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 | F01U265457-09 157
22.6 Household Fire Warning Equipment
The Household Fire Warning Equipment Standard requires 24 h of standby current plus 4 min of alarm
operation at the end of the 24-hour period. Use battery Ah calculations to confirm compliance. The
formula in Table 47 includes the calculation for 4 min of alarm operation at the end of the 24-hour
period, and a 10% contingency factor that allows for depletion of battery capacity with age.
Because of changing regulations, verify the necessary time with your local AHJ (authority
having jurisdiction).
Table 47: Household Fire Ah Calculation Formula
Total B
1
Hours Total C
1
Alarm Operation
2
Contingency Total Ah
3
(_______ x 24) + ( ________ x 0.067) + 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
22.7 UL 609
The leads providing operating power to the alarm sounding device shall be electrically and
mechanically protected as required in the Standard for Installation and Classification of Mercantile
and Bank Burglar-Alarm Systems, UL 681, or the circuit shall be constructed so that the system is not
defeated by cutting or short-circuiting connections between the control unit and the alarm housing.
The alarm housing for a bank alarm system without a remote alarm transmission connection shall be
mounted on the outside of the building, visible from a public street or highway. It shall be accessible
for examination and repair. It shall also be located not more than four stories above the street level
unless:
a. A second alarm sounding device and housing, intended for outside service [see 3.3(a)], is
mounted adjacent to the premises or area of the building in which the alarm system is installed or
b. A second alarm sounding device, intended for inside service [see 3.3(b)], is mounted within the
premises.
In either case, the outside alarm sounding device and housing may be mounted as high as the seventh
floor.
22.8 UL 365
In a mercantile burglar alarm system, a mercantile alarm sounding device located within a building but
outside the protected area, is acceptable, provided it is rated for outside service and alarm conditions
are transmitted to:
a. The dispatch location of the law enforcement agency having jurisdiction over the protected
property or
b. A central station or residential monitoring station complying with the Standard for Central-Station
Alarm Services, UL 827.
In a mercantile burglar alarm system, an alarm sounding device located within the area of greatest
protection, or outside the area of greatest protection but within an area protected by an alarm system
and that shares a common control unit with the system installed in the area of greatest protection, is
acceptable provided it is rated for inside service and alarm conditions are transmitted to:
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