The fire alarm circuit disconnect should have what feature?

The key feature of a fire alarm circuit disconnect being designed to secure in the "on" position is crucial for ensuring the system's reliability and effectiveness in emergency situations. This feature ensures that once activated, the circuit remains operational, allowing the fire alarm system to perform its vital function of alerting occupants and emergency services.

If the disconnect could be easily switched to "off" accidentally or without intent, it could lead to dangerous situations where the alarm does not activate during a fire, thereby compromising safety. By securing the circuit in the "on" position, it creates a fail-safe environment where the system remains engaged and can function as intended even in unexpected situations.

The other aspects, while relevant to fire alarm systems, do not serve the primary purpose of ensuring continuous operation during emergencies. For example, while the inclusion of a manual override and connection to a backup power supply enhance functionality or reliability in specific scenarios, they do not prioritize the need for the circuit to remain securely activated when needed most.