Question
Why must all metal enclosures of station equipment be grounded?
Answer Options
- A) It prevents a blown fuse in the event of an internal short circuit
- B) It prevents signal overload
- C) It ensures that the neutral wire is grounded
- D) It ensures that hazardous voltages cannot appear on the chassis
Correct Answer: D
Explanation
Safety is the paramount reason for grounding the metal enclosures (chassis) of all station equipment. The protective earth ground connection provides a low-resistance path for any accidental current to flow directly to the earth.
This connection ensures that hazardous voltages cannot appear on the chassis, even in the event of an internal fault (such as a failure where the AC mains voltage touches the enclosure). If a hazardous voltage appears on the chassis, the ground path ensures the circuit breaker or fuse trips instantly, protecting the operator from lethal electrical shock.
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