Why must all metal enclosures of station equipment be grounded?
It prevents a blown fuse in the event of an internal short circuit
It prevents signal overload
It ensures that the neutral wire is grounded
It ensures that hazardous voltages cannot appear on the chassis✓Bonne réponse
Explication
If an internal conductor at line potential contacts the metal enclosure, the enclosure becomes live and anything touching it is exposed to the full supply voltage. A safety ground gives that fault current a low-impedance return so the enclosure stays near earth potential and the overcurrent device opens; preventing the fuse from blowing would defeat this intended protective action.