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General use receptacles on 30amp circuits

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    General use receptacles on 30amp circuits

    Why are general use 15 amp receptacles allowed on 20amp circuits but not on 30amp circuits? Is there any risk of doing such?
    Our comedian shamelessly joked about a blackout. Talk about dark humor.

    #2
    Why do 12 and under kids eat for free but not 13 year olds?

    There's not really that big of a size difference at that age.

    Seems someone decided there had to be a cutoff at some point.


    JAP>

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      #3
      Originally posted by jap View Post
      Why do 12 and under kids eat for free but not 13 year olds?

      There's not really that big of a size difference at that age.

      Seems someone decided there had to be a cutoff at some point.


      JAP>
      But why the cutoff? Electrical theory would have an answer.
      Our comedian shamelessly joked about a blackout. Talk about dark humor.

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        #4
        My electrical theory is that 30a requires more metal in the current-carrying parts than 15/20a devices are made with, and OCPDs can't reliably protect the devices from overload damage.
        Master Electrician
        Electrical Contractor
        Richmond, VA

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          #5
          Maybe, in part, because most general use 15 and 20 amp receptacles are listed for 20 amp feed-through? There seems to be some coordination between the NEC and the NRTLs.
          Bob on the left coast.

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            #6
            Originally posted by LarryFine View Post
            My electrical theory is that 30a requires more metal in the current-carrying parts than 15/20a devices are made with, and OCPDs can't reliably protect the devices from overload damage.
            Originally posted by bkludecke View Post
            Maybe, in part, because most general use 15 and 20 amp receptacles are listed for 20 amp feed-through? There seems to be some coordination between the NEC and the NRTLs.
            That might be it then.


            But won't the receptacle itself be protected by overload? I can't see someone plugging in more then 4,600 watts of load let lone approaching that.
            Our comedian shamelessly joked about a blackout. Talk about dark humor.

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              #7
              15a is really a 20a frame with a 15a face.
              The frame would melt on a 30a load after 145yrs.
              Why do we have digital tv when I watch black and white tv shows over the air on a 55" 4K tv? (Because they can't make a good tv show?).
              Why do I need all the DEF anti pollution crap on my truck when it makes the truck get lower fuel mileage, power, and support industry for it adds to pollution?

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                #8
                Originally posted by sameguy View Post
                15a is really a 20a frame with a 15a face.
                The frame would melt on a 30a load after 145yrs.
                Why do we have digital tv when I watch black and white tv shows over the air on a 55" 4K tv? (Because they can't make a good tv show?).
                It might boil down to the terminations. I mean said terminal splits in two, one up one down.
                Our comedian shamelessly joked about a blackout. Talk about dark humor.

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                  #9
                  Originally posted by mbrooke View Post
                  That might be it then.


                  But won't the receptacle itself be protected by overload? I can't see someone plugging in more then 4,600 watts of load let lone approaching that.

                  If the receptacles are daisy chained, the first one's in line will be taking the hit for whatever load is plugged in down stream.

                  JAP>

                  Comment


                    #10
                    Originally posted by jap View Post
                    If the receptacles are daisy chained, the first one's in line will be taking the hit for whatever load is plugged in down stream.

                    JAP>


                    True, there is that one would need to avoid. But say you didn't or couldn't do that with the outlets at hand.
                    Our comedian shamelessly joked about a blackout. Talk about dark humor.

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                      #11
                      So you're asking about a single 15a receptacle on a 30a breaker?

                      To me, that's worse than the same load shared by several receptacles on a 30a circuit.
                      Master Electrician
                      Electrical Contractor
                      Richmond, VA

                      Comment


                        #12
                        Originally posted by LarryFine View Post
                        So you're asking about a single 15a receptacle on a 30a breaker?

                        To me, that's worse than the same load shared by several receptacles on a 30a circuit.

                        No, between several to two dozen 15/20 amp receptacles on a 30 amp circuit.
                        Our comedian shamelessly joked about a blackout. Talk about dark humor.

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                          #13
                          I've got another theory.

                          Because the screw terminals are not rated for the larger wire, and, scabbing on a piece of #12 to a #10 to make it happen would be a code violation.

                          JAP>

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                            #14
                            Are the terminals on a 15a device rated for #10?

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                              #15
                              Originally posted by jap View Post
                              I've got another theory.

                              Because the screw terminals are not rated for the larger wire, and, scabbing on a piece of #12 to a #10 to make it happen would be a code violation.

                              JAP>

                              You don't create one rule to prevent the violation of another- at least I believe that is the intent of the NEC.
                              Our comedian shamelessly joked about a blackout. Talk about dark humor.

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