Bosch D1255RB User Manual download pdf (Page 26)

| Approved Applications Compliance Guide | 8.0 NFPA 72 Fire Alarm Applications

26 Bosch Security Systems, Inc. | 3/12 | F01U266055-01

8.0 NFPA 72 Fire Alarm Applications

8.1 Household Burglary and Commercial Burglary

Four hours of standby battery capacity are required.

8.2 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 8: 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 10 on page 27.

Remote Station or Auxiliary Fire

Alarm

60 h + 5 min of alarm operation.

Refer to Table 11 on page 27.

Household Fire Warning

Equipment

24 h + 4 min of alarm operation.

Refer to Table 12 on page 28.

8.3 Standby Battery Calculation

Because of changing regulations, verify the necessary time with your local authority having

jurisdiction (AHJ).

Refer to Table 7 on page 24 for totals B and C used in the formulas below. When connecting two

batteries, use either the D122 Dual Battery Wiring Harness or the D8132 Battery Charger Module.

Table 9: General Ampere-Hour (Ah) Calculation Formula

Total B

Hours Total C

Alarm Operation

Contingency Total Ah

(________ x 24 ) + ( ________ x 0.083) + 10% = _________

1 Refer to Table 7 on page 24.

2 Value = Minutes of alarm operation

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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