When you consider electrical wiring for laundry rooms, you'll need to know the difference between designated and dedicated circuits. According to the National Electrical Code, many critical appliances like freezers, refrigerators, and garbage disposers require a circuit all their own, a dedicated circuit. Because it is used by only one appliance in most cases, you don't have to worry about the circuit becoming overloaded by sharing with another appliance or device.
This, however, is not true with the laundry circuit where the circuit receptacle is used for both the washer and dryer power connection when the dryer is a gas dryer. However, the dryer power is limited to drum motor, buzzers, and timer feeds. That's why we will describe the circuitry feed as the laundry circuit, one thing, rather two appliances, a washer and dryer. That's why we need a different type of circuit designation, a designated circuit. Even though it is only used for one specific location, laundry, it may be being used by more than one appliance, a washer, and a dryer.
If the laundry consists of an electric dryer, the washer is the only thing plugged into the designated 120-volt, 20-amp receptacle and the electric dryer is connected to a 240-volt, 30-amp receptacle, a dedicated circuit.