EN IEC 63522-33:2025
(Main)Electrical relays - Tests and measurements - Part 33: Continuity of protective earthing connection
Electrical relays - Tests and measurements - Part 33: Continuity of protective earthing connection
IEC 63522-33:2025 This part of IEC 63522 is used for testing all kind of electrical relays and for evaluating their ability to perform under expected conditions of transportation, storage and all aspects of operational use. This document provides test methods to ensure that the connection between an earthing terminal and parts required to be connected thereto is of low resistance.
Elektrische Relais - Mess- und Prüfverfahren - Teil 33: Kontinuität der Schutzleiterverbindung
Relais électriques - Essais et mesurages - Partie 33: Continuité de la connexion de terre de protection
IEC 63522-33:2025 La présente partie de l'IEC 63522 traite des essais de tous les types de relais électriques et elle évalue leur aptitude à fonctionner dans les conditions prévues de transport, de stockage et dans tous les aspects de leur utilisation opérationnelle. Le présent document donne des méthodes d’essai permettant d’assurer que la connexion entre une borne de terre et les parties qui doivent y être raccordées est de faible résistance.
Električni releji - Preskusi in meritve - 33. del: Neprekinjena zaščita ozemljitvenega priključka
General Information
Overview
EN IEC 63522-33:2025 - "Electrical relays - Tests and measurements - Part 33: Continuity of protective earthing connection" is a CLC-adopted part of the IEC 63522 series. It specifies test methods to verify that the connection between an earthing terminal and all parts required to be connected to protective earth is of low resistance. The standard applies to relays intended for mains connection that are provided with an earthing terminal (examples include electromechanical, reed, solid-state and time relays).
Key Topics and Requirements
- Scope: Tests for continuity of protective earthing connection on electrical relays; used to evaluate performance during transport, storage and operation.
- Test current and source: Apply a current of 1.5 × rated current, but not less than 25 A, from a source with a no‑load voltage ≤ 12 V (AC or DC).
- Measurement method: Measure the steady-state voltage drop between the earthing terminal and each part expected to be connected to earth, then calculate resistance from the applied current and measured voltage.
- Resistance limit: Default acceptance limit is 0.1 Ω, unless a different limit is specified.
- Practical considerations:
- Ensure probe contact resistance does not affect results (clean contact points, appropriate probe tips).
- Alternative test methods that yield consistent results are permitted.
- Conditions to specify: test current, test voltage, which parts are tested, resistance limit (if different from 0.1 Ω), and any deviation from the prescribed method.
- Evaluation and reporting: A device passes when measured resistance does not exceed the limit for each part. The test report should document DUT count and condition, test conditions, probe locations, per-device evaluation, equipment/setup and results.
Applications and Who Uses It
- Used by relay manufacturers for design verification and production testing of earthing continuity.
- Employed by test laboratories and quality assurance teams to demonstrate compliance and to produce reproducible test records.
- Relevant to safety engineers, compliance officers and procurement teams specifying relay performance for mains-connected equipment where protective earthing continuity is critical.
Related Standards
- EN IEC 63522-0:- (Electrical relays - Tests and measurements - Part 0: General and guidance) - to be used in conjunction with this part.
- IEC 60050-195 (IEV): terminology for earthing and protection against electric shock.
Keywords: EN IEC 63522-33:2025, electrical relays, protective earthing, earthing terminal, continuity test, test current, contact resistance, resistance limit, relay testing.
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2025
Električni releji - Preskusi in meritve - 33. del: Neprekinjena zaščita ozemljitvenega
priključka
Electrical relays - Tests and Measurements - Part 33: Continuity of protective earth
connection
Elektrische Relais – Mess- und Prüfverfahren – Teil 33: Kontinuität der
Schutzleiterverbindung
Relais électriques - Essais et mesurages - Partie 33: Continuité de la connexion de terre
de protection
Ta slovenski standard je istoveten z: EN IEC 63522-33:2025
ICS:
29.120.70 Releji Relays
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 63522-33
NORME EUROPÉENNE
EUROPÄISCHE NORM October 2025
ICS 29.120.70
English Version
Electrical relays - Tests and measurements - Part 33: Continuity
of protective earthing connection
(IEC 63522-33:2025)
Relais électriques - Essais et mesurages - Partie 33: Elektrische Relais - Mess- und Prüfverfahren - Teil 33:
Continuité de la connexion de terre de protection Kontinuität der Schutzleiterverbindung
(IEC 63522-33:2025) (IEC 63522-33:2025)
This European Standard was approved by CENELEC on 2025-09-23. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard 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 European Standard 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
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 63522-33:2025 E
European foreword
The text of document 94/1129/FDIS, future edition 1 of IEC 63522-33, prepared by TC 94 "Electrical
relays" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-10-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-10-31
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.
This document is read in conjunction with EN IEC 63522-0:— .
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.
Endorsement notice
The text of the International Standard IEC 63522-33:2025 was approved by CENELEC as a European
Standard without any modification.
Under preparation. Stage at the time of publication: prEN IEC 63522-0:2024.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
2 3
IEC 63522-0 — Electrical relays - Tests and Measurements EN IEC 63522-0 —
- Part 0: General and Guidance
Under preparation: Stage at the time of publication: IEC/CDV 63522-0:2024.
Under preparation. Stage at the time of publication: prEN IEC 63522-0:2024.
IEC 63522-33 ®
Edition 1.0 2025-08
INTERNATIONAL
STANDARD
Electrical relays- Tests and measurements -
Part 33: Continuity of protective earthing connection
ICS 29.120.70 ISBN 978-2-8327-0649-7
IEC 63522-33:2025-08(en)
IEC 63522-33:2025 © IEC 2025
CONTENTS
FOREWORD . 2
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Test procedure . 4
4.1 Purpose . 4
4.2 Procedure . 5
4.3 Conditions . 5
5 Evaluation . 5
5.1 General . 5
5.2 Test report . 5
Bibliography . 6
IEC 63522-33:2025 © IEC 2025
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Electrical relays - Tests and measurements -
Part 33: Continuity of protective earthing connection
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
...
Frequently Asked Questions
EN IEC 63522-33:2025 is a standard published by CLC. Its full title is "Electrical relays - Tests and measurements - Part 33: Continuity of protective earthing connection". This standard covers: IEC 63522-33:2025 This part of IEC 63522 is used for testing all kind of electrical relays and for evaluating their ability to perform under expected conditions of transportation, storage and all aspects of operational use. This document provides test methods to ensure that the connection between an earthing terminal and parts required to be connected thereto is of low resistance.
IEC 63522-33:2025 This part of IEC 63522 is used for testing all kind of electrical relays and for evaluating their ability to perform under expected conditions of transportation, storage and all aspects of operational use. This document provides test methods to ensure that the connection between an earthing terminal and parts required to be connected thereto is of low resistance.
EN IEC 63522-33:2025 is classified under the following ICS (International Classification for Standards) categories: 29.120.70 - Relays. The ICS classification helps identify the subject area and facilitates finding related standards.
You can purchase EN IEC 63522-33:2025 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.
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