SIST EN 61558-2-4:2010

Safety of transformers, reactors, power supply units and similar products for voltages up to 1100 V -- Part 2-4: Particular requirements and tests for isolating transformers and power supply units incorporating isolating transformers

IEC 61558-2-4:2009 deals with the safety of isolating transformers for general applications and power supply units incorporating isolating transformers for general applications. Transformers incorporating electronic circuits are also covered by this standard. This second edition cancels and replaces the first edition published in 1997. It constitutes a technical revision. The main changes consist of updating this part in accordance with Part 1 (2005), and increasing the supply voltages up to 1 100 V to be in line with the standards of TC 14. This part has the status of a group safety publication in accordance with IEC Guide 104. This part is intended to be used in conjunction with the latest edition of IEC 61558-1 and its amendments. It is based on the second edition (2005) of that standard. It is the recommendation of the committee that the content of this publication be adopted for implementation nationally not earlier than 12 months from the date of publication.

Sicherheit von Transformatoren, Drosseln, Netzgeräten und dergleichen für Versorgungsspannungen bis 1100 V - Teil 2-4: Besondere Anforderungen und Prüfungen an Trenntransformatoren und Netzgeräte die Trenntransformatoren enthalten

Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et produits analogues pour des tensions d'alimentation jusqu'à 1 100 V -- Partie 2-4: Règles particulières et essais pour les transformateurs de séparation des circuits et les blocs d'alimentation incorporant des transformateurs de séparation des circuits

La CEI 61558-2-4:2009 traite de la sécurité des transformateurs de séparation des circuits pour applications d'ordre général et des blocs d'alimentation incorporant des transformateurs de séparation des circuits pour applications d'ordre général. Les transformateurs incorporant des circuits électroniques sont également couverts par cette norme. Cette deuxième édition annule et remplace la première édition publiée en 1997. Elle constitue une révision technique. Les principales modifications consistent en la mise à jour de la présente partie conformément à la Partie 1 (2005), et l'augmentation des tensions d'alimentation jusqu'à 1 100 V pour être en conformité avec les normes du TC 14. La présente partie a le statut de publication groupée de sécurité conformément au Guide CEI 104. La présente partie est destinée à être utilisée avec la dernière édition de la CEI 61558-1 et ses amendements. Elle est basée sur la seconde édition (2005) de cette norme. Le comité recommande que le contenu de cette publication soit entériné au niveau national au plus tôt 12 mois après la date de publication.

Varnost transformatorjev, dušilk, napajalnikov in podobnih izdelkov za napajalne napetosti do 1100 V - 2-4. del: Posebne zahteve in preskusi za ločilne transformatorje in napajalnike z ločilnimi transformatorji (IEC 61558-2-4:2009)

Ta del IEC 61558 obravnava varnost ločilnih transformatorjev za splošno rabo in napajalnikov z ločilnimi transformatorji za splošno rabo. Ta standard pokriva tudi transformatorje z elektronskimi vezji.

General Information

• Status: Published
• Publication Date: 14-Dec-2009
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: I96 - Imaginarni 96
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 29-Oct-2009
• Due Date: 03-Jan-2010
• Completion Date: 15-Dec-2009
• Directive: 2006/95/EC - Directive 2006/95/EC of the European Parliament and of the Council of 12 December 2006 on the harmonisation of the laws of Member States relating to electrical equipment designed for use within certain voltage limits (codified version)
• Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Ref Project: EN 61558-2-4:2009 - Safety of transformers, reactors, power supply units and similar products for supply voltages up to 1 100 V - Part 2-4: Particular requirements and tests for isolating transformers and power supply units incorporating isolating transformers

Relations

• Replaces: SIST EN 61558-2-4:1999 - Safety of power transformers, power supply units and similar -- Part 2-4: Particular requirements for isolating transformers for general use
• Effective Date: 01-Jan-2010
• Replaced By: SIST EN IEC 61558-2-4:2025 - Safety of transformers, reactors, power supply units and combinations thereof - Part 2-4: Particular requirements and tests for isolating transformers and power supply units incorporating isolating transformers for general applications
• Effective Date: 01-May-2025
• Revised: SIST EN 61558-2-4:1999 - Safety of power transformers, power supply units and similar -- Part 2-4: Particular requirements for isolating transformers for general use
• Effective Date: 06-Mar-2012

Overview

EN 61558-2-4:2009 (CLC adoption of IEC 61558-2-4:2009) gives the particular safety requirements and tests for isolating transformers and power supply units incorporating isolating transformers for supply voltages up to 1 100 V. This second edition (2009) cancels the 1997 edition, aligns Part 2‑4 with EN/IEC 61558-1 (2005) and extends the voltage range to match TC 14 standards. The publication is a group safety document and is intended to be used together with the latest edition of IEC/EN 61558-1.

