3 phase plug

  1. jay jay New Member

    Messages:
    2
    Location:
    U.K.
    Can anyone tell me why my kemppi 3 phase mig welder has 5 wires
    three of the black wires go to L1 L2 L3 then the ground and the last black wire are twisted together and are in the ground pin of a 4 pin plug
     
  2. Welderpaul

    Welderpaul Moderator Staff Member

    Messages:
    12,713
    Location:
    Yorkshire
    3 phase, neutral and earth = 5 cores. No neutral required so neutral and earth twisted together. (Assuming they are twisted together in the plug and the machine?)
    Essentially using a 5 core cable when a 4 core cable would do.
     
    Robotstar5 likes this.
  3. jay jay New Member

    Messages:
    2
    Location:
    U.K.
    cheers mate thanks for your help
     
  4. dobbslc

    dobbslc Forum Supporter

    Messages:
    4,412
    Location:
    Hertfordshire UK
    If you've got a spare core ALWAYS earth it.
    You'd be amazed how high the induced voltage can be in a "floating" core.
     
    Welderpaul likes this.
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