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When converting a standard 120-volt outlet to a 240-volt outlet, the only components you can typically reuse are the existing electrical box and the hole in the wall. Everything else—including the wiring, breaker, and receptacle—should be replaced to ensure both safety and efficiency. Appliances designed for 240 volts have different plug configurations that won’t fit into a standard 120-volt outlet, making it necessary to install a compatible 240-volt receptacle. This design helps prevent overloading or underloading the power available to any one outlet or circuit.

You should never plug a normal 120v appliance into a special 240v outlet, as it can quickly burn out the appliance. This will cause irreparable damage to the appliance and, in worse case scenarios, cause damage to your circuit breaker. Check your appliance’s rating before plugging it into a 220v outlet to avoid electrical disaster.

If it’s called a USB outlet without any further designation, it likely refers to a USB-A port. These are the original USB connections and are commonly integrated within power outlets. In recent years, USB-A cables have slowly been usurped by faster and more reliable USB-C cables. USB-C connectors are small and ultra-thin with a reversible design, while USB-A connectors are slightly larger and bulkier.

The cost to replace or install an electrical outlet can vary. On average, you can expect to pay between $125 and $215 per outlet, including labor and materials. For a standard 120v outlet, the material cost is typically between $10 and $50. Labor costs for an electrician usually range from $50 to $100 per hour. The total cost can be higher if there are complex electrical issues to resolve. Specialized outlets like GFCI or high-voltage types can cost up to $50 each for the material alone. If you are replacing many outlets throughout your home, the total project cost could be between $900 and $3,000, but you may receive a better per-outlet rate from the electrician.