Why do some UL-listed household electronic devices have grounded plugs, even if they have no exposed metal on their case?
E.g., I have a plastic-encased laptop AC/DC power supply that requires a grounded plug, but my TV (which also must convert household AC to DC) does not have a grounded plug.
I thought the only purpose of a grounded plug was to catch a short that might energize some conductive part with which a user might come in contact. What are the other purposes? Or when are they indicated or required by regulators?
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