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  • parin bumia
    parin bumia

    Member • Jan 3, 2014

    TPN isolator and switch

    Where to use TPN switch and TPN Isolator,Moreover y to use it.I Have gr8 confusion regarding the realm of neutral wire.y is it so necessary.
    Plz help.........
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  • J Biswas

    Member • Jan 7, 2014

    TP - 3P switching no N

    TPN - 3P switching with un-protective N (no problem unless the motor winding body to the metal) 😀 - other machines/electronic devices (grounded might get affected otherwise)

    TPNY - Many factories / countries don't allow TPN because of the above reason. Hence independent switching of N is done along with isolation with ground.
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  • J Biswas

    Member • Jan 7, 2014

    We are in the process of designing a system that alarms whenever neutral line is grounded (for 3P motors), work is still in progress.

    - JB -
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