Most electrical panels have 200-, 300-, or 400-amp capacities and enough room for up to 84 circuits. A sub-panel is a smaller circuit panel breaker fed from a 240-volt circuit breaker in the main ...

A properly installed fuse is just as safe as a circuit breaker, but there are ... up to nine spaces in an electric panel. The example I gave for an old 60 amp panel only has six spaces available ...