All your electrician had to do was read the voltage information on the new 30 amp outlet! He is not an electrician. Very much a newbie apprentice. I was there once.
FYI. Fuses are rated in Amperage not voltage. (Just leave it there you guys). Just trying to keep it simple.
Your electrician probably hooked your outlet to a 30 amp 2 pole breaker unless you house has an old fuse system..