All appliances have a motor of their own and require a lot more energy compared to lighting and gadgets. You need to have dedicated or one-is-to-one circuit per appliance for safety reasons. It reduces the possibility of overloading a circuit while having 2 or more appliances in one circuit can cause it to trip. Although it can be avoided by not using appliances at the same time, sometimes it can be overlooked. Particularly in the kitchen, chances are you will be using the microwave and the cooking range at the same time.
Frequent tripping will eventually wear down your circuit and could start a fire. Apart from that, it is part of the requirement of the National Electrical Code. Another advantage of having dedicated circuits installed is that it protects the life of your appliances.
Here are some of the appliances that require a dedicated circuit:
Appliances like microwaves, refrigerators, hair dryers, washing machines and the air conditioner would require a circuit that can handle 15 to 20 amperes of power. Meanwhile, water heaters, ranges, furnaces, and heat pumps would need at least 30 amperes or higher. Consult with an electrical professional to know your load requirements.
Dedicated circuits are installed by wiring a connection from the circuit to the outlet of the appliance, and there will only be one outlet dedicated to that appliance. Make sure that only a licensed professional or electrical company does the installation. Using insufficient wire size and low amperage circuits will also result in tripping and probably fire.
If you are already experiencing tripping over your circuits, you may have multiple appliances in one circuit. Call a professional to inspect and repair your circuits.