In a household fire alarm system, which statement about smoke detection circuit locking is correct?

In a household fire alarm system, which statement about smoke detection circuit locking is correct?

• A. They must lock in
• B. Shall not be required to lock in
• C. Must be monitored by a separate panel
• D. Must be hardwired

Answer: (B)

In a household fire alarm system, there’s no requirement for the smoke-detection circuit to lock in. Residential systems are designed for clear, local alarm signaling and easy reset after the triggering condition is resolved. Locking the detection circuit would keep the alarm state latched regardless of whether the condition persists, making testing and resetting more cumbersome and prone to nuisance alarms. The system is typically monitored by the main panel (not a separate panel), and installations can be hardwired or wireless—hardwiring is not mandatory for all setups. So the correct idea is that locking in is not required.

In a household fire alarm system, there’s no requirement for the smoke-detection circuit to lock in. Residential systems are designed for clear, local alarm signaling and easy reset after the triggering condition is resolved. Locking the detection circuit would keep the alarm state latched regardless of whether the condition persists, making testing and resetting more cumbersome and prone to nuisance alarms. The system is typically monitored by the main panel (not a separate panel), and installations can be hardwired or wireless—hardwiring is not mandatory for all setups. So the correct idea is that locking in is not required.