The best way to avoid it is to have no illegal appliances. I don't need illegal appliances myself. I once saw a girl with long hair using an electric heating rod and a hair dryer in the dormitory. In the next semester of senior three, she washed her hair and hurried out to use a hair dryer. She also told us that the hair dryer didn't seem to work well before. Shortly after the voice fell, his hair dryer began to spark, burning her pants, and the dormitory smelled of burning. I was talking to him and witnessed the whole process. It was really scary. So for the safety of yourself and others, don't choose illegal electrical appliances.