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#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

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#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.

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