Each of these appliances will run fine on the same 20-amp circuit if they are run one at a time. But if you tried to run two at a time or all three at once, you could overload the circuit capacity and trip off the circuit breaker.
Microwave ovens often demand dedicated circuitry, but this isn't always a necessity. The National Electrical Code requires it for all fixed equipment, so a circuit must be set aside for any built-in oven. Small or older countertop models draw less power than modern full-size units.
According to the electrical code, the dishwasher should be on its own circuit. The dedicated dishwasher circuit can't supply any other appliances, lights, fixtures, or outlets. In addition, the circuit that is servicing the dishwasher also needs to have a circuit breaker with at least 15-amps.
A dishwasher and a refrigerator can be on the same circuit. Although, it may cause your circuit breaker nuisance tripping. Appliances that require the same amount of current for their operation might be on the same circuit.
A kitchen requires minimum of two 20-amp small appliance circuits, and they must be GFCI-protected. Dishwasher circuit must now be GFCI-protected, with cord/plug to a receptacle. If the receptacle contains the GFCI-device, it must be accessible (not behind the dishwasher).
According to the 2020 version of the NEC, you can't power a microwave and refrigerator on the same circuit because each of these appliances requires a dedicated circuit, which is one shared by no other appliances or lights.
Since 15A outlets have been the standard for so long, almost all small home appliances are designed to work with a 15A outlet. Some high-end dishwashers do require a 20A circuit, but most mainstream units are still 15A.
The microwave oven needs a dedicated 20-amp, the 120/125-volt circuit to feed it. This will require 12/2 NM wire with a ground. Microwave ovens come in different varieties and sizes. Some are countertop models, and other microwaves mount above the stove.
Microwaves are known to draw as much as 1500 watts, and for that matter plugging them into a standard appliance outlet will pose a safety hazard. Microwave isn't the only appliance that requires a dedicated outlet, but any other heavy-duty appliance that uses that much power.
A GFI or GFCI outlet is needed if the microwave is located less than 6 feet from a water source such as the edge of the sink, toilet, shower, etc. It is also needed if located outdoors, garages, kitchen counter tops, near laundry, utility sinks, wet bar sinks and near swimming pools.
A microwave plugged into a 15-amp circuit could cause the wires in the wall to overheat and present a fire hazard. More likely, however, the microwave will trip the 15-amp breaker and pose a regular nuissance. Note that you should never just replace a 15-amp breaker with a 20-amp breaker.
Standard small microwave appliances will need a 10 amp circuit but can range from 15-20 amps.
No, a 1000 watt microwave does not require a dedicated circuit. A simple 15 amp receptacle can provide enough power to run an 1800 watt appliance and there are additional options that can handle up to 2400 watts at once. This demonstrates that a simple 1000 watt microwave doesn't require a separate circuit at home.
Answer: Yes. Any device that draws a large amount of power from the wall needs a dedicated outlet. Putting a refrigerator on a shared circuit makes the circuit prone to circuit breaker trips.
Yes, most household microwaves area about 1000–1500 watts, fully capable of using a normal household outlet.
Yes, the dishwasher and garbage disposal can run on the same circuit. But they are more preferred to be powered by two different circuits rather than one.
Assuming you have a 20 amp circuit, putting them both on the same circuit would not be code compliant. As well, your circuit would be overloaded. For the purposes being discussed here, both are fixed-in-place appliances.
The National Electrical Code requires dedicated circuits for major electrical appliances such as refrigerators, stoves, washers, dryers, and electric water heaters because they ensure that appliances can operate safely without overloading the home's electrical system.
Kitchen dishwashers installed in dwelling units require GFCI protection whether hard wired or cord and plug connected. Code Change Summary: A new subsection was added regarding dwelling unit kitchen dishwashers. Now, outlets that supply dwelling unit kitchen dishwashers must have GFCI protection.
Wiring Dishwasher GFCI NEC Code
Changes have been made to the NEC to include dishwashers in the list of appliances that require GFCI protection. Therefore, if you have a dishwasher, unless your local code says otherwise, you should pair it with GFCI protection.
Dishwashers are hardwired. They consume a relatively high amount of power, so it is not advised to use the same method to connect your other household appliances.
We strongly recommend that an extension cord not be used with a microwave due to potential safety hazards under certain conditions. Your microwave should be plugged into its own properly grounded, dedicated electrical outlet to prevent the flickering of the lights, blowing of a fuse or tripping of a circuit breaker.
700-watt microwave:
Generally, a 700-watt microwave doesn't need a dedicated circuit line if the circuit line doesn't have too much load. For example, if you use a small-size microwave with a small fridge, you can use both on a 700-watt microwave.
Rule two: never plug high power capacity appliances, like space heaters, refrigerators, or microwave and toaster ovens into power strips or extension cords. These appliances have higher power capacity and need to be plugged into a wall outlet directly.
The microwaves require a 120 volt, individual, properly grounded branch circuit with a 3 prong grounding type receptacle protected by a 15 or 20 amp circuit breaker or time-delay fuse. Over-the-Range microwave models should always be on a dedicated circuit.