A:AnswerHello. Thanks for reaching out about this oven. You must use a single-phase, 120/208 VAC or 120/240 VAC, 60 Hertz electrical system. If you connect to aluminum wiring, properly installed connectors approved for use with aluminum wiring must be used. We recommend you have the electrical wiring and hookup of your appliance connected by a qualified electrician. If you have any additional questions or concerns, let us know. We are here to help. -Kianna@Café