I have a dryer outlet that caught fire charging our little i3. I'm not sure why GP said "some countries" -- I'm in the US. The heat warped the plastic just enough to bridge one leg of the power socket to ground. It got pretty melty before the house breaker stopped things.

The torched outlet was installed specifically to charge prior homeowner's EV and was only 3 years old.

I moved to an EV-rated 50A outlet which can handle the duty cycle. We have charged two EVs off of it and so far so good. It has a cute little green logo on it and costs 5x as much as a typical NEMA plug. :) Weighs about 5x as much too and grips the grizzl-e plug very tightly and with much larger contact areas.

I'm a believer.