Earthing of power installations exceeding 1 kV a.c.
This document 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 AC and nominal frequency up to and
including 60 Hz, so as to provide safety and proper functioning for the use intended.
NOTE 1 The technical and procedural principles of this document can be applied when third parties’ installations and
facilities are planned and/or erected in the vicinity of HV electrical power installations.
For the purpose of interpreting this document, an electrical power installation is considered to be one of the
following:
a) substation, including substation for railway power supply;
b) electrical power 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 on a single site;
the electrical power installation includes generators and transformers with all associated switchgear and all
electrical auxiliary systems. Connections between generating stations located on different sites are
excluded;
d) the electrical system of a factory, industrial plant or other industrial, agricultural, commercial or public
premises;
e) electrical power installations on offshore facilities for the purpose of generation, transmission, distribution
and/or storage of electricity;
f) transition towers/poles between overhead lines and underground lines.
ΚΩΔΙΚΟΣ ΠΡΟΪΟΝΤΟΣ:
CYS EN 50522:2022
This document 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 AC and nominal frequency up to and
including 60 Hz, so as to provide safety and proper functioning for the use intended.
NOTE 1 The technical and procedural principles of this document can be applied when third parties’ installations and
facilities are planned and/or erected in the vicinity of HV electrical power installations.
For the purpose of interpreting this document, an electrical power installation is considered to be one of the
following:
a) substation, including substation for railway power supply;
b) electrical power 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 on a single site;
the electrical power installation includes generators and transformers with all associated switchgear and all
electrical auxiliary systems. Connections between generating stations located on different sites are
excluded;
d) the electrical system of a factory, industrial plant or other industrial, agricultural, commercial or public
premises;
e) electrical power installations on offshore facilities for the purpose of generation, transmission, distribution
and/or storage of electricity;
f) transition towers/poles between overhead lines and underground lines.