
Installation and Programming Manual
18
in feet in meters 22 20 18 16 14
up to 15 ft up to 5 m
4
15 – 25 ft 5 – 8 m
4
25 – 40 ft 8 – 12 m
4
40 – 60 ft 12 – 20 m
4
60 – 100 ft 20 – 30 m
4
Table 2-2: Wiring Between the ORBIT-Pro Main Board and the 16.5VAC / 40VA Plug-In Transformer
Maximum Combined Length
of All Expansion BUS Wiring
Wire Gauge
(AWG) Size
in feet in meters
22 656 200
20 1092 333
19 1312 400
Table 2-3: 4-Wire Expansion BUS Wiring One-Way Lengths Based on Wire Gauge
NOTE: For maximum system stability, it is best NOT to exceed a total of 1000 feet of wire when wiring the
Expansion BUS.
Desired Wire Gauge in Particular Branch
18 19 20 22 24
Max run in max run in max run in max run in max run in
Total Auxiliary
Power:
Maximum Current
Draw per Branch
Feet meters feet meters feet meters feet meters feet meters
20 mA 3920 1195 3100 945 2460 750 1550 472 970 296
30 mA 2600 793 2060 628 1640 500 1030 314 646 197
40 mA 1960 597 1550 472 1230 375 775 236 485 148
50 mA 1568 478 1240 378 984 300 620 189 388 118
60 mA 1300 396 1030 314 820 250 515 157 323 98
70 mA 1120 341 886 270 703 214 443 135 277 84
80 mA 980 299 775 237 615 187 388 118 243 74
90 mA 867 264 687 209 547 166 343 105 215 66
100 mA 784 239 620 189 492 123 310 94 194 59
Table 2-4: Auxiliary Power Branch Wiring Lengths Based on Gauge Sizes and Detector Current
NOTE: The wire lengths indicated represent the one-way distance between the source of power and the last
detector in the branch.
Desired Wire Gauge in Particular Branch
18 19 20 22
max run in max run in max run in max run in
Maximum External
Sounder Current:
Maximum Current
Draw per Branch
feet meters feet meters feet meters feet meters
100 mA 780 238 625 191 495 151 310 94
200 mA 390 119 313 95 248 76 155 47
300 mA 260 79 208 63 165 50 103 31
400 mA 195 59 157 48 124 38 78 24
500 mA 156 48 125 38 99 30 62 19
650 mA 120 37 96 29 76 23 48 15
Table 2-5: External Sounder Wiring Table
NOTE: The wire lengths indicated represent the one-way distance between the ORBIT-Pro and
the external sounder in the branch.
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