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Line Power for industrial controller

Discussion in 'General Electronics' started by Scott S, Oct 20, 2003.

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  1. Scott S

    Scott S Guest

    I have a question about the practices used in industrial wiring. I
    work with indusrial control systems and often I see industrial panels
    wired with the line power wired "straight through" the enclosure. By
    "straight through" I mean the cord passes through a hole drilled in
    the enclosure. There is strain relief and a metal ring (perhaps for
    EMI and for a good seal) where the cord enters the enclosure. The
    enclosures are usually the water resistant type (NEMA 3 or better) and
    on the male end of the cord is the plug for going into the 110, 220,
    400, or whatever the supply voltage is.

    Does anybody know why this practice is used? I've seen it most in the
    U.S.A. I see that it protects agains accidentally unplugging at the
    enclosure (there is no bulkhead and connector there, but pulling on
    the cord will still unplug it at the plug end. Additionally, I see
    that it could be dangerous if the strain relief failed and the wires
    were pulled out of the terminals inside the panel (possible short).

    Any ideas?

  2. You will notice that most wiring in metal boxes has those bushings on it,
    even in your house. They prevent the wire from moving, without pinching the
    conductor. If you didn't, then among the less desirable results would be
    the insulating being abraded off, and a bit of arcing to the box at that

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