Most places you live in today will manage their electrical power via circuit breakers, though fuse boxes predated that ...

Lastly, some diagrams will also have a circled number shown next to a line on the diagram. These circled numbers are used to identify the actual wires used on the system. For example, in our drawing ...

For Circuit Breaker I found influence in electrical diagrams and symbols: Tron (the 1982 original version, of course); the conceptual artwork of Syd Mead, who was instrumental in creating the look ...