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Thread: Home made transfer switch

  1. #1
    Join Date
    Jul 2007
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    Eatonton, Georgia
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    1,127

    Home made transfer switch

    I have installed several generator transfer switches made for 6.5 kw . They are close to $400.00 with tax . A customer I have installed one for wants small 2.2 k gens installed on 2 other locations on property. The prob is the 6.5 kw switch is smallest for sale locally. I hate for the customer to have to buy two of these for small gens. My question is why cant several 3 way switches be used for this. The common goes to the load and one terminal to breaker and other terminal to gen . I have no doubt will work because have done it before on a camper and thats whats inside a tran switch. But im sure code says something about equiptment must be approved for application on trans switch ?

  2. #2
    Join Date
    Nov 2006
    Location
    nh
    Posts
    473
    they can but it wont be listed or labeled therefor not acceptable
    then theres the insurance co....can you say liability...::cool:

  3. #3
    Join Date
    Mar 2006
    Location
    Tampa Florida
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    8,009
    And just what would your price be for lets say 3 of these switches installed per code ?There are cheap ways out now days that use the main panel with a back feed breaker with lockout.Keep in mind that they need to be listed for use

  4. #4
    Join Date
    Feb 2003
    Location
    Wisconsin
    Posts
    8,580
    UL does not test "standard" 3-way switches for switching between two different power sources. I believe that Hubbell even warns against this in their technical literature.
    Just because you can, doesn't mean you should.

  5. #5
    Join Date
    Mar 2007
    Location
    Southern Illinois
    Posts
    258
    I have seen a small Square D transfer switch new on Ebay for about 125-150. I havn't seen any available locally.

    Jeff

  6. #6
    Join Date
    Jul 2007
    Location
    Iowegia
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    16,796
    Quote Originally Posted by ElectricianJeff
    I have seen a small Square D transfer switch new on Ebay for about 125-150. I havn't seen any available locally.Jeff
    Last I saw, Home Depot was selling those panels for about $180, but I don't know if they do any more.
    You can make your own with a Square D QO MLO panel, two 2-pole breakers, and Square D part # QO2DTI. It's the same mechanism Square D puts in their "Generator Transfer Switch" panels. They're about 8 bucks at the supply house. And yes, it is break-before-make.

    You can see the mechanism on the two top-right breakers in this photo I took of the last panel I installed.

    Last edited by 480sparky; 08-01-07 at 08:24 AM.

  7. #7
    Join Date
    Aug 2007
    Posts
    1
    Try one of these.

    http://www.generatorjoe.net/product....9&1=466&3=1055

    I installed one very similar a few years back and it seemed pretty slick.
    The built-in twist lock feed point is nice too.

  8. #8
    Join Date
    Mar 2007
    Location
    Southern Illinois
    Posts
    258
    Quote Originally Posted by 480sparky
    Last I saw, Home Depot was selling those panels for about $180, but I don't know if they do any more.
    They don't....at least here they don't. When I asked the counter guy about it he told me that HD elected not to sell them anymore because they exceed the scope of what the typical DIY'er could safely install. I found the respnse interesting considering all the other stuff they sell.

    Jeff

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