13
5 Cable Diameter (24V AC) and Transmission
Distance
The recommended transmission distances are for reference only, and the actual conditions
shall prevail. The following table shows the maximum transmission distance of cables with
certain diameter when the 24V AC power source voltage loss rate is below 10%.
For devices powered by alternating current, the maximum voltage loss rate allowed is 10%.
For example, when a device of 20W rated power is installed 122 feet (37 m) away from the
transformer, the minimum diameter needed is 0.80 mm.
In the following table, the unit for diameter is mm, and the unit for transmission distance is foot
(m).
Table 5-1 Cable diameter (24V AC) and transmission distance
Transmission
Power (W)
Transmission
Distance
(Diameter:
0.80)
Transmission
Distance
(Diameter:
1.00)
Transmission
Distance
(Diameter:
1.25)
Transmission
Distance
(Diameter:
2.00)
5 489 (149) 763 (233) 1193 (364) 3053 (931)
10 244 (74) 382 (116) 596 (182) 1527 (465)
15 163 (50) 254 (77) 398 (121) 1018 (310)
20 122 (37) 191 (58) 298 (91) 763 (233)
25 98 (30) 152 (47) 239 (73) 611 (186)
30 81 (25) 127 (39) 199 (61) 509 (155)
35 70 (21) 109 (33) 170 (52) 436 (133)
40 61 (19) 95 (29) 149 (45) 382 (116)
45 54 (16) 85 (26) 133 (41) 339 (103)
50 49 (15) 76 (23) 119 (36) 305 (93)
55 44 (13) 69 (21) 108 (33) 278 (85)
60 41 (12) 64 (20) 99 (30) 254 (77)
65 38 (12) 59 (18) 92 (28) 235 (72)
70 35 (11) 55 (17) 85 (26) 218 (66)
75 32 (10) 51 (16) 80 (24) 204 (62)
80 31 (9) 48 (15) 75 (23) 191 (58)
85 29 (9) 45 (14) 70 (21) 180 (55)
90 27 (8) 42 (13) 66 (20) 170 (52)
95 26 (8) 40 (12) 63 (19) 161 (49)
100 24 (7) 38 (12) 59 (18) 153 (47)
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