He is very hard-of-thinking when it comes to voltages - no matter how many times people here try (and trust me - many people have tried many times) to explain the concept of "nominal" he just isn't bright enough to understand it.Where did you get that dimmer, it quotes 200 to 230 volts? Your supply probably exceeds that and may be as high as 253 volts.
Unfortunately for everybody else he does not see why his lack of intelligence and understanding should stop him from giving "advice".
Please don't insult other posters. Nothing on that dimmer says anything about nominal voltages. It clearly says 200-230v. That makes a nominal of 220v. Almost certainly a far eastern import from a country that uses 220v. Clearly not designed for up to 253v.