Appendix B: Worksheets
Vigilant VS1 and VS2 Technical Reference Manual 201
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 (VS2 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 202.
[3] Use the manufacturer’s published wire resistance expressed in ohms per foot. For typical
values, see Table 43 on page 202.
To Next Page
Loading...
