# How big of a wire do I need for 30 amps?

## How big of a wire do I need for 30 amps?

10

For a maximum of 30 amps, you’ll need a wire gauge of 10. The most common household item that requires a 30 amp circuit is a central air conditioner.

## How far can you run 10 gauge wire for 30 amps?

How far can 10 gauge wire carry 30 amps? 30 amps carried over a 10 gauge wire is not meant to be run over far distances. If you plan on going over 150 feet, you should upgrade the wire size from 10 gauge to 8 gauge.

**How many amps can a 12 2 wire handle?**

30 amps

Maximum Breaker Size is 30 amps. You can use a 20 amp circuit breaker with 12/2 Romex as 12/2 wire is rated for 20 amps.

### What size wire do I need for 50 amps?

According to the American Wire Gauge system, the appropriate wire gauge to use in conjunction with a 50-amp breaker is a 6-gauge wire. The 6-gauge copper conductor wire is rated up to 55 amps, making it the perfect choice for this circuit.

### What gauge wire is required for a 20 amp circuit?

12-gauge

A 20-amp circuit, protected by a 20-amp breaker or fuse, must be served by 12-gauge or 10-gauge wire.

**What can you run on 30 amps?**

In a typical RV with a 30 amp electrical service some of the power hungry appliances and portable devices are the air conditioner, electric water heater, microwave, coffee maker, electric skillet, hair dryer, space heaters and a toaster.

## How do I calculate what size wire I need?

How do you determine cable wire size? Divide the voltage running through the cable by your target current. If, for instance, 120 volts will act on the cable, and you want 30 amps to run through it: 120 / 30 = 4. This is your target resistance, measured in ohms.

## Will a 12 2 wire carry 30 amps?

No. 12 gauge wire is rated for a maximum of 20 amps. You need a minimum of 10AWG wire for 30 amps.

**What is the difference between 12 2 and 12 3 Romex?**

The first number indicates the gauge of the wire. A 12-2 Romex will have a black(hot) and a white(neutral) wire as well as an unsheathed copper wire for ground. A 12-3 Romex will have a black(hot), red(hot), white(neutral), and bare copper. The red on a 12-3 is used for three-way light switches which are covered later.

### How many amps is number 8 Romex good for?

Size & AMP Ratings

NM, TW, & UF WIRE (Copper Conductor) | SE CABLE (Copper Conductor) |
---|---|

12 AWG – 20 AMPS | 6 AWG – 65 AMPS |

10 AWG – 30 AMPS | 4 AWG – 85 AMPS |

8 AWG – 40 AMPS | 2 AWG – 115 AMPS |

6 AWG – 55 AMPS | 1 AWG – 130 AMPS |

### Will #8 wire carry 50 amps?

8-gauge copper will handle fifty amps, but it will get hot (75 degrees C).

**Can 8 gauge wire handle 50 amps?**

8 AWG may carry a maximum of 70 Amps in free air, or 50 Amps as part of a 3 conductor cable.

## What is the correct size wire for 60 amp service?

For 60-amp electrical service, 6-gauge copper or aluminum wire is the correct size to power such devices as electric furnaces and large electric heaters. A 50-amp circuit breaker or fuse box can also be powered by 6-gauge wire.

## What is the temperature rating of wire?

The temperature rating of a conductor is a maximum temperature, at any location along its length, that the conductor can withstand over a prolonged period of time without serious degradation. For conventional building wire and cable the most common ratings are 60°, 75° and 90° centigrade.

**What size wire do you need for a 20 amp?**

Amperage and Wire Gauge. Building codes based on the National Electrical Code prohibit the use of 14-gauge wire anywhere on a 20-amp circuit. All wiring in such circuits must be 12-gauge or larger.

### What is the ampacity for 8 AWG wire?

The ampacity of 8 AWG is 40A if you are intending to use NMC cable for this application. Now even if the terminals are rated for 75 degrees you would be sizing based on 60 degrees because of if being NMC. Now be it other than NMC and you have some options…..be it NMC you are limited to the 60 degrees maximum. 334.80 Ampacity.