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14 C478M-M (1/06)
Example: An enclosure that requires 30 VA and is installed 94 feet (28 m) from the transformer
would require a minimum wire gauge of 20 AWG.
NOTE:
Distances are calculated in feet; values in parentheses are meters
.
*Minimum Cable Requirements
75 Ohms Impendance
All-copper center conductor
All-copper braided shield with
95% braid coverage
Table B.
24 VAC Wiring Distances
The following are the recommended maximum distances for 24 VAC applications and are
calculated with a 10 percent voltage drop. (Ten percent is generally the maximum allowable voltage
drop for AC-powered devices.)
Wire Gauge
Total VA
20 AWG
(0.5 mm
2
)
18 AWG
(1.0 mm
2
)
16 AWG
(1.5 mm
2
)
14 AWG
(2.5 mm
2
)
12 AWG
(4.0 mm
2
)
10
283 (86) 451 (137) 716 (218) 1142 (348) 1811 (551)
Maximum distance from
transformer to load
20
141 (42) 225 (68) 358 (109) 571 (174) 905 (275)
30
94 (28) 150 (45) 238 (72) 380 (115) 603 (183)
40
70 (21) 112 (34) 179 (54) 285 (86) 452 (137)
50
56 (17) 90 (27) 143 (43) 228 (69) 362 (110)
Table C.
Video Coaxial Cable Wiring Distances
Cable Type*
Maximum
Distance
RG59/U
RG6/U
RG11/U
750 ft (229 m)
1,000 ft (305 m)
1,500 ft (457 m)