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walkway light poles on campus #8235 03/13/02 09:28 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?

Work Gear for Electricians and the Trades
Re: walkway light poles on campus #8236 03/14/02 08:03 AM
Joined: Mar 2001
Posts: 2,056
R
Redsy Offline
Member
What is a christie box?

Re: walkway light poles on campus #8237 03/14/02 11:10 AM
Joined: Dec 2001
Posts: 437
The Watt Doctor Offline
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
Re: walkway light poles on campus #8238 03/14/02 09:25 PM
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

Re: walkway light poles on campus #8239 03/14/02 10:15 PM
Joined: Nov 2000
Posts: 2,148
R
resqcapt19 Offline
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)
Re: walkway light poles on campus #8240 03/14/02 11:46 PM
Joined: Jan 2002
Posts: 34
M
menegt Offline OP
Member
Yes.... very good idea. Thanks.

Re: walkway light poles on campus #8241 03/15/02 08:58 AM
Joined: Dec 2000
Posts: 4,283
electure Offline
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.

Re: walkway light poles on campus #8242 03/15/02 12:50 PM
Joined: Nov 2000
Posts: 2,148
R
resqcapt19 Offline
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)
Re: walkway light poles on campus #8243 03/15/02 09:26 PM
Joined: Oct 2000
Posts: 2,721
Scott35 Offline
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!
Re: walkway light poles on campus #8244 03/15/02 11:08 PM
Joined: Mar 2001
Posts: 2,056
R
Redsy Offline
Member
What is a christie box?

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