# What size wire do i need for 45 amps

## Can 10 gauge wire handle 45 amps?

No. You need at least 8 gauge wire for 50 Amps. ! 0 gauge is for 30 Amps, 12 gauge is for 20 Amps, 14 gauge is for 15 Amps, etc. And that is minimum.

## What size wire carries 40 amps?

8

For a maximum of 40 amps, you’ll need a

**wire gauge of 8**. Many electric cooking appliances require 40 amps such as electric cooktops.## 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 wire do I use for a 40 amp breaker?

The rule of thumb that techs will usually go by is that for a 30 amp circuit breaker, 10-gauge wire is the right one to go with. For a 40 amp you need a

**8-gauge wire**. For a 20 amp, you will need a 12-gauge wire.## What wire do you use 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.## 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 |

## What size wire do I need to run a 50 amp sub panel?

For example,

**6-3G cable**is designed for 50 amps when the length of wire does not exceed 55 feet. Beyond that length, a thicker wire is required, due to the voltage drop.## How many amps is 1 ought wire good for?

Wire Size and Amp Ratings

Wire Size | 75°C (167°F) | |
---|---|---|

AWG | (mm²) | Copper |

1 | (42.4) | 130 |

1/0 | (53.5) | 150 |

2/0 | (67.4) | 175 |

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

#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.## 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 far can you run 240 volt wire?

As an example, for a 120-volt circuit, you can run up to 50 feet of 14 AWG cable without exceeding 3 percent voltage drop.

…

For 240-volt circuits:

…

For 240-volt circuits:

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

10 AWG | 128 feet |

8 AWG | 152 feet |

6 AWG | 188 feet |

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Apr 30, 2021

## 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.## Can 10 gauge wire handle 40 amps?

“Twelve-gauge wire is good for 20 amps,

**10-gauge wire is good for 30 amps**, 8-gauge is good for 40 amps, and 6-gauge is good for 55 amps,” and “The circuit breaker or fuse is always sized to protect the conductor [wire].”## What size wire do I need to run 300 feet?

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, …## How do I determine what size wire and breaker I need?

The general rule of thumb is that circuit breaker size should

…

**be 125% of the ampacity of cable and wire**or the circuit which has to be protected by the CB.…

**According to the ohm’s law,**- I = P / V.
- I = 2000W / 120V.
- I = 16.66 A.

## How far can I run 12 2 wire?

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.## What wire do you use for 100 amps?

When it comes to the lines connecting master and secondary panels, where the line will carry as much as a full 100 amps, use a

**2-gauge non-metallic sheathed electrical cable**. The cable must contain one or two hot wires depending on your needs, one neutral wire, and one ground wire. Each wire should be 2-gauge in size.## How far can you run #2 copper wire?

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.

## What wire size do I need to go 100 feet for a 60 amp service to a workshop?

For 60 amps

**#6 wire**is the right size. Use RHW or THHN type insulation.## What size wire do I need to run a 100 amp subpanel?

#4

The cable must have a wire gauge sufficient to the amperage of the subpanel—a 100-amp subpanel requires

**#4 copper wires**or, more commonly, #2 aluminum wires, for example.## What size wire do I need for 60 amps?

6 AWG

For 60 ampere breakers, electricians and professionals suggest using a wire size gauge

**ranging from 6 AWG to 4 AWG**. All household wires have a rating of at least 600V, so only amperage really matters when it comes to determining wire gauge.