ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
600 KW 120/208 3 Phase Y protection
by Yooperup. 07/24/17 12:20 PM
1913 American Electrician's Handbook
by gfretwell. 07/20/17 01:08 PM
Green House wiring
by ghost307. 07/20/17 09:10 AM
Permit Snafus...AHJs and Contractors Jump in
by HotLine1. 07/18/17 08:06 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
239,359 Are you busy
174,821 Re: Forum
167,210 Need opinion
Who's Online Now
0 registered members (), 53 guests, and 4 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#19098 - 12/19/02 10:15 PM Short Circuit  
Superduty  Offline
Junior Member
Joined: Dec 2002
Posts: 3
Denver, CO USA
We have a 20amp-120v ballasted lighting circuit that opens after 48 hrs of non continuous load. It operates 3 - 3.6 amp ballast's that are all in their range according to Advance, and they run through a 25 amp photocell. All fourescent sign lights are working & we have changed the breaker & phtotcell & one leaking ballast.
Thanks, Mike

Work Gear for Electricians and the Trades

#19099 - 12/19/02 10:51 PM Re: Short Circuit  
Nick  Offline
Joined: Aug 2001
Posts: 599
Riverside, CA
Have you put an amprobe on the circuit to verify that 10.8A is in fact all you are drawing? Maybe there is something else on the line you don’t know about.

#19100 - 12/20/02 12:12 AM Re: Short Circuit  
Superduty  Offline
Junior Member
Joined: Dec 2002
Posts: 3
Denver, CO USA

Thanks for your input, we used a clamp on amprpobe and got just under 11amps total.

#19101 - 12/20/02 08:51 AM Re: Short Circuit  
WARREN1  Offline
Joined: May 2001
Posts: 176
Greenville, SC, USA
You may have to rent a recording ampmeter and check the loads. This way you can tell when the circuit peaks and trips the breaker which may give you some clues as to what is happening. I think GE Supply rents this kind of equipment.

#19102 - 12/20/02 02:17 PM Re: Short Circuit  
gregoryf  Offline
Joined: Aug 2002
Posts: 19
Ketchikan AK USA
My bet is one of the other 2 ballasts is going out. I would replace the other 2 now. I am assuming you have already replaced all 3 lamps.....

#19103 - 12/20/02 09:23 PM Re: Short Circuit  
Superduty  Offline
Junior Member
Joined: Dec 2002
Posts: 3
Denver, CO USA
Thanks for your input.

I checked to make sure all that was on this line was the 3 ballasts. I isolated them and each draws 3.6 amps each.
The load has been continuous for 36 hrs now and the 20amp breaker is warm to the touch. 12 gauge wire to the panel.
Should we separate these signs and give them each their own circuit?
1 has 4- 10 foot HO lamps= 1 ballast.
1 has 10- 6 foot HO lamps= 1 ballast per 5.

Member Spotlight
Nicholson Ga
Posts: 34
Joined: June 2006
Show All Member Profiles 

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


Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.012s Queries: 14 (0.002s) Memory: 0.7746 MB (Peak: 0.9221 MB) Zlib enabled. Server Time: 2017-07-27 12:35:11 UTC