16 years ago
There is an old puzzle that asks how to wire three three-way
switches in such a way that each of them can switch on or
off a lamp. I read abou it at least 30 years ago.
This is NOT the puzzle about the three switches that you find
everywhere. In fact, the wiring is not trivial - it is not an easy
puzzle. I saw the solution once, but cannot find it
The puzzle is to find a 3 x "3-way switch" solution; the easy
2 x "3-way" plus 1 x "four-way" switch wiring
is not what I am looking for. (And no electrical regulations
should be followed; if I remember correctly, both ends of
the lamp are switched.)
Is anybody able to do this?