Installing 220 Volt Outlets. Posted: October 9, 2024 | Last updated: October 9, 2024. Learn how to add 220-volt outlets to your garage for more power options. More for You.

Some 220/240 outlets are 4-wire: 2 x 110/120v prongs (black, red), 1 neutral, 1 ground. The appliance that plugs in to it combines the two 110/120v currents internally to get the 220/240v.