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Computer power supply question

Discussion in 'Electronic Basics' started by peter, Jul 3, 2004.

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  1. peter

    peter Guest

    Computer power supply question
    I bought another AT power supply to replace one in an old computer (I
    needed to get some data out of it!). Everything matches up on the new
    power supply except for the actual on/ off switch wiring for the front
    of the computer. The old switch has only for wires going into it (the
    switch config\colour codes and so on are clearly marked on the old
    power supply), and these wires obviously lead back into the power
    supply. The new power supply came with a switch with the same four
    wires on it all connected, but on this one there's a small green wire
    with small hole connection, and all five wires go into the power
    supply. I assume its an earth to be connected? If so, then why didn't
    my old supply unit have one? And is the voltage AC or DC going into
    this switch? I don't want to muck around with connecting strange
    earth,wires to cases and make the bloody thing live or something! Can
    anyone shed some light on this for me
  2. the Wiz

    the Wiz Guest

    Green wire with round terminal = earth connection (ground connection in this
    former colony ;-)

    More about me:
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  3. If you have an ohmeter why not measure the resistance (on low ohms scale)
    between the earth pin and the green wire ? odds on it would be very low thus
    making it an earth wire as found on many cases.
    Coming from a PSU any wire with a connecting lug would almost certainly be
    earth, besides what else would be enclosed in the switch cable sleeve ?
    If you are still uncertain ask the place you bought it from.
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