Voltage Drop Information
Low Voltage Systems are safe and easy to install, however, long wire runs, or wire that is too small for the circuit, can result in reduced light output.
Use the Voltage Drop Charts below to help you select the proper wire size and transformer output taps to ensure that a full 12V is being delivered to the light fixture.
8/2 Wire Voltage Drop Chart
| Watts |
35 |
70 |
100 |
110 |
120 |
130 |
140 |
150 |
175 |
200 |
225 |
250 |
275 |
| Amps |
2.9 |
5.8 |
8.3 |
9.2 |
10.0 |
10.8 |
11.7 |
12.5 |
14.6 |
16.7 |
18.8 |
20.8 |
22.9 |
| 20ft |
0.7 |
0.15 |
0.21 |
0.24 |
0.26 |
0.28 |
0.30 |
0.32 |
0.37 |
0.43 |
0.48 |
0.53 |
0.59 |
| 40ft |
0.15 |
0.30 |
0.42 |
0.47 |
0.51 |
0.55 |
0.60 |
0.64 |
0.75 |
0.86 |
0.96 |
1.06 |
1.17 |
| 60ft |
0.22 |
0.45 |
0.64 |
0.71 |
0.77 |
0.83 |
0.90 |
0.96 |
1.12 |
1.28 |
1.44 |
1.60 |
1.76 |
| 80ft |
0.30 |
0.59 |
0.85 |
0.94 |
1.02 |
1.11 |
1.20 |
1.28 |
1.50 |
1.71 |
1.93 |
2.13 |
2.34 |
| 100ft |
0.37 |
0.74 |
1.06 |
1.18 |
1.28 |
1.38 |
1.50 |
1.60 |
1.87 |
2.14 |
2.41 |
2.66 |
2.93 |
| 125ft |
0.46 |
0.93 |
1.33 |
1.47 |
1.60 |
1.73 |
1.87 |
2.00 |
2.34 |
2.67 |
3.01 |
3.33 |
3.66 |
| 150ft |
0.56 |
1.11 |
1.59 |
1.77 |
1.92 |
2.07 |
2.25 |
2.40 |
2.80 |
3.21 |
3.61 |
3.99 |
4.40 |
| 175ft |
0.65 |
1.30 |
1.86 |
2.06 |
2.24 |
2.42 |
2.62 |
2.80 |
3.27 |
3.74 |
4.21 |
4.66 |
5.13 |
| 200ft |
0.74 |
1.48 |
2.12 |
2.36 |
2.56 |
2.76 |
3.00 |
3.20 |
3.74 |
4.28 |
4.81 |
5.32 |
|
| 225ft |
0.84 |
1.67 |
2.39 |
2.65 |
2.88 |
3.11 |
3.37 |
3.60 |
4.20 |
4.81 |
5.41 |
|
| 250ft |
0.93 |
1.86 |
2.66 |
2.94 |
3.20 |
3.46 |
3.74 |
4.00 |
4.67 |
5.34 |
|
| 275ft |
1.02 |
2.04 |
2.92 |
3.24 |
3.52 |
3.80 |
4.12 |
4.40 |
5.14 |
|
| 300ft |
1.11 |
2.23 |
3.19 |
3.53 |
3.84 |
4.15 |
4.49 |
4.80 |
|
10/2 Wire Voltage Drop Chart
| Watts |
35 |
70 |
100 |
110 |
120 |
130 |
140 |
150 |
175 |
200 |
225 |
250 |
275 |
| Amps |
2.9 |
5.8 |
8.3 |
9.2 |
10.0 |
10.8 |
11.7 |
12.5 |
14.6 |
16.7 |
18.8 |
20.8 |
22.9 |
| 20ft |
0.13 |
0.25 |
0.36 |
0.40 |
0.43 |
0.47 |
0.51 |
0.54 |
0.63 |
0.72 |
0.81 |
