Kidde VS Series User Manual

Appendix B: Worksheets
196 P/N 3102351-EN • REV 005 • ISS 28DEC18
Worksheet method
Use this worksheet to determine the maximum cable length of a notification appliance circuit
for a given number of appliances.
Use this worksheet only if all the appliances are regulated. That is, they must have a minimum
operating voltage of 16 V. For other appliances, use the “Equation method.”
NAC cable length
NAC1 NAC2 NAC3 NAC4
Total operating current [1]
A
Load factor (
VS1 panel) ×
0.20
0.20 0.20 0.20
V/A
Load factor (
VS4 panel) 0.24 0.24 0.24 0.24
Load voltage drop
= V
Source voltage
20.4
20.4 20.4 20.4
V
Load voltage drop
− V
Minimum voltage
= V
Regulated appliance voltage
− 16.0 16.0 16.0 16.0 V
Voltage drop [2]
= V
Total operating current
÷ A
Maximum resistance
= Ω
Wire resistance (Ω/ft) [3]
÷
Maximum wire length
= ft.
÷ 2 2 2 2
Maximum cable length
= ft.
[1]
Total of the maximum operating currents for all appliances as specified for FWR power. See the appliance
installation sheets for operating currents.
[2]
This voltage drop is valid for regulated notification appliances only. For unregulated appliances, see “
Equation
method
” on page 197.
[3]
Use the manufacturer’s published wire resistance expressed in ohms per foot. For typical values, see
Table 46 on page 197.

Kidde VS Series Specifications

General

Power Source	120V AC
Battery Backup	9V battery
Sensor Type	Photoelectric
Alarm Sound Level	85 dB at 10 feet
Hush Feature	Yes
Test Button	Yes
LED Indicator	Yes
Mounting Type	Wall or ceiling
Compliance	UL 217