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Thread: 3 phase rod oven converted to single

  1. #1
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    3 phase rod oven converted to single

    Is it possible to take a 3’phase rod oven and convert to single phase? Anybody ever did this?

  2. #2
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    Re: 3 phase rod oven converted to single

    What rod oven is 3 phase?

  3. #3
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    Re: 3 phase rod oven converted to single

    Phoenix, keen and most others that can handle more than a few hundred pounds had options of being 3 phase.

    Should be a halfway simple change to rewire it for single.... although maybe not 100 percent UL approved

  4. #4
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    Re: 3 phase rod oven converted to single

    Would probably need to change the heating element and may need to change the thermostat as well.

  5. #5
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    Re: 3 phase rod oven converted to single

    If it is currently hooked up 3 phase Delta you are going to have almost 100 percent more current draw if you hook it up, single phase. The heaters should be the same but all the supply wiring will be 100 percent too small. If the thermostat works a contactor the thermostat will be ok but the contactor will be too small more than likely unless it is really low current and the thermostat is the contactor.

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    Sincerely,

    William McCormick
    If I wasn't so.....crazy, I wouldn't try to act normal, and you would be afraid.

  6. #6
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    Re: 3 phase rod oven converted to single

    I purchased one, Phoenix 300 for $150. Tag read 3 phase. But it was wired single phase 220, it had 2 elements inside. It works great.


    Sent from my iPhone using Tapatalk

  7. #7
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    Re: 3 phase rod oven converted to single

    Quote Originally Posted by William McCormick View Post
    If it is currently hooked up 3 phase Delta you are going to have almost 100 percent more current draw if you hook it up, single phase. The heaters should be the same but all the supply wiring will be 100 percent too small. If the thermostat works a contactor the thermostat will be ok but the contactor will be too small more than likely unless it is really low current and the thermostat is the contactor.

    Sincerely,

    William McCormick
    Probably pretty easy to do. The extra amperage changing to single phase probably not going to affect the wire size or contactor/thermostat amperage rating as the load is so low on both scenarios that neither would be likely to have less rating than either needs. Almost all contactors or any switches for that matter are going to be rated high enough. Even #16 gauge wire would be enough and most contacts going to be at least a 20 amp rating especially if serving resistance type of loads.

    Can't see them using smaller wire than 16 gauge in a industrial rod oven and anything with contacts is almost certainly 20amp at the bare minimum both of which should still be enough whether it is 3 phase or converted to single phase.

    Cheap ole' water heater thermostat is rated for about 40 amps. Most definite purpose contactors start at 30 rating and go up from there.

    You would want to use 240 volt for calculations as Delta is 240 usually as well as 240 for the single phase. Not many 220 volt system in the US.

  8. #8
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    Re: 3 phase rod oven converted to single

    Quote Originally Posted by danielplace View Post
    Probably pretty easy to do. The extra amperage changing to single phase probably not going to affect the wire size or contactor/thermostat amperage rating as the load is so low on both scenarios that neither would be likely to have less rating than either needs. Almost all contactors or any switches for that matter are going to be rated high enough. Even #16 gauge wire would be enough and most contacts going to be at least a 20 amp rating especially if serving resistance type of loads.

    Can't see them using smaller wire than 16 gauge in a industrial rod oven and anything with contacts is almost certainly 20amp at the bare minimum both of which should still be enough whether it is 3 phase or converted to single phase.

    Cheap ole' water heater thermostat is rated for about 40 amps. Most definite purpose contactors start at 30 rating and go up from there.

    You would want to use 240 volt for calculations as Delta is 240 usually as well as 240 for the single phase. Not many 220 volt system in the US.
    Yea it is true, today most single phase 240 is ouputting that and then some. But many heaters are still manufactured and stamped 220 volts.

    Sincerely,

    William McCormick
    If I wasn't so.....crazy, I wouldn't try to act normal, and you would be afraid.

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