1 2 5 3 0 / 1 2 5 4 0 O W N E R ' S M A N U A L
P/N 447203 Issue I
VIII-4
Standby Current (A.)
Alarm Current (A.)
4-wire Smoke Detectors
Catalog #
Quantity
X Current (A.)
Standby
X =
+
NA
Alarm
X =
NA
+
Standby
X =
+
NA
Alarm
X =
NA
+
End of Line Relay
Catalog #
Quantity
X Current (A.)
X =
+
+
X =
+
+
Notification Appliances
Catalog #
Quantity
X Current (A.)
X =
NA
+
X =
NA
+
X =
NA
+
X =
NA
+
Other =
+
+
TOTAL
Total Standby Current
(from above)
Hours of Standby Required per
NFPA 72 Standard (4, 24 or 60)
AH for Standby
A.
x ____ Hours
=
Total Alarm Current
(from above)
5 Minutes of Alarm Operation
per NFPA 72 Standard*
AH for Alarm
A.
x 0.33 Hours
=
A.H. for
Standby
A.H. for
Alarm
Calculated
A.H.
De-rating
Factor
A.H. Required
Battery Capacity
+
=
X 1.25
=
Notes:
1.
An additional multiplier is included to compensate for the higher discharge rate in alarm. Battery capacity decreases with age.
2.
The Standby c Alarm current must never exceed 4.66 Amps
3.
The following states the maximum standby current allowed using a 38 AH battery set:
60 hours of standby time is 0.5 Amps
24 hours of standby time is 1.2 Amps
4.
Does not include lamp or LED current, add separately.