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NOTE: This is an unformatted excerpt from our online fire protection training library.

Power Supplies

Secondary Supplies

Secondary Power

Secondary power requirements state that within 10 seconds after the primary power fails, the secondary power supply must power the system. Signals must not be lost in the transition from primary to secondary power.

The backup power supply must keep the system in service for a specified period of time. That period varies with system classification. For example, protected premises This type of fire alarm system, formerly known as a local system, provides fire alarm service solely to the protected premises. The fire alarm service control unit, or a remote annunciator, may be located at a constantly attended location, such as a guard post, main telephone switchboard, or receptionist desk, but this is not a requirement of such systems., central station service A central station service alarm company is an Underwriter's Laboratories, Inc. listed or a FM Global listed entity whose primary business is handling signals from protected premises for fire, burglary, and other emergencies. or proprietary systems Proprietary systems provide similar services to central station systems; however, the proprietary system is owned by the same individual or corporation that owns the buildings being protected. Typically the proprietary supervising station is located at one of the buildings being protected and may receive signals from one or more other buildings owned by the same owner. require 24 hours of power in the standby mode. After this period, the backup power supply has to provide power for at least five minutes of full alarm activity. If the alarm system is a remote station Remote station systems are those systems usually connected to a community dispatch center, or other public emergency response entity. However, if these organizations are unwilling to receive fire alarm system signals, the Authority Having Jurisdiction (AHJ) has the right to approve an alternate location that will receive the signals. or auxiliary station system Auxiliary systems connect building fire alarm systems to the public fire service communications center using facilities owned by the municipality. Some of the street fire alarm boxes installed throughout the community are equipped as "master boxes" that can interface with a buildings fire alarm system and transmit a fire alarm signal from that system to the public fire service communications center., the secondary power requirement is also 24 hoursThis is another area where recently there have been changes in NFPA 72. Up until the 2002 edition of NFPA 72, the requirement for remote and auxiliary station secondary power was 60 hours. This was changed, as there are very few locations that are not visited or occupied every day.. The required minimum five minutes of full alarm activity stays the same.

Emergency voice/alarm communications (EVAC) systems also have specific secondary power requirements. The secondary power has to provide 24 hours in quiescence, followed by 15 minutes of full alarm capability.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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