Edwards Signaling 2400 Series - Manual (Page 53)

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Battery Calculation Example #4
A panel with a Two Zone Initiating Device Circuit Module is to be installed in accordance with the
Canadian National Building Code (NBC) requirement of 24 hours standby, 30 minutes alarm. The
Indicating Appliance Circuit requires 2.5 Amps, and there is no auxiliary power used. Calculate the
minimum required battery capacity that will meet these requirements.
Description Quantity Supervisory
(mA)
Total Supervisory
(mA)
Alarm Total
Alarm
Base Panel 1 x 55 55 100 100
2 Zone input module 1 x 16 16 45 45
Relay Modules x 16 76
Style D IDC Converter 0 0 40
Dialer x 12 25
Annunciator Master x 10 100
Remote Trouble Unit x 10 10
Auxiliary Power (mA)
Number of Detectors
20 0.050 1.0 1.0
Signal Load (mA) 2,500
TOTAL 72 (A) 2,646 (B)
Battery Calculation
Supervisory Hours
24 (C)
Alarm Minutes 30 (D)
Enter the data in the formula and solve the equation.
attery Capacity (A.H.) =
( . )+ ( . ) 111 0 033
1000
Ч Ч Ч Ч
=
72 24 2,646 30
4.5 A. H.
NOTE: Battery capacity of panel can be extended to 10 AH using the 2400-BATBOX Battery Cabinet.
Two 12 V, 6.5 AH batteries (P/N 12V6A5) will adequately power this system. Note that this is the same
sample problem as Example #1. In this case, the answer provided by using the worksheets is the same as
the answer provided by using the tables.