C288M-G (8/05) 9
Wiring Tables Table A.
Video Coaxial Cable Requirements
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.)
Table B.
24 VAC Wiring Distances
EXAMPLE:
An enclosure that requires 80 VA and is installed 35 feet (10 m) from the transformer would require a minimum wire gauge
of 20 AWG.
NOTE:
Wire gauges are standard AWG or metric sizes. Distances are calculated in feet; values in parentheses are meters.
Cable Type
*
*Minimum cable requirements:
75 ohms impedance
All-copper center conductor
All-copper braided shield with 95% braid coverage
Maximum Distance
RG59/U
RG6/U
RG11/U
750 ft (229 m)
1,000 ft (305 m)
1,500 ft (457 m)
Wire Gauge
Total
VA
20
(0.5 mm
2
)
18
(1.0 mm
2
)
16
(1.5 mm
2
)
14
(2.5 mm
2
)
12
(4.0 mm
2
)
10
(6.0 mm
2
)
10 283
(86)
451
(137)
716
(218)
1142
(348)
1811
(551)
2880
(877)
Maximum distance from transformer to load
20 141
(42)
225
(68)
358
(109)
571
(174)
905
(275)
1440
(438)
30 94
(28)
150
(45)
238
(72)
380
(115)
603
(183)
960
(292)
40 70
(21)
112
(34)
179
(54)
285
(86)
452
(137)
720
(219)
50 56
(17)
90
(27)
143
(43)
228
(69)
362
(110)
576
(175)
60 47
(14)
75
(22)
119
(36)
190
(57)
301
(91)
480
(146)
70 40
(12)
64
(19)
102
(31)
163
(49)
258
(78)
411
(125)
80 35
(10)
56
(17)
89
(27)
142
(43)
226
(68)
360
(109)
90 31
(9)
50
(15)
79
(24)
126
(38)
201
(61)
320
(97)
100 28
(8)
45
(13)
71
(21)
114
(34)
181
(55)
288
(87)