When you want to control lights from two different places (e.g. the top and bottom of a stairwell) you have two different ways of doing it (pic A and B). Some guy told me that B was the American way. Is that right?
[This message has been edited by Webmaster (edited 08-20-2001).]
it would be a version of fig#7 in the above link. refered to as a 'french 3-way' . I have heard it refered to as a 'Chicago 3-way'
actually Kent, the guy who told you it was an American version is right, but it has not been in use for a long time. It would be hard, in fact, to find a field electrician that actually has installed K&T as a beginner, most are probably retired.
It's comical how these boo-boo's gain names of localities....
[This message has been edited by sparky (edited 08-20-2001).]
Re: A question#3498 08/20/0107:39 PM08/20/0107:39 PM
Both methods are in use in the U.K., depending mainly upon the physical wirng layout.
(A) is the "traditional" method, used almost universally in the past where junction boxes were used to wire up lighting circuits.
(B) is common now, as many houses have lights wired on the "loop-in" principle to avoid the jct-boxes (i.e. permanently live power is taken to the light fitting and a separate cable runs from there to the switch).
With this method an extra jct-box is avoided, as a 3-way (plus gnd) cable then just runs from one switch to the other. Less work in the roof space, but more cable.
It's also known as the "conversion" method here, as it's an easy way to change a normal single switch to 2/3-way operation.