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    taz2444's Avatar
    taz2444 Posts: 3, Reputation: 1
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    #1

    Aug 30, 2010, 03:39 PM
    Hard wiring a 240 heater with only two available connection wires (L1 & L2)
    I'm trying to connect an older sears heater to new sub panel in my shop. The new breaker wiring has a red, black, white and bare ground set of wires. The heater has 4 wires available to be connected to my power source & thermastat. These wires include two that are thicker than the other two and these two sets of thick and thin heater wires are labeled L1 & L2 (thicker set) and T1 & T2 (thinner set) I'm assuming the T1 & T2 thin wires are connected to my thermastat and the L1 & L2 wires are to be connected in some order to the Red/Black and White wires. Help will be greatly appreciated-thanks,rg
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
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    #2

    Aug 30, 2010, 03:57 PM

    L1 & L2 are the two hot lines from panel the to the thermostat.
    T1 & T2 are the switched wires from the thermostat to the heater element.
    There is no (white) neutral in this circuit.
    taz2444's Avatar
    taz2444 Posts: 3, Reputation: 1
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    #3

    Aug 30, 2010, 04:08 PM

    Which wires of the red, black, white and ground do I connect to the L1 & L2. Do I just connect the ground wire to the body of the heater?
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
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    #4

    Aug 30, 2010, 04:22 PM
    Quote Originally Posted by taz2444 View Post
    which wires of the red, black, white and ground do I connect to the L1 & L2.
    To be honest it concerns me that you even have to ask this.
    Typically in a circuit like this with a neutral the black and red are the hots. You would just cap off the white. Use a tester to confirm this.
    If you have a cable with only black and white they would both be the hots.



    Quote Originally Posted by taz2444 View Post
    Do I just connect the ground wire to the body of the heater?
    Basically, yes.
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    taz2444 Posts: 3, Reputation: 1
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    #5

    Aug 30, 2010, 04:47 PM

    Thanks for the concern. I'll cap the white and attach the red and black to L1 & L2 and attach the ground to the metal body of the heater. I already have connected the thermastat to the T1 & T2. If that sounds correct, I'll switch the breaker from off to on. Thanks again, rg
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