Describes electrical and electronic apparatus for use in a residential, commercial and light-industrial environment where no dedicated product or product-family emission standard exists. Apparatus designed to radiate electromagnetic energy for radio communications purposes is excluded. Disturbances in the frequency range 0 Hz to 400 GHz are covered. Where a relevant dedicated product or product-family EMC emission standard exists, this shall take precedence. Fault conditions of apparatus are not taken into account. Apparatus installed in the locations covered by this standard are considered to be connected to low-voltage public mains supplies or to a dedicated DC source.