Case Vac

I get 60 volts AC from a computer case to ground! Ouch! Nasty shock!?

Started out thinking it was bad static, but then started metering it. It's 58VAC to 63VAC from computer cases to heat register (an assumed good ground). It's also the same 60VAC from the ground prong in the wall outlet to the heat register. This is scary as upon inspection of the electric box in the basement it's the old fabric covered wire on two circuits, the one in question and one more upstairs. Checking the register in the basement to water pipe ground shows no VAC. One last point, in my electric service, there is a bus with all the white wires and all the ground wires (about half the home is grounded three prong outlets). Shouldn't there be a bus for all the grounds and a bus for the white wires (common)? Thanks!

Most AC power systems in the US are referenced to earth ground.
Electrically neutral and ground are the same so it makes no difference if they're on the same or different buses at the service entrance panel.
It is in good practice to terminate a circuit's neutral and ground separately (under different screws) to avoid a single point of failure.

Start by checking the computer circuit's termination polarity (hot - hot, etc), terminations and splices but chances are the wire insulation has failed necessitating abandonment or replacement.
If it's being replaced, it prolly wouldn't hurt to replace the other circuit of similar wire you mentioned...

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