Electrical regulations and standards
that apply to boat builders and recreational boats. Calculating
Voltage Drop .
This table is from ABYC standards. There are tables for 24 volts and 32 volts, and for AC systems, in the ABYC
Electrical Standard E-11. Contact
ABYC for a copy of E-11, AC and DC
Electrical Systems on Boats.
Table to determine wire size due to voltage drop based on the
length of the wire. This table is for 12 volts only.
Length of conductor from power source to the device and
back to the power source |
Feet |
10 |
15 |
20 |
25 |
30 |
40 |
50 |
60 |
70 |
80 |
90 |
100 |
110 |
120 |
130 |
140 |
150 |
160 |
170 |
Total Amps |
12 volt - 10% drop wire sizes gauge |
5 |
18 |
18 |
18 |
18 |
18 |
16 |
16 |
14 |
14 |
14 |
12 |
12 |
12 |
12 |
12 |
10 |
10 |
10 |
10 |
10 |
18 |
18 |
16 |
16 |
14 |
14 |
12 |
12 |
10 |
10 |
10 |
10 |
8 |
8 |
8 |
8 |
8 |
8 |
6 |
15 |
18 |
16 |
14 |
14 |
12 |
12 |
10 |
10 |
8 |
8 |
8 |
8 |
8 |
6 |
6 |
6 |
6 |
6 |
6 |
20 |
16 |
14 |
14 |
12 |
12 |
10 |
10 |
8 |
8 |
8 |
6 |
6 |
6 |
6 |
6 |
4 |
4 |
4 |
4 |
25 |
16 |
14 |
12 |
12 |
10 |
10 |
8 |
8 |
6 |
6 |
6 |
6 |
6 |
4 |
4 |
4 |
4 |
4 |
2 |
30 |
14 |
12 |
12 |
10 |
10 |
8 |
8 |
6 |
6 |
6 |
6 |
4 |
4 |
4 |
4 |
2 |
2 |
2 |
2 |
40 |
14 |
12 |
10 |
10 |
8 |
8 |
6 |
6 |
6 |
4 |
4 |
4 |
2 |
2 |
2 |
2 |
2 |
2 |
2 |
50 |
12 |
10 |
10 |
8 |
8 |
6 |
6 |
4 |
4 |
4 |
2 |
2 |
2 |
2 |
2 |
1 |
1 |
1 |
1 |
60 |
12 |
10 |
8 |
8 |
6 |
6 |
4 |
4 |
2 |
2 |
2 |
2 |
2 |
1 |
1 |
1 |
0 |
0 |
0 |
70 |
10 |
8 |
8 |
6 |
6 |
6 |
4 |
2 |
2 |
2 |
2 |
1 |
1 |
1 |
0 |
0 |
0 |
2/0 |
2/0 |
80 |
10 |
8 |
8 |
6 |
6 |
4 |
4 |
2 |
2 |
2 |
1 |
1 |
0 |
0 |
0 |
2/0 |
2/0 |
2/0 |
2/0 |
90 |
10 |
8 |
6 |
6 |
6 |
4 |
2 |
2 |
2 |
1 |
1 |
0 |
0 |
0 |
2/0 |
2/0 |
2/0 |
3/0 |
3/0 |
100 |
10 |
8 |
6 |
6 |
4 |
4 |
2 |
2 |
1 |
1 |
0 |
0 |
0 |
2/0 |
2/0 |
2/0 |
3/0 |
3/0 |
3/0 |
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http://newboatbuilders.com/ All Rights Reserved
Revised 05/07/2021
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