Fire alarm equipment must be designed and tested so that it is capable of performing at what nameplate input voltage?

Fire alarm equipment must be capable of performing at 110% of its nameplate input voltage. This requirement ensures that the equipment can operate effectively under voltage fluctuations that might occur in the electrical supply. By designing and testing the equipment to function optimally at this level, manufacturers ensure reliability and safety in real-world applications, where power supply conditions may vary.

Using 110% as the operational benchmark helps to accommodate for situations where the supply voltage might dip or fluctuate. It is important for fire alarm systems to maintain functionality and alerting capabilities even under less than optimal conditions to ensure maximum safety and compliance with fire safety standards. This is why 110% serves as the effective target, allowing for a margin of safety and reliability in fire alarm systems.