Wiring diagrams for 220-volt appliances, such as washers, dryers or ovens, can be found in the manufacturer's appliance service manuals, which are typically available on the manufacturer's website. Some wiring diagrams are mounted directly on the appliance, typically behind control or access panels.
As of 2014, wiring diagrams for 220-volt appliances may also be found on various do-it-yourself and electricity-related websites and in books, such as "Black & Decker: The Complete Guide to Wiring, Updated 6th Edition" by Cool Springs Press. Before beginning any electrical project, inspections and permits must be obtained through local government offices. All wiring projects are required to meet local, state and national electrical codes.