On A 3-way, there’s an extra terminal, called the “typical.” Power is available in into the switch on the widespread, then two “traveler” wires join the first switch to the 2nd around the brass terminals. Before you purchase smart devices, Look at to check out Should you have a neutral https://smartswitchesaustralia69244.wizzardsblog.com/34717918/the-definitive-guide-to-smart-switches