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Dishwashers

Does a dishwasher have to be on a dedicated circuit?


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2012-08-17 23:32:47
2012-08-17 23:32:47

Dishwashers do not have to be on a dedicated circuit, according to NEC codes. Neither do refrigerators. Electric Ranges and OTR Microwave Hoods and Hood Fans do.

First, always ascertain the appliances that will be in the room and regularly used, and calculate their wattage or look it up in the specs found on the appliance or in its manual.

The dishwasher issue is a falsehood espoused by many kitchen designers, home inspectors and electricians who have apparently substituted their own opinions as being code. I just read all of the applicable NEC codes. They are readily available for purchase or for free at your local library. Consulting it yourself is the best bet. It does not specify a dedicated circuit for the dishwasher. It can be on a branch circuit for the kitchen, but if it's sharing the circuit with other appliances, then it must not use more than 50% of a branch circuit's load capacity. So that in effect creates a dedicated circuit requirement IF your circuit is a 15 amp circuit. If it's a 20 amp, you may have capacity room for a small load appliance such as the disposal or refrigerator, depending on load calculations (Volts x Amps = Watts (Load). But if you use a 30 amp or higher circuit capacity, then you can comply with code much easier if other small appliances are on it. NEC 210.23

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A 15 amp dedicated circuit breaker should be used for the dishwasher. The disposal can be wired to the general kitchen 15 amp circuit.

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You should really try to have one dedicated to your refrigerator and one dedicated to your stove/oven (if electric). I believe you will not have any issues if the dishwasher and disposal are on the same circuit.

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No, the dishwasher uses the dedicated breaker in the distribution panel, that feeds the device to protect the circuit, should a fault occur.

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A "dedicated" circuit is one to which only one device is or can be connected; therefore the circuit is "dedicated" to the device. A NON dedicated circuit will therefore be one to which multiple devices can connect, such as the wall outlets in your home. Multiple wall outlets are connected to a common circuit breaker, making that an example of a non-dedicated circuit.

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A dedicated circuit is defined as a circuit having only one defined device as the load.


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