@trinsec had that experience once also
@barefootstache I only forgot to turn off one light when I left for work. But that's alright, heh. Hard to check whether your lights are still on or off during a power outage. :D
@trinsec unless you know how the position of the switches should be
@barefootstache Of this particular one it's impossible. It's a 'hotelschakeling'. Means there are 2 switches for one light. Those switches could be in either position.
@trinsec well yes, though only a certain amount of permutation will make the light be on or off
@trinsec If we have two lights A and B, and they both only have two states 1 and 0, then there are a total of four permutations:
00
01
10
11
From these four permutation only two of them will make the light be off and the other two make it be on. (unless the electrician did some mean non-standard design)
Typically one would group the permutation like this:
00, 11 (j)
01, 10 (k)
Thus one would only have to know what state the light would have if (j) is true.
@barefootstache @trinsec Wait a minute. When you guys have multiple switches for 1 light, it should be the case that so long as exactly 1 switch is on, the light is on, right? That's how it's always been at the various places I've lived. i.e. A xor B -> light
@barefootstache @trinsec flip one of your switches and you can make it XOR ;)
@johnabs @barefootstache Somehow me trying to upload a GIF animation doesn't seem to animate well.. fine, here's a direct link:
https://media.natuurkunde.nl/content_files/files/9463/original/wisselschakeling.gif
@trinsec @barefootstache what if they're both toggled to the top wire? Does the bulb turn on?
@johnabs @barefootstache Yup.
@trinsec @barefootstache so...its just if they're in the same position as each other, right?
@johnabs @barefootstache Apparently so. Never really thought about it. Since they're both upstairs and downstairs paired with other switches (normal switches). And to go upstairs or downstairs to check is annoying. :D
@trinsec @barefootstache Fair enough! I was just thinking "is this some European electrical engineering thing I'm too American to understand"?
@johnabs @barefootstache Heh, naw, doubt it. I'm sure this idea's universal for a 2-switch system.
@trinsec lights A and B are meant to be switches A and B