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Thread: UL Question

  1. #1
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    UL Question

    I'm looking at a plastic switch plate cover, and it has the little UL symbol.

    What about device screws, are they UL approved as well ?
    What if I take out the short screws, and install 3" long screws for a marble back splash? Do I need to get UL approved screws ?

  2. #2
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    You don't have to worry about the screws but if your box is that far back you will need a box extender of some type.

    Roger
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    I'm not worried, I'm curious .......

  4. #4
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    Quote Originally Posted by spark master View Post
    I'm not worried, I'm curious .......
    Well to ease your mind ground screws aren't even listed.

    Note, UL doesn't approve anything, they simply list or recognize items.

    Roger
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    Quote Originally Posted by spark master View Post
    I'm looking at a plastic switch plate cover, and it has the little UL symbol.

    What about device screws, are they UL approved as well ?
    What if I take out the short screws, and install 3" long screws for a marble back splash? Do I need to get UL approved screws ?
    I think you can no longer use something like a drywall screw for such extensions, which works pretty conveniently with plastic boxes, has to be machine thread screw, this would be from NEC

  6. #6
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    So they list a plastic non-conductive wall plate cover, but they don't list screws ???

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    Quote Originally Posted by spark master View Post
    non-conductive
    Exactly.

  8. #8
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    UL logo is stamped between threads, you need a magnifying glass to see it

  9. #9
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    Quote Originally Posted by spark master View Post
    I'm looking at a plastic switch plate cover, and it has the little UL symbol.
    Sorry, edit to say I misread the OP.

    Switch plate covers supplied screws are probably part of the listing.

    Device screws, supplied with the device are also probably tested and evaluated with the device under it's rating.

    However, I agree that most "fasteners" are not listed by a NRTL. The classic example has already been given above . . . the lowly ground screw for enclosures is not listed, nor does it have to be colored
    Last edited by jumper; 07-01-17 at 12:51 PM. Reason: fix quote
    Another Al in Minnesota

  10. #10
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    Quote Originally Posted by al hildenbrand View Post
    Quote Originally Posted by spark master View Post
    I'm looking at a plastic switch plate cover, and it has the little UL symbol..
    Sorry, edit to say I misread the OP.

    Switch plate covers supplied screws are probably part of the listing.

    Device screws, supplied with the device are also probably tested and evaluated with the device under it's rating.

    However, I agree that most "fasteners" are not listed by a NRTL. The classic example has already been given above . . . the lowly ground screw for enclosures is not listed, nor does it have to be colored
    If said screws are critical to the listing, they should be mentioned in the white book shouldn't they?
    Last edited by jumper; 07-01-17 at 12:53 PM. Reason: fix quote

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