On A 3-way, there’s an extra terminal, known as the “frequent.” Power comes in towards the switch to the common, then two “traveler” wires connect the 1st switch to the second about the brass terminals. Situations improve, also. “The physical process of changing the products hasn't adjusted, however the NEC https://p-hub-system44764.is-blog.com/41311387/wiring-to-lights-fundamentals-explained