Electrical receptacles have two pairs of terminals so that you can daisy-chain multiple receptacles on a single circuit in an existing house. Installing too many receptacles on a circuit presents the probability of overloading the breaker, however, so a prudent approach is to distribute the receptacles among two or more circuits, particularly when adding multiple outlets in a single room. That way, if one of the breakers blows, you'll still have a live outlet to use. Standard electric code allows you to wire amp receptacles with gauge wire, but it's safer to use gauge, which is thicker.
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The following project shows how to connect the receptacle when the electrical box has already been installed and when the necessary NM electrical cables have been run in the wall cavities. Carefully read the following instructions to determine if your skills and understanding are sufficient to do the job. However, replacing an old receptacle with a new one, or installing receptacles when the circuit wiring and electrical boxes are already in place, as described here, is a job that just about any homeowner can safely do. Household outlet receptacles can be wired in one of two ways, depending on where the outlet falls along the circuit.
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