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8.0 N FPA 72 Fire Alarm Applications 8.1 Standby Battery Calculation for NFPA 72 Rre nn Applications Refer to. Tahle 3 on page 19 for totals B and C used in the formulas b ow. When connecting two batteries, use either the D 122 Dual Battery Wning Hamess or the D8132 Ba.tteJ:y Module.. 8.2 Central Station or local Systems Central Station or Local Systems require 24 h of standby plus.5 min f alarm operation at the end of the 24-hour period. A single battery is sometimes adequate for central station but two batteries must be installed to meet the basic standby requirements for a local system installation. e thebattery ampere-hour (Ah) calculations to confum compliance. The formula in TalJIe 6 includes the calculatio for 5 min of alarm operation at the end of the 24-hour period, as well as a 10% contingency factor that allows fo depletion of battery capacity with age. Central Stations or Local Systems Ah Calculation Fa .,. otaI Ah requirements must not exCeed Ah c:apaciIJ of batteries: two 0126 BatIBries= 14Ah; one 01218 Battery = 17.2 or 18 Ah. 8.3 Remote Station or Auxiliary Systems Remote Station or Auxiliary Systems require 60 h of standby plus 5 of alarm ~peration at the end of the 60-hourperiod. A D8132 Battery Charger Module with additional .es installed in a separate D8109 or D8108A Enclosure might be required in the system to meet the basic dby requirements for a remote station or auxiliary system installation. Use battery AhcaICUlaticins toconfum c mpJiance. The formula in TalJle 7includes the calculation for 5 min of alarm operation atthe end of the 6O-hour period., as well as a 10% contingency factor that allows for depletion of battery capacity with age. Remote Slation or Auxiliary Systems Ah C?tlculation .,. otaI Ah requirements must not exceed Ah capacily of batteries: two 0126 BatIBries = 14 Ah; one 01218 Battery = 17.2 or 18 Ah. Bosch Security Systems I 5/051 F01 U003639B 21