12530/12540 OWNER'S MANUAL
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 current + 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.
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