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#8235 - 03/13/02 05:28 PM walkway light poles on campus
menegt Offline
Member
Registered: 01/09/02
Posts: 34
Loc: sacramento, ca
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?
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#8236 - 03/14/02 04:03 AM Re: walkway light poles on campus
Redsy Offline
Member
Registered: 03/28/01
Posts: 2056
Loc: Bucks County PA
What is a christie box?
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#8237 - 03/14/02 07:10 AM Re: walkway light poles on campus
The Watt Doctor Offline
Member
Registered: 12/23/01
Posts: 435
Loc: Mont Belvieu, TX
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
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#8238 - 03/14/02 05:25 PM Re: walkway light poles on campus
menegt Offline
Member
Registered: 01/09/02
Posts: 34
Loc: sacramento, ca
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
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#8239 - 03/14/02 06:15 PM Re: walkway light poles on campus
resqcapt19 Offline
Member
Registered: 11/10/00
Posts: 2148
Loc: IL
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.
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Don(resqcapt19)
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#8240 - 03/14/02 07:46 PM Re: walkway light poles on campus
menegt Offline
Member
Registered: 01/09/02
Posts: 34
Loc: sacramento, ca
Yes.... very good idea. Thanks.
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#8241 - 03/15/02 04:58 AM Re: walkway light poles on campus
electure Offline


Member
Registered: 12/24/00
Posts: 4259
Loc: Fullerton, CA USA
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.
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#8242 - 03/15/02 08:50 AM Re: walkway light poles on campus
resqcapt19 Offline
Member
Registered: 11/10/00
Posts: 2148
Loc: IL
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)
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#8243 - 03/15/02 05:26 PM Re: walkway light poles on campus
Scott35 Offline

Broom Pusher and
Member
Registered: 10/19/00
Posts: 2707
Loc: Anaheim, CA. USA
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!
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#8244 - 03/15/02 07:08 PM Re: walkway light poles on campus
Redsy Offline
Member
Registered: 03/28/01
Posts: 2056
Loc: Bucks County PA
What is a christie box?
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