Edwards Signaling FireShield Single-Zone Panel - Manual (Page 5)

Installation Sheet 04MAR03 P/N: 3100589 REV: 1.0
FireShield Single-Zone Panel - Installation and Operating Instructions 5 / 6
Battery calculation worksheet
Use this worksheet to determine the minimum amperage
capacity required for the panel's standby battery. You can
obtain operating current requirements for notification
appliances from their respective installation sheets.
Standby
Current (mA)
Alarm
Current (mA)
Base panel [1] 50 165
RTU (Aux current) 10 13
IDC detector current [2] [3] [4] [6] 75
NAC load [see NAC voltage drop] 0
Total current
Required standby and alarm time × Enter
standby
time in
hours × Alarm time 5 min = 0.083 hr
10 min = 0.167 hr
15 min = 0.250 hr
30 min = 0.500 hr
mAh + mAh = mAh
÷ 1000
Battery amp hour total = Ah
× 1.2
Minimum battery size [5] = Ah
Notes
[1] Base panel includes main controller board with no load, only EOL resistors (standby current: 50 mA, alarm current: 85 mA)
[2] See the FireShield UL and ULC Compatibility List (P/N 3100592) for the maximum number of detectors per IDC
[3] See the FireShield UL and ULC Compatibility List (P/N 3100592) for detector current ratings
[4] Maximum supervisory IDC current can not exceed 3.0 mA
[5] The maximum battery size the panel can charge is 4.5 Ah
[6] Use maximum value or actual calculated value (Detector quantity x detector current (mA) = Total standby current for IDC). An
active pull station draws 75 mA.
Notification appliance voltage drop calculation
NAC voltage drop calculations
Circuit length Total circuit current [2] Wire resistance per 1000 ft [1] Voltage drop
feet x amps x Ω ÷ 1000 =
Panel voltage Voltage drop End of line voltage [3] Voltage drop Panel voltage Voltage drop %
[4] – = ÷ [4] =
Notes
[1] Use 3.5 Ω for 12 AWG and 2.5 sq mm wire, 5.2 Ω for 14 AWG and 1.5 sq mm wire, 8.0 Ω for 16 AWG and 1.0 sq mm wire,
and 13.0 Ω for 18 AWG and 0.75 sq mm wire
[2] Use the 20 Vfwr Average Operating Current ratings found on the installation or catalog sheet of each device
[3] Cannot drop below 17 Vdc
[4] 18.9 V min. NAC output voltage