SIST EN 61558-2-10:2014

Safety of transformers, reactors, power supply units and combinations thereof - Part 2-10: Particular requirements and tests for separating transformers with high insulation level and separating transformers with output voltages exceeding 1000 V

IEC 61558-2-10:2014 deals with the safety of separating transformers with high insulation level and separating transformers with output voltages exceeding 1 000 V. Transformers incorporating electronic circuits are also covered by this standard. This first edition cancels and replaces Chapter ll Section Three of IEC 60989 published in 1991. It constitutes a technical revision. The main changes consist of   a) updating this part in accordance with IEC 61558-1:2005, and  b) adding power supply units to the scope. The attention of National Committees is drawn to the fact that equipment manufacturers and testing organizations may need a transitional period following publication of a new, amended or revised IEC publication in which to make products in accordance with the new requirements and to equip themselves for conducting new or revised tests. 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. The transitional period is not longer than 3 years after the publication of this standard.

/

Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des combinaisons de ces éléments - Partie 2-10: Exigences et essais particuliers pour les transformateurs de séparation à niveau d'isolement élevé et pour les transformateurs de séparation à tensions secondaires supérieures à 1 000 V

L'IEC 61558-2-10:2014 traite de la sécurité des transformateurs d'isolement à enroulements séparés à niveau d'isolement élevé et des transformateurs d'isolement à enroulements séparés à tensions secondaires supérieures à 1 000 V. Les transformateurs incorporant des circuits électroniques sont également couverts par la présente norme. La présente première édition annule et remplace le Chapitre ll Section trois de l'IEC 60989 publiée en 1991. Elle constitue une révision technique. Les principales modifications consistent en  a) la mise à jour de la présente partie, conformément à l'IEC 61558-1:2005, et   b) l'ajout des blocs d'alimentation dans le domaine d'application. L'attention des Comités nationaux est attirée sur le fait que les fabricants d'appareils et les organismes d'essai peuvent avoir besoin d'une période transitoire après la publication d'une nouvelle publication IEC, ou d'une publication amendée ou révisée, pour fabriquer des produits conformes aux nouvelles exigences et pour adapter leurs équipements aux nouveaux essais ou aux essais révisés. Le comité recommande que le contenu de cette publication soit entériné au niveau national au plus tôt 12 mois après la date de publication. La période transitoire ne dépasse pas 3 ans après la publication de la présente norme.

Varnost transformatorjev, dušilk, napajalnikov in njihovih kombinacij - 2-10. del: Posebne zahteve in preskusi za ločilne transformatorje z visoko izolacijsko stopnjo in ločilne transformatorje z izhodnimi napetostmi nad 1000 V (IEC 61558-2-10:2014)

Standard EN IEC 61558-2-10 obravnava varnost ločilnih transformatorjev z visoko izolacijsko stopnjo in ločilnih transformatorjev z izhodnimi napetostmi nad 1000 V. V tem standardu so obravnavani tudi transformatorji z vgrajenimi elektronskimi vezji. Če ni navedeno drugače, izraz transformator v nadaljevanju zajema ločilne transformatorje z visoko izolacijsko stopnjo in ločilne transformatorje z izhodnimi napetostmi nad 1000 V izmeničnega napajanja ali 1500 V enosmernega napajanja. 2-10. del velja za stacionarne ali prenosne, eno- ali večfazne, zračno hlajene (naravno ali umetno) neodvisne ali povezane suhe transformatorje. Navitja so lahko enkapsulirana ali neenkapsulirana. Ta standard velja za transformatorje in napajalnike (linearne) z notranjimi operativnimi frekvencami do 500 Hz. Ta standard, uporabljen skupaj z 2. do 16. delom za stikalne napajalnike (SMPS), prav tako velja za napajalnike z notranjimi operativnimi frekvencami, ki presegajo 500 Hz. Če sta zahtevi v nasprotju ena z drugo, prevlada natančnejša. Nazivna napajalna napetost ne presega 1000 V izmeničnega napajanja, nazivna napajalna frekvenca in notranja obratovalna frekvenca pa ne presegata 500 Hz. Nazivna napajalna napetost ne presega 1000 V izmeničnega napajanja, nazivna napajalna frekvenca in notranja obratovalna frekvenca pa ne presegata 500 Hz. Nazivna izhodna moč ne preseže: – 25 kVA za enofazne transformatorje; – 40 kVA za večfazne transformatorje. 2-10. del velja za transformatorje brez omejitev nazivne izhodne moči, o čemer se dogovorita kupec in proizvajalec. Kjer je to primerno, izhodna napetost brez obremenitve ali nazivna izhodna napetost: – ne presega 1000 V izmeničnega napajanja ali 1500 V enosmernega napajanja za ločilne transformatorje z visoko izolacijsko stopnjo; – presega 1000 V izmeničnega napajanja ali 1500 V enosmernega napajanja ter ne presega 15.000 V izmeničnega napajanja ali 15.000 V enosmernega napajanja za ločilne transformatorje z izhodnimi napetostmi nad 1000 V. 2-10. del se ne uporablja za: – transformatorje iz standarda IEC 60076-11; – neonske transformatorje iz standarda IEC 61050 ter – napajalnike in pretvornike za uporabo z izdelki ali v izdelkih v skladu s standardom IEC 61347-2-10. 2-10. del ne velja za zunanja vezja in njihove sestavne dele, ki so namenjeni za povezavo z vhodnimi in izhodnimi priključki transformatorjev. V 2-10. delu obravnavani transformatorji se uporabljajo samo, kjer v skladu s pravili namestitve ali standardom končnega izdelka ni potrebna dvojna ali okrepljena izolacija med vezji.

