Why might the metal alarm panel box be grounded according to recommended practices?

• A. To ensure the cabinet is grounded in case a power wire comes loose and contacts the cabinet.
• B. To reduce radio interference.
• C. To improve aesthetics.
• D. To increase the signal range of the alarm.

Answer: (A)

Grounding the metal alarm panel box provides a safe fault path to earth. If a power conductor were to come loose and contact the metal cabinet, the fault current would flow to ground rather than energizing the cabinet, keeping the enclosure at earth potential. This allows the protective device (fuse or breaker) to trip quickly, reducing the risk of electric shock, arcing, or fire. That safety-oriented reason is why grounding is recommended practice. While grounding can have incidental effects on electrical noise, it is not the main purpose here, and it does not affect aesthetics or the alarm’s signal range.