I came across newer Residential Remodel, in Southern California, where All work is alleged to have been properly Permitted by local jurisdiction" including electrical-system wiring for garage-door opener and a bathroom' s ventilation fan that backs into an interior' s hallway closet, see pics. My question is the wiring' s type and / or wiring method are acceptable or done in accordance to common construction practice?
Electrical wiring methods , Acceptable or Not-Acceptable
electricalwiring
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As far as I recall, the main differences are using appropriate metal screws to attach (standard) boxes, and using bushings (should be either provided with framing or easily available from the framing supplier or an electrical supplier) to protect wires passing through the framing.
This guide from "steelframing.org" might be a helpful read.
I'm not sure what type of relay you're using, but most relays have at least five terminals. two coil terminals, used to power the coil. One common (C) terminal, where the circuit to be controlled will connect. One normally closed (NC) terminal; which is as it sounds, the side of the switch that is closed when no power is supplied to the coil. And one normally open (NO) terminal, the side of the switch that is open when no power is supplied to the coil.
When power is supplied to the coil, the relay is toggled. The NC contact will now be open, and the NO contact will be closed. This is fairly similar to how 3-way switches work, except that with a 3-way you are the coil (sort of) and determine which way the switch is.
Because of this, you could wire up a circuit like this...
However, this setup isn't going to be very smart, since the Raspberry pi is simply going to be switching the current state of the load. So whether the lights go on or off, will depend on the state of the 3-way.
To make this system smarter, you can add in a current transformer (CT), and connect the leads from the CT back to the pi.
With this setup, the pi can use the output of the CT to determine the state of the lights. So the pi could either toggle the relay to turn the lights on/off, or not toggle the relay to leave the lights on/off. In any event, the 3-way switch would still work properly.
I don't know much about the Raspberry pi, so I'm not sure it has the ability to work in this way. I also don't know exactly what equipment you're using. I'm simply suggesting a possible solution.
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Best Answer
Above 8’ the Romex or nmb can be exposed , the only thing I see not 100% is the staple with the wire sideways. It could be 14-3 and round wire but the other pieces look flat so other than that it would meet minimum code but not a nice job that’s for sure. You don’t show the cable going in the garage door opener or light if there are clamps that would be the only thing left to check. We can’t see if there is a nail plate in that notched ceiling joist maybe that could be a violation where the wire goes in between or is it just going through the Sheetrock then it would be ok. The fan box ? Edit The Romex should be nailed within 12” but I think my early thought about a nail plate may be wrong as it goes through the ceiling and someone put mudd over it. If it was stapled there it may have been ok.