OMNI-624/OMNI-624EU Installation and Setup Guide
2-6
Wiring Information for Keypads & Other Devices
KEYPADS & OTHER DEVICES
If single or multiple devices are connected on a single 4-wire or 2-wire run ("daisy chained") to the
control terminals, do the following:
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 (0.64mm) 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. or 20m (a length
between 50 and 80 ft or 15m and 24m). 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.
Wiring Run Table For Devices Drawing Power From Terminals 23 (+) & 20 (–)
TOTAL CURRENT DRAWN BY ALL UNITS ON A SINGLE WIRE RUN
WIRE SIZE
50mA or less
100mA
300mA
500mA
#22 (0.64mm)
500 ft. (152m)
250 ft. (76m)
80 ft.
(24m)
50 ft. (15m)
#20 (0.8mm)
750 ft. (229m)
380 ft. (116m)
130 ft. (40m)
80 ft. (24m)
#18
(1mm)
1300 ft. (396m)
650 ft. (198m)
220 ft. (67m)
130 ft. (40m)
#16 (1.3mm)
2000 ft. (610m)
1000 ft. (305m)
330 ft. (100m)
200 ft. (70m)
Examples:
1. What is the maximum distance from the control panel for one keypad drawing 30mA using #20
gauge (0.8mm dia.) wire?
Using the table above, the keypad can be placed no farther than 750 ft. (230m) away from the panel
(50mA or less).
2. What is the maximum distance for 5 smoke detectors drawing 0.25mA (50
µ
A each) using #22 gauge
(0.64mm dia.) wire connected in a single-wire run?
Using the table above, the farthest smoke detector can be placed no more than 500 ft. (150m) away
from the panel.
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