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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.
                  ---------------
                  Light is faster than sound. That's why some people seem really bright until you hear them speak.
                  ---------------
                  “If I had my life to live over again, I'd be a plumber.” - Albert Einstein
                  ---------
                  "Its a table saw.... Do you know where your fingers are?"
                  ---------
                  sigpic http://www.helmetstohardhats.com/

                  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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