Quote:
Originally Posted by ErichKeane
The power supply itself is the only one routed directly to the 3rd pin AC Common.
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The 3rd pin on the line cord (which most of us call the ground or earth terminal) connects directly to the metal power supply case, which is connected directly to the computer case by it's mechanical mounting. The negative output wires of the power supply are soldered to the ground path on the power supply circuit board, which is mechanically connected to the power supply case also.