D2112/D2112E Installation Manual
Page 18
74-07111-000-D 196
© 1995 Radionics
The D8108A is attack resistant. It is intended
primarily for UL commercial burglar alarm and
mercantile safe and vault applications requiring a
local bell. You can use the D8108A in any burglar
application where the D8103 or D8109 enclosure is
suitable. The D8108A is approved by Factory
Mutual, California State Fire Marshal, and the New
York City Materials and Equipment Acceptance
System.
The D8109 is normally used for fire alarm
applications. The D8109 is approved by Factory
Mutual, California State Fire Marshal, and the New
York City Materials and Equipment Acceptance
System.
Standby Battery Requirements
Household Burglary and Commercial Burglary
Four hours of standby battery capacity required.
Standby Battery Calculation for
Fire Alarm Applications
NFPA 72 Household Fire Warning Equipment
The NFPA 72 Household Fire Warning Equipment
Standard requires 24 hours of standby plus four
minutes (.067 hrs) of alarm operation at the end of
the 24 hour period.
You must use battery ampere hour (Ah) calculations
to verify compliance. The formula below includes a
10% contingency factor for depletion of battery
capacity with age.
NFPA 72 Ampere-Hour Calculation Formula
(Total B ___ x 24 Hrs) + (Total C ___ x .067 Hrs) +
(10% Contingency) = Total Ah required.
Total Ah requirements must not exceed Ah capacity
of batteries.
Current Rating Chart for Standby Battery Calculations
All currents are in milliamperes (1 ampere=1000 milliamperes).
AC Power On
AC Power Off
In Alarm
Normal Current
Minimum Current
Maximum Current
Model
Number
Each
Each
Each
Number
Used
Unit
Total
Unit
Total
Unit
Total
D202
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45
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45
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125
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Total A
1
= _____
Total B = _____
Total C
2
= _____
1 If Total A exceeds 860 mA, a stand-alone power supply is required to provide additional current.
2 If Total C exceeds 860 mA for fire systems, a stand-alone power supply is required to provide additional
current.