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Thread: Lost one leg of 50 amp but came back on

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    Lost one leg of 50 amp but came back on

    I lost one leg of AC power but it returned by itself.
    pedestal power was good. Progressive surge
    protector showed no errors. I reset all the breakers, reset the pedestal nothing came back on, decided well I guess I'll have to wait for someone to come out tomorrow. While watching TV in the bedroom, after about 10 minutes, all the power just came back on by itself. I know i lost a leg because Air conditioner down stairs did not turn on. I still have a issue not being able to disconnect the 90 degree adapter from the input power receptacle. I have one coming in Friday and will change it just in case it overheated and melted together. Other than that any ideas? Converter maybe loosing a leg? Does it have a reset function? The power flickered on and off a couple of times before shutting off completely. I had a toaster oven and an icemaker running at the same time. Never had issues in the past though.


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    Re: Lost one leg of 50 amp but came back on

    Been 20 minutes or so, everything still on. Weird, and now that i think about it, Tuesday morning. Coffea maker and fireplace was off when i got up to go to work. While checking GFCI in downstairs bathroom everything came on by itself.


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    Moderator danemayer's Avatar
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    Re: Lost one leg of 50 amp but came back on

    First, I assume when you say "Progressive Surge Protector", that you mean "EMS" with protection against low voltage, open neutral, etc.

    Second, where is your Progressive EMS located? I'm guessing it's a portable unit located at the pedestal. If that's correct, I'd think the primary things to look at are the shore power connection to the trailer, and the back side of the main circuit breaker panel inside.

    If you have generator prep, shore power also goes through an automatic transfer switch and that could be a point of failure.

    The Power Converter changes 120V AC into 12V DC and wouldn't explain a loss of 1 leg of AC power.

    Our owner-written Electrical User Guide has photos, drawings, and explanations of how things go together. You may find it helpful in running down the problem.


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    Re: Lost one leg of 50 amp but came back on

    Yes, EMS. Everything looked good at the EMS. After verifying no faults. I plugged directly into the pedestal, same thing. Crazy thing is, why did it come on by itself? At fist i thought it was the GFCI outlet. But when it wouldn't trip or reset I pulled it and found no power at the wires to the outlet. Thats when i tried to turn on the downstairs AC. Nothing, would not turn on. If the power inlet looks good. I will have to pull the main panel. Also, EMS is a portable unit and no generator prep.


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    Senior Member mlpeloquin's Avatar
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    Re: Lost one leg of 50 amp but came back on

    Connection is loose and may cause a fire do to high resistance. Make contact and then not and then does is a big safety problem. This is a must track down and find root cause ASAP fault.
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    Re: Lost one leg of 50 amp but came back on

    I will leave down stairs AC off. And all other items drawing power from that leg until tomorrow. But, the big question is why did it come back on by itself?


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    Moderator danemayer's Avatar
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    Re: Lost one leg of 50 amp but came back on

    Quote Originally Posted by farside291 View Post
    I will leave down stairs AC off. And all other items drawing power from that leg until tomorrow. But, the big question is why did it come back on by itself?
    As Marc said, there's a loose wire. Sometimes it makes contact enough to run things. Sometime the contact breaks. It is a high priority to get it corrected.


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    Re: Lost one leg of 50 amp but came back on

    Quote Originally Posted by farside291 View Post
    I lost one leg of AC power but it returned by itself.
    pedestal power was good. Progressive surge
    protector showed no errors. I reset all the breakers, reset the pedestal nothing came back on, decided well I guess I'll have to wait for someone to come out tomorrow. While watching TV in the bedroom, after about 10 minutes, all the power just came back on by itself. I know i lost a leg because Air conditioner down stairs did not turn on. I still have a issue not being able to disconnect the 90 degree adapter from the input power receptacle. I have one coming in Friday and will change it just in case it overheated and melted together. Other than that any ideas? Converter maybe loosing a leg? Does it have a reset function? The power flickered on and off a couple of times before shutting off completely. I had a toaster oven and an icemaker running at the same time. Never had issues in the past though.

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    Re: Lost one leg of 50 amp but came back on

    At the earliest opportunity I would disconnect all power and tighten everything in the distribution panel and your transfer switch. Power cord reel if you have one.
    a couple of years ago I had a similar problem and I found my hot 1 going into my transfer switch was actually bouncing on the outer edge of the terminal. I had to tighten everything up since then no problems and I did find loose wires in the distribution panel.

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    Re: Lost one leg of 50 amp but came back on

    Quote Originally Posted by hoefler View Post


    I think you have your answer already
    Fixed it! 90 degree Camco adapter. Thank you everone for your help.20191107_160119.jpg


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