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

Power Supplies

Sample battery calculation worksheet

The table represents the electrical power the system needs when it operates in standby mode. The batteries supply this energy. Notice that the horns and horn/strobes have no value when the system is in standby. They aren't turned on until the system goes into alarm mode.

System Component Standby Current (Amps) Quantity Total for Components (Amps) Control Panel 0.18 1 0.18 Duct Smoke Detectors 0.007 6 0.042 Area Smoke Detectors 0.0006 30 0.018 Waterflow Switches 0 2 0 Horns 0 11 0
Horn/strobes 0 13 0
Total Standby Current     0.24 Amps

Keep in mind also that the total value has to be provided for 24 hours.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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