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Plug a UPS into a surge suppressor, or vice versa?

Discussion in 'Electronic Design' started by John Doe, Jul 24, 2007.

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  1. John Doe

    John Doe Guest

    Are there definitive answers to the questions about which one comes
    first, the surge suppressor or the UPS?

    My understanding is that a UPS can be plugged into a stand-alone surge
    suppressor to add the protection of the surge suppressor, and that a
    surge suppressor can be plugged into a surge suppressor. Is there
    anything wrong with either of those?

    And a surge suppressor should not be plugged into a UPS?

    Thank you.
  2. AZ Nomad

    AZ Nomad Guest

    Unless you think lightening is going to strike between your equipment
    and the UPS, the surge protector goes before the UPS.

    The purpose of it is to clamp down kilovolt spikes on the power line. The
    UPS is going to do that anyway, but MOV's wear out and eventually that
    function of the UPS is going to vanish. A periodically replaced surge
    protector between outlet and UPS will maintain that protection.
  3. John Doe

    John Doe Guest

    Even if the indicator LEDs say it's still providing protection?
  4. AZ Nomad

    AZ Nomad Guest

    I'd think so.

    A good MOV and a dead MOV are electrically identical (open circuit) until
    you reach the clamping voltage.

    I probably don't replace them often enough, typicaly every 4-5 years or
    about after every other motherboard/cpu upgrade.
  5. ehsjr

    ehsjr Guest

    The indicator is not believable, unless it is telling
    you that the thing is _not_ providing protection.

  6. Gary Tait

    Gary Tait Guest

    No need to, unless the manufactuer specifies otherwise.

    The UPS will have a given ampacity, and plugging more loads than outlets
    could overload the UPS or the cord supplying it.
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