480v lighting troubleshoot

Thread Starter

Geoelectric

Joined Jun 10, 2011
2
I'm troubleshooting a parking lot light circuit. 22 1000watt lamps. 480v system. I should be looking at around 48 amps of load per leg. But I'm getting 48amps on one leg and 94 amps on the other. Can't figure it out why. Please help. Thanks
 

#12

Joined Nov 30, 2010
18,224
I can pretty much guess the schematic for the lights, but 46 missing amps is so large that I'd also guess you are making a mistake. How many phases are provided?
 

strantor

Joined Oct 3, 2010
6,798
Are all the lamps equal in terms of brightness? could one row of lights have been incorrectly replaced with higher wattage bulbs?
 

Thread Starter

Geoelectric

Joined Jun 10, 2011
2
there are seven light poles with 22 lamps in total with the same lamp, ballast and same brightness. Im not missing 46 amps. Im gaining the amps on one leg.
 

loosewire

Joined Apr 25, 2008
1,686
If all the leg's are the same,post a diagram to show what you are working with.
Having that difference in amps should show something in brightness.
Also be careful until you figure It out. Have you checked all the grounds
for bad connections.Let us know what you find.If every thing is showing ok
what brought the problem to your attention,what I am saying If the brightness
was all the same,why were you testing.Where did your complaint come from.
 
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