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Thread: Possible loose neutral issue

  1. #11
    Join Date
    Jun 2018
    Location
    Arcata, CA, USA
    Posts
    47
    Did you verify that neutral is not bonded to ground at the subpanel in the garage or anywhere else but the main panel?

    As long as that's not the case I would be asking for The Beast too and expect you'll find a weak ground or neutral bond at the meter.


    Quote Originally Posted by dhalleron View Post
    Long story, so pass if you're not in for a long read.

    Probably a ton of posts on this but anyways...

    My neighbor has a 1950s house with a 60 amp service. Someone replaced the panel with a 100 amp main breaker panel.

    Neighbor told me the lights were blinking when the central air came on. They wanted the top half of the service upgraded anyway and I assumed that would fix it. I never actually saw any blinking.

    After I upgraded top half of service to 100 amps they said lights still blinked. I did find a loose wirenut on the hot side in one box that caused a living room lamp to blink when I moved the wirenut. Didn't fix the issue.

    At the main breaker I measure right at 240 volts and 120 to both neutrals. At the living room lamp I measured 117 volts. When we turned on microwave oven the voltage went up to 119 volts. Didn't check to see if they were on opposite phases or not.

    The garage is on it's own 2 pole 30 amp circuit with a sub panel. They tell me lights blink there too but I didn't see it.

    I'm thinking since blinking is on different circuits and all connections at panel and meter are tight, it must be a power company issue. Will be calling them tomorrow.

    Anything different I should have done? Any magic blinking light troubleshooting techniques I need to be aware of?

    Thanks for reading.





    Sent from my SM-G930V using Tapatalk

  2. #12
    Join Date
    May 2018
    Location
    Boyertown, PA, USA
    Posts
    53
    Quote Originally Posted by Redwood Infrared View Post
    Did you verify that neutral is not bonded to ground at the subpanel in the garage or anywhere else but the main panel?

    As long as that's not the case I would be asking for The Beast too and expect you'll find a weak ground or neutral bond at the meter.
    A poor or missing neutral connection will cause lights to dim and brighten, for as long as a significant 120v load is present. The OP's condition was lights that briefly dimmed when the 240v AC started. 240v loads don't utilize the neutral and do not have any effect if the neutral is weak or missing.

  3. #13
    Join Date
    Nov 2007
    Location
    Louisville, KY
    Posts
    438
    Since I cleaned the corrosion I found under the lugs of the main breaker 2 days ago they tell me the blinking and dimming has stopped.

    Sent from my SM-G930V using Tapatalk
    Dale

  4. #14
    Join Date
    Oct 2007
    Location
    New Jersey
    Posts
    5,706
    Quote Originally Posted by dhalleron View Post
    Since I cleaned the corrosion I found under the lugs of the main breaker 2 days ago they tell me the blinking and dimming has stopped.

    Sent from my SM-G930V using Tapatalk
    Sounds like "mission accomplished".

  5. #15
    Join Date
    Nov 2007
    Location
    Louisville, KY
    Posts
    438
    Sometimes I make things seem harder than they are.

    They have honey bees, so for my extra effort I am getting some local honey. I wouldn't take extra money because I should have caught the original problem during the service upgrade.
    Quote Originally Posted by gadfly56 View Post
    Sounds like "mission accomplished".
    Sent from my SM-G930V using Tapatalk
    Dale

  6. #16
    Join Date
    May 2018
    Location
    Boyertown, PA, USA
    Posts
    53
    Quote Originally Posted by dhalleron View Post
    Sometimes I make things seem harder than they are.

    They have honey bees, so for my extra effort I am getting some local honey. I wouldn't take extra money because I should have caught the original problem during the service upgrade.

    Sent from my SM-G930V using Tapatalk
    Sweet!!!

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