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high bay lighting keeps tripping breakers #75032
02/12/07 12:55 AM
02/12/07 12:55 AM
Clydesdale  Offline OP
Joined: Nov 2004
Posts: 138
My freind just recently started a business and rents an 18,000 square foot warehouse. Off the top of my head, there are about a dozen lighting circuits. The breakers should really all be replaced, and there are signs of overload in the wires(insulation falling off inside the load centers)A few of the breakers keep tripping, so I replaced them with new ones. He keeps calling me to change the breakers. As of right now, I still have a year left before I can take my journeyman's license. What would you do?

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Re: high bay lighting keeps tripping breakers #75033
02/12/07 02:22 AM
02/12/07 02:22 AM
Elviscat  Offline
Joined: Aug 2005
Posts: 214
Seattle Washington USA
if insulation is falling off the wires it's almost certainley time for a re-wire. In my opinion.

Re: high bay lighting keeps tripping breakers #75034
02/12/07 06:44 AM
02/12/07 06:44 AM
jdo1942  Offline
Junior Member
Joined: Nov 2005
Posts: 31
st. louis, mo. usa
I agree with last poster that it is time to rewire, but it sound like you have marginal circuit sizing and under size wire. I suggest you increase the number of circuits and increase the wire size for voltage drop.

This sames like are there just too many lights on a circuit. While circuit is not overloaded the it probably is pushing the 80% load. You need to get the load down so you are pulling no more than 80% including the 125% for continuous duty.

Re: high bay lighting keeps tripping breakers #75035
02/12/07 11:27 AM
02/12/07 11:27 AM
stevecheyenne  Offline
Joined: Nov 2006
Posts: 38
Yorba Linda, CA
Have you put an amprobe on the wiring to see what it is you're dealing with?

How old is this installation? What kind of fixtures are they? What kind of wire is it?

[This message has been edited by stevecheyenne (edited 02-12-2007).]

Re: high bay lighting keeps tripping breakers #75036
02/12/07 05:43 PM
02/12/07 05:43 PM
Tom  Offline
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
If the breakers are being used to control the lights, you should make sure that they are HID rated (it will be marked on the breaker, you usually have to special order these).

Few things are harder to put up with than the annoyance of a good example.


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