ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Violation?
by renosteinke - 01/27/23 09:52 PM
Does NEC 551.71 (F) apply to dwellings?
by BigB - 01/20/23 10:46 AM
Power submeter connections
by HotLine1 - 01/19/23 09:09 AM
AFDD's coming to the UK
by Texas_Ranger - 01/17/23 07:22 PM
New in the Gallery:
Burger King crown sillyness
Burger King crown sillyness
by wa2ise, December 11
240/208 to a house
240/208 to a house
by wa2ise, October 9
Who's Online Now
0 members (), 123 guests, and 14 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 3 1 2 3
#139258 10/25/03 09:00 PM
Joined: Oct 2003
Posts: 25
R
ryanjuk Offline OP
Member
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 from jcra.net]

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]

#139259 10/25/03 09:07 PM
Joined: Aug 2003
Posts: 1,374
R
Moderator
What a great name you have!!!!!


Ryan Jackson,
Salt Lake City
#139260 10/25/03 09:17 PM
Joined: Oct 2003
Posts: 25
R
ryanjuk Offline OP
Member
[Linked Image]

#139261 10/26/03 03:12 AM
Joined: Jul 2002
Posts: 8,432
Likes: 3
Member
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

#139262 10/26/03 10:06 AM
Joined: Aug 2001
Posts: 7,520
P
Member
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 06:21 PM
Joined: Oct 2003
Posts: 25
R
ryanjuk Offline OP
Member
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 07:11 PM
Joined: Jul 2002
Posts: 8,432
Likes: 3
Member
Ryan,
Yes this is correct,
Most street lighting systems are either controlled by a Photocell or by Electronic timer. [Linked Image]

#139265 10/26/03 10:39 PM
Joined: May 2001
Posts: 717
G
Member
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 10:47 PM
Joined: Jul 2002
Posts: 8,432
Likes: 3
Member
George,
Just trying to think.
How would that be configured?. [Linked Image]

#139267 10/27/03 02:04 PM
Joined: Aug 2001
Posts: 7,520
P
Member
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

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *
2023 National Electrical Code (NEC)
2023 NEC Now Available!
 
* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Joe Tedesco
Joe Tedesco
Boston, Massachusetts USA
Posts: 2,749
Joined: October 2000
Top Posters(30 Days)
BigB 9
triple 3
Popular Topics(Views)
302,477 Are you busy
231,873 Re: Forum
216,498 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5