The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!


2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
International Wire Colour Codes
by Texas_Ranger
Today at 08:24 AM
Son of Sparky
by HotLine1
10/20/16 07:43 PM
Speaking of Plugmold ...
by gfretwell
10/17/16 02:37 PM
Broken battery charger? Check for cobwebs!
by gfretwell
10/17/16 02:30 PM
230 or 345 kV transmission lines?
by annemarie1
10/12/16 01:23 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 11
HotLine1 6
renosteinke 6
ghost307 5
Potseal 4
Who's Online
1 registered (hyetal), 201 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#75032 - 02/11/07 08:55 PM high bay lighting keeps tripping breakers
Clydesdale Offline

Registered: 11/25/04
Posts: 139
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?

Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#75033 - 02/11/07 10:22 PM Re: high bay lighting keeps tripping breakers
Elviscat Offline

Registered: 08/13/05
Posts: 214
Loc: Seattle Washington USA
if insulation is falling off the wires it's almost certainley time for a re-wire. In my opinion.

#75034 - 02/12/07 02:44 AM Re: high bay lighting keeps tripping breakers
jdo1942 Offline
Junior Member

Registered: 11/13/05
Posts: 32
Loc: 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.

#75035 - 02/12/07 07:27 AM Re: high bay lighting keeps tripping breakers
stevecheyenne Offline

Registered: 11/29/06
Posts: 38
Loc: 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).]

#75036 - 02/12/07 01:43 PM Re: high bay lighting keeps tripping breakers
Tom Offline

Registered: 01/01/01
Posts: 1069
Loc: 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.


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals