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Ground one side of isolation xmfr?

Discussion in 'Electronic Basics' started by Eric R Snow, Dec 16, 2003.

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  1. Eric R Snow

    Eric R Snow Guest

    I'm using a stepdown xmfr to get 110 from 220. Should one leg of the
    uotput be grounded? The 110 will be used to power a computer and some
  2. Not necessary. Just ground the computer (or whatsoever) properly, that's
    all. Don't forget to ground the metal case of the transformer however (if
    applicable). Note that you may want to use a basic capacitive hi-freq filter
    to assess RFI problems (if any come up). In this case, 3 small HV caps
    (something like 0.047uF 2000VAC) are connected between the ground and the 2
    output leads like a triangle.

  3. I would ground one side to create a neutral (grounded current carrying
    conductor). Without this, there is an indeterminate (and possibly
    damaging) amount of voltage in common on both legs of the output,
    caused by leakage and static sources. You wouldn't want leakage from
    the CRT high voltage supply finding its way back into the common power
    supply lines and arcing over the computer power transformer.
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