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Thread: THREEPHASE OVERLOADS

  1. December 28th, 2004, 08:50 PM #1
    pilot
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    Post

    HI EVERY ONE!
    I HAVE A QUESTION REGARDING THE REQUIREMENT OF THREE HEATERS ,(ONE ON EVERY PHASE OF THE STARTER) FOR A MAGNETIC RELAY MOTOR STARTER, I HAVE FOUND THAT IN ONTARIO SOME EQUIPMENT I HAVE RUN ACROSS IS PROTECTED ONLY WITH TWO HEATER OVERLOADS,WITH THE MIDDLE ONE JUMPERD OUT. I KNOW THAT THE CANADIAN CODE REQUIRE THREE BUT AM INTERESTED IN FINDING OUT THE NORMAL REQUIREMENTS FOR ONTARIO, IF THEY ARE DIFFERENT.
  2. December 30th, 2004, 11:16 AM #2
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    Lightbulb

    In the late 1960s or early 70s The CEC requirement was changed from 2 heaters to 3.

    What you may be seeing is some older equipment that was installed before the change.

    Ed
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