60 Amp Wire Size: Wire Gauge for 60 Amp Breaker or Subpanel

There will come a time when you need a 60 amp wire size for some electrical work. Maybe you are adding a sub panel, appliance circuits, or replacing an old 60-amp circuit breaker box. Knowing how to wire 60 amps is essential, no matter the project.

We will walk through the following when adding a new or updating an existing 60 amp circuit:

  • What wire size (wire gauge) do you need for a 60A breaker?
  • Wire thickness for AWG wire sizes.
  • Understanding wire ampacity and load
  • To wire 60 amps, do you need to install a new subpanel?
  • How length affects voltage drop for 60 amp circuits.
  • Is 6 AWG or 4 AWG best for 60 amps?

When wiring a 60-amp 220v breaker, licensed electricians often use a 4 AWG wire size gauge for extra security, but a 6 AWG wire can handle the load.

60 Amp Wire Size

What Wire Size is Needed for a 60-Amp Breaker?

You might wonder about calculating wire size, especially if you want to add more circuits to your home. The appropriate size for a 60-amp breaker is between 6 AWG and 4 AWG (American Wire Gauge).

As mentioned above, licensed electricians recommend using a wire size between 6 gauge and 4 gauge. You must increase the wire thickness if you intend to use aluminum wire. Since almost all residential cables are rated at least 600V, amperage is the only factor determining wire gauge. 

For instance, the wire size for a 220v, 60-amp falls between 6 AWG and 4 AWG size. 

The main difference between 4 AWG and 6 AWG wires is their size and ampacity. 4 AWG wire is larger and can carry more current (approximately 85 amps) than 6 AWG wire (approximately 55 amps).

For example, a 4 gauge copper wire size can comfortably have 60 amps of power. At the same time, a 6 gauge can not provide the same voltage without exceeding its capacity and potentially overheating. 

We have a residential electric load calculator that will help determine the ampacity you need.

Related Reading: Wire Size for 100 Amp Electric Service: Complete Guide

Why Is Wire Size Important?

Getting the correct wire size is critical in any breaker due to safety. The right size wire of a breaker determines whether the conductors of the wire will handle the amperage flowing through it

If the wire you install can’t handle the amperage, it might melt accidentally or even burn, causing a fire. 

For the above reason, it’s essential to understand the size of wires and their actual capacity to carry an amperage load. It’s common knowledge that larger and thicker wire sizes can handle higher amperage loads than smaller and thinner wires. 

Thicker wire sizes can mitigate the extra heat the electrical current flows through the cable. 

What is Wire Ampacity?

Amps refer to the electric current flowing through a circuit. This is measured in amperes (A), or amps for short. The higher the wire gauge, the more amps the wire can carry.

Wire ampacity refers to the maximum electric current a wire can safely carry without exceeding its ambient temperature rating. The ampacity of a wire is determined by factors such as its gauge, insulation type, ambient temperature, and intended use.

The National Electrical Code (NEC) guidelines for the maximum ampacity allow for different electrical wire sizes and insulation types. When choosing the correct wire size for a 60 amp circuit breaker or sub-panel, ensuring that the wire’s ampacity is equal to or greater than 60 amps to handle the load safely is crucial.

Factors like the number of conductors bundled together and the installation method can also impact a wire’s ampacity and may require adjustments to the proper wire size selection.

Related reading: 80 Amp Wire Size: Breaker & Wiring Gauge Guide

Voltage vs Wire Ampacity

It is crucial to consider both voltage and ampacity to ensure safe and efficient electrical installations.

  • Voltage: Voltage, measured in volts (V), represents the electrical potential difference between two points in a circuit. It determines the force or pressure that drives electric current through a conductor.

Electronic devices and electrical appliances require specific voltage levels to operate correctly and safely. Typical voltage levels in residential settings include 120V and 240V in many countries.

