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4 C488M-A (10/04)
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
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)
110 25
(7)
41
(12)
65
(19)
103
(31)
164
(49)
261
(79)
120 23
(7)
37
(11)
59
(17)
95
(28)
150
(45)
240
(73)
130 21
(6)
34
(10)
55
(16)
87
(26)
139
(42)
221
(67)
140 20
(6)
32
(9)
51
(15)
81
(24)
129
(39)
205
(62)
150 18
(5)
30
(9)
47
(14)
76
(23)
120
(36)
192
(58)
160 17
(5)
28
(8)
44
(13)
71
(21)
113
(34)
180
(54)
170 16
(4)
26
(7)
42
(12)
67
(20)
106
(32)
169
(51)
180 15
(4)
25
(7)
39
(11)
63
(19)
100
(30)
160
(48)
190 14
(4)
23
(7)
37
(11)
60
(18)
95
(28)
151
(46)
200 14
(4)
22
(6)
35
(10)
57
(17)
90
(27)
144
(43)