General Information

• Status: Published
• Publication Date: 12-Aug-2014
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: I96 - Imaginarni 96
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 14-Jul-2014
• Due Date: 18-Sep-2014
• Completion Date: 13-Aug-2014
• Ref Project: EN 61558-2-10:2014 - Safety of transformers, reactors, power supply units and combinations thereof - Part 2-10: Particular requirements and tests for separating transformers with high insulation level and separating transformers with output voltages exceeding 1 000 V

Relations

• Revises: SIST EN IEC 61558-2-10:2024 - Safety of transformers, reactors, power supply units and combinations thereof - Part 2-10: Particular requirements and tests for separating transformers with high insulation level and separating transformers with output voltages exceeding 1 000 V
• Effective Date: 01-Oct-2024

Overview

EN 61558-2-10:2014 (IEC 61558-2-10:2014) is the European/CENELEC adoption of the IEC standard that defines particular safety requirements and tests for separating transformers with high insulation level and for separating transformers with output voltages exceeding 1 000 V. It covers transformers that incorporate electronic circuits and extends the scope to include power supply units. This Part 2-10 is intended to be used together with EN/IEC 61558-1 (general requirements and tests) and replaces earlier Chapter II Section Three of IEC 60989 (1991).

Key topics and requirements

EN 61558-2-10 supplements and modifies EN/IEC 61558-1 to address high-voltage and high-insulation separating transformers. Major technical topics include:

• Insulation, dielectric strength and leakage current - specific requirements and test procedures for high insulation levels.
• Creepage and clearance distances - requirements for safe spacing through and over insulation for high secondary voltages.
• Marking, ratings and output characteristics - information required on nameplates and documentation for devices with secondary voltages >1 000 V.
• Protection against electric shock - construction and testing measures to limit risk from high-voltage outputs.
• Heating, short-circuit and overload protection - thermal limits and protective provisions for windings and components.
• Mechanical strength and construction - structural requirements for safe operation and mounting.
• Ingress protection, internal wiring and components - requirements for durability, wiring integrity and component selection in high-voltage environments.
• Test specifications - normative tests (dielectric tests, heating tests, mechanical tests) and additional annexes that supplement Part 1’s procedures.

(Note: use EN/IEC 61558-1 alongside this part for full test and design rules.)

Practical applications

EN 61558-2-10 is directly applicable to the design, manufacture and testing of:

• Separating (isolation) transformers with high insulation levels or secondary voltages above 1 000 V.
• Power supply units that include isolated high-voltage outputs or embedded isolating transformers.
• Reactors and assemblies where isolation and high secondary voltages present specific safety concerns.

Typical use cases include high-voltage control systems, industrial power equipment, and specialized power-conversion devices where robust isolation and safety verification are required.

