The primary purpose of a circuit breaker is to protect the circuit's wiring. So the wiring must have ampacity equal to or greater than the value of the circuit breaker.
However, it's understood that in most cases the total load on the circuit will be greater than its greatest single load. So if you put 15 amp outlets on a 20 amp circuit, it's still possible to overload the circuit and trip the breaker.
Personally, I always put 20 amp outlets on 20 amp circuits; that way I know which outlets are on 20 amp circuits even though I don't have any appliances with 20 amp plugs.
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Today's Featured Article - Piston Ring Removal and Replacement - by Chris Pratt. Piston Ring Removal and Replacement - Replacing rings is a fairly easy process to stretch the engines usability between major rebuilds and cut down on that blue smoke and high oil consumption. Frequently, replacing only the rings is not advisable because by the time you do the teardown and measurement of the components, the pistons are often beyond the manufacturers specification or something else you find will signify the need for a major rebu
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