EXAMPLE: An enclosure that requires 80 vA and is in- stalled 35 feet (10 m) from the transformer would re- quire a minimum wire gauge of 20 AWG.
NOTE: Wire gauges are standard AWG or metric sizes. Distances are calcu- lated in feet; values in parentheses are meters.
Table A. Video Coaxial Cable Requirements
Cable Type* | Maximum Distance |
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RG59/U | 750 ft (229 m) |
RG6/U | 1,000 ft (305 m) |
RG11/U | 1,500 ft (457 m) |
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*Minimum cable requirements: 75 ohms impedance
Table B. 24 VAC Wiring Distances
The following are the recommended maximum distances for 24 VAC applications and are calculated with a
Wire Gauge
Total | 20 | 18 | 16 | 14 | 12 | 10 |
vA | (0.5 mm2) | (1.0 mm2) | (1.5 mm2) | (2.5 mm2) | (4.0 mm2) | (6.0 mm2) |
10 | 283 | 451 | 716 | 1142 | 1811 | 2880 |
| (86) | (137) | (218) | (348) | (551) | (877) |
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20 | 141 | 225 | 358 | 571 | 905 | 1440 |
| (42) | (68) | (109) | (174) | (275) | (438) |
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30 | 94 | 150 | 238 | 380 | 603 | 960 |
| (28) | (45) | (72) | (115) | (183) | (292) |
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40 | 70 | 112 | 179 | 285 | 452 | 720 |
| (21) | (34) | (54) | (86) | (137) | (219) |
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50 | 56 | 90 | 143 | 228 | 362 | 576 |
| (17) | (27) | (43) | (69) | (110) | (175) |
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60 | 47 | 75 | 119 | 190 | 301 | 480 |
| (14) | (22) | (36) | (57) | (91) | (146) |
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70 | 40 | 64 | 102 | 163 | 258 | 411 |
| (12) | (19) | (31) | (49) | (78) | (125) |
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80 | 35 | 56 | 89 | 142 | 226 | 360 |
| (10) | (17) | (27) | (43) | (68) | (109) |
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90 | 31 | 50 | 79 | 126 | 201 | 320 |
| (9) | (15) | (24) | (38) | (61) | (97) |
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100 | 28 | 45 | 71 | 114 | 181 | 288 |
| (8) | (13) | (21) | (34) | (55) | (87) |
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110 | 25 | 41 | 65 | 103 | 164 | 261 |
| (7) | (12) | (19) | (31) | (49) | (79) |
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120 | 23 | 37 | 59 | 95 | 150 | 240 |
| (7) | (11) | (17) | (28) | (45) | (73) |
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130 | 21 | 34 | 55 | 87 | 139 | 221 |
| (6) | (10) | (16) | (26) | (42) | (67) |
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140 | 20 | 32 | 51 | 81 | 129 | 205 |
| (6) | (9) | (15) | (24) | (39) | (62) |
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150 | 18 | 30 | 47 | 76 | 120 | 192 |
| (5) | (9) | (14) | (23) | (36) | (58) |
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160 | 17 | 28 | 44 | 71 | 113 | 180 |
| (5) | (8) | (13) | (21) | (34) | (54) |
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170 | 16 | 26 | 42 | 67 | 106 | 169 |
| (4) | (7) | (12) | (20) | (32) | (51) |
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180 | 15 | 25 | 39 | 63 | 100 | 160 |
| (4) | (7) | (11) | (19) | (30) | (48) |
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190 | 14 | 23 | 37 | 60 | 95 | 151 |
| (4) | (7) | (11) | (18) | (28) | (46) |
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200 | 14 | 22 | 35 | 57 | 90 | 144 |
| (4) | (6) | (10) | (17) | (27) | (43) |
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Maximum distance from transformer to load
