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Wire Size Chart Chart suggest minimum wire size for your application (Battery to Alternator) System Voltage | amperage | 0- 5 ft | 5-10 ft | 10-15 ft | 15-20 ft | 20-25 ft | 25-30 ft | | 12 volt | 0-60 | 8 AWG | 4 AWG | 2 AWG | 2 AWG | 1 AWG | 0 AWG | | 12 volt | 60-100 | 6 AWG | 4 AWG | 1 AWG | 0 AWG | 0 AWG | 2/0 AWG | | 12 volt | 100-150 | 4 AWG | 2 AWG | 0 AWG | 2/0 AWG | 2/0 AWG | 3/0 AWG | | 12 volt | 150-190 | 4 AWG | 1 AWG | 2/0 AWG | 3/0 AWG | 4/0 AWG | 4/0 AWG | | 12 volt | 190-250 | 2 AWG | 0 AWG | 2/0 AWG | 4/0 AWG | 4/0 AWG | 4/0 AWG | | 12 volt | 250-300 | 0 AWG | 2/0 AWG | 3/0 AWG | 4/0 AWG | 4/0 AWG | 4/0 AWG | | 24 volt | 0-30 | 14 AWG | 14 AWG | 10 AWG | 8 AWG | 8 AWG | 6 AWG | | 24 volt | 30-50 | 12 AWG | 10 AWG | 8 AWG | 6 AWG | 6 AWG | 4 AWG | | 24 volt | 50-75 | 10 AWG | 8 AWG | 6 AWG | 4 AWG | 4 AWG | 2 AWG | | 24 volt | 75-100 | 6 AWG | 6 AWG | 4 AWG | 4 AWG | 2 AWG | 1 AWG | | 24 volt | 100-125 | 4 AWG | 4 AWG | 4 AWG | 2 AWG | 2 AWG | 1 AWG | | 24 volt | 125-150 | 2 AWG | 2 AWG | 1 AWG | 1 AWG | 0 AWG | 0 AWG |
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