An alarm switch shall be permitted only if which of the following conditions are met?

An alarm switch shall be permitted only if which of the following conditions are met?

• A. All Of The Above
• B. It Is Key-Operated Or Located Within A Locked Cabinet
• C. It Will Give A Trouble Signal If Left In The "Silence" Position When No Alarm Exists
• D. It Transfers Indication Of An Alarm To A Visual Indicator

Answer: (A)

This question highlights how an alarm-switch control should behave to prevent tampering, ensure clear status, and provide proper feedback. First, tamper resistance: requiring the switch to be key-operated or located in a locked cabinet means only authorized people can operate or silence alarms. This reduces the chance of accidental or malicious disabling and helps maintain a reliable alert system. Second, fault feedback when silenced without an active alarm: if the switch is left in a Silence position when there is no actual alarm, a trouble signal should make that condition visible. This prevents unnoticed misconfigurations or neglected faults and ensures that operators know the switch isn’t in a normal state. Third, clear status indication: transferring the indication of an alarm to a visual indicator ensures that the alarm state is visible somewhere other than only at the main panel or in the control room. Visual indication helps occupants and maintenance staff quickly understand that an alarm has occurred and that it has been acknowledged or silenced. Because all of these safeguards work together to maintain security, visibility, and reliability of the alarm system, the best choice is that every listed condition must be met.

This question highlights how an alarm-switch control should behave to prevent tampering, ensure clear status, and provide proper feedback.

First, tamper resistance: requiring the switch to be key-operated or located in a locked cabinet means only authorized people can operate or silence alarms. This reduces the chance of accidental or malicious disabling and helps maintain a reliable alert system.

Second, fault feedback when silenced without an active alarm: if the switch is left in a Silence position when there is no actual alarm, a trouble signal should make that condition visible. This prevents unnoticed misconfigurations or neglected faults and ensures that operators know the switch isn’t in a normal state.

Third, clear status indication: transferring the indication of an alarm to a visual indicator ensures that the alarm state is visible somewhere other than only at the main panel or in the control room. Visual indication helps occupants and maintenance staff quickly understand that an alarm has occurred and that it has been acknowledged or silenced.

Because all of these safeguards work together to maintain security, visibility, and reliability of the alarm system, the best choice is that every listed condition must be met.