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Thread: Hot work on UPS equipment

  1. #21
    Join Date
    Dec 2012
    Southern Ca, USA
    Quote Originally Posted by kwired View Post
    It may possibly be considered safe from electric shock hazards, it may still present arc flash hazards.
    You are right on that one. But I do think that touch safe panel construction would reduce the possibility of an accidental flash, like getting across
    terminals or shorting something out.

  2. #22
    Join Date
    Jun 2010
    Interesting fact: Hybrid and EV batteries can have enough fault current to be classified as category IV.

  3. #23
    Join Date
    Sep 2003
    Quote Originally Posted by zbang View Post
    The OP asked about the UPS, and in almost all cases, you can disconnect the batteries from the UPS.
    Not to put too fine a point on it, the OP asked about "UPS equipment," which I took to mean the whole thing, batteries and all. A colleague of mine who works for a company that makes and installs UPS systems once told me he worries about guys who work every day on AC, then are called upon to work on DC and aren't qualified.

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