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RE: Question...

Jim - this is about noise pickup by an unconnected piece of metal. These capacitors are big, so the shell, if not grounded one way or another, presents a good antenna for picking up stray electromagnetic fields. Same reason why transformer cores in low level audio transformers are electrically grounded.

One way to ground the shell is to strap it directly to ground. This is not good because this may add quite significant shunt capacitance to ground. The better way is to connect the shell to one of the leads, and use that lead as outer foil connector.


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