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All,

I

If the radio has bypass caps on the line to chassis, and many do, you can
develop sixty or so volts AC from chassis to ground because the two
caps form a voltage divider. Measure the DC resistance between each
of the power lugs to the chassis, you should see infinite resistance.
Don't relay on the coax shell to provide a safety ground, you're only going
to end up getting knocked on your butt repeatedly when working on the
rig. The best bet is a three wire cord with safety ground.

Pete