I don't recall I've ever seen it used in this area.
They're not installed any more because they break so many NEC articles.
Today, you would need 4 conductors (plus ground) to accomplish this legally. "Back in the day", someone figured out how to do it with just 3.
Thats a Chicago 3 way I believe with a little ginger bread added.The California 3 way is legal I'm thinking as it doesn't switch the neutral.
I see how that works, and would comply with NEC, but what is the advantage to that?
Appears to me it requires one more conductor between switches than what most of us would run for it to work.
Correction on the Carter,,,the Carter 3 way is another name for the Chicago 3 way.
I'm not a proponent of the California 3 way, just wondered if it was used much.One advantage may be you can have switched outlets or direct wired outlets at either end giving you a bit of cost savings on wire but man how'd you like to have to trouble shoot that mess.
You don't have a constant hot at the far end with the conventional method as I see it,do you?
The flow of devices in schematic being from left to right.......... bkr,sw, sw & light.
In the UK, we call it "American switching"
Just out of curiosity,,,,,,,,is the so called California or Coast 3 way alternate scheme used much?
The problem with the so-called California threeway shown in this diagram occurs when one uses the lower traveler (the always hot traveler) to supply downstream load.It took me a while to find one,,this is the California 3 way,,they said it is aka the Carter 3 way