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Thread: E Stop switch

  1. #11
    Join Date
    Mar 2008
    Location
    Michigan. It's a beautiful penninsula, I've looked around.
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    9,243
    Quote Originally Posted by CEDEng View Post
    totally right, bob - the "estop" word has only appeared in responses so far, not from the OP.
    Except for the title and all.
    Cheers and Stay Safe,

    Marky the Sparky

  2. #12
    Join Date
    Aug 2004
    Location
    Northern illinois
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    15,506
    Quote Originally Posted by CEDEng View Post
    totally right, bob - the "estop" word has only appeared in responses so far, not from the OP.
    actually he called it an estop too, but that may just mean it is a big red button.
    Bob

  3. #13
    Join Date
    Apr 2013
    Location
    Kennedy Space Center, Florida
    Posts
    39
    Good Afternoon

    It is an e stop according to the Square D box. It has a break glass button holding contacts open.

    When you break the glass it releases the button making the circuit. It was requested by our fire dept.

    at each door to de-energize the MCC before entry in case of fire. That is the reason for the original install.

    During a PMI it was noticed the contact and screws were rusted and cracking the plastic contact block housing.

    I am replacing the contact block inside the e-stop.

    Our engineer was concerned about the load side wires "IF" anything could happen.

    Thank you everyone for the input.

  4. #14
    Join Date
    Feb 2003
    Location
    Massachusetts
    Posts
    60,020
    For what it is worth the function you describe makes it not an emergency stop. Emergency stops have very specific rules and a shunt trip would not be part of it.

    You are describing what many would call an 'EPO' Emergency Power Off button.

  5. #15
    Join Date
    Apr 2013
    Location
    Kennedy Space Center, Florida
    Posts
    39
    Thank you. I thought as i was reading that i might have the wrong name for the switch itself.

    I changed out the contact block with out indecent so all's well that ends well.

    I appreciate everyone's help.

  6. #16
    HA sheesh you're right - right there in the topic. I only referred to the body, where it wasn't mentioned.

    not enough coffee...too much coffee...old age...hard to say...

    Sounds like you're all resolved, but I agree with what was previously posted: This is an EPO circuit, emergency power off, not an ESTOP. Semantics perhaps, but you'd get very different responses about this if it were indeed an ESTOP.

  7. #17
    Join Date
    Dec 2012
    Location
    Placerville, CA, USA
    Posts
    17,958
    Quote Originally Posted by CEDEng View Post
    HA sheesh you're right - right there in the topic. I only referred to the body, where it wasn't mentioned.
    Post #5 by the OP:
    The chances seem remote that while replacing the e stop switch....

  8. #18
    Well, at this point on March 17 and a Friday - it's too much beer, coffee's not in the equation...

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