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It's the same as a fuse box. Sort of. The electric service panel used to be called the fuse box, fuse panel,  circuit breaker panel, or any number of other terms. Today, most homes have what we call the electrical service panel, or simply, the service panel. It's not literally the same thing, but it does provide the same function.
wikiHow to Remove a Knock Out from an Electrical Box. A knock out or KO is a partially stamped opening in electrical enclosures that allows quick entry of a wire, cable or pipe via connector or fitting to the interior. With the right information and technique, you should be able to remove a KO from electrical panels and other electrical enclosures without any problems. Steps.