Don't we have this problem with regular electrical cables, but instead of not working you blow a circuit breaker or just start an electrical fire? There is very little stopping me from going to a wall socket and hooking up a 20 amp welder in a 15 amp plug and cranking it so the breaker trips or worse.

edit: I wrote this but then realized other countries other then the US exist and handle electricity differently, my example only applies to the US