Low Voltage Landscape Lighting
Voltage Drop Per 10 Linear Feet Of Cable
LAMP POWER
FLOWING IN
CABLE SECTION
(WATTS @12V) |
|
WIRE GAUGE (AWG), CLASS K COPPER |
|
18 |
16 |
12 |
10 |
8 |
FLOW
(AMPS) |
WIRE RESISTANCE (Ohms/10' of cable, both conductors) @ 77 °F (25 °C) |
0.1358 |
0.0852 |
0.0336 |
0.0212 |
0.0136 |
20 |
1.67 |
0.226 |
0.142 |
0.056 |
0.035 |
0.023 |
25 |
2.08 |
0.283 |
0.178 |
0.070 |
0.044 |
0.028 |
30 |
2.50 |
0.340 |
0.213 |
0.084 |
0.053 |
0.034 |
35 |
2.92 |
0.396 |
0.249 |
0.098 |
0.062 |
0.040 |
40 |
3.33 |
0.453 |
0.284 |
0.112 |
0.071 |
0.045 |
45 |
3.75 |
0.509 |
0.320 |
0.126 |
0.080 |
0.051 |
50 |
4.17 |
0.566 |
0.355 |
0.140 |
0.088 |
0.057 |
55 |
4.58 |
0.622 |
0.391 |
0.154 |
0.097 |
0.062 |
60 |
5.00 |
0.679 |
0.426 |
0.168 |
0.106 |
0.068 |
65 |
5.42 |
0.736 |
0.462 |
0.182 |
0.115 |
0.074 |
70 |
5.83 |
0.792 |
0.497 |
0.196 |
0.124 |
0.079 |
75 |
6.25 |
0.849 |
0.533 |
0.210 |
0.133 |
0.085 |
80 |
6.67 |
0.905 |
0.568 |
0.224 |
0.141 |
0.091 |
85 |
7.08 |
0.962 |
0.604 |
0.238 |
0.150 |
0.096 |
90 |
7.50 |
1.019 |
0.639 |
0.252 |
0.159 |
0.102 |
95 |
7.92 |
1.075 |
0.675 |
0.266 |
0.168 |
0.108 |
100 |
8.33 |
- |
0.710 |
0.280 |
0.177 |
0.113 |
105 |
8.75 |
- |
0.746 |
0.294 |
0.186 |
0.119 |
110 |
9.17 |
- |
0.781 |
0.308 |
0.194 |
0.124 |
115 |
9.58 |
- |
0.817 |
0.322 |
0.203 |
0.130 |
120 |
10.00 |
- |
0.852 |
0.336 |
0.212 |
0.136 |
125 |
10.42 |
- |
- |
0.350 |
0.221 |
0.141 |
130 |
10.83 |
- |
- |
0.364 |
0.230 |
0.147 |
135 |
11.25 |
- |
- |
0.378 |
0.239 |
0.153 |
140 |
11.67 |
- |
- |
0.392 |
0.247 |
0.158 |
145 |
12.08 |
- |
- |
0.406 |
0.256 |
0.164 |
150 |
12.50 |
- |
- |
0.420 |
0.265 |
0.170 |
155 |
12.92 |
- |
- |
0.434 |
0.274 |
0.175 |
160 |
13.33 |
- |
- |
0.448 |
0.283 |
0.181 |
165 |
13.75 |
- |
- |
0.462 |
0.292 |
0.187 |
170 |
14.17 |
- |
- |
0.476 |
0.300 |
0.192 |
175 |
14.58 |
- |
- |
0.490 |
0.309 |
0.198 |
180 |
15.00 |
- |
- |
0.504 |
0.318 |
0.204 |
185 |
15.42 |
- |
- |
0.518 |
0.327 |
0.209 |
190 |
15.83 |
- |
- |
0.532 |
0.336 |
0.215 |
195 |
16.25 |
- |
- |
0.546 |
0.345 |
0.221 |
200 |
16.67 |
- |
- |
0.560 |
0.353 |
0.226 |
205 |
17.08 |
- |
- |
0.574 |
0.362 |
0.232 |
210 |
17.50 |
- |
- |
0.588 |
0.371 |
0.238 |
215 |
17.92 |
- |
- |
0.602 |
0.380 |
0.243 |
220 |
18.33 |
- |
- |
0.616 |
0.389 |
0.249 |
225 |
18.75 |
- |
- |
0.630 |
0.398 |
0.255 |
230 |
19.17 |
- |
- |
0.644 |
0.406 |
0.260 |
235 |
19.58 |
- |
- |
0.658 |
0.415 |
0.266 |
240 |
20.00 |
- |
- |
0.672 |
0.424 |
0.272 |
note: |
- Do not use a cable whose ampacity is less than the rating of
the transformer circuit breaker.
- Above chart shows voltage drops for maximum flows of 80% of
the cables' ampacities.
- Above chart shows voltage drops for maximum wattage of 240
watts (80% of 300 watt transformer circuit rating.)
|