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Double Pole Electric Base Board with Single Pole Thermostat

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    Double Pole Electric Base Board with Single Pole Thermostat

    Hello All,
    Is it code compliant to install a single pole thermostat on a double pole electric base board heater. If so, is any type of disconnect required? 2014 NEC.

    Thank You


    #2
    Yes, single pole thermostats are allowed on baseboard heaters for control. The two pole circuit breaker is the disconnecting means.
    Tom
    TBLO

    Comment


      #3
      Yes but you would need a breaker lock I believe
      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

      Comment


        #4
        I believe 424.19 is the section to look at.

        424.19(B) Heating Equipment Without Supplementary Overcurrent
        Protection.
        (1) Without Motor or with Motor Not over 1∕8 Horsepower.
        For fixed electric space-heating equipment without a motor
        rated over 1∕8 hp, the branch-circuit switch or circuit breaker
        shall be permitted to serve as the disconnecting means where
        the switch or circuit breaker is within sight from the heater or
        is lockable in accordance with 110.25
        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

        Comment


          #5
          Yup if the stat only breaks one leg it doesn't qualify as the disconnecting means so you'll need one within sight (can be the panel where the circuit originates) or a locking device on the breaker that's not within sight.
          Rob

          Moderator

          All responses based on the 2017 NEC unless otherwise noted

          Comment


            #6
            Thanks All

            Comment


              #7
              You can also get T-stat that breaks one line for control but opens both lines when set to off. Having an off position is the indicator of a T-stat that does so.
              Master Electrician
              Electrical Contractor
              Richmond, VA

              Comment


                #8
                I've only done one line-voltage stat in recent memory. It had an off-position. It only broke one line no matter what it was doing. The other line didn't even pass through it.

                Comment


                  #9
                  Weird.
                  Master Electrician
                  Electrical Contractor
                  Richmond, VA

                  Comment


                    #10
                    I should clarify that it had an "off" position on the temperature dial, but not a separate on/off switch. It was a Honeywell. And it was rated 120/208/240/277.

                    Comment


                      #11
                      Originally posted by infinity View Post
                      Yup if the stat only breaks one leg it doesn't qualify as the disconnecting means so you'll need one within sight (can be the panel where the circuit originates) or a locking device on the breaker that's not within sight.
                      I'm curious if a locking panel door is compliant?

                      ~RJ~

                      Comment


                        #12
                        It is much simpler to get a dp T-stat
                        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

                        Comment


                          #13
                          Originally posted by romex jockey View Post

                          I'm curious if a locking panel door is compliant?

                          ~RJ~
                          No.
                          Rob

                          Moderator

                          All responses based on the 2017 NEC unless otherwise noted

                          Comment


                            #14
                            Originally posted by infinity View Post

                            No.
                            Was this always this way? Or a recent change Infinity?

                            ~RJ~

                            Comment


                              #15
                              Originally posted by romex jockey View Post

                              Was this always this way? Or a recent change Infinity?

                              ~RJ~
                              Here's the 2017 section:

                              110.25 Lockable Disconnecting Means. If a disconnecting
                              means is required to be lockable open elsewhere in this Code, it
                              shall be capable of being locked in the open position. The
                              provisions for locking shall remain in place with or without the
                              lock installed.
                              Exception: Locking provisions for a cord-and-plug connection shall not
                              be required to remain in place without the lock installed.
                              Here's the 2005 section:

                              424.19(B) Heating Equipment Without Supplementary Overcurrent Protection
                              (1) Without Motor or with Motor Not Over 1 / 8 Horsepower For fixed electric space-
                              heating equipment without a motor rated over 1 / 8 hp, the branch-circuit switch or circuit
                              breaker shall be permitted to serve as the disconnecting means where the switch or circuit
                              breaker
                              is within sight from the heater or is capable of being locked in the open position
                              Rob

                              Moderator

                              All responses based on the 2017 NEC unless otherwise noted

                              Comment

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