Microwaves and refrigerators are heavy-duty appliances that use large amounts of energy and therefore need to be powered by a dedicated circuit. A dedicated circuit is designed for use by only one appliance.
Appliances such as microwaves and refrigerators need circuit wiring that can carry a large enough current. The wire and circuit breaker size depend on whether the appliance requires 120 or 240 volts of power.
Microwaves and refrigerators should each have a properly grounded circuit with a 15/20 amp circuit breaker or fuse and a #14 gauge house wire at minimum.
It is always recommended that microwaves and refrigerators have their own dedicated circuits. Depending on the area, local housing codes may mandate specific wiring requirements.
A professional electrician can help determine the best wiring setup for your kitchen appliances.
If a microwave and refrigerator share a circuit, frequent tripping of the circuit breaker may be experienced or, worse, melting of the electrical wire and a potential fire.