ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Calling all Non-US members!! (Non-US only)
by HotLine1. 06/13/18 01:50 PM
GE Lighting Recalls LED Tube Lamps
by Admin. 06/12/18 09:32 PM
Ketra Recalls Recessed Downlights
by Admin. 06/12/18 09:17 PM
diazed fuses
by Texas_Ranger. 06/11/18 07:31 AM
soda can fuse from UK, facebook
by wa2ise. 06/06/18 11:02 PM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 10 guests, and 7 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Metal halide light tripping #177857
05/13/08 09:47 PM
05/13/08 09:47 PM
S
schenimann  Offline OP
Member
Joined: Feb 2008
Posts: 193
Western North Carolina
I went on a service call yesterday. In a store downtown, a lady had a 250 watt metal halide light that would trip off then come back on. The breaker never trips, only the light. It would do this once, maybe twice a day, sometimes not at all. It is a fairly new fixture, isn't in a location where it would build up excessive heat and it is a 250w ballast.

The outlet that it is plugged into was originally a 220 outlet converted to a 110. Whoever had worked on it previously had used one of the hots and the ground as a neutral. Our fix was to use the other hot as a neutral and yes, we did go to every jbox we could trace and mark it neutral. Would using the ground as a neutral cause the light to trip? If not, what else?

Work Gear for Electricians and the Trades
Re: Metal halide light tripping [Re: schenimann] #177859
05/13/08 10:03 PM
05/13/08 10:03 PM
S
sparkyinak  Offline
Member
Joined: Jul 2007
Posts: 1,334
Alaska
Bad bulbs. HPS does the same thing


"Live Awesome!" - Kevin Carosa
Re: Metal halide light tripping [Re: sparkyinak] #177860
05/13/08 10:33 PM
05/13/08 10:33 PM
T
twh  Offline
Member
Joined: Mar 2004
Posts: 945
Regina, Sask.
I agree a bad HPS bulb will cycle. I'm not sure about MH bulbs. I thought I saw it last week, but when I suggested a new bulb, the carpenters were all over me. They had already tracked it down to voltage drop when another piece of equipment started. Now, I don't think I've seen an MH bulb do that.

Re: Metal halide light tripping [Re: twh] #177861
05/13/08 11:26 PM
05/13/08 11:26 PM
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
You probably had a high resistance ground ... this had the effect of lowering the voltage .... not enough volts, bulb would try to re-strike.

Re: Metal halide light tripping [Re: renosteinke] #177862
05/13/08 11:28 PM
05/13/08 11:28 PM
S
schenimann  Offline OP
Member
Joined: Feb 2008
Posts: 193
Western North Carolina
Should fixing the neutral fix this?


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Joe Tedesco
Joe Tedesco
Boston, Massachusetts USA
Posts: 2,749
Joined: October 2000
Show All Member Profiles 
Top Posters(30 Days)
twh 5
Popular Topics(Views)
247,618 Are you busy
184,963 Re: Forum
174,203 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.022s Queries: 15 (0.004s) Memory: 0.9684 MB (Peak: 1.1075 MB) Zlib enabled. Server Time: 2018-06-20 22:37:45 UTC