EN 50522:2022/A1:2024
(Amendment)Earthing of power installations exceeding 1 kV a.c.
Earthing of power installations exceeding 1 kV a.c.
Modification to EN 50522:2022
Erdung von Starkstromanlagen mit Nennwechselspannungen über 1 kV
Prises de terre des installations électriques de puissance en courant alternatif de tension supérieure à 1 kV - Amendement 1
Ozemljitev elektroenergetskih postrojev, ki presegajo 1 kV izmenične napetosti - Dopolnilo A1
General Information
Relations
Overview
EN 50522:2022/A1:2024 is a CENELEC amendment to the European standard EN 50522:2022 addressing the earthing of power installations exceeding 1 kV a.c.. Published September/November 2024, this A1 amendment updates normative references, terms and definitions, and multiple technical clauses to align with IEC 61936-1:2021. It clarifies safety, functional and measurement requirements for earthing design, touch-voltage assessment and verification of high-voltage (HV) installations and associated low-voltage (LV) systems.
Key Topics
- Normative reference update: replaces IEC 61936-1:2010 with IEC 61936-1:2021 throughout the standard.
- Terms & definitions: revisions to definitions (e.g., touch/effective touch voltage), added notes and source attributions consistent with IEC 61936‑1:2021.
- General, electrical and functional requirements: modified clause references to IEC 61936‑1:2021; explicit requirements for examining faults inside and outside installation boundaries and identifying worst-case fault locations.
- Safety criteria and permissible touch voltages: safety criteria now reference IEC 61936‑1:2021 clauses; Annex B (method for calculating permissible touch voltages UTp) updated and clarified (including additions such as “bare skin to bare skin” wording).
- HV/LV earthing interactions: updates to sections on HV and LV earthing systems, including LV supply arrangements inside/outside HV substations and guidance when LV neutral/PEN connections affect touch voltage.
- Dimensioning with regard to touch voltages: Figure and clause references updated to IEC 61936‑1:2021; Table 2 footnote amended describing the typical factor F (typical F = 2, may be up to 5; F = 1 when PEN/neutral is earthed only at the HV system) and soil resistivity cautions.
- Installation, lightning and measurements: references and requirements for earth electrodes, lightning/transient protection, inspections and measurements updated to the 2021 IEC edition.
Applications
- Design and verification of earthing systems for HV substations and power installations >1 kV a.c.
- Calculation and assessment of touch voltages and safety limits for personnel and public safety.
- Integration of HV earthing with LV supply arrangements, including PEN/neutral considerations.
- Inspection, testing and commissioning protocols for utilities, EPC contractors and consultants.
- Risk assessment and compliance documentation for regulators and asset owners.
Who should use this standard
- Substation and earthing designers, protection and grounding engineers
- Power utilities and transmission/distribution network operators
- Electrical safety inspectors, test laboratories and consultants
- Standards bodies and regulatory authorities
Related standards
- IEC 61936-1:2021 (primary normative reference)
- Relevant parts of IEC 60050 and IEC 60479 series as cited for definitions and body current/fibrillation guidance
Keywords: EN 50522:2022/A1:2024, earthing, power installations exceeding 1 kV a.c., IEC 61936-1:2021, touch voltage, HV substations, earthing systems, PEN conductor, permissible touch voltages.
Frequently Asked Questions
EN 50522:2022/A1:2024 is a amendment published by CLC. Its full title is "Earthing of power installations exceeding 1 kV a.c.". This standard covers: Modification to EN 50522:2022
Modification to EN 50522:2022
EN 50522:2022/A1:2024 is classified under the following ICS (International Classification for Standards) categories: 29.120.50 - Fuses and other overcurrent protection devices. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 50522:2022/A1:2024 has the following relationships with other standards: It is inter standard links to EN 50522:2022. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase EN 50522:2022/A1:2024 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CLC standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2024
Ozemljitev elektroenergetskih postrojev, ki presegajo 1 kV izmenične napetosti -
Dopolnilo A1
Earthing of power installations exceeding 1 kV a.c.
Erdung von Starkstromanlagen mit Nennwechselspannungen über 1 kV
Prises de terre des installations électriques de puissance en courant alternatif de tension
supérieure à 1 kV
Ta slovenski standard je istoveten z: EN 50522:2022/A1:2024
ICS:
29.240.01 Omrežja za prenos in Power transmission and
distribucijo električne energije distribution networks in
na splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN 50522:2022/A1
NORME EUROPÉENNE
EUROPÄISCHE NORM September 2024
ICS 29.120.50
English Version
Earthing of power installations exceeding 1 kV a.c.
Prises de terre des installations électriques de puissance en Erdung von Starkstromanlagen mit
courant alternatif de tension supérieure à 1 kV Nennwechselspannungen über 1 kV
This amendment A1 modifies the European Standard EN 50522:2022; it was approved by CENELEC on 2024-07-02. CENELEC members
are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this amendment the status of a
national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This amendment exists in three official versions (English, French, German). A version in any other language made by translation under the
responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as
the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50522:2022/A1:2024 E
Contents Page
European foreword . 3
1 Modification to Clause 2, “Normative references” . 4
2 Modifications to Clause 3, “Terms and definitions” . 4
3 Modification to 4.1, “General requirements” . 5
4 Modifications to 4.2, “Electrical requirements”. 5
5 Modifications to 4.3, “Safety criteria” . 5
6 Modification to 4.4, “Functional requirements” . 5
7 Modifications to 5.4, “Dimensioning with regard to touch voltages” . 5
8 Modification to 6.1.1, “High and low voltage earthing systems” . 5
9 Modification to 6.1.2, “LV supply only within HV substations” . 6
10 Modification to 6.1.3, “LV supply leaving or coming to HV substations” . 6
11 Modification to 6.1.4, “LV in the proximity of HV substation” . 6
12 Modification to 7.1, “Installation of earth electrodes and earthing conductors” . 6
13 Modification to 7.2, “Lightning and transients” . 6
14 Modification to Clause 8, “Measurements” . 6
15 Modification to 9.1, “Inspections” . 6
16 Modification to 9.2, “Measurements” . 6
17 Modification to A.1, “Method of calculating permissible touch voltages UTp” . 6
European foreword
This document (EN 50522:2022/A1:2024) has been prepared by CLC/TC 99X “Power installations exceeding
1 kV a.c. (1,5 kV d.c.)”.
The following dates are fixed:
• latest date by which this document has to be (dop) 2025-07-02
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2027-07-02
conflicting with this document have to be
withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
1 Modification to Clause 2, “Normative references”
Replace the reference to IEC 61936-1:2010 with the following:
IEC 61936-1:2021, Power installations exceeding 1 kV AC and 1,5 kV DC - Part 1: AC
2 Modifications to Clause 3, “Terms and definitions”
In 3.2:
delete “effective touch voltage”,
add “” in the definition
replace the first source with the following:
“[SOURCE: IEC 60050-195:2021, 195-05-11, modified – The symbol U has been added. In the definition, “by
T
a human being or livestock” has been deleted. In Note 1 to entry, “of the human being or livestock” has been
r
...
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