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Can you run an extra set of wires off a 20 amp breaker?

Updated: 8/20/2019
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10y ago

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No, this is stated very clearly in the electrical code. Only one branch circuit is to be allowed connected to each individual circuit breaker no matter what the amperage is. If a new branch circuit is installed and there are no spare breakers then most distribution panels have the ability to let tandem breaker be installed in it. Tandem breakers have two terminals and two handles and have the ability to fit into a single slot in the distribution panel.

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Q: Can you run an extra set of wires off a 20 amp breaker?
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Not if it's functioning properly. The purpose of a circuit breaker is to shut off power if the circuit exceeds the rated power capacity of the wires. Don't plan to exceed the 30 Amp capacity of your house wiring; the results will be destructive.


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Can a 15 amp breaker be replced by a 20 amp?

Sure, but you may start a fire or damage the circuit. Kind of like saying: Can you shoot your self in the head? Sure...but I would not recommend it. Here is the deal. A fuse or circuit breaker is made to trip or burn out when a specific load is met. The engineers came up with the amperage based on a few things. But mostly to keep things cool. If something is drawing too much power (amps) then the wires will get hot. So changing a 15amp breaker with a 20 amp may allow the wires to get too hot and over heat the wires. Hot wires may melt off insulation and cause a fire. The wires may not be heavy enough to handle the load. THT


Is it ok to exchange a 20 amp breaker with a 40 amp breaker?

No. The 20 amp breaker is probably protecting a #12 wire. Connecting a 40 amp breaker to the 20 amp #12 wire would seriously overload the #12 wire. This means that if the load increased to a full 40 amps the insulation on the smaller size wire would most likely melt off and the wire could short out.


What can you run off a 50 Amp breaker?

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Can you run a 1000 watts light bulb with a 20 amp breaker 120v?

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How do you wire a 15 amp breaker?

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