What wire size is required for a 240V dryer circuit?

[FatimaandAhmed]

Hi everyone,

What gauge wire is required for installing a 240V electric dryer outlet in a residential home?

Thanks in advance for any help!

[machinist]

Hi! For a 240V electric dryer outlet in a typical residential home, the common wire size is 10-gauge copper wire. This wire is usually paired with a 30-amp double-pole circuit breaker. It is important to check the dryer's installation instructions or manufacturer specifications, as some models may require different amperage or wire sizes. Additionally, local electrical codes might have specific requirements, so consulting with the local building department or a licensed electrician before installation is recommended.

[FatimaandAhmed]

Is aluminum wire ever used for dryer outlets, or is copper generally the standard choice?

[machinist]

Copper is generally the standard and preferred choice for dryer outlets because it’s more reliable and easier to work with. Aluminum wire can technically be used in certain situations, but it’s not common for this type of installation. Aluminum requires larger gauge sizes for the same amperage, and the connections need special care (like anti-oxidant paste and compatible devices) to avoid problems over time. For most residential dryer circuits, 10-gauge copper on a 30-amp breaker is the go-to.

[FatimaandAhmed]

Thanks! Would the required wire size change if the dryer outlet is a long distance from the panel?

[machinist]

Yes, the wire size can change if the outlet is a long distance from the panel. Voltage drop becomes more of a concern on longer runs. The National Electrical Code doesn’t set a strict limit, but it does recommend keeping voltage drop to about 3% or less on branch circuits and around 5% total when including feeders. For most typical dryer installations within 50 feet or so, 10-gauge copper is fine on a 30-amp breaker. If the run is much longer, upsizing to 8-gauge copper isn’t a code requirement, but it is considered good practice to stay within the recommended limits and ensure proper performance. If not sure, it’s always better to consult a licensed electrician.