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Do breakers ever get "weak"

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    #16
    Originally posted by electrofelon View Post
    I could see that, but what isn't clear to me is how the mag function would go bad to make it trip early.
    I see mechanical wear being a bigger issue that may affect mag function, could make it trip easier or could make it need higher mag field to make it trip, depends on what/how an item wears out.
    I live for today, I'm just a day behind.

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      #17
      Originally posted by electrofelon View Post
      I could see that, but what isn't clear to me is how the mag function would go bad to make it trip early.
      That would more likely be from mechanical wear from being used daily as a switch rather than just age.

      Sent from my XT1585 using Tapatalk

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        #18
        Originally posted by GoldDigger View Post
        That would more likely be from mechanical wear from being used daily as a switch rather than just age.

        Sent from my XT1585 using Tapatalk
        And could make it trip at higher or lower fault current depending on wear conditions I would think, or at very least affect clearing time compared to when it was new.
        I live for today, I'm just a day behind.

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          #19
          Too Many....

          Originally posted by LarryFine View Post
          FOP = Fall Of Potential

          It means measuring the voltage between the line and load terminal of one pole at a time. You're looking for voltage drop where there shouldn't be any. In theory, there should be zero volts across a closed switch or breaker.

          I would check the line current with a clamp-on ammeter.
          There are TOO MANY, WAY TOO MANY ACRONYMS, and they are becoming bothersome for this reason. There are other aspects about them which make them even more distasteful that there is no need to go into. Some of the exact same ones cross over into completely different trades and mean different things.
          There needs to be as master list on the forum possibly.
          Microwave Radiation Dangers should be openly discussed

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            #20
            Originally posted by StarCat View Post
            There are TOO MANY, WAY TOO MANY ACRONYMS, and they are becoming bothersome for this reason. There are other aspects about them which make them even more distasteful that there is no need to go into. Some of the exact same ones cross over into completely different trades and mean different things.
            There needs to be as master list on the forum possibly.
            Good point, especially since I would not use FOP to describe what I would call a voltage drop test across the terminals of the breaker.

            When I hear Fall of Potential used, I pretty much instantly think about grounding electrode resistance tests.
            Cheers and Stay Safe,

            Marky the Sparky

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              #21
              Originally posted by K8MHZ View Post
              Good point, especially since I would not use FOP to describe what I would call a voltage drop test across the terminals of the breaker.

              When I hear Fall of Potential used, I pretty much instantly think about grounding electrode resistance tests.
              I'm other way around, done many more FOP tests across a switch, breaker, etc. than for grounding electrode testing.
              I live for today, I'm just a day behind.

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                #22
                Originally posted by kwired View Post
                I'm other way around, done many more FOP tests across a switch, breaker, etc. than for grounding electrode testing.
                The test you are doing is what I would call a voltage drop test.

                All the more reason not to use acronyms or initialisms.
                Cheers and Stay Safe,

                Marky the Sparky

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                  #23
                  Originally posted by K8MHZ View Post
                  The test you are doing is what I would call a voltage drop test.

                  All the more reason not to use acronyms or initialisms.
                  Well then it is a VDT

                  But isn't anything indicated on a volt meter a VDT?
                  I live for today, I'm just a day behind.

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