Sun workstations came supplied with power cords made by Belden. Which have shielding around the 3 wires (hot, neutral and green ground). And other computer cable companies also make these. The only real benefit I can see with these in an audio stereo system is the reduction of stray hum leaking from the hot wire into the audio signal cables. It would also reduce EMI from switching power supplies if any audio equipment has those. One could just use some aluminium foil to wrap the existing power cord and connect the foil via a thin bare stranded wire to the ground of the equipment. No connection at the plug end, as I would not expect it to take a fault current. But cover the cord first with electrical tape, then the foil and bare wire, then another layer of electrical tape over that. Or would that be too hazardous?