  • Ampacity: Ampacity refers to the maximum current-carrying capacity of a cable or conductor. It is measured in amperes (A) and indicates how much current a wire can handle without overheating or causing an electrical safety hazard.

As the load on wires increases, temperature also increases. As the temperature rises, the capacity to carry more current decreases.

The ampacity of a wire depends on its size, material, and insulation type. Choosing a wire with sufficient ampacity to safely carry the expected current load without exceeding its wire rating capacity is important.

Voltage determines the electrical potential and compatibility of devices, while ampacity determines the maximum current-carrying capability of the wire.

Related Reading: 50 Amp Wire Size: Circuit Breaker & Wiring Gauge Guide

6 AWG vs 4 AWG Wire Size and Voltage Drop

4 AWG wire has a larger diameter than 6 AWG gauge wire. This means 4 AWG wire has lower resistance and less voltage drop than 6 AWG gauge wire.

The difference in wire size has implications for electric applications, particularly when considering voltage drop.

Voltage drop refers to the decrease in voltage that occurs as electrical current flows through a wire. It is influenced by distance in feet, wire gauge size, and the amount of current passing through the wire.

Larger wire sizes, such as 4 AWG, have lower resistance and, therefore, less voltage drop than smaller wire sizes like 6 AWG. All other factors being equal, using 4 AWG gauge wire will result in less voltage drop than 6 AWG gauge wire.

Voltage drop can have practical implications, especially over long cable runs or when dealing with high-current components. Excessive voltage drops can lead to reduced performance or even malfunctions in electrical equipment.

Copper vs Aluminum Wire

When selecting a wire size for a 60-amp electrical circuit, copper and aluminum are the most commonly used materials. Understanding these differences is essential in choosing the right cable for your project.

Pros of Copper Wiring
Copper has excellent electrical conductivity, making it an ideal choice for wire requiring a high electrical flow level.
Copper is more durable and resistant to corrosion, which can reduce the need for repairs and replacements over time.
Because of its high conductive properties, copper wire diameter is about half that of aluminum, allowing you to use a smaller conduit.
Copper has a higher melting point than aluminum, which can make it less susceptible to heat damage from overloading.
Cons of Copper Wiring
Copper wire is more expensive than aluminum wire, which can make a significant difference in large-scale projects.
Pros of Aluminum Wiring
Aluminum is cheaper than copper, making it a cost-effective option for larger jobs or longer runs.
Aluminum wires are easier to work with because they are lightweight and flexible.
Aluminum wires can be an excellent option for long-distance power transmission due to their lower resistance and high conductivity.
Cons of Aluminum Wiring
Aluminum is more prone to corrosion and can be more challenging to work with when compared to copper. It’s critical to use an anti-oxidant paste at connections.
Aluminum expands under high temperatures from an electrical load, which could lead to loose connections and an increased fire risk over time.

Will 60 Amps Run a House?

The electrical power required to run a house varies significantly depending on several factors, including the size of the house, the number of electrical appliances and devices used, and the specific power demands of those appliances.

While a 60 amp electrical service may be sufficient for some smaller houses with minimal power requirements, it is generally considered on the lower end of the capacity spectrum.

Many older houses had 60 amp breaker boxes because they had minimal electrical needs, such as powering a few lights and outlets. As larger appliances were introduced into homes, the electrical needs expanded.

Modern houses now require higher electrical capacities, typically 100 amps to 200 amps or more, to meet the demand for various electrical equipment like appliances, heating and cooling systems, lighting, and other electrical devices.

To add a new circuit meant that the existing panel would need an electrical upgrade or a new subpanel would need installation.

Related Reading: 200 Amp Service Upgrade Cost & Residential Guide 2023

Can You Add a 60-Amp Breaker to an Existing Panel? 

Breaker Panel Lg

Sizing your subpanel to fit your needs can be tricky. Consider what the power source offers and your required power load. 

If you already have a 200-amp panel, you’ll find no challenges incorporating a subpanel in a detached garage, barn, or shed. 

