CNBINGO Single Dimmer Switch for LED Lights, Gold Touch Light Switch, No Neutral Wire Required, Tempered Glass Panel with LED Backlight, 1-Gang 1-Way, AC 240V 700W
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A typical example of this is on a landing. There is a switch at the bottom of the stairs, one at top of the stairs and one at the end of the landing. On this circuit you would need the middle switch to be intermediate (i.E. The one at the top of the stairs) in order for all the switches to function properly.