D9412GV4/D7412GV4 v2.03 | Installation and System Reference Guide | 22.0 NFPA 72 Fire Alarm
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Bosch Security Systems, Inc. | 7/16 | F01U265457-09 155
22.0 NFPA 72 Fire Alarm Applications
22.1 Household Burglary and Commercial Burglary
Four hours of standby battery capacity are required.
22.2 Bank Safe and Vault
Because of changing regulations, verify the necessary time with your local authority having
jurisdiction (AHJ).
UL 365 requires 72 h of standby battery capacity. Limit the auxiliary power current for all devices,
including keypads, to 300 mA or less to meet this requirement.
Table 43: Standby Battery Requirements
Type Required Capacity Calculations
Household Burglary and
Commercial Burglary
4 h
Bank Safe and Vault
72 h (UL 365). Auxiliary power
current for all devices, including
keypads, must be limited to 300 mA
or less to meet this requirement.
Central Station or Local Fire Alarm
24 h + 5 min of alarm operation.
Refer to Table 45 on page 156.
Remote Station or Auxiliary Fire
Alarm
60 h + 5 min of alarm operation.
Refer to Table 46 on page 156.
Household Fire Warning
Equipment
24 h + 4 min of alarm operation.
Refer to Table 47 on page 157.
22.3 Standby Battery Calculation
Because of changing regulations, verify the necessary time with your local authority having
jurisdiction (AHJ).
Refer to Table 41 on page 152 for totals B and C used in the formulas below. When connecting two
batteries, use either the D122 Dual Battery Wiring Harness or the B520 Auxiliary Power Supply
Module.
Table 44: General Ampere-Hour (Ah) Calculation Formula
Total B
1
Hours Total C
1
Alarm Operation
2
Contingency Total Ah
3
(________ x 24 ) + ( ________ x 0.083) + 10% = _________
1 Refer to Table 41 on page 152.
2 Value = Minutes of alarm operation
60
3 Total Ah requirements must not exceed the Ah capacity of batteries:
One D126 Battery = 7 Ah
Two D126 Batteries = 14 Ah
One D1218 Battery = 17.2 or 18 Ah
Two D1218 Batteries = 34.4 or 36 Ah
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