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For static discharge, the usually mode of protection is to connect together and ground all the electronic equiptment, so that there's no opportunity or place for static voltages to build up. Anyways, to summarize: Use shielding to protect against wave generated magnetic fields and use grounding to protect from static discharge magnetic fields.

Offered by Ed

Grounding is used when you want to keep the unit in operation. If you store it in a magnetic conductive and electrical conductive box then you have shielding for both electrical and magnetic damage to its contents.

Offered by Mike.