On A 3-way, there’s an extra terminal, called the “widespread.” Power comes in for the switch over the frequent, then two “traveler” wires hook up the 1st switch to the 2nd around the brass terminals. They're only schematic diagrams to explain about different sorts of arrangements that you just could https://daltonxgltv.bcbloggers.com/33916697/smart-power-points-and-switches-no-further-a-mystery