Key topics and technical requirements

EN 61558-2-4 supplements or modifies Part 1 and covers practical safety and test topics, including:

• Scope and classification of isolating transformers and related power supply units
• Ratings: supply voltage and rated output requirements up to 1 100 V
• Marking and documentation requirements for safe use and identification
• Protection against electric shock, including insulation, leakage current and earthing provisions
• Insulation resistance and dielectric strength tests and leakage current verification
• Creepage distances, clearances and distances through insulation (with annexes for different material CTI groups)
• Heating, short‑circuit and overload protection and relevant test methods
• Mechanical strength, resistance to moisture, ingress protection and resistance to rusting
• Construction, components and internal wiring requirements (terminals, screws, connections)
• Resistance to heat, fire and tracking and related verification tests
• Supplementary annexes covering test specifics and explanatory material

(Note: this standard is to be applied in conjunction with the general test methods and requirements of IEC/EN 61558‑1.)

Practical applications

EN 61558-2-4 is directly applicable to:

• Design, manufacture and safety testing of isolating transformers for general applications
• Power supply units that incorporate isolating transformers, including units with embedded electronic circuits
• Safety assessment and type testing during product development and certification
• Establishing production quality checks and compliance evidence for market access in CENELEC/IEC territories

Who should use this standard

• Transformer and power supply manufacturers and design engineers
• Product compliance and safety engineers (CE marking & national adoption)
• Test laboratories, notified bodies and certification organizations
• Procurement and quality teams specifying safe transformer equipment for industrial, medical and consumer applications

Related standards

• IEC/EN 61558-1 (2005) - General requirements and tests (use in conjunction with Part 2‑4)
• Other parts of the IEC 61558 series for specific transformer and power supply types

Keywords: EN 61558-2-4:2009, isolating transformers, transformer safety, power supply units, IEC 61558-1, supply voltages up to 1100 V, creepage distances, dielectric strength, leakage current, safety tests.

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2010
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SIST EN 61558-2-4:1999
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Safety of transformers, reactors, power supply units and similar products for voltages up
to 1100 V -- Part 2-4: Particular requirements and tests for isolating transformers and
power supply units incorporating isolating transformers
Sicherheit von Transformatoren, Drosseln, Netzgeräten und dergleichen für
Versorgungsspannungen bis 1100 V - Teil 2-4: Besondere Anforderungen und
Prüfungen an Trenntransformatoren und Netzgeräte die Trenntransformatoren enthalten
Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et produits
analogues pour des tensions d'alimentation jusqu'à 1 100 V -- Partie 2-4: Règles
particulières et essais pour les transformateurs de séparation des circuits et les blocs
d'alimentation incorporant des transformateurs de séparation des circuits
Ta slovenski standard je istoveten z: EN 61558-2-4:2009
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 61558-2-4
NORME EUROPÉENNE
May 2009
EUROPÄISCHE NORM
ICS 29.180 Supersedes EN 61558-2-4:1997

English version
Safety of transformers, reactors, power supply units
and similar products for supply voltages up to 1 100 V -
Part 2-4: Particular requirements and tests for isolating transformers
and power supply units incorporating isolating transformers
(IEC 61558-2-4:2009)
Sécurité des transformateurs, bobines Sicherheit von Transformatoren, Drosseln,
d'inductance, blocs d'alimentation Netzgeräten und dergleichen
et produits analogues pour des tensions für Versorgungsspannungen bis 1 100 V -
d'alimentation jusqu'à 1 100 V - Teil 2-4: Besondere Anforderungen
Partie 2-4: Règles particulières et essais und Prüfungen an Trenntransformatoren
pour les transformateurs de séparation und Netzgeräte die Trenntransformatoren
des circuits et les blocs d'alimentation enthalten
incorporant des transformateurs (IEC 61558-2-4:2009)
de séparation des circuits
(CEI 61558-2-4:2009)
This European Standard was approved by CENELEC on 2009-03-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61558-2-4:2009 E
Foreword
The text of document 96/316/FDIS, future edition 2 of IEC 61558-2-4, prepared by IEC TC 96,
Transformers, reactors, power supply units and similar products for low voltage up to 1 100 V, was
submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61558-2-4 on
2009-03-01.
This European Standard supersedes EN 61558-2-4:1997.
The main changes consist of updating this part in accordance with EN 61558-1:2005, and increasing the
supply voltages up to 1 100 V to be in line with the standards of TC 14.
This part is intended to be used in conjunction with the latest edition of EN 61558-1 and its amendments.
It is based on EN 61558-1:2005.
This part supplements or modifies the corresponding clauses in EN 61558-1, so as to convert that
publication into the European Standard: Particular requirements and tests for isolating transformers and
power supply units incorporating isolating transformers.
Where a particular subclause of Part 1 is not mentioned in this part, that subclause applies as far as is
reasonable. Where this part states "addition", "modification" or "replacement", the relevant text of Part 1 is
to be adapted accordingly.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2009-12-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2012-03-01
In this part, the following print types are used:
– requirements proper: in roman type;
– test specifications: in italic type;
– explanatory matter: in smaller roman type.
In the text of this part, the words in bold are defined in Clause 3.
Subclauses, notes, figures and tables additional to those in Part 1 are numbered starting from 101;
supplementary annexes are entitled AA, BB, etc.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61558-2-4:2009 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 61558-2-16 NOTE  Harmonized as EN 61558-2-16:200X (not modified).
__________
- 3 - EN 61558-2-4:2009
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

