Hi, Roy.

RM>  RM>  BV> I had a close look at where the light switches were
as you moved
RM>  RM>  BV> through the house, and made some of them 3-way and one 4-way
RM>  FM> instead
RM>  RM>  BV> of just 2-way.

RM>  RM> Hmm. It's easy to use a simple spdt switch to do an even number (2
RM>  RM> way, 4 way, 6 way), but to do odd numbers needs 2 pole switches.
RM>  RM> I'm out of touch here - are 2 poles readily available?

RM>  FM> Now that can't be right. Assume that you could do 4-way with spdt
RM>  FM> switches, and you want 3-way. Just wire up 4-way and hide the 4th
RM>  FM> switch. Then think, shit, that 4th switch isn't doing anything - I'll
RM>  FM> just hard-wire it.

RM> Good logical point, with only one flaw - my original logic! I've
RM> just redone the circuit on paper, instead of in my tiny mind. A
RM> dual switch can be done with two SPDTs, any more can be done with
RM> an SPDT at each end, and any number of DPDTs in between. Two wires
RM> run the full length of the chain of switches. The SPSTs switch the
RM> single incoming to one or the other wire, the DPDTs just swap the
RM> two wires over.

Yes, I thought that's how you'd do it.

Regards, fIM.

 * * Tagline thievery... coming up on the next Geraldo!
@EOT:

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