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 (), 50 guests, and 15 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
#8235 03/13/02 08:28 PM
Joined: Jan 2002
Posts: 34
M
menegt Offline OP
Member
Situation: Many light poles in campus walkways. 3 circuits (277V) feeding them. At times ballast go bad and circuit trips or bad connection in cristie(sp) box. Spend many hours tracing to exact pole(s)

Problem: How to save time in finding correct pole which is bad. When the circuit trips it trips the hole bank of lights (20) lights or so per leg (HPS 100W). I was thinking of putting some sort of in-line fuse w/ a popout indicator on each pole. What do you guys think any suggestions? It's a real hassle trying to peel of switch legs here and there. There's about 20 Christie boxes.... Any suggestions?

Joined: Mar 2001
Posts: 2,056
R
Member
What is a christie box?

Joined: Dec 2001
Posts: 440
Likes: 3
Member
I would mark the poles that represent 1/4, 1/2, and 3/4 points on the circuit. Everytime you have a problem on that circuit, go to the pole that represents the halfway point on the circuit, and break the joints. Go turn the breaker on. If the circuit breaker trips, you know the problem is on the first half of the circuit. If it doesn't, you know that the problem is on the second half. Remake the joints at the halfway point, and go to either the 1/4, or 3/4 point, and start the process over again.
This is know as "half splitting".
Good Luck.
Regards,
Doc


The Watt Doctor
Altura Cogen
Channelview, TX
Joined: Jan 2002
Posts: 34
M
menegt Offline OP
Member
Thanks Doc, good advice. Unfortunately at the University, before I got there there have been many runs which have been re-pulled, conduit abandoned and backfed... it's a real mess. The best I/We could do is disconnect at a halfway point which you mentioned and at this point 20 or lights are out and it's like trying to find a needle in a haystack. We certain sectors in the campus which are broken up exactly the way you have mentioned. Troubleshooting not too bad on that one. I was just wondering if there was a way to install some sort of pop-up indicator on tha actual pole or via an inline splice or something. I know I could physicaly install it but does this sound kind of McGyver-ish?

Mike

Joined: Nov 2000
Posts: 2,148
R
Member
Why not just use the inline fuses at each pole. You don't need any type of "popout indicator". Just turn the power on and look for the fixtures that aren't lit.


Don(resqcapt19)
Joined: Jan 2002
Posts: 34
M
menegt Offline OP
Member
Yes.... very good idea. Thanks.

Joined: Dec 2000
Posts: 4,291
Member
Does anybody have a good source for the inline fuseholders? I've had some trouble locating good, UL listed ones for this application in the past.

Joined: Nov 2000
Posts: 2,148
R
Member
electure,
Look at Bussmann's HFA series for 250 volts or less and the HEH series for 480 volt applications. The HFA products are UL recognizied and the HEH are CSA certified.
Don(resqcapt19)


Don(resqcapt19)
Joined: Oct 2000
Posts: 2,722
Broom Pusher and
Member
Menegt,

I like your fuse idea. That would help identify one or more overloading fixtures.

I have a feeling that these Ballasts do not have a Power Factor Correcting Capacitor installed. Have recently installed some new Hubbell HPS fixtures [100 watt HPS - ANSI S54 lamp] and there was no Capacitor included.
That makes the PF only 50%, so there's close to 2 times more current drawn.

I included this to give a possible fix - try installing Capacitors to lower the Line Amperes / KVA.

Scott SET


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Joined: Mar 2001
Posts: 2,056
R
Member
What is a christie box?

Page 1 of 2 1 2

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
Niko
Niko
Campbell, CA
Posts: 356
Joined: August 2006
Top Posters(30 Days)
BigB 9
triple 3
Popular Topics(Views)
302,469 Are you busy
231,869 Re: Forum
216,491 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5