This European Standard is applicable to specify the requirements for the design and erection of earthing systems of electrical installations, in systems with nominal voltage above 1 kV a.c. and nominal frequency up to and including 60 Hz, so as to provide safety and proper functioning for the use intended.For the purpose of interpreting this standard, an electrical power installation is considered to be one of the following:a) substation, including substation for railway power supply;b) electrical installations on mast, pole and tower; switchgear and/or transformers located outside a closed electrical operating area;c) one (or more) power station(s) located
DS/EN 50522:2011 history
2011DS/EN 50522:2011 Earthing of power installations exceeding 1 kV a.c.