On A 3-way, there’s an additional terminal, known as the “frequent.” Power is available in to the switch to the common, then two “traveler” wires join the first switch to the next over the brass terminals. One example is, the BS 1363 plug is Employed in the uk, even though https://angelodypgv.ampblogs.com/details-fiction-and-smart-light-switches-71456776