480v lighting troubleshoot

Discussion in 'General Electronics Chat' started by Geoelectric, Jun 10, 2011.

  1. Geoelectric

    Thread Starter New Member

    Jun 10, 2011
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    0
    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
     
  2. #12

    Expert

    Nov 30, 2010
    16,248
    6,745
    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?
     
  3. strantor

    AAC Fanatic!

    Oct 3, 2010
    4,302
    1,988
    Are all the lamps equal in terms of brightness? could one row of lights have been incorrectly replaced with higher wattage bulbs?
     
  4. Geoelectric

    Thread Starter New Member

    Jun 10, 2011
    2
    0
    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.
     
  5. loosewire

    AAC Fanatic!

    Apr 25, 2008
    1,584
    435
    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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