Battery and Power Supply Calculations
P/N 06-237058-001 A-3 February 2012
Note: ARIES NETLink systems must comply with Table A-2 in order to satisfy UL and FM
requirements.
Note: The maximum battery capacity that can be charged per UL 864, ULC S527 and FM requirements
is 165-AH, derated by 20-percent (132-AH).
Calculations:
REFERRING TO TABLE A-2, ENTER STANDBY TIME REQUIRED (in hours): ______
REFERRING TO TABLE A-2, ENTER ALARM TIME REQUIRED (in minutes): ______
CONVERT ALARM TIME REQUIRED TO HOURS (using formula below):
(minutes)/60 = ______hours
CALCULATE TOTAL AMPERE HOURS (using formula below):
((TOTAL STANDBY CURRENT) x (STANDBY TIME REQUIRED in hours)) + ((TOTAL ALARM CURRENT
x ALARM TIME REQUIRED in hours)) = ______TOTAL AMPERE HOURS
CALCULATE BATTERY CAPACITY WITH A DE-RATING FACTOR OF 20%
(using formula below):
1.2 x TOTAL AMPERE HOURS = ______BATTERY CAPACITY
REFERRING TO TABLES A-3 AND A-4, DETERMINE NUMBER OF POWER SUPPLIES NEEDED:
NOTE: If TOTAL ALARM CURRENT > 5.4 A, then 2 or more PSUs are required.
Table A-2. Duration Times for Standby and Alarm
Type of System Standby Alarm
Local Fire Alarm Systems per NFPA 72 24 hours 5 minutes
Clean Agent Suppression Systems per NFPA 12, 12A, 12B, and 2001 24 hours 5 minutes
Deluge or Pre-Action Water Spray Systems per Factory Mutual 90 hours 10 minutes
Table A-1. Current and Alarm Load Worksheet (Continued)
Unit Description Qty
Unit Standby
Current
(A)
Unit Alarm
Current
(A)
Total
Standby
Current
Total Alarm
Current
To Next Page
Loading...
Need help?
General
