Kidde VS Series User Manual

Appendix B: Worksheets
P/N 3102351-EN • REV 005 • ISS 28DEC18 199
= 20.4 V − 0.40 V
= 20.0 V
Vd = Vm − Va
= 20.0 V − 16.0 V
= 4.0 V
Rmax = Vd / Itot
= 4.0 V / 2.0 A
= 2.0 Ω
Lc = (Rmax / Rw) / 2
= (2.0 Ω / 0.002 Ω/ft.) / 2
= (1,000.0 ft.) / 2
= 500.0 ft.
So the maximum wire run for this NAC would be 500 ft. (rounding down for safety).
NAC maximum wire run quick reference tables
Table 47: VS1 panel
Current
12 AWG
14 AWG
16 AWG
18 AWG
0.5 A
2,228 ft.
1,400 ft.
879 ft.
553 ft.
1.0 A
1,088 ft.
684 ft.
429 ft.
270 ft.
1.5 A
708 ft.
445 ft.
279 ft.
175 ft.
2.0 A
518 ft.
326 ft.
204 ft.
128 ft.
2.5 A
404 ft.
254 ft.
160 ft.
100 ft.
Table 48: VS4 panel
Current
12 AWG
14 AWG
16 AWG
18 AWG
0.5 A
2217 ft.
1394 ft.
875 ft.
550 ft.
1.0 A
1,077 ft.
677 ft.
425 ft.
267 ft.
1.5 A
697 ft.
438 ft.
275 ft.
173 ft.
2.0 A
507 ft.
319 ft.
200 ft.
126 ft.
2.5 A
393 ft.
247 ft.
155 ft.
97 ft.

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