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Thread: Square D Generator interlock kit

  1. #11
    Join Date
    Mar 2006
    Location
    Westchester County, New York
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    8,221
    I am curious...

    What happens to the interlock function when the cover is removed from the panel to perform maintenance to the panel enclosure?

    Will the breakers still be interlocked?


    Lets say the electrician is working on the panel and removes the cover. In doing so, the interlock is removed as well.
    The electrician steps outside to his truck, something happens to cause the generator to start...what happens then?


    Are these interlocks listed? I did not see any listing in the catalog or SQD's Digest.
    Instructor, Industry Advocate

  2. #12
    Join Date
    Jun 2005
    Location
    Delmarva, USA
    Posts
    1,645
    With the cover removed, you could switch both breakers in the "on" position. This applies to many so-called generator panels, with the external interlocking hardware installed.

    Auto-start generators should not be utilized with manual transfer interlock kits, IMO. :-?

    If one has the funds to purchase and install a gen set with auto-start capacity, they should be able to foot the cost for an ATS.

  3. #13
    Join Date
    Jan 2009
    Location
    Massachusetts
    Posts
    272
    They give you fancy stickers to place on the breaker "warning to keep in off postion while cover is off". It is a manual switch so if generator kicks on it will not back feed unless breaker for gen set is on. I installed this unit with a WP 30 plug for portable generator. In MA we were hit with the Ice storm in early Dec so word around supply house was lots of interlock kits were sold.

  4. #14
    Join Date
    Mar 2006
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    Westchester County, New York
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    The new exception of 702.6 to the '05 NEC would seem to me to eliminate the possibility of using these interlocks.


    Does anyone have a link to show if these interlocks are listed?
    Instructor, Industry Advocate

  5. #15
    Join Date
    Jan 2009
    Location
    Massachusetts
    Posts
    272
    Quote Originally Posted by Pierre C Belarge View Post
    The new exception of 702.6 to the '05 NEC would seem to me to eliminate the possibility of using these interlocks.


    Does anyone have a link to show if these interlocks are listed?
    Try this www.interlockkit.com

  6. #16
    Join Date
    Jun 2005
    Location
    Delmarva, USA
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    1,645
    Quote Originally Posted by Pierre C Belarge View Post
    ....Does anyone have a link to show if these interlocks are listed?
    Click here.

  7. #17
    Join Date
    May 2005
    Location
    Richmond, Virginia
    Posts
    23,696
    Quote Originally Posted by Pierre C Belarge View Post
    What happens to the interlock function when the cover is removed from the panel to perform maintenance to the panel enclosure?
    You beat me to the punch. I was ging to add that I remember reading something that requires the interlock to continue to function without the cover in place.


    Oh, and thank you, by the way. :smile:
    Code references based on 2005 NEC
    Larry B. Fine
    Master Electrician
    Electrical Contractor
    Richmond, VA

  8. #18
    Join Date
    Mar 2006
    Location
    Westchester County, New York
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    Quote Originally Posted by LarryFine View Post
    You beat me to the punch. I was ging to add that I remember reading something that requires the interlock to continue to function without the cover in place.


    Oh, and thank you, by the way. :smile:



    You are welcome.:cool:

    As you have mentioned, I am still wondering/concerned that the device may be listed for one thing, and when installed, the instructions to warn about how to position the breaker would not be sufficient for the purpose of the transfer switch sections of 700, 701, 702.
    Instructor, Industry Advocate

  9. #19
    Join Date
    May 2009
    Posts
    9
    Thanks for all the reply's. I went down to the local supply house and my favorite counter guy found this for me. 25 dollars and it just snaps on the breaker. http://www.eescodirect.com/direct/Pr...oductId=141752

  10. #20
    Join Date
    Mar 2006
    Location
    Westchester County, New York
    Posts
    8,221
    I am still wondering if the interlocks are listed/identified as suitable for permanently installed generators????

    Take a look at 702.6 and the exception
    Instructor, Industry Advocate

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