A 60 amp electrical panel or double-pole breakers can power your home’s general use outlets and lighting. However, if your existing electric panel is already rated at 60 amps and you wish to add a new 60 amp sub panel, upgrading the main panel becomes necessary to accommodate this addition.

Most modern homes use a minimum of 2/0 copper wire for 200 amp service. Depending on your electrical panel, you might be unable to add new breakers. You may need to install a 100-amp panel to house your new 60-amp circuit breaker. Therefore, you should consult a licensed electrician if you’re unsure about your panel size. 

If you want to add a sub-panel, it will help add a 12-slot circuit breaker panel, giving you room for other general electrical circuits. 

However, if you want to add several 240V appliances, including water heaters, central air conditioning, electric stoves, window air conditioners, or electric dryers, a 200-amp electrical service becomes imperative. 

Subpanels offer advantages such as reducing wire runs by centralizing the power distribution and minimizing voltage drops over long distances with smaller gauge wires. However, it’s essential to comply with the guidelines outlined in the National Electrical Code (NEC) regarding panels and subpanels.

Related reading: 70 Amp Wire Size: Breaker & Wiring Gauge Guide

60 Amp Wire Size FAQs

Let’s answer some frequently asked questions about the 60 amp wire size, length, wire gauge, and ambient temperature.

What size wire is needed for a 60 amp sub panel?

To wire a 60 amp sub panel, you would need to use a minimum of 6 AWG copper wire. A 4 AWG gauge copper cable is best, particularly for longer distances.

Can you run 60 amps on 10-gauge wire?

No, running 60 amps on 10 AWG wires is not recommended. 10 AWG wire is only rated for up to 30 amps. To safely run 60 amps, you should use 6-gauge electrical wiring.

How many amps can 6 AWG carry?

A 6 AWG copper wire can carry approximately 55 amps of current in typical applications, but consult the NEC or an electrician for precise calculations based on your specific installation.

Is 8 AWG good for 60 amps?

No, an 8 AWG copper wire is unsuitable for a constant 60 amp circuit load. A larger wire size, such as 6 AWG, is typically required. Consult the NEC or an electrician for accurate calculations.

What is the difference between 4 AWG and 6 AWG?

The main difference between 4 AWG and 6 AWG wires is their size and ampacity. 4 AWG wire is larger and can carry more current (approximately 85 amps) than 6 AWG wire (approximately 55 amps).

Is 60 amps enough for a garage?

A 60 amp electrical supply is often sufficient for typical garage applications, such as lighting, general outlets, and power tools. However, a higher amperage supply might be necessary if you run heavy-duty machinery, multiple high-power appliances, or an electric vehicle charging station in the garage.

Will a 60 Amp Subpanel Power an EV Charger?

A 60 Amp wire size and subpanel might not be sufficient to power an EV battery charger, depending on the power requirements of the charger. EV chargers range from 40 to 100 amps. It is essential to consult an electrician to assess your electrical system and determine if an upgrade is necessary.


Wiring 60-amp breakers are straightforward, especially if you have the required knowledge and skills. Always install a circuit breaker to prevent harming the connected appliances on the circuit. 

As we have seen, the appropriate size for 60-amp breakers is between 6 and 4 AWG (American Wire Gauge). However, the amp wire size might also depend on other factors. 

We have also highlighted some appliances requiring a 60-amp circuit breaker. Ensure that you take precautions while wiring circuit breakers. 

If you don’t know how to wire a 60-amp breaker, contact a professional electrician to do it for you.

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Hubert Miles | Licensed Home Inspector, CMI, CPI

Hubert Miles is a licensed home inspector (RBI# 2556) with more than two decades of experience in inspection and construction. Since 2008, he has been serving South Carolina through his company, Patriot Home Inspections LLC. As a Certified Master Inspector, Hubert is dedicated to providing his expertise in home inspections, repairs, maintenance, and DIY projects.