My house was built in 1979.
Today I replaced these 2 lights switches.
The left switch was a simple switch. The right one was a 3-way switch (i.e. there is another switch that also controls the same ceiling light).
Original wiring
My diagram of the original wiring
It shows:
- 3 bundles of wires coming from the top of the wall box and 1 from the bottom-left.
- The circles are screw nut caps
- Blue lines represent white wires (I assume "neutral")
- 2 loose red wires (which were connected to the right switch)
- 2 loose black wires (which were connected to the left switch)
- 2 loose green (copper) wires (each switch was connected to 1)
- 1 loose white wire (which was connected to the right switch)
Is what I did here safe and up to code?
2 mins: https://photos.app.goo.gl/BZxXbzoxf8EXxTsi6
Secondary questions out of curiosity
- Why are ground wires from all 4 bundles clumped together (shown at 0:32)? Is it ok that they don't have a screw nut?
- I'm a complete newbie. I would have assumed that the left and right switches would have nothing to do with each other. Yet there is mixing of wires from the 4 bundles (instead of there being 2 totally separate pairs of bundles). What am I misunderstanding?
Here is the final result, which works:
