This standard is applicable to electrical and electronic equipment for household and similar use, intended to be connected to low-voltage a.c. distribution systems of the following types: nominal voltages up to 240 V, single-phase, two or three wire; nominal voltages up to 415 V, three-phase, three or four wire; nominal frequency 50 Hz or 60 Hz. Examples of electrical equipment to which this standard applies are appliances for cooking and heating, motor-operated or magnetically driven appliances, and portable tools. This standard is not applicable to: equipment subject to notification to or consent by the supply authority before connection to the system (consent by the supply authority may be requested for high-power appliances which are intended to be used only in systems having impedances considerably lower than the reference impedance. General consent may be declared for use of a type of appliance in a defined part of the supply system) : equipment intended exclusively for professional purposes; appliances and equipment without automatic control means; appliances producing less than one voltage change per hour; appliances producing more than 1800 voltage changes per minute; disturbances caused by manual switching