Originally Posted by
jonwhitear
The way I understand it is: electromagnetic waves (EMI) hit your signal wire, and induce a current. That's noise. If you shield the signal wire, the EMI hits the shield and induces a current in that. If the shield is grounded, that current will flow to ground. If not, you effectively get eddy currents in the shield, which themselves can induce a current in the signal wire via capacitance.
With the pots, you do want to ground the case. If your pick guard is shielded (i.e. copper tape on the underneath), the shield will ground the pot where it contacts it. In cases where there isn't a shield to ground the pot, you'll normally see a ground wire soldered to the bottom of the pot.
Cheers,
Jon
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