Where to start, oh where to start.
Pualuk- As I said above, the apprentice and the licensed electrical employee can work free of concern of negligence liability. The employer overseeing the work (or not even on the job site) will eat any damages that result as a result of work he billed on.
Sparky- Bare with me guys, I am still not sure what State is everyone from. Many States don't take the approach I would like to see against unlicensed workers doing electrical jobs. In NY a homeowner can do their own electrical work, but someone for hire must be licensed. More often than not a contractor will come in to remodel a bath/kitchen and will say that an electrician is not needed, and in an effort to save the homeowner money he tells the homeowner to apply for what ever permits may be needed and the contractor does the work. Say some time down the line a box isn't grounded and the same scenario as above (barefoot and wet) results in death- who is liable. The homeowner, when filing for the permits indicated that he was doing the work, Here the contractor is getting away with murder. The best advice is join your local Electrical Associations, Here in NY I am the attorney for the Suffolk County Electrical Contractors Association (SCECA) There is Strength in numbers, Associations such as SCECA can lobby to have local politicians put programs in place to fine/jail unlicensed electricians.