Kidde VS Series User Manual

Appendix B: Worksheets
202 P/N 3102351-EN • REV 005 • ISS 28DEC18
RZI16-2 24V IN riser maximum wire run calculation
Use the APS/BPS notification appliance circuit calculation in the Remote Booster Power
Supply Manual (P/N 3100485-EN) to calculate maximum wire run distance for RZI16-2 NAC
circuits.
RZI16-2 24V IN cable length
VS1 AUX1 VS4 AUX1 APS/BPS
Maximum RZI16
-2 alarm current
0.85
0.85 1
A
Load factor
× 0.20 0.24 0.59
Alarm current voltage drop
=
0.17
0.20 0.59
V
Source minimum voltage
20.40 20.40 19.10 V
Load voltage drop
−
0.17
0.20 0.59
V
Minimum source output voltage
=
20.23
20.20 18.51
V
RZI16
-2 minimum input voltage − 18.40 18.40 18.40 V
Voltage drop [1]
=
1.83
1.80 0.11
V
Total operating current
÷ 0.85 0.85 1 A
Maximum wire resistance
= 2.15 2.21 0.11 Ω
Wire resistance (Ω/ft) [2]
÷
0.00198
0.00198 0.00198
Maximum single wire length
= 1, 087 1, 142 55 ft.
÷
2
2 2
Maximum 2
-wire cable
length[3]
=
543
535 27.5
ft.
[1] This voltage drop is valid for regulated notification appliances only.
[2] For example, the value shown is typical resistance for 12 AWG 7-strand wire. Use the manufacturer’s
published wire resistance expressed in ohms per foot. For other typical values, see Table 46 on page 197.
[3] The value shown is for the VS4 panel. Maximum RZI16-2 24V IN riser cable distance length shown is based
on using 12 AWG, 7-strand conductor cable.

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