Limit the current by installing an air switch. If the voltage of the dormitory is installed at 3 A, then 220×3=660 watts, that is, the power is limited to 660 watts, and it will trip if it exceeds; 220×4=880 watts, if 4 amps are open.
Universities in the north spend the summer in summer, and the pressure of heating in winter is not great, so basically every school will cut off electricity and cut off electricity on time all year round. The power outage time of different universities is also slightly different, mostly between 10- 12 at night.
Extended data:
In some universities and factory dormitories, fires and casualties caused by illegal use of high-power electrical appliances have aroused widespread concern from all walks of life, and high-power identification and power safety controllers have been widely used.
However, this kind of products in the market adopt relay direct output action, which has short life and poor arc extinguishing performance; Some products can't effectively avoid the electric shock of computers, televisions and other electrical appliances with energy storage components. After power failure, all electrical appliances must be unplugged before they can be used again, and there are omissions and misjudgments in the use of high-power electrical appliances.