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what is an intermediate switch used for?

what is an intermediate lightswitch used for
mick, March 2010
When you wish to operate a light from three or more stations...

A regular switch with Com, L1, L2 at each end and as many intermediate switches in between as you need.

An intermediate switch is a polarity reversal (changeover) switch with Four Terminals...

Diagrams here...

http://en.wikipedia.org/wiki/Multiway_switching

Peccavi, March 2010