How many power supplies must a residential fire alarm system have?

A residential fire alarm system must have two power supplies to ensure reliable operation and compliance with safety standards. The first power supply typically comes from the main electrical system of the home, while the second is a backup, usually in the form of a battery. This redundancy is critical in fire alarm systems, as it guarantees that the system remains operational in the event of a power failure or outage, which is particularly important in emergency situations where immediate alerts can save lives and property. Having dual power supplies helps to meet regulations set by various codes, which dictate that fire alarm systems must be capable of functioning under diverse conditions, thus enhancing the overall reliability and effectiveness of fire safety measures in residential settings.