@TobyBartels @Chrishallbeck ISTR the sockets for public use in my library are connected to 6A RCD circuit breakers (shared across 2 tables as a radial circuit) with a prominent warning by each about this limitation) instead of a 16A radial or 32A ring final (this is the UK where we have different wiring schemes) - so all laptops and mobile phone chargers are OK, but plugging in a space heater (or anything that is grossly defective) will just open this circuit breaker and isolate the power..