Sounds like it’s neccersary in the us too if you have cables rates at lower power than the circuit. I have lights with cables rated at well under 3A, they plug

Sounds like it’s neccersary in the us too if you have cables rates at lower power than the circuit. I have lights with cables rated at well under 3A, they plug into the same outlet that a 10A cable can plug into. How do you stop a fault which draws 7A?