, so I'll post it anyway.

[Linked Image]

I found it behind a high-school in my area.

I believe that is 11kV coming in from the right, correct?

What are the cables on the left hand side doing?

Three phases + Neutral, and?

Thanks,
Bye [Linked Image]


Test Equipment:
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement

#139259 - 10/25/03 10:07 PM Re: Pole mount XFMR  
Ryan_J  Offline
Moderator
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
What a great name you have!!!!!


Ryan Jackson,
Salt Lake City

#139260 - 10/25/03 10:17 PM Re: Pole mount XFMR  
ryanjuk  Offline
Member
Joined: Oct 2003
Posts: 25
N/A
[Linked Image]


#139261 - 10/26/03 04:12 AM Re: Pole mount XFMR  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,211
SI,New Zealand
ryanjuk,
Welcome to ECN!.
That's a good pic.
My best guess would be that it's a Pilot wire for the Hot Water Ripple control or for controlling Street-Lighting


Let's face it, these days if you're not young, you're old - Red Green grin

#139262 - 10/26/03 11:06 AM Re: Pole mount XFMR  
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Hi Ryan, and welcome to ECN.

Yes, that looks like 11kV coming in at the top. There are clearly two sets of fuse cut-outs on the secondary side. I would guess that those on the right-hand pole go to an underground feeder.

The 5th-wire arrangement used to be employed here in the past for street lighting. There may be a few places still using the system, but it's been a long time since I've seen it. Some old poles still have the fifth bracket/insulator on them, but in most cases the extra conductor was removed many years ago.

Whereabouts in Britain is this photo from?\


#139263 - 10/26/03 07:21 PM Re: Pole mount XFMR  
ryanjuk  Offline
Member
Joined: Oct 2003
Posts: 25
N/A
The photo is from Southern Scotland [Linked Image]

If it were for street-lighting, would the 5th wire just become live when it got dark?


#139264 - 10/26/03 08:11 PM Re: Pole mount XFMR  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,211
SI,New Zealand
Ryan,
Yes this is correct,
Most street lighting systems are either controlled by a Photocell or by Electronic timer. [Linked Image]


Let's face it, these days if you're not young, you're old - Red Green grin

#139265 - 10/26/03 11:39 PM Re: Pole mount XFMR  
George Corron  Offline
Member
Joined: May 2001
Posts: 717
Lorton, Va USA
OK, I hate to throw "stuff" in the game...... or maybe I don't. [Linked Image]

If I saw that in this country, I'd be thinking 5 wire/2phase, did they ever USE that across the pond?????


#139266 - 10/26/03 11:47 PM Re: Pole mount XFMR  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,211
SI,New Zealand
George,
Just trying to think.
How would that be configured?. [Linked Image]


Let's face it, these days if you're not young, you're old - Red Green grin

#139267 - 10/27/03 03:04 PM Re: Pole mount XFMR  
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Quote
I'd be thinking 5 wire/2phase, did they ever USE that across the pond?????

I can't say it was never used in public distribution, but if it was it must have been confined to the early days.

LV distribution standardized pretty early on with 3-wire DC and 4-wire 3-phase wye AC.

Ryan,
If you're in the area, can you see if there is anything actually connected to that fifth (bottom) wire on the pole?


Page 1 of 3 1 2 3

Member Spotlight
Alan Belson
Alan Belson
Mayenne N. France
Posts: 1,803
Joined: March 2005
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.017s Queries: 15 (0.003s) Memory: 0.8187 MB (Peak: 0.9927 MB) Zlib enabled. Server Time: 2017-04-27 11:01:15 UTC