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4

Most likely (because anything is possible), the two black wires going into one end of the switch (back stab and screw next to it) are "incoming hot" and "pass-through hot". All neutrals (white) are together (which is good) and all groups (bare copper) are together (which is required). If your new smart switch has screws: Line/hot/...


3

Elementary, My Dear One cable comes from the upstream source (the service panel or another device box). One cable is the light loop, in which the black (hot) is switched and the white (neutral) is the return. This is the only cable you can identify with any certainty without a voltage test since its path is broken by the switch. One cable simply passes ...


1

Well, ground is easy. Safety ground is a network connecting everything to everything, to ground and the grounding rods going into the dirt. It is there simply as a safety shield, and it performs no electrical function whatsoever. (except, obviously, when there is an electrical problem). So with grounds, you hook them up, you hook them up FIRST (life goes ...


2

This sounds normal: "/3" cables have 4 wires - black, red, white, bare ground. So the color (except bare ground = green = ground etc.) is almost meaningless. Where in a normal setup, black = hot and white = neutral, with 3-ways you have a common wire (hot or switched-hot, depending on configuration) and two travelers. Since the travelers are "...


1

You want a combo cover, unfortunately there is no single term that describes that shape. Decora is brand name term works pretty good, but you can also use terms rocker, decorator, or gfci combo covers. Since you provided a link to Amazon I would caution that their pricing sometimes preys on the inattentive or uninformed buyer. You can get a effectively the ...


5

The large rectangular opening is called "Decora" There are only 3 popular shapes: Small slot: the traditional switch, like you have now. Two ovals: for traditional receptacles (also dual switches) Large rectangle aka "Decora": which covers your smart switch, AND all Decora switches, AND all Decora receptacles, including all GFCI and ...


1

You'll need to open it up to see exactly what is going on in the box and confirm that a neutral is present if it's needed for the smart switch. Flip breakers until all controlled lights turn off, then remove the plastic cover plate and screws at the top and bottom of each switch under the coverplate. Carefully pull the switches out so you can see what's ...


1

Yes, you will need a new cover plate. They make them in all sorts of combinations. Here is an example: Decorator/Toggle plate


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