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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.
The electrical code limits how many wires you can safely put in an electrical box. Multiply the total by 2 for 14-gauge wire and 2.25 for 12-gauge wire to get the minimum box size required in cubic inches. Plastic boxes have their volume stamped inside. Steel box capacities are listed in the electrical code.