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Originally Posted by jbjb
I'm afraid that's not right. A Faraday cage works because the charge on a hollow conductor distributes itself around the outside of that conductor in such a way as to result in no net electric field within the conductor. No ground connection is required for this.
/JB
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Absolutely right. As Wiki succinctly expresses it:
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A Faraday cage's operation depends on the fact that an external static electrical field will cause the electrical charges within the cage's conducting material to redistribute themselves so as to cancel the field's effects in the cage's interior. This phenomenon is used, for example, to protect electronic equipment from lightning strikes and other electrostatic discharges.
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It has nothing at all to do with grounding.