How to Wire a 220 Volt 3 Wire Dryer Outlet | Hunker One of the updates in the 1996 National Electric Code was to require grounding on 220-volt circuits, such as dryer outlet wiring. After this update, all dryer receptacles are required to have four wires instead of three. The code requirement doesn't apply to houses built before 1996, though.Author: Chris Deziel How Do I Wire a 220-Volt Dryer Outlet? | Reference Wiring a 220 volt electrical outlet for a dryer is a simple task if you have existing 220 volt supply wires in the wall coming from the breaker box. You need a 220 volt outlet with matching pin configuration to that of your dryer's plug, a screwdriver, a wire cutter or stripper and some wall screws.