Before installing the "Small Cooling Fan", to know if it is safe carrying capacity of power lines can meet the requirement that the carrying capacity of the supply line conductor is not less than the operating current of electrical equipment. Working current phase AC 220V electrical equipment, use its power divided by 220V rated voltage thousand estimates. To ensure the safety of "Small Cooling Fan" power lines, knife switches at the distribution box installation branded wire, when the line current is too large, branded branded silk cut off power to avoid accidents, protect lines and electrical equipment security. Must comply with the specifications of branded wire line protection requirements can not arbitrarily increase, but not with other conductors one thousand instead. To ensure the "Small Cooling Fan" electrical safety in the end the best household install leakage protection switch.