**10-gauge wire**.

What size wire do I need for a 50 amp welder?

**wire size for 50 amps 240 volts**.

### Contents

#10 is normally used for short runs of 30 amps. With **150 feet** though, I’d opt at least for #8, and maybe even #6. Go to any standard wire table to find the ohmage of the wire size.

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

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.

**You should not use a 30-amp circuit breaker on a 12-gauge wire**. The circuit breaker installed on a circuit is of a specific size to protect a certain wire gauge. … This higher current can damage the thinner wire, melt the insulation, cause short circuits, fire, and even lethal shock.

Originally Answered: Can an 8-gauge wire handle 30 amps? **Yes, it can**. Under the NFPA Article 70 (National Electrcal Code), #8 wire is rated for 50 amps under certain conditions, however it is usually protected at 40 amps.

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.

You can run a 12 gauge wire up to **70 feet** on a 15 amp circuit. That number drops to 50 feet if you run 12 gauge wire on a 20 amp circuit.

Typically, a 30-amp breaker is designed for heavy-duty appliances like HVACs and water heating systems. Besides, it can only accommodate 30-amp receptacles if it’s a **single-outlet circuit breaker**. If it’s a multi-outlet device, we can install a 20-amp circuit to protect the #10 conductor.

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.

In the breaker panel it’s hooked up to a 30-amp double pole breaker with #12 wire. Inspector notes that **#10 wire** should be used for 30-amp circuits so that the wire does not melt before the breaker can do its job in an over-current situation.

14 AWG | 100 feet |
---|---|

10 AWG | 128 feet |

8 AWG | 152 feet |

6 AWG | 188 feet |

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 |

How far can you run 10 gauge wire for 30 amps? 10-gauge wire is usually used for short 30 amp runs. If you plan on going over **150 feet**, 8-gauge wire or thicker will be needed.

A 20-amp 240-volt circuit calls for **12-gauge wire**; a 30-amp circuit calls for 10-gauge wire; a 40-amp circuit calls for 8-gauge wire; and a 50-amp circuit calls for 6-gauge wire.

Since 8 gauge wires can capably carry 40 amperes, we can determine that the proper size breaker is at **50 A**.

- I = P / V.
- I = 2000W / 120V.
- I = 16.66 A.

Low-voltage (no more than 30 volts) wiring must be buried at least 6 inches **deep**. Buried wiring runs that transition from underground to above ground must be protected in conduit from the required cover depth or 18 inches to its termination point above ground, or at least 8 feet above grade.

Wire Gauge or TypeRated AmperageCommon Uses10-2 Romex30 AElectric water heater, baseboard heaters10-3 Romex30 AElectric Clothes Dryer6/3 Cu Range Cable50 ARange, Heatpump, On-Demand Electric Water heater2 Gauge Copper100 ACentral Electric Heat

for 300 feet for 100 amp rated service I would use **Aluminum direct burial 1/0-1/0-1/0-1/0**, the forth can be as low as #4 for the ground (but also in conduit, even if in conduit must still be rated underground wire and required by code also) Also note the size wire the breaker can handle, cannot cut strands to make fit, …

A 30 amp generator consumes **almost half the fuel** of a 50 amp generator. … If you are not intending on running your central air conditioning or do not have central air then chances are a 30 amp generator is perfect to power your home.

**20 outlets** for 30 amp breaker as a rule of thumb of 1.5 amps per outlet. The 30A rating is to protect the wire and outlet limits does not limit the number of outlets.

A 30 amp plug has three prongs – a **120 volt hot wire**, a neutral wire and a ground wire – and is generally used on RVs with lower load requirements.

It is never a good idea to load up one socket inside your RV with more than 1800 watts at 120 volts. Keeping in mind that a 30 amp plug has approximately 3,600 watts available to play with, it looks like there is enough power to run **one A/C unit, refrigerator, and an electric water heater** at once.

The same **12-gauge wire** can be used for a 220v, 20-amp outlet to run power tools. The cable must have a hot wire. You need a different type of receptacle and 10-gauge cable if the appliance draws 30 Amps.

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

In general, bury metal conduits at **least 6 inches below the soil surface**. You may also run them at a depth of 4 inches under a 4-inch concrete slab. Under your driveway, the conduits must be below a depth of 18 inches, and under a public road or alleyway, they must be buried below 24 inches.

Example calcuation 2 – Copper Wire, 3 Phase power Cable run: **400 ft.** 1 conductor per phase utilizing a 750 kcmil Aluminum conductor installed Direct Buried will limit the voltage drop to 2.64% or less when supplying 194 amps for 400.0 feet on a 240 volt 3 phase system.

A larger conductor means less voltage drop and higher efficiency. Don’t be one of those people who saves money by sizing conductors only as large as you have to (by Code), but then turns around and recommends a big investment in a new lighting system to save energy.

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

Wire Size75°C (167°F)AWG(mm²)Copper1(42.4)**130**1/0(53.5)1502/0(67.4)175

For 30 amp RVs, you’ll need: **30a female to 15a male**. Remove the 30 amp plug from the generator plug, like you would at an RV campground. Then plug it into this adapter. Then you can plug the adapter into your heavy duty outdoor extension cord.