On A 3-way, there’s an additional terminal, known as the “prevalent.” Power is available in to the switch over the widespread, then two “traveler” wires join the primary switch to the 2nd to the brass terminals. DIYers mustn't, nonetheless, consider operating new wiring by themselves—that’s a position for an electrician. https://smartlightswitchwhiteclea24109.jiliblog.com/91458063/5-essential-elements-for-wiring-systems