Having just seen a list of the voltages used in some 150 countries worldwide, it seems we're down to either 110/120 VAC @60Hz or 220/240VAC @50Hz. Has the 150VAC @ 60Hz standard completely disappeared? The reason I ask, is that that was the standard in Colombia (South America) when I lived there in the early 70's. Be interesting to learn why that became the standard when, even then, most countries used 110/120VAC or 220/240VAC.

I'm planning on moving 3 switches (or add 3-way switches). They are all currently in the same box and I wanted to make sure I understand the circuits. In the picture, you can see the 3 cables coming in and out of the box. The top right cable is connected via a red wire to the bedroom ceiling light switch (rightmost switch, half visible). The top left cable, via 2 red wires goes to the two other switches (pulled off) that operate a living room light, and outlet. All 3 switches are connected to each other and to the black wire from the top left cable. Furthermore there is a pair of white and yellow (mostly painted white) wires that simply pass through from the top right cable to the bottom cable. My best guess is that these two wires go to the outlet that is below the switch box (yellow because AFCI?). After thinking about this, I think that the black is the live supply, and reds go to each device. What confused me was that there are no neutral, but that's normal when the supply goes to the light first, right? I'm sure I'll have more questions soon as this is my first home project, but let's start with the basics. :) Thanks for the help! [ATTACH]80514[/ATTACH]