What configuration is required for fire and carbon monoxide alarms?

• A. Battery only
• B. Hard wired power only
• C. Battery and hard wired
• D. Not required

Answer: (C)

Alarms must stay powered even when the electrical grid goes down and should alert occupants throughout the home when one goes off. The way to achieve that is by using a hard-wired connection to the house’s electrical system with a battery backup. The battery keeps the alarm functioning during power outages or if a circuit trips, while the hard-wired supply ensures a reliable primary power source and allows interconnected alarms to chirp together. This dual power setup provides continuous protection and the ability to wake the entire home.