here here :

X: I was asked in one office after repair to finish the grid.
Y: And what?
X: Type there all the cables in the wall are laid, you only need to end the cable with the sockets and remove it on the switch.
and no-no
X: It turned out that in the wall one cable was laid through all the sockets in a row.
Y: Bugga

I did a repair in my apartment and just likewise laid a twisted pair in the stomach.Two nights after work with cancer stood near those rodets.I thought that the knives didn't live to the end,or the connection option was not the same (A or B).I broke the wires, paired, broke again.
Thank you, Alexei, a highlight from Kiev.Explained that this signal has nothing to do with electricity and parallel connections do not twist))))