1. Did the electrician have any control over the voltage when the system
was rewired?

2. Is it normal for electricians to measure the voltage, and "do
something"
about it if it's not correct (if only reporting the problem to the
businessman)?

You missed the point of the original post. The person who did the work was
NOT an electrician, they were a "handyman" hired to do the work.

I didn't miss the point (I think). He was doing the work of an electrician.
And whether or not he was a licensed electrician, he is still morally
responsible for the quality of his work. (Think Hamurabi.)


Since the person never said where they were, it's hard to guess what the
rules are but in (almost?) every jurisdiction that licenses
electricians, a license is needed to do electrical work.

If an unlicensed person does electrical work, the work has to be inspected
by a licensed electrician before the power is turned on. If that was not
the
case, there would be no point in licensing electricians, would there?

No, there wouldn't be. But if he botched the job, he has to be held
responsible. Doesn't he?

Of course, one might argue that if the person who hired him /knew/ he wasn't
an electrician, and didn't have the work inspected, then he (the hirer) is
responsible for whatever went wrong.