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Thread: Panel lock out vs. tran. switch

  1. #1
    Join Date
    Dec 2009
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    Panel lock out vs. tran. switch

    Has anyone had any expeience with the bolt on panel cover lockout kits vs. a transfer switch when using a generator at a residence? Thoughts, concerns?

  2. #2
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    Please excuse my ignorance but what do you mean by "the bolt on panel cover lockout kits" in regards to using a generator at a residence?

    Chris

  3. #3
    Join Date
    Jun 2003
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    No experience with them, but I am aware that the manufacturers make a interlock that can be used to not allow a backfed breaker to be turned on until the main is off.

    One concern is that the interlock can be defeated by removing the interlock (which I think requires removal of the panel cover.)

    From the square D website:

    Standby Power Kit for Load Centers
    These kits install on existing Square D QO and
    Homeline Load Center covers and interlock the main
    circuit breaker with a 125 A maximum breaker back-fed
    from the generator. Up to 30 kW of generator power is
    available to all the circuits in the load center, allowing
    the user flexibility of selecting and changing which
    circuits are to be powered during an outage. These
    mechanical interlocks prevent the dangerous situation
    of back-feeding power onto the utility lines by
    preventing the main breaker and the breaker fed from
    the generator from being “ON” at the same time. Kits
    are available for indoor and outdoor main breaker load
    centers 100 A through 225 A.

    Steve
    Last edited by steve66; 12-06-10 at 04:26 PM.

  4. #4
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    To go along with Steves post, he may be talking about these

    Roger
    Moderator

  5. #5
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    Jun 2003
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    Here is a link to Square D's interlock kit:

    http://static.schneider-electric.us/...1100HO9903.pdf

    For SQD, it looks like its only for 1 or 2 pole breakers.

    Steve

  6. #6
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    I used a Square D one before and it worked fine, was much less expensive and much less labor.

  7. #7
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    Thanks for the links guys.

    I really need to get out more, I have never seen these before.

    Chris

  8. #8
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    Location
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    It is in fact the one in Rogers link, I wasn't sure if it was ok to post the exact make and model. I was thinking this would be cheaper, faster and leave the customer with more flexibility than a transfer switch. I was having concerns about what can happen though if some one removes the cover.

  9. #9
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    Quote Originally Posted by masselectrician View Post
    It is in fact the one in Rogers link, I wasn't sure if it was ok to post the exact make and model. I was thinking this would be cheaper, faster and leave the customer with more flexibility than a transfer switch. I was having concerns about what can happen though if some one removes the cover.
    Other than not as fast as 1 switch it is a very good way to do this.
    I made my own for my CH panel and works fine. Very seldom needed but ready to go.
    Also converted my gen from gasoline to propayne so it is ready to without worry of fresh gas.

  10. #10
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    Quote Originally Posted by masselectrician View Post
    It is in fact the one in Rogers link, I wasn't sure if it was ok to post the exact make and model. I was thinking this would be cheaper, faster and leave the customer with more flexibility than a transfer switch. I was having concerns about what can happen though if some one removes the cover.
    You can only do what is requried. You cannot prevent stupid. As soon as you think it is idiot proof, they make a better idiot.
    Organized people are people that are just too lazy to look for their stuff

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