This is actually pretty interesting. I read over your couple of pages you sent me.

As far as safety margins, I'm not sure. I know that the highest I have ever seen on mine was in the low 400 volt range, but I also know the newer Model S has a 500 volt configuration, and the model 3 is approximately 350 volts. I know that they wouldn't run the connector right up to its tolerance, or I think even within 25% of it. That with the model 3 is part of what really surprises me, though. I'm not sure how they are pulling that off, if maybe the model 3 connector is slightly different of the car end. I have looked at mine in detail obviously, but it's old now. I'm still somewhat impressed every time I see much over 100kw (seen low 120s), at over 300 amps at 400 volts. I don't use the supercharger often, though.