Power Supply Wires

A friend of mine asked me why there are 4 wires (Black, white, brown and blue) coming out of the power supply (connecting to the power switch) instead of just two wires. I have no idea. Any ideas?

Thanks

Pat
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More about power supply wires
  1. This is a standard dual polarity switch found on most old AT computers. This is done to enable both Positve and Neutral to be disconected with one switch.

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  2. Thanks, that's what I was looking for!
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