What does over-fused mean?
Friday, March 26, 2021
Over-fused means that the amperage rating of a fuse or breaker exceeds the amperage rating of the wiring in the circuit. The main purpose of a an overcurrent device is to prevent overheating when too much current is flowing through the wiring; so, when properly sized, it trips to disconnect the circuit before the hot wires start a fire.
In ordinary residential installations, there are standard matches between copper wire size and breaker rating, such as 15-amp breaker and #14 wire, 20-amp and #12, 30-amp and #10, and so forth. Larger wires can carry more current. But special situations may require derating the wiring (upping to a larger size), and an electrician will know when these kick in.
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