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Primary power most often comes from a dependable connection to the public power grid. The power supply is fundamental to all fire alarm system. Basic rules apply to power supplies. The rules protect the power to the fire alarm system from being disconnected and subsequently failing. Like other electrical installations, the power supply must conform to the National Electrical Code (NFPA 70). You may also have local jurisdictional rules.
A fire alarm system needs two independent power supplies, a primary and a secondary.
Primary power normally connects to the building's light and power service. The secondary (or backup) power supply may be as simple as control unit battery power or as complex as a combination of batteries and an engine driven generator.
Both the primary and secondary power supplies must be capable of carrying the electrical system requirements of the entire fire alarm system.
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