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Wiring Information For Keypads & Other Devices
If single or multiple devices are connected to a single 4-wire or 2-wire run ("daisy chained")
to the control terminals, determine the current drawn by the unit(s) connected to the single
wire run, then refer to the Wiring Run Table below to determine the maximum wire length
that can be safely used for each wire size.
In some cases, the total current drawn may result in a value not shown in the table. For
example, if you plan to use #22 gauge wire and the total current drawn is 400mA (a value
between 300mA and 500mA), the maximum wire length you should use is approximately 65
ft. (a length between 50 and 80 ft.). Other maximum wire lengths for values of current not
shown in the table can be calculated in a similar manner.
Maximum wire lengths for a device that is "home run" to the control can also be determined
from the table, based on the current draw of that device alone.
WIRE SIZE
Examples:
1. What is the maximum distance from the control panel for one keypad drawing 30mA
using #20 gauge wire?
Using the table, the keypad can be placed no greater than 750 ft. away from the panel (50mA or less).
2. What is the maximum distance for 3 keypads drawing 150mA using #20 gauge wire
connected in a single wire run?
Using the tables above, the farthest keypad can be placed no more than 317.5 ft. away from the
panel. (380-130=250; 250÷2=125; 130+125=255 ft for 200mA; then 380-255=125: 125÷2=62.5;
62.5+255=317.5 ft.
3. What is the maximum distance for 5 smoke detectors drawing 0.25mA (50 microA each)
using #22 gauge wire connected in a single wire run?
Using the table, the farthest smoke detector can be placed no more than 500 ft. away from the panel.
Keypad Addressing
The keypad address identifies the keypad number to the control panel as programmed in
Questions 49-52. LED style and LCD style keypads can share the same addresses (e.g. you
can have LED keypad address 1 and LCD keypad address 1).
Set the keypad addresses by using the keypad's DIP switches and referring to the
following table:
Address
8
7
6
5
4
3
2
1
NOTE: Access the DIP switches by removing the keypad's cover.
2-6
Wiring Run Table for Devices Drawing Power From Terminals 23 (+) & 20 (-)
TOTAL CURRENT DRAWN BY ALL UNITS ON A SINGLE WIRE RUN
50mA or less
#22
500 ft. (152 m.)
#20
750 ft. (228.6 m.)
#18
1300 ft. (396 m.)
#16
2000 ft. (609.6 m.)
Switch
1
2
3
off
off
off
ON
off
off
off
ON
off
ON
ON
off
off
off
ON
ON
off
ON
off
ON
ON
ON
ON
ON
100mA
250 ft. (76 m.)
80 ft. (24 m.)
380 ft. (116 m.)
130 ft. (39.6 m.)
650 ft. (198 m.)
220 ft. (67 m.)
1000 ft. (305 m.)
330 ft. (100.5 m.)
300mA
500mA
50 ft. (15 m.)
80 ft. (24 m.)
130 ft. (39.6 m.)
200 ft. (70 m.)
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