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C655M-A (1/07) 5
Table C. Recommended Wiring Distances
The following are the recommended maximum distances (transformer to load) and are calculated with a 10-percent voltage drop. (Ten percent is
generally the maximum allowable voltage drop for AC-powered devices.) Distances are calculated in feet; values in parentheses are meters.
You can use Table D as a guide to determine the necessary wire gauge (AWG) for various cable distances that provide 24 VAC power. Or use it in
a reverse fashion to determine the maximum allowable cable distance for a particular wire gauge. Table D applies when using 2-conductor
copper wire, with characteristics similar to West Penn 221-227 unshielded cable. Calculations are based on a 10-percent voltage drop (generally
the maximum allowable drop for AC-powered devices).
The minimum acceptable voltage is calculated as follows: 24.0 VAC
–02.4 (10%)
21.6 (Minimum Acceptable Voltage)
The minimum acceptable voltage used to create Table D was 21.6 volts. Therefore, the 24-volt output has an acceptable range from 24 volts
down to 21.6 volts.
Input
Voltage
Total VA
Consumed
Wire Gauge
20 18 16
24 VAC
10 283 (86) 451 (137) 716 (218)
20 141 (42) 225 (68) 358 (109)
30 94 (28) 150 (45) 238 (72)
50 56 (17) 90 (27) 143 (43)
Table D. Required Wire Gauge
Require Wire Gauge Table (AWG)
WIRE
DIST
(feet)
CCD
Camera
PT480
Pan/Tilt
Indoor
Spectra
PT570
Pan/Tilt
Esprit
Pan/Tilt
14-inch
Intercept
CX9000
Receivers
Outdoor
Spectra
!
Equipment Loads
10VA 20VA 30VA 40VA 50VA 60VA 70VA 80VA 90VA 100VA 200VA
1000 12-14 12 N/A N/A N/A N/A N/A N/A N/A N/A N/A
900 12-14 12 12 N/A N/A N/A N/A N/A N/A N/A N/A
800 12-14 12 12 N/A N/A N/A N/A N/A N/A N/A N/A
700 12-16 12 12 12 N/A N/A N/A N/A N/A N/A N/A
600 12-16 12 12 12 N/A N/A N/A N/A N/A N/A N/A
500 12-16 12-14 12 12 12 N/A N/A N/A N/A N/A N/A
40012-1812-141212121212N/AN/AN/AN/A
300 12-18 12-16 12-14 12 12 12 12 12 12 N/A N/A
200 12-20 12-18 12-16 12-14 12-14 12 12 12 12 12 N/A
100 12-22 12-20 12-18 12-18 12-16 12-16 12-16 12-14 12-14 12-14 12
!
Recommended Wire Gauge (AWG) using 24 VAC
N/A – Distance and load not recommended for any wire size between 12-22 (AWG)
XX-XX