Bosch D4412 - Current Rating Chart for Standby Battery Calculations; Standby Battery Requirements; Standby Battery Calculation for NFPA 72 Fire Alarm Applications

D6412/D4412 Operation and Installation Guide
Page 68 © 2003 Bosch Security Systems45349E
D6412/D4412
Appendix A: Approved Applications Compliance Guide
A-4 Current Rating Chart for Standby Battery Calculations
A
AC Power On
Normal Current
B
AC Power Off
Minimum Current
C
In Alarm
Maximum Current
Model Number
Quantity
Used
Each
Unit* Total
Each
Unit Total
Each
Unit
Total
D6412/D4412 85 x 1 = 85 85 x 1 = 85 100 x 1 = 100
Keypads
D621 35 x Qty = 35 x Qty = 115 x Qty =
D623 100 x Qty = 100 x Qty = 100 x Qty =
D625 270 x Qty = 270 x Qty = 270 x Qty =
Accessories
DX2010 35 x Qty = 35 x Qty = 35 x Qty =
DX3010 10 x Qty = 10 x Qty = 10 x Qty =
DX3020 10 x Qty = 10 x Qty = 10 x Qty =
DX4010 25 x Qty = 25 x Qty = 25 x Qty =
RF3224 30 x Qty = 30 x Qty = 30 x Qty =
Sounders connected to PO2
D118 8
Ω
=
Speaker*** 0 x Qty = 0 x Qty = 330 x Qty =
Ratings of other devices in the system which are not shown here.
x Qty = x Qty = x Qty =
x Qty = x Qty = x Qty =
x Qty = x Qty = x Qty =
x Qty = x Qty = x Qty =
x Qty = x Qty = x Qty =
Total A
=
Total B
=
Total C
=
* Currents shown in milliamperes (1 ampere = 1000 milliampere).
**
If the column C total exceeds 400 mA (600 mA for non UL applications), a D8132 is required to provide an
additional 1400 mA. You may also use a UL Listed external power supply for this purpose.
*** Not investigated by UL.
A-5 Standby Battery Requirements
Household Burglary and Commercial Burglary
4 hrs. of standby battery capacity required.
Central Station or Local Fire Alarm
24 hrs. of standby plus 4 min. of alarm operation required. See Central Station or Local Systems Ampere-Hour Calculation
Formula in the Standby Battery Calculation for NFPA 72 Fire Alarm Applications section.
Household Fire Warning Equipment
24 hrs. of standby plus 4 min. of alarm operation required. See Household Fire Ampere-Hour Calculation
A-6 Standby Battery Calculation for NFPA 72 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 hrs.) 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.