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Thread: High amps on LED lighting circuit

  1. #1
    Join Date
    Jul 2017
    Midlothian, Virginia

    High amps on LED lighting circuit

    All of a sudden, a 2 pole 20 amp 208 volt breaker started tripping on an LED circuit. When I troubleshot the circuit I found out that one leg was drawing 49 amps and the other leg was barely drawing anything at all. I also went through each light and disconnected that light from the circuit one at a time and the breaker still tripped when I did this on all of the lights. This circuit has been on constantly for around a year-and-a-half and hasn't had a problem and all of a sudden this started happening. Was wondering if anyone had any knowledge on this issue or has dealt with this in the past.

  2. #2
    Join Date
    Apr 2008
    Ann Arbor, Michigan
    170713-1041 EDT

    Your question is not real clear.

    You are implying a single two wire circuit supplying a parallel bank of LED lights supplied from a 208 voltage source.

    208 implies a 3 phase wye source with 3 hot wires relative to ground, and one neutral with about 0 V to ground.

    At 208 V how much current does one LED draw?
    How many LEDs on this circuit?

    What are your three phase voltages to neutral?
    What is the neutral to ground voltage? Use a screwdriver in the earth somewhere and a high impedance meter.

    My guess is that you have a resistive short to ground or neutral on the high current leg that is drawing a good portion of your high current. More information would have been useful.


  3. #3
    Join Date
    Dec 2012
    Placerville, CA, USA
    Screw or nail through cable?

    Use a clamp ammeter to find where the current is going.

    Sent from my XT1585 using Tapatalk

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