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<br />Appendix A: Power Calculations <br /> <br />Use the Total Standby and Alarm Load Currents calculated in Tables A-1 and A-2 for the following battery <br />calculation. <br /> <br />Standby Load Current <br />(Amps) <br />[.'" 'S'] <br /> <br />x <br /> <br />Required Standby lime in Hours (24 or 60 <br />Hours) <br />[:!. ll] <br /> <br />= <br /> <br />}. S' <br /> <br />, <br /> <br />Alarm Load Current (Amps) <br />[.3 ... 31 <br /> <br />x <br /> <br />Required Alarm Time in Hours (Le. 5 min. = <br />0.084 hours) <br />[ ] <br /> <br />= <br /> <br />6~~ <br />, <br /> <br />Add Standby and Alarm Load for Required Ampere Hour Battery <br /> <br />= <br /> <br />), g~9 <br />J. ,J 9- <br />7AH <br /> <br />Multiply by the Derating Factor of 1.2 <br /> <br />= <br /> <br />Total Ampere Hours (AH) Required <br /> <br />= <br /> <br />Select a battery with a greater amp/hour rating. <br />Notes: * NFPA 72-1993 Central Station, Local and Proprietary Protected Premises systems require 24 hours of standby. <br />* NFPA 72.1993 Auxiliary and Remote Station systems require 60 hours of standby. <br /> <br />15465 Rev F 512197 PIN 15465: F <br /> <br />59 <br />