It's nothing to do with the circuit breaker.
It's the wiring in factories and offices.
The wiring starts at one end of a house or factory and by the time it reaches the end, the few ohms resistance in the wiring is sufficient to drop the voltage 10v and the photocopier or other device drops out.
For a 2,000w photocopier, the current is nearly 20 amps and if the resistance is 1 ohm, the voltage drop is 20v.
Our "mains wiring" is 2.5 sq mm and this is for a normal 10 amp run. This is equivalent to your size 10.
The US normal run is done with size 14 and this is 1.6 sq mm and has twice the resistance.
That's why I had so many problems.