My kitchen island has a wire for power. Surprisingly, nothing is connected to it so I'm going to install a power outlet.
I've replaced power outlets for walls before and generally the rear where you stick the wires in are exposed (because it's inside the wall).
However, this one will be inside the cabinet. I don't want anyone to be able to accidentally touch the back of the power outlet.
Is there anything I can buy that'll cover the back?
You need to mount an electrical box to the wall of the cabinet and put the outlet inside it.
If you can't easily do the work inside the cabinet, you can use a thin surface mount box on the outside. The box screws to the cabinet wall, and you drill a hole through the cabinet wall behind the box to feed the wire into the box. A standard wall plate goes over the outlets.
Here are a couples of examples from Home Depot:
Non-metallic example: (this one happens to come complete with outlet and coverplate)
As DrMoishe Pippik points out, a kitchen outlet needs to be GFCI protected. If the wire was pre-run, it should come from a GFCI source, perhaps one of the protected kitchen outlets. You could check this by temporarily connecting a load, like a light, or a voltmeter, and tripping the kitchen GFCI outlets with the test button. There are also inexpensive outlet testers that have a built-in GFCI test button. If the line is protected somewhere else, the button will trip it (and then you can search for its location, like in the garage or basement). If the wire is not protected, use a GFCI outlet on the cabinet.
Most electric codes require wiring devices be mounted in junction boxes. You should consult the codes in your location. Below is a nonmetallic box, which might or might not be acceptable. From the tenor of the question, it seems you might want help in wiring this correctly -- mistakes can be fatal to an appliance user. BTW, in a kitchen, GFCI outlets are recommended.
In this case 1/2" to 3 1/4" car flex and appropriate male and female connector along with a strap or two to fasten the flex to the interior wall of island.
As far as I can tell no one has tried to answer the OP's question. Let me try: I have the same predicament and the only thing I found was Blue Sea 4026 AC isolation cover, but they are like $25-30 each. Basically a 5 sided platic box with screw tabs. I used them on my sailboat and they're sturdy, and are nicely rounded. They served more to prevent accidental nicks and scrapes than to protect from shock. They also sell a larger size.
