these three boxes cover about 99 percent of your needs. The purpose of electrical boxes Wiring connections—where wires join an outlet, switch or other wires—must be inside an electrical box.

Electrical box extenders are sturdy rings that attach to an existing electrical box, covering the newly installed ... which is likely in residential wiring, use a plastic (PVC) extender.

It's always a good time for a reminder of some of the ways that we can become "electricity blind" in our own homes.