This standard for immunity requirements applies to electrical and electronic apparatus intended for use in the residential, commercial and light-industrialenvironment,as described in clause 5, for which no dedicated product or product-family immunity standard exists. Apparatus designed to radiate electromagnetic energy for radio communications purposes is excluded from this standard. Immunity requirements in the frequency range 0 Hz to 400 GHz are covered. Where a relevant dedicated product or product-family EMC immunity standard exists, this shall take precedence over all aspects of this generic standard. The immunity requirements have been selected so as to ensure an adequate level of immunity for apparatus at residential, commercial and light-industrial locations. The levels do not however cover extreme cases which may occur in any location but with an extremely low probability of occurrence. Apparatus installed in the locations covered by this standard are considered to be directly connected to low-voltage public mains supplies or to a dedicated DC source which is intended to interface between the apparatus and the low-voltage public mains supply. Apparatus intended to be connected to an industrial power network or to special power supply sources are covered by another generic standard.