Each hot wire's copper tip ultimately connects to its control switch at the circuit breaker, and each neutral connects to a common terminal called a bus bar. This is the on/off switch to the ...

Each wire powers one “bus” (copper vertical ... clamped to the common neutral bar. The way you get a 240-volt circuit is simple. A “double-pole” circuit breaker is clipped into both ...

This large circuit breaker, called the main breaker switch ... Circuits for 120-volt circuits connect to one bus bar; circuits for 240-volt circuits connect to both hot bus bars.