German law. To be more precise for a court to accept a company’s claim that continued employment would be an undue burden they want to see a) at least six weeks in a year b) negative prognosis, and c) how impactful the whole thing is for things like scheduling, that also depends on company size. Seniority also plays into it but noone at Tesla has any kind of seniority. That is, if healing from a burst appendix takes seven weeks no you don’t have a case because appendices don’t tend to burst twice, if your employee first breaks their leg and then goes base jumping again and breaks their arm and then does it again and breaks the other leg, different topic.
Companies are of course not forced to terminate you and a car manufacturer might be well-advised to retain a hard to replace star engineer, a random replaceable accountant, not so much.
IG Metall has a page about it. It also pays to pay your union dues because they all come with legal insurance. Thinking of it IG Metall might have the second largest army of lawyers in the world, right after Oracle.
Yes in principle to male plug, no to 240V unless the inverter sees a frequency to sync to. They won’t power anything during a power outage that requires the whole electrical installation to be set up for it so you don’t leak power to the outside and fry a lineman. Also that inverter attaches to one phase only which means that its power won’t even reach 2/3rds of your circuits. It does make the power meter go backwards though which is the point.
That said, ideally you’re using Wieland plugs and not Schuko so you won’t have exposed prongs. The VDE certified Schuko for feeding in up to 800W though and that’s exactly the amount parliament said doesn’t require a permit or even talking to your utility. If you’re doing everything new going with Wieland is the sane choice those outlets don’t cost a fortune, if it’s an existing installation though a) your landlord might not like it and b) electricians will demand more in travel costs than the outlet is worth.