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Can (3) 6-20r 20 amp 208v Duplex Receptacles be on a 60 amp circuit?

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    Can (3) 6-20r 20 amp 208v Duplex Receptacles be on a 60 amp circuit?

    Can (3) 6-20r 20 amp 208v Duplex Receptacles be on a 60 amp circuit or is the breaker/circuit limited to the maximum amperage rating of the receptacle (20 amp)? Thanks

    #2
    The latter; everything must be protected at their ampacity. . If you have three large loads away from the source, consider a sub-panel.

    Hmmm. Maybe you can wire them on a single three-wire 20a circuit. What are the loads?
    Master Electrician
    Electrical Contractor
    Richmond, VA

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      #3
      Thanks! The load will be 18 amps per duplex receptacle (server computers plugged into outlet). The idea was reduce the number of circuits/wire runs. Thanks

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        #4
        But a multiwire branch circuit would have a common trip breaker, could not turn off just one receptacle.
        Moderator-Washington State
        Ancora Imparo

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          #5
          Look at 210.21 and the tables in that section
          They say I shot a man named Gray and took his wife to Italy
          She inherited a million bucks and when she died it came to me
          I can't help it if I'm lucky

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            #6
            Originally posted by Dennis Alwon View Post
            Look at 210.21 and the tables in that section
            Does it matter that this isn’t a small appliance branch? It is an industrial classification with a known amperage of each plug (i.e. it is not a general use plug)
            Last edited by cottora; 11-14-19, 08:09 PM.

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              #7
              Originally posted by cottora View Post

              Does it matter that this isn’t a small appliance branch? It is an industrial classification with a known amperage of each plug (i.e. it is not a general use plug)
              I think using duplex receptacles like this makes them "general use " since anybody can plug something else into the receptacle. So if you can live with a common trip breaker you are talking about pulling three #12s. Can't get any easier than that.

              -Hal

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                #8
                Originally posted by hbiss View Post

                I think using duplex receptacles like this makes them "general use " since anybody can plug something else into the receptacle. So if you can live with a common trip breaker you are talking about pulling three #12s. Can't get any easier than that.

                -Hal
                There are 400 receptacles... we are talking about reducing the wiring/breakers/circuits by hundreds.

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                  #9
                  Umm, your OP said 3 receptacles.

                  So these bit coin miners require 400 receptacles? You are looking at some serious distribution/ feeder/sub panel design work and installation. The least of your problem is how may conductors to the receptacles.

                  -Hal

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                    #10
                    Originally posted by hbiss View Post
                    Umm, your OP said 3 receptacles.

                    So these bit coin miners require 400 receptacles? You are looking at some serious distribution/ feeder/sub panel design work and installation. The least of your problem is how may conductors to the receptacles.

                    -Hal
                    The OP was referencing one of many circuits (they are all the same layout). Yes, we are getting 1MW service and have substantial cost in transformers/panels. But every little thing adds up and we have limited space.

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                      #11
                      Originally posted by hbiss View Post

                      I think using duplex receptacles like this makes them "general use " since anybody can plug something else into the receptacle. So if you can live with a common trip breaker you are talking about pulling three #12s. Can't get any easier than that.

                      -Hal
                      I'm not saying what the OP wants to do is correct, but I don't think 2-pole 208-250V receptacles would be a "general receptacle", especially with 6-20R receptacles.
                      [COLOR=navy]If you aim at nothing, you will hit it every time![/COLOR]

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                        #12
                        Originally posted by cottora View Post
                        Thanks! The load will be 18 amps per duplex receptacle (server computers plugged into outlet).
                        If the loads are sufficiently linear and identical, then I believe (3) 18 amp L-L loads wired in a delta would put 18 * sqrt(3) = 31 amps on each conductor of a 3-wire circuit. That seems like a problem, unless you can easily put a 20A OCPD at each receptacle.

                        Cheers, Wayne


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                          #13
                          Originally posted by cottora View Post
                          Thanks! The load will be 18 amps per duplex receptacle (server computers plugged into outlet). The idea was reduce the number of circuits/wire runs. Thanks
                          This sounds like a continuous load. The max continuous load on a 20 amp circuit is 16 amps.

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                            #14
                            Have you looked into commercial PDUs? At the scale you are discussing you can probably get some custom ones made tailored to your requirements. For example something with a 100A 3ph input and 6x 2P 20A circuits (or 12x breakers to deal with continuous load) Are the computers in 19" racks or on shelves? Any reason youre not using 240/415v? That would cut the number of branch breaker poles in half (plus the other obvious benefits)

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                              #15
                              Originally posted by Little Bill View Post

                              I'm not saying what the OP wants to do is correct, but I don't think 2-pole 208-250V receptacles would be a "general receptacle", especially with 6-20R receptacles.
                              Any time I see a duplex receptacle I consider it to be for general use. Especially when they are all over the place.

                              Maybe for a lot of European equipment.

                              -Hal

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