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Pelco Manual C1431M-C (8/04)
11
Wire Gauge
Maximum distance from transformer to load
Table A.  24 VAC Wiring Distances
The following are the recommended maximum distances for 24 VAC applications
and are calculated with a 10-percent voltage drop. (10-percent is generally the maxi-
mum allowable voltage drop for AC-powered devices.)
Total VA 20 AWG
18 AWG
16AWG
14 AWG
12 AWG
10 AWG
(0.5 mm
2
) (1.0 mm
2
) (1.5 mm
2
) (2.5 mm
2
) (4.0 mm
2
) (6.0 mm
2
)
10
283
451
716
1142
1811
2880
(86)
(137)
(218)
(348)
(551)
(877)
20
141
225
358
571
905
1440
(42)
(68)
(109)
(174)
(275)
(438)
30
94
150
238
380
603
960
(28)
(45)
(72)
(115)
(183)
(292)
40
70
112
179
285
452
720
(21)
(34)
(54)
(86)
(137)
(219)
50
56
90
143
228
362
576
(17)
(27)
(43)
(69)
(110)
(175)
60
47
75
119
190
301
480
(14)
(22)
(36)
(57)
(91)
(146)
70
40
64
102
163
258
411
(12)
(19)
(31)
(49)
(78)
(125)
80
35
56
89
142
226
360
(10)
(17)
(27)
(43)
(68)
(109)
90
31
50
79
126
201
320
(9)
(15)
(24)
(38)
(61)
(97)
100
28
45
71
114
181
288
(8)
(13)
(21)
(34)
(55)
(87)
110
25
41
65
103
164
261
(7)
(12)
(19)
(31)
(49)
(79)
120
23
37
59
95
150
240
(7)
(11)
(17)
(28)
(45)
(73)
130
21
34
55
87
139
221
(6)
(10)
(16)
(26)
(42)
(67)
140
20
32
51
81
129
205
(6)
(9)
(15)
(24)
(39)
(62)
150
18
30
47
76
120
192
(5)
(9)
(14)
(23)
(36)
(58)
160
17
28
44
71
113
180
(5)
(8)
(13)
(21)
(34)
(54)
170
16
26
42
67
106
169
(4)
(7)
(12)
(20)
(32)
(51)
180
15
25
39
63
100
160
(4)
(7)
(11)
(19)
(30)
(48)
190
14
23
37
60
95
151
(4)
(7)
(11)
(18)
(28)
(46)
200
14
22
35
57
90
144
(4)
(6)
(10)
(17)
(27)
(43)
T
otal vA
 consumed
EXAMPLE:
 An enclosure that re-
quires 80 vA and is installed 35 feet
(10 m) from the transformer would
require a minimum wire gauge of
20 AWG.
NOTE:
 
Distances are calculated in
feet; values in parentheses are
meters.