On 9/14/19 1:49 PM, Ralph Mowery wrote:

[snip]

There is also a '4 way switch' . That is for more than 2 places to turn
on/off a light (or anything else). You usually put a 3 way switch at
each end of the circuit and as many 4 way switches in the middle as you
need.

It is essentially a DPDT (double pole, double throw) switch with 2 pairs
of terminals connected internally, so switching exchanges 2 connections.

[SPAM snipped]


--
101 days until the winter celebration (Wed, Dec 25, 2019 12:00:00 AM for
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Mark Lloyd
http://notstupid.us/

"One man's theology is another man's belly laugh." [Robert Heinlein,
"Notebooks of Lazarus Long"]