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7 Appendix 2 The Relationship between the 24V AC Cable
Diameter and the Transmission Distance
It is the recommended transmission distance when the cable diameter is fixed and the 24V AC power
consumption is below 10%. For the AC device, the max permission voltage power consumption is 10%.
For example, when a device of rated power 80VA installed from the transformer 35 inches (10m), then
the min cable diameter is 0.8000mm.
mm
Feet（m）
W
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
0.8000
283 (86)
451 (137)
141 (42)
225 (68)
94 (28)
150 (45)
70 (21)
112 (34)
56 (17)
47 (14)
40 (12)
35 (10)
31 (9)
28 (8)
25 (7)
23 (7)
21 (6)
20 (6)
18 (5)
17 (5)
16 (4)
15 (4)
14 (4)
22 （6)
14 (4)
1.000
716 (218)
358 (109)
238 (72)
179 (54)
90 (27)
143 (43)
75 (22)
119 (36)
64 (19)
102 (31)
56 (17)
89 (27)
50 (15)
79 (24)
45 (13)
71 (21)
41 (12)
65 (19)
37 (11)
59 (17)
34 (10)
55 (16)
32 (9)
51 (15)
30 (9)
47 (14)
28 (8)
44 (13)
26 (7)
42 (12)
25 (7)
39 (11)
23 (7)
37 (11)
35 (10)
28
1.250
2.000
1811 (551)
905 (275)
603 (183)
452 (137)
362 (110)
301 (91)
258 (78)
226 (68)
201 (61)
181 (55)
164 (49)
150 (45)
139 (42)
129 (39)
120 (36)
113 (34)
106 (32)
100 (30)
95 (28)
90 (27)
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