A 48-amp EV charger requires a 60-amp circuit, because EV charging is a continuous load sized at 125 percent of the charger’s draw, and that circuit generally uses 6 AWG copper wire, though the exact size depends on the wire type and insulation rating, the run length, temperature, and other code factors. Because wire sizing must be correct for safety, it is determined by a licensed electrician per the applicable code. Understanding the general answer helps, while the precise sizing is a professional’s job.
Here is what gauge wire a 48-amp EV charger needs.
Wire sizing depends on the wire type, insulation temperature rating, length, temperature, derating, and code, so always confirm the correct size with a licensed electrician and the applicable code.
A 48-amp charger needs a 60-amp circuit
First, a 48-amp EV charger requires a 60-amp circuit. This is because EV charging is a continuous load, which code requires to be sized at 125 percent, and 48 amps times 1.25 is 60 amps. So the circuit and its breaker are 60 amps for a 48-amp charger. The wire must then be sized to safely carry that 60-amp circuit. This continuous-load rule is why the circuit is larger than the charger’s 48-amp draw.
Generally 6 AWG copper
For a 60-amp circuit, the wire is generally 6 AWG copper, which is the common size used for 60-amp circuits in typical conditions. So a 48-amp EV charger generally uses 6 AWG copper wire for its 60-amp circuit. This is the typical answer you will see, and it holds for common installations. However, it is a general answer, and the exact size depends on several factors that an electrician accounts for.
What can change the exact size
The precise wire size depends on more than the amperage:
- The wire type and insulation temperature rating, which affect its ampacity
- The run length, since long runs may need larger wire to limit voltage drop
- Temperature and derating, such as heat in an attic or multiple conductors bundled
- Copper vs aluminum, since aluminum requires a larger size than copper for the same current
- The specific code requirements
Because of these, the general 6 AWG copper answer can change in specific situations, for example a larger size for a long run or hot environment, or a different size for aluminum. This is why the sizing is confirmed by an electrician.
Why correct sizing matters
Correct wire sizing matters because undersized wire for the circuit can overheat, which is a fire hazard, while the wire and breaker must be properly matched. Sizing the wire correctly for the 60-amp circuit, accounting for the conditions, ensures it can safely carry the current. This is why wire sizing is not a casual choice but a code-governed calculation, and getting it right is essential for a safe 48-amp charger installation.
Confirmed by a licensed electrician
Because the exact wire gauge depends on the wire type, length, temperature, derating, and code, it is confirmed and installed by a licensed electrician. They size the wire correctly for your specific 48-amp charger installation, accounting for the run and conditions, so it safely carries the 60-amp circuit and meets code. While 6 AWG copper is the general answer, the electrician ensures the right size for your situation.
A 48-amp EV charger requires a 60-amp circuit (because EV charging is a continuous load sized at 125 percent), and that circuit generally uses 6 AWG copper wire. However, the exact size depends on the wire type and insulation rating, the run length, temperature, derating, and whether copper or aluminum, so it is confirmed by a licensed electrician per code. Correct sizing is essential for safety, so the precise gauge is a professional’s determination.
Stella Electric installs 48-amp and other EV chargers with correctly sized wiring for homeowners across the Baltimore area and throughout Maryland, with flat-rate pricing and no overtime charges. If you are installing a 48-amp charger, we size it right. Financing is available on qualifying projects.
