Bosch D2212B - Standby Battery Requirements; Standby Battery Calculation for Fire Alarm Applications

D2212B/D2212BE Operation and Installation Guide
D2212B/D2212BE
Page 35© 2002 Bosch Security Systems 39934E
Standby Battery Requirements
Household Burglary and Commercial Burglary
Standby battery capacity of 4 hrs. is required.
Standby Battery Calculation for Fire Alarm Applications
NFPA 72 (Chapter 2) Household Fire Warning Equipment: The NFPA (Chapter 2) Household Fire Warning Equipment
Standard requires 24 hrs. of standby plus 4 min. (0.067 hr.) of alarm operation at the end of the 24 hr. period. You must use
battery ampere hour (Ah) calculations to verify compliance. The formula in the next column includes a 10% contingency
factor for depletion of battery capacity with age.
NFPA 72 (Chapter 2) Ampere-Hour Calculation Formula:
(Total B ___ x 24 hrs.) + (Total C ___ x 0.067 hrs.) + (10% Contingency) = Total Ah required.
Total Ah requirements must not exceed Ah capacity of batteries.
For Battery Calculations: When system is idle, running on battery only, the current draw from the battery is 125 mA. When
the system is in communication, running on battery only, and set for pulse dialing, the current draw from the battery is
190 mA.
All currents are in milliamperes (1 ampere = 1000 milliamperes)
AC Power ON
Normal Current
AC Power OFF
Minimum Current
In Alarm
Maximum Current
Model
Number
Number
Used
Each
Unit
Total
Each
Unit
Total
Each
Unit
Total
D2212B 1 125 125 125 125 190 315
D202A _____ 45 _____ 45 _____ 125 _____
D220A _____ 30 _____ 30 _____ 125 _____
D222 _____ 30 _____ 30 _____ 140 _____
D223 _____ 30 _____ 30 _____ 140 _____
D208RF _____ 50 _____ 50 _____ 50 _____
D216RF _____ 50 _____ 50 _____ 50 _____
_______ _____ ___ _____ ___ _____ ___ _____
_______ _____ ___ _____ ___ _____ ___ _____
_______ _____ ___ _____ ___ _____ ___ _____
_______ _____ ___ _____ ___ _____ ___ _____
_____
Total A*
=
_____
Total B
=
_____
Total C**
=
_____
* If Total A exceeds 1.0A (140 mA for fire and combined fire/burglary systems, a stand-alone power supply is
required to provide additional current.
** If Total C exceeds 860 mA, for fire systems, a stand-alone power supply is required to provide additional
current.
Table 6: Current Rating Chart for Standby Battery Calculations
Appendix C