I.S. EN 50522:2010

1 Scope
2 Normative references
3 Terms and definitions
4 Fundamental requirements
5 Design of earthing systems
6 Measures to avoid transferred potential
7 Construction of earthing systems
8 Measurements
9 Maintainability
Annex A (normative) - Method of calculating permissible touch
        voltages
Annex B (normative) - Touch voltage and body current
Annex C (normative) - Type and minimum dimensions of earth
        electrode materials ensuring mechanical strength and
        corrosion resistance
Annex D (normative) - Current rating calculation of earthing
        conductors and earth electrodes
Annex E (normative) - Description of the recognized specified
        measures M
Annex F (normative) - Measures on earthing systems to reduce the
        effects of high frequency interference
Annex G (normative) - Detailed measures for earthing of equipment
        and installations
Annex H (normative) - Measuring touch voltages
Annex I (informative) - Reduction factors related to earth wires
        of overhead lines and metal sheaths of underground cables
Annex J (informative) - Basis for the design of earthing systems
Annex K (informative) - Installing the earth electrodes and
        earthing conductors
Annex L (informative) - Measurements for and on earthing systems
Annex M (normative) - Details on site inspection and documentation
        of earthing systems
Annex N (informative) - The use of reinforcing bars in concrete
        for earthing purpose
Annex O (informative) - Global Earthing System
Annex P (normative) - Special national conditions
Annex Q (informative) - A-deviations

Applies 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.