This International Standard deals with the safety of electric stationary circulation pumps intended for use in heating systems or in service water systems, having a rated power input not exceeding 300 W, their rated voltage being not more than 250 volt for single-phase appliances and 480 volt for other appliances. The hydraulic and electrical parts of the pump may be in the same enclosure, so that the water flows through the motor and serves as a coolant, or they may be separated.