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Thread: Sparking neutral to ground ?

  1. #1
    Join Date
    Feb 2006
    Location
    Jersey
    Posts
    2,324

    Sparking neutral to ground ?

    Taking a exterior flood light down to replace fixture with motion LED fixture..
    With the switch off (and probably on too) there are small sparks when neutral contacts to metal grounded box..
    "IF" I were to remedy this, where might I look?

    I'm guessing a (the) circuit using that neutral is finding a better return somehow via that ground through another load?..
    Part of this though is this light outlet is the furthest outlet from the panel in this building.

    If I just through the fixture up and looked the other way, I don't think there would be any problem as the neutral and ground are separate at least at that point.
    " I'm at a crucial part of my painting "...........Monika Danneman

  2. #2
    Join Date
    May 2005
    Location
    Richmond, Virginia
    Posts
    23,723
    Presuming the EGC is at zero volts to earth, the sparks are the result of the neutral not being at zero volts to earth. Normal voltage drop on a normal circuit can cause this. For example, if the line conductor is at five volts below the supply voltage due to normal voltage drop, the neutral will likewise be at five volts above ground.
    Code references based on 2005 NEC
    Larry B. Fine
    Master Electrician
    Electrical Contractor
    Richmond, VA

  3. #3
    Join Date
    Dec 2014
    Location
    pa
    Posts
    19
    shared neutral with load on another phase. Happens all the time

    Sent from my SM-G950U using Tapatalk

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