Who should use this standard

• Transformer and power-supply design engineers
• Manufacturers producing isolating transformers or high-voltage power supplies
• Test laboratories and conformity assessment bodies performing safety tests
• Certification and compliance teams preparing technical files for CE marking or national implementation
• Procurement and safety managers specifying high-voltage isolation components

Related standards

• EN/IEC 61558-1 (General requirements and tests) - mandatory companion document
• Earlier reference: IEC 60989 (superseded chapter)
• Other parts of the 61558 series covering switch-mode supplies and additional product classes (see IEC/EN 61558 series)

Note: CENELEC recommended a transitional period for national adoption (not earlier than 12 months and not longer than 3 years from publication).

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2014
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3RVHEQH]DKWHYHLQSUHVNXVL]DORþLOQHWUDQVIRUPDWRUMH]YLVRNRL]RODFLMVNR
VWRSQMRLQORþLOQHWUDQVIRUPDWRUMH]L]KRGQLPLQDSHWRVWPLQDG9,(&

Safety of transformers, reactors, power supply units and combinations thereof - Part 2-
10: Particular requirements and tests for separating transformers with high insulation
level and separating transformers with output voltages exceeding 1000 V
/
Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des
combinaisons de ces éléments - Partie 2-10: Exigences et essais particuliers pour les
transformateurs de séparation à niveau d'isolement élevé et pour les transformateurs de
séparation à tensions secondaires supérieures à 1 000 V
Ta slovenski standard je istoveten z: EN 61558-2-10:2014
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 61558-2-10

NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2014
ICS 29.180
English Version
Safety of transformers, reactors, power supply units and
combinations thereof - Part 2-10: Particular requirements and
tests for separating transformers with high insulation level and
separating transformers with output voltages exceeding 1 000 V
(IEC 61558-2-10:2014)
Sécurité des transformateurs, bobines d'inductance, blocs Sicherheit von Transformatoren, Netzgeräten, Drosseln und
d'alimentation et des combinaisons de ces éléments - dergleichen - Teil 2-10: Besondere Anforderungen und
Partie 2-10: Règles particulières et essais pour les Prüfungen an Netztransformatoren mit hohem
transformateurs d'isolement à enroulements séparés à Isolationspegel und Netztransformatoren mit
niveau d'isolement élevé et pour les transformateurs Ausgangsspannungen über 1 000 V
d'isolement à enroulements séparés à tensions secondaires (IEC 61558-2-10:2014)
supérieures à 1 000 V
(CEI 61558-2-10:2014)
This European Standard was approved by CENELEC on 2014-05-15. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61558-2-10:2014 E
Foreword
The text of document 96/407/FDIS, future IEC 61558-2-10, prepared by IEC/TC 96, "Transformers,
reactors, power supply units and combinations thereof" was submitted to the IEC-CENELEC parallel
vote and approved by CENELEC as EN 61558-2-10:2014.
The following dates are fixed:
(dop) 2015-02-15
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2017-05-15
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This Part 2-10 is intended to be used in conjunction with the latest edition of EN 61558-1 and its
amendments.
This Part 2-10 supplements or modifies the corresponding clauses in EN 61558-1, so as to convert
that publication into the IEC standard: Particular requirements and tests for separating transformers
with high insulation level and separating transformers with output voltages exceeding 1 000 V.
When 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 adopted accordingly.
In this part, the following print types are used:
− requirements proper: in roman type;
− test specifications: in italic type;
− explanatory matters: 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.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 61558-2-10:2014 was approved by CENELEC as a
European Standard without any modification.
In the Bibliography of EN 61558-1:2005, the following note has to be added for the standard indicated:
Addition:
IEC 60076-11 NOTE Harmonised as EN 60076-11 (not modified).
IEC 61050 NOTE Harmonised as EN 61050 (modified).
IEC 61347-2-10:2000 NOTE Harmonised as EN 61347-2-10:2001 (not modified).

