Plugging your car in the rain

been doing it for 5 years without asking anyone.

 

They recommend you don't sing while doing it.

 

There are many routines that test to see that it is safe before applying power. One you can see, is that the power connectors are longer than the sense connectors, so the insulators are already protecting you before the computers start chatting and testing to power them on. No chance of open sparks.