Can a 240 volt kiln be plugged into a 220 volt outlet? I live in Arizona.

Many countries, including Mexico, have 220 volts instead of 240. The United States and Canada, though, have 240 volts but not 220. You may get a 220 volt reading on a circuit in the U.S. or Canada, but the circuit is actually 240 volts. Some domestic appliances are rated at 220 volts, which means they can operate on either 208 or 240 volts. Plugging a 240-volt kiln into a circuit that reads only 220 volts will usually result in slow firings. Since your kiln was designed for 240 volts, it will not have full amperage on 220 volts. This doesn't necessarily matter, however. We know of a 240-volt glass kiln that operated adequately on 208 volts. It fired slower than intended, but that was okay with the customer.