- 3 - EN 61558-2-10:2014
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When 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.cenelec.eu
Annex ZA of EN 61558-1:2005 applies, except as follows:
Publication Year Title EN/HD Year
IEC 61558-1 2005 Safety of power transformers, power EN 61558-1 2005
supplies, reactors and similar products --
Part 1: General requirements and tests
+EN 61558- 2006
1:2005/corrigendum
Aug. 2006
IEC 61558-2-16 -  Safety of transformers, reactors, power EN 61558-2-16 -
supply units and similar products for
voltages up to 1 100 V -- Part 2-16:
Particular requirements and tests for switch
mode power supply units and transformers
for switch mode power supply units

IEC 61558-2-10 ®
Edition 1.0 2014-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Safety of transformers, reactors, power supply units and combinations thereof –

Part 2-10: Particular requirements and tests for separating transformers with

high insulation level and separating transformers with output voltages

exceeding 1 000 V
Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des

combinaisons de ces éléments –

Partie 2-10: Règles particulières et essais pour les transformateurs d'isolement

à enroulements séparés à niveau d'isolement élevé et pour les transformateurs

d'isolement à enroulements séparés à tensions secondaires supérieures

à 1 000 V
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX Q
ICS 29.180 ISBN 978-2-8322-1513-5

– 2 – IEC 61558-2-10:2014 © IEC 2014
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 6
3 Terms and definitions . 6
4 General requirements . 7
5 General notes on tests . 7
6 Ratings . 7
7 Classification . 8
8 Marking and other information . 8
9 Protection against electric shock . 10
10 Change of input voltage setting . 10
11 Output voltage and output current under load . 10
12 No-load output voltage . 10
13 Short-circuit voltage . 11
14 Heating . 11
15 Short-circuit and overload protection . 11
16 Mechanical strength . 11
17 Protection against harmful ingress of dust, solid objects and moisture . 11
18 Insulation resistance, dielectric strength and leakage current . 11
19 Construction . 12
20 Components . 13
21 Internal wiring . 13
22 Supply connection and other external flexible cable or cords . 13
23 Terminals for external conductors . 13
24 Provisions for protective earthing . 13
25 Screws and connections . 13
26 Creepage distances, clearances and distances through insulation . 13
27 Resistance to heat, fire and tracking . 15
28 Resistance to rusting . 15
Annexes . 15

Table 101 – Output voltage difference . 11
Table 102 – Table of dielectric strength test voltages . 12
Table 103 – Clearances distances for homogenous fields and inhomogeneous fields . 14
Table 104 – Creepage distances for material group III a, II and I (CTI > 175) for basic
or supplementary insulation . 15

IEC 61558-2-10:2014 © IEC 2014 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY OF TRANSFORMERS, REACTORS, POWER
SUPPLY UNITS AND COMBINATIONS THEREOF –

Part 2-10: Particular requirements and tests for separating
transformers with high insulation level and separating
transformers with output voltages exceeding 1 000 V

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,
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with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
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
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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 61558-2-10 has been prepared by IEC technical committee 96:
Transformers, reactors, power supply units, and combinations thereof.
This first edition cancels and replaces Chapter ll Section Three of IEC 60989 published in
1991.
It constitutes a technical revision. The main changes consist of
a) updating this part in accordance with IEC 61558-1:2005, and
b) adding power supply units to the scope.

– 4 – IEC 61558-2-10:2014 © IEC 2014
The text of this standard is based on the following documents:
FDIS Report on voting
96/407/FDIS 96/408/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 2-10 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 and its
Amendement 1 (2009).
This Part 2-10 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 separating
transformers with high insulation level and separating transformers with output voltages
exceeding 1 000 V.
A list of all parts of the IEC 61558 series, under the general title: Safety of transformers,
reactors, power supply units and combinations thereof, can be found on the IEC website.
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.
When 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 adopted accordingly.
In this part, the following print types are used:
− requirements proper: in roman type;
− test specifications: in italic type;
− explanatory matters: 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
stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to
the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
NOTE The attention of National Committees is drawn to the fact that equipment manufacturers and testing
organizations may need a transitional period following publication of a new, amended or revised IEC publication in
which to make products in accordance with the new requirements and to equip themselves for conducting new or
revised tests.
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.
The transitional period is not longer than 3 years after the publication of this standard.

IEC 61558-2-10:2014 © IEC 2014 – 5 –
SAFETY OF TRANSFORMERS, REACTORS, POWER
SUPPLY UNITS AND COMBINATIONS THEREOF –

Part 2-10: Particular requirements and tests for separating
transformers with high insulation level and separating
transformers with output voltages exceeding 1 000 V

1 Scope
Replacement:
This part of IEC 61558 deals with the safety of separating transformers with high insulation
level and separating transformers with output voltages exceeding 1 000 V. Transformers
incorporating electronic circuits are also covered by this standard.
NOTE 1 Safety includes electrical,
...