Electrical – Why do insulated screwdrivers have a maximum voltage that they’re rated for

If your wall is closed up then you don't have to worry about it. It looks like class 2 wire is rated to go into walls. Only use wire that is rated to be in the walls for uses like what you have. The only things to worry about with class 2 or class 3 wiring is:

1. Class 2/3 should never be used in the same electrical box (without a low voltage divider or in the same conduit with your house wiring.
2. Class 2/3 should be kept at least 10" away from house wiring. Try to run in a separate bay.
3. Remember when crossing house wiring with class 2/3 it should be at 90 degrees.

If your wall is open then if you can spare the money for ENT or smurf tube (bendable, corrugated, PVC that is usually blue) then that will give your wiring more protection. It is sold in 10ft lengths or 100ft coils. You can run low-voltage class 2/3 or regular house wiring, but not at the same time. It will also give the transmission that is carried on the class 2/3 less interference when around house wiring.

What you want to do is terminate the wires in the junction box using Wire Nuts. Simply thread them on to the end of the exposed wire, and you need not worry about live wires touching, kids getting zapped, etc. You should turn off the branch circuit in question (via a circuit breaker or removing a fuse) while removing the outlet and putting on the wire nuts.

If you need to have the box open for a more extended period of time, get a flat cover plate for the junction box (put on the wire nuts, tuck the wire back in the box, attach the cover plate).