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How many outlets can you put on a wire with a 15A breaker if it already has an outdoor security light fitted to it through a switch?

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2015-07-16 19:26:10
2015-07-16 19:26:10

Most (if not all) city codes require outlets be wired with 12 gauge wire and a 20 amp breaker. Lights can be wired with 14 gauge and 15 amps.

One, or possibly a million. The question you need to ask youself is how do you intend to load this 15A circuit. It already has a light on it. Is that all? How much power does this use? What is the usage of these new outlets? How much power do you plan to draw off them?

Remeber power is the product of voltage and current. So your 15A 120V breaker can supply 1800W. Sum up everything you want to put on this circuit. If you plan on drawing more than 1000W regularly on this circuit you should consider using two or more circuits. Keep in mind you want a margin of error (I went with 800W) for large temporary loads such as vacuum cleaners and irons. Don't underrate your circuit, you will regret it later.

Another poster said in another thread that according to code "generally each duplex outlet may count for 180W" (Smseagle). So, to use this rule, you need to take 1800W, subtract the wattage of your security light, and divide the result by the remainder. The quotient, rounded down, is your answer.

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If you never plug anything into them, there is no limit. If the total current drawn from all outlets exceeds 20 amps, the breaker will trip.


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