> Electricians that can't tighten a simple
> screw, need to find another career
Don't be so quick to blame the electrician. The electricity itself can cause terminals to come loose. It's common practice with factories and high-rise building to shut everything down once a year so that all the electrical connections can be checked and tightened.
Also here years ago it was thought to be good practice to solder a wire before putting it in a screw terminal. It was a while before someone finally realized that the solder slowly deforms away from under the screw so it is actually a good way of ensuring that you eventually end up with a bad connection. I've fixed a number of these bad connections caused by electricians who believed at the time that they were doing the right thing.
Another problem is the type of terminals now used on most circuit breakers. If you accidently stick the wire in behind the terminal it will feel like the terminal is tight and the wire secure but a day or 2 later you will have a loose connection. It's very easy to accidently do when you don't have a good view of the terminal.
