## How do I know what size DC wire I need?

Follow down the column until you find your circuit’s LENGTH IN FEET. D Intersect CURRENT IN AMPS with LENGTH IN FEET to identify the wire size. Example: A windlass rated 80A is 25′ from the battery. Circuit length is 50′, circuit type is ‘non-critical’, and correct wire size is 4 AWG.

## How much DC current can 12 gauge wire handle?

Maximum current (amps) in a 12V electrical circuit vs. size (AWG) and length of wire.

American Wire Gauge (#AWG) | ||
---|---|---|

Length (feet) | Maximum Current (amps) | |

30 | 12 | 8 |

40 | 12 | 6 |

50 | 10 | 6 |

**Can I use AC wire for DC?**

You can definitely use it. Please consider the resistance of the cable. The ohmic losses will reduce the 24 V supply voltage to a lower level at the remote end. If the resistance is 5 ohms for example, in total ohmic losses will be twice the 5 ohms multiplied by the DC current.

**How far can you run 24V DC?**

24V AC Power Drop / Max Cable Distance Chart

24 AWG | 20 AWG | |
---|---|---|

10 VA (417mA) | 103 feet | 286 feet |

20 VA (833mA) | 52 feet | 142 feet |

30 VA (1,250mA) | 34 feet | 95 feet |

40 VA (1,667mA) | 26 feet | 71 feet |

### How much voltage drop is acceptable?

5%

How Much Voltage Drop is Acceptable? The National Electrical Code says that a voltage drop of 5% at the furthest receptacle in a branch wiring circuit is passable for normal efficiency.

### Why is DC current not used in homes?

Direct current is not used at home because for the same value of the voltage, DC is more lethal than AC since direct current does not go through zero. Electrolytic corrosion is more an issue with direct current. DC inductors are more complicated. It requires commutators, electronic switches and brushes.

**What gauge wire to use for 12 volts?**

12 Volt Wiring: Wire Gauge to Amps

Amps @ 13.8 Volts | LENGTH OF WIRE American Wire Gauge (AWG) | |
---|---|---|

0-10 | 16-ga. | 14-ga. |

10–15 | 14-ga. | 12-ga. |

15-20 | 12-ga. | 12-ga. |

20-35 | 12-ga. | 10-ga. |

**How far can you run 10 gauge wire on a 20 amp circuit?**

How Far Can You Run 10 Gauge Wire? You can run a 10 gauge wire up to 85 feet on a 20 amp circuit. If you opt to use this type of wire on a 15 amp circuit, it can run up to 115 feet. After these distances, the circuit will go over the recommended 3% voltage drop.