Addition to Annex ZA of EN 61558-1:
Publication Year Title EN/HD Year

IEC 61558-1 2005 Safety of power transformers, EN 61558-1 2005
power supplies, reactors + corr. August 2006
and similar products -
Part 1: General requirements and tests

IEC 61558-2-4 ®
Edition 2.0 2009-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Safety of transformers, reactors, power supply units and similar products for
supply voltages up to 1 100 V –
Part 2-4: Particular requirements and tests for isolating transformers and power
supply units incorporating isolating transformers

Sécurité des transformateurs, bobines d’inductance, blocs d'alimentation et
produits analogues pour des tensions d'alimentation jusqu'à 1 100 V –
Partie 2-4: Règles particulières et essais pour les transformateurs de séparation
des circuits et les blocs d'alimentation incorporant des transformateurs de
séparation des circuits
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
N
CODE PRIX
ICS 29.180 ISBN 2-8318-1028-7
– 2 – 61558-2-4 © IEC:2009
CONTENTS
FOREWORD.3
1 Scope.5
2 Normative references .6
3 Terms and definitions .6
4 General requirements .6
5 General notes on tests .6
6 Ratings.6
7 Classification.7
8 Marking and other information .7
9 Protection against electric shock .7
10 Change of input voltage setting .7
11 Output voltage and output current under load .7
12 No-load output voltage .8
13 Short-circuit voltage .8
14 Heating .9
15 Short-circuit and overload protection .9
16 Mechanical strength .9
17 Protection against harmful ingress of dust, solid objects and moisture.9
18 Insulation resistance, dielectric strength and leakage current .9
19 Construction .9
20 Components .11
21 Internal wiring.11
22 Supply connection and other external flexible cable or cords .11
23 Terminals for external conductors.11
24 Provisions for protective earthing .11
25 Screws and connections .12
26 Creepage distances, clearances and distances through insulation.12
27 Resistance to heat, fire and tracking.12
28 Resistance to rusting.12
Annexes .13
Annex C Creepage distances (cr), clearances (cl) and distances through insulation
(dti) Material group II (400 ≤CTI <600) .13
Annex D Creepage distances (cr), clearances (cl) and distances through insulation
(dti) Material group I (CTI ≥600).13
Annex R Explanations of the application of 4.2 of IEC 60664-1:2007 (see IEC 61558-1
Subclause 26.2).13
Bibliography.14

Table 101 – Output voltage difference .

61558-2-4 © IEC:2009 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY OF TRANSFORMERS, REACTORS, POWER SUPPLY UNITS
AND SIMILAR PRODUCTS FOR SUPPLY VOLTAGES UP TO 1 100 V –

Part 2-4: Particular requirements and tests
for isolating transformers and power supply units
incorporating isolating transformers

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
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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equipment declared to be in conformity with an IEC Publication.
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International standard IEC 61558-2-4 has been prepared by IEC technical committee 96:
Transformers, reactors, power supply units and similar products for low voltages up to
1 100 V.
This second edition cancels and replaces the first edition published in 1997. It constitutes a
technical revision. The main changes consist of updating this part in accordance with Part 1
(2005), and increasing the supply voltages up to 1 100 V to be in line with the standards of TC
14.
This part has the status of a group safety publication in accordance with IEC Guide 104
(1997): The preparation of safety publications and the use of basic safety publications and
group safety publications.
– 4 – 61558-2-4 © IEC:2009
The text of this standard is based on the following documents:
FDIS Report on voting
96/316/FDIS 96/321/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This part is intended to be used in conjunction with the latest edition of IEC 61558-1 and its
amendments. It is based on the second edition (2005) of that standard.
This part supplements or modifies the corresponding clauses in IEC 61558-1, so as to convert
that publication into the IEC standard: Particular requirements and tests for isolating
transformers and power supply units incorporating isolating transformers.
A list of all parts of the IEC 61558 series can be found on the IEC website under the title:
Safety of transformers, reactors, power supply units and similar products for supply voltages
up to 1 100 V.
Future standards in this series will carry the new general title as cited above. Titles of existing
standards in this series will be updated at the time of the next edition.
Where a particular subclause of Part 1 is not mentioned in this part, that subclause applies as
far as is reasonable. Where this part states "addition", "modification" or "replacement", the
relevant text of Part 1 is to be adapted accordingly.
In this part, the following print types are used:
– requirements proper: in roman type;
– test specifications: in italic type;
– explanatory matter: in smaller roman type:
In the text of this part, the words in bold are defined in Clause 3.
Subclauses, notes, figures and tables additional to those in Part 1 are numbered starting from
101; supplementary annexes are entitled AA, BB, etc.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated
...