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grounding

Discussion in 'Misc Electronics' started by Allan Adler, Jan 17, 2005.

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  1. Allan Adler

    Allan Adler Guest

    I have a device that comes with an AC adaptor, with the following description
    (whatever it all means):
    AC ADAPTOR
    CORD CONNECTED CLASS 2 POWER UNITS
    MODEL: TEAD-57-122000U
    INPUT: 120VAC 60Hz 36W
    OUTPUT: 12VDC 2A
    UL LISTED 4G38 E159614(T)

    Then some diagram and MADE IN CHINA.

    To me, it looks like a perfectly ordinary 2-prong adaptor. The instructions
    for the device that uses it (a shop machine with motors that run off the
    adaptor) say that it is important to ground it and that one needs to purchase
    a 3-prong adaptor and shows pictures of how it fits into a 3-prong wall socket.

    I've done that in the past when I've connected stuff directly to wall sockets.
    There is usually a screw or something that one can use to connect a lead
    coming out of the 3-prong adaptor. However, at the moment, I want to
    plug it into a power strip and there is nothing to connect the lead
    wire to. So I'm not sure what to do.

    Normally I wouldn't worry about it. I would just plug the 2 prong adaptor
    into the power strip and forget about the third hold. But I'm trying to
    do this as carefully as possible, including confronting possibly unnecessary
    details that might turn out to matter. So, with apologies in advance for
    what is undoubtedly the dumbest question of the new year so far, can someone
    please explain how to make sure the thing is properly grounded under these
    circumstances?
     
  2. Jamie

    Jamie Guest

    just use a water pipe, screw on the outlet box etc and connect it
    directly to the metal case of the equipment.
     
  3. Richard

    Richard Guest

    That sounds like "boilerplate", sometimes inappropriate, lawyer-driven,
    statements that are stuck on all products. It doesn't seem to have any
    applicabilty to your device. If you are a worrier just ground the damn
    machine and get on with it.
    Richard
     
  4. Allan Adler

    Allan Adler Guest

    That was also my impression. Thanks for confirming it.
     
  5. Guest

    Better yet, next time you're in Home Depot or wherever, see if such an
    adapter is even available! There is no reason for anyone to even make
    such a thing.

    Richard is right, it sounds like some legal-driven requirement. If it
    really required grounding, they would need to make it with a grounding
    prong.
     
  6. Allan Adler

    Allan Adler Guest

    It's an old habit from using learning programming languages. I tried
    to quit a couple of times, but it's really tough.

    In this case, the device is an 8-in-3 multipurpose machine from
    Harbor Freight, model 40102.
    http://www.harborfreight.com

    It arrives in a (cardboard box containing a) styrofoam box and is nearly
    completely disassembled into almost 100 types of parts and this astonishingly
    misleading manual is the only clue you get on how to put them together.
    Some parts seem to be mislabeled and at least one part number seems
    not to be represented. There is an exploded diagram of the box and
    its contents in the manual, but due to aliasing errors, it is almost
    impossible to use it to identify anything. Thus, even determining which
    part numbers are represented has been a major undertaking.

    On the other hand, it costs $200 (including S&H), which is cheap compared
    with what lathes and milling machines cost, and even though it is clearly
    just a toy, I think I'll be happy with it if I can just get it to work.
    I've put together the jig saw and the wood lathe, but some details
    of the metal lathe have me stumped, and there are several other
    machines I still haven't built from the kit.

    The main problem with the metal lathe is making sense of how one attaches
    the tool to the cross slide. Otherwise, it is completely built.

    In spite of these difficulties, I'm finding the experience pretty educational.

    I can't post to rec.crafts.metalworking about it because:
    (1) I am undoubtedly the only person on the group who has ever demeaned himself
    to such an extent as to use this toy, hence people will be asking me about
    it rather than the other way around.
    (2) I promised that I wouldn't post to the group until I had built something,
    however small or crappy. It seems that the long discussions I was having
    in the hopes of getting a better set of inexpensive machine tools
    provoked some judgmental heckling that made it necessary for me to
    prove I was really interested in doing some metalworking. So, I'm
    proving it. This is no reflection on rcm, which I think is one of
    the best newsgroups in USENET by practically every standard I can
    apply, and I'm looking forward to getting active in it again.
     
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