0.90 |
0.99 |
| 40ft |
0.25 |
0.50 |
0.72 |
0.79 |
0.86 |
0.93 |
1.01 |
1.08 |
1.26 |
1.44 |
1.62 |
1.80 |
1.98 |
| 60ft |
0.38 |
0.75 |
1.08 |
1.19 |
1.30 |
1.40 |
1.52 |
1.62 |
1.89 |
2.16 |
2.44 |
2.70 |
2.97 |
| 80ft |
0.50 |
1.00 |
1.43 |
1.59 |
1.73 |
1.87 |
2.02 |
2.16 |
2.52 |
2.89 |
3.25 |
3.59 |
3.96 |
| 100ft |
0.63 |
1.25 |
1.79 |
1.99 |
2.16 |
2.33 |
2.53 |
2.70 |
3.15 |
3.61 |
4.06 |
4.49 |
4.95 |
| 125ft |
0.78 |
1.57 |
2.24 |
2.48 |
2.70 |
2.92 |
3.16 |
3.38 |
3.94 |
4.51 |
5.08 |
5.62 |
6.18 |
| 150ft |
0.94 |
1.88 |
2.69 |
2.98 |
3.24 |
3.50 |
3.79 |
4.05 |
4.73 |
5.41 |
|
| 175ft |
1.10 |
2.19 |
3.14 |
3.48 |
3.78 |
4.08 |
4.34 |
4.73 |
5.52 |
|
| 200ft |
1.25 |
2.51 |
3.59 |
3.97 |
4.32 |
4.67 |
5.05 |
5.40 |
|
| 225ft |
1.41 |
2.82 |
4.03 |
4.47 |
4.86 |
5.25 |
|
| 250ft |
1.57 |
3.13 |
4.48 |
4.97 |
5.40 |
|
| 275ft |
1.72 |
3.45 |
4.93 |
5.46 |
|
| 300ft |
1.88 |
3.76 |
5.38 |
|
12/2 Wire Voltage Drop Chart
| Watts |
18 |
35 |
50 |
70 |
100 |
110 |
120 |
130 |
140 |
150 |
160 |
170 |
180 |
| Amps |
1.5 |
2.9 |
4.2 |
5.8 |
8.3 |
9.2 |
10.0 |
10.8 |
11.7 |
12.5 |
13.3 |
14.2 |
15.0 |
| 20ft |
0.10 |
0.19 |
0.27 |
0.38 |
0.54 |
0.60 |
0.65 |
0.70 |
0.76 |
0.81 |
0.86 |
0.92 |
0.97 |
| 40ft |
0.19 |
0.38 |
0.54 |
0.75 |
1.08 |
1.19 |
1.30 |
1.40 |
1.52 |
1.62 |
1.72 |
1.84 |
1.94 |
| 60ft |
0.29 |
0.56 |
0.82 |
1.13 |
1.61 |
1.79 |
1.94 |
2.10 |
2.27 |
2.43 |
2.59 |
2.76 |
2.92 |
| 80ft |
0.39 |
0.75 |
1.09 |
1.50 |
2.15 |
2.38 |
2.59 |
2.80 |
3.03 |
3.24 |
3.45 |
3.68 |
3.89 |
| 100ft |
0.49 |
0.94 |
1.36 |
1.88 |
2.69 |
2.98 |
3.24 |
3.50 |
3.79 |
4.05 |
4.31 |
4.60 |
4.86 |
| 125ft |
0.61 |
1.17 |
1.70 |
2.35 |
3.36 |
3.73 |
4.05 |
4.37 |
4.74 |
5.06 |
5.39 |
5.75 |
6.08 |
| 150ft |
0.73 |
1.41 |
2.04 |
2.82 |
4.03 |
4.47 |
4.86 |
5.25 |
5.69 |
|
| 175ft |
0.85 |
1.64 |
2.38 |
3.29 |
4.71 |
5.22 |
5.67 |
|
| 200ft |
0.97 |
1.88 |
2.72 |
3.76 |
5.38 |
|
| 225ft |
1.09 |
2.11 |
3.06 |
4.23 |
|
| 250ft |
1.22 |
2.35 |
3.40 |
4.70 |
|
| 275ft |
1.34 |
2.58 |
3.74 |
5.17 |
|
| 300ft |
1.46 |
2.82 |
4.08 |
|
|
