I have a three phase power point in my room (500V, 20A, 50Hz ) whats some cool stuff I can make and plug into it?

preferably something I can make cheep. I have some experiance with electronics(3rd year optoelectronics at uni) but no experience with much more than 1A and 30V circuits.

110100101108 years ago
*thinking of VERY strong electro magnet* do you use electricity to heat water ? this socket is enough for a very high power inline heater. inline heaters save 80 - 90 % energy compared to standard heaters
I'm thinking maybe some awesome steam powered objects right now...