ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Strobing LEDs
by Anovalight - 06/20/24 03:16 AM
Stuff that happens after we leave
by HotLine1 - 06/17/24 03:53 PM
photocell requirement for metal halide ballasts
by gfretwell - 06/17/24 01:44 PM
Commercial lift stations
by triple - 06/09/24 05:23 PM
Photo cell diagram for MH100w light
by Wayles3 - 06/02/24 07:32 AM
New in the Gallery:
This is a new one
This is a new one
by timmp, September 24
Few pics I found
Few pics I found
by timmp, August 15
Who's Online Now
0 members (), 41 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 10:00 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 10:07 PM
Joined: Aug 2003
Posts: 1,374
R
Moderator
What a great name you have!!!!!


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

#139261 10/26/03 04:12 AM
Joined: Jul 2002
Posts: 8,443
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 11:06 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 07:21 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 08:11 PM
Joined: Jul 2002
Posts: 8,443
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 11:39 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 11:47 PM
Joined: Jul 2002
Posts: 8,443
Likes: 3
Member
George,
Just trying to think.
How would that be configured?. [Linked Image]

#139267 10/27/03 03:04 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
Powered by UBB.threads™ PHP Forum Software 7.7.5