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120v vs 240v breakers

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  • 120v vs 240v breakers

    hey there!

    i am planning on installing an electric floor heating mat. i ran a little software telling me that i will be needing 240 to feed this sucker.

    now, i do have spare room in the load center for 6 breakers and i have 1 spare breaker (not installed).

    the requirements for the mat is 15A 240v. my spare breaker is rated 15A 120/240v. how do i get 240v out of a 120/240v breaker?

    do i have to put 2 x 15A breakers in the panel, the load going to one and the neutral to the other breaker (like a beefy range 30A breaker) or do i simply put 1 breaker, neutral red to the neutral bar and the black load to the breaker?

    thanks!

  • #2
    Re: 120v vs 240v breakers

    Originally posted by HornyPotter View Post
    hey there!

    i am planning on installing an electric floor heating mat. i ran a little software telling me that i will be needing 240 to feed this sucker.

    now, i do have spare room in the load center for 6 breakers and i have 1 spare breaker (not installed).

    the requirements for the mat is 15A 240v. my spare breaker is rated 15A 120/240v. how do i get 240v out of a 120/240v breaker?

    do i have to put 2 x 15A breakers in the panel, the load going to one and the neutral to the other breaker (like a beefy range 30A breaker) or do i simply put 1 breaker, neutral red to the neutral bar and the black load to the breaker?

    thanks!
    From what I just read, you better call an electrician!

    Comment


    • #3
      Re: 120v vs 240v breakers

      Originally posted by Pipestone Kid View Post
      From what I just read, you better call an electrician!

      What he said!!

      Comment


      • #4
        Re: 120v vs 240v breakers

        Neither!

        a 2 pole 15A 120/240v breaker does the job!

        thanks to all for reading!

        cheers!

        Comment


        • #5
          Re: 120v vs 240v breakers

          YIKES!...someone must have posted an answer on another website...and off he goes.....

          Comment


          • #6
            Re: 120v vs 240v breakers

            I wonder how he hooked up the wires?

            Comment


            • #7
              kid

              who cares. breid..............

              Comment


              • #8
                Re: 120v vs 240v breakers

                people of little faith... red to breaker slug, black to the other slug of the breaker. no white.

                how did i find out? cracked open the the load center, checked other 240v breakers, mimic what i saw and bingo... 240v!

                saw the answer on another site? nah... did not bother going to any other site... such a good crowd here.

                i wish you all a nice jolt of 240v!

                back to you in the studio

                Comment


                • #9
                  Re: 120v vs 240v breakers

                  Originally posted by Chemeng View Post
                  YIKES!...someone must have posted an answer on another website...and off he goes.....
                  They're running with scissors out there. It's scary.
                  "When we build let us think we build forever. Let it not be for present delight nor for present use alone. Let it be such work that our descendants will thank us for, and let us think, as we lay stone upon stone, that a time is to come when these stones will be held sacred because our hands have touched them, and that men will say, as they look upon the labor and wrought substance of them, "See! This our fathers did for us."
                  John Ruskin (1819 - 1900)

                  Comment


                  • #10
                    Re: 120v vs 240v breakers

                    I thought you only had one space available? If that's true and you installed a twin breaker (Murray MP1515 or equivalent), then you only have 110V. In order to get 220V, you need each pole to come from a separate phase and with a twin breaker, both are fed by the same phase....
                    Ideal Plumbing

                    Comment


                    • #11
                      Re: 120v vs 240v breakers

                      Originally posted by HornyPotter View Post
                      people of little faith... red to breaker slug, black to the other slug of the breaker. no white.

                      how did i find out? cracked open the the load center, checked other 240v breakers, mimic what i saw and bingo... 240v!

                      saw the answer on another site? nah... did not bother going to any other site... such a good crowd here.

                      i wish you all a nice jolt of 240v!

                      back to you in the studio
                      What better way to learn electrical work. Simply copy what's already there.

                      Comment

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