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ELECTRICAL SYSTEMS
Voltage Drop

This table is from ABYC. There are tables for 24 volts and 32 volts, and for AC systems.  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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