EN 61558-2-26:2013

SLOVENSKI STANDARD
01-februar-2014
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Safety of transformers, reactors, power supply units and combinations thereof - Part 2-
26: Particular requirements and tests for transformers and power supply units for saving
energy and other purposes
Sécurité des transformateurs, bobines d’inductance, blocs d’alimentation et des
combinaisons de ces éléments - Partie 2-26: Exigences particulières et essais pour les
transformateurs et les blocs d’alimentation destinés à l’économie d’énergie et à d’autres
fins
Ta slovenski standard je istoveten z: EN 61558-2-26:2013
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 61558-2-26
NORME EUROPÉENNE
September 2013
EUROPÄISCHE NORM
ICS 29.180
English version
Safety of transformers, reactors, power supply units and combinations
thereof -
Part 2-26: Particular requirements and tests for transformers and power
supply units for saving energy and other purposes
(IEC 61558-2-26:2013)
Sécurité des transformateurs, bobines Sicherheit von Transformatoren, Drosseln,
d’inductance, blocs d’alimentation et des Netzgeräten und deren Kombinationen -
combinaisons de ces éléments - Teil 2-26: Besondere Anforderungen und
Partie 2-26: Règles particulières et essais Prüfungen für Transformatoren und
pour les transformateurs et les blocs Netzgeräte zur Energieeinsparung sowie
d’alimentation entièrement destinés à für andere Zwecke
l’économie d’énergie et à d’autres fins (IEC 61558-2-26:2013)
(CEI 61558-2-26:2013)
This European Standard was approved by CENELEC on 2013-08-14. 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.

CENELEC
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

© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61558-2-26:2013 E
Foreword
The text of document 96/400/FDIS, future edition 1 of IEC 61558-2-26, 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 61558-2-26:2013.
The following dates are fixed:
(dop) 2014-05-14
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2016-08-14
standards conflicting with the

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 [and/or CEN] shall not be held responsible for identifying any or all such patent
rights.
This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment Designed
for Use within Certain Voltage Limits (LVD - 2006/95/EC).

Endorsement notice
The text of the International Standard IEC 61558-2-26:2013 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60076 series NOTE  Harmonised in EN 60079 series.
IEC 61558-2-1 NOTE  Harmonised as EN 61558-2-1.
IEC 61558-2-4 NOTE  Harmonised as EN 61558-2-4.
IEC 61558-2-6 NOTE  Harmonised as EN 61558-2-6.

- 3 - EN 61558-2-26:2013
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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Addition to the Annex ZA of EN 61558-1:2005:

Publication Year Title EN/HD Year

IEC 61558-1 2005 Safety of power transformers, power supplies, EN 61558-1 2005
+ corr. March 2008 reactors and similar products - + corr. August 2006
+ corr. March 2010 Part 1: General requirements and tests
+ corr. April 2011
IEC 61558-2-13 - Safety of transformers, reactors, power supply EN 61558-2-13 -
units and similar products for supply voltages
up to 1 100 V -
Part 2-13: Particular requirements and tests
for auto transformers and power supply units
incorporating auto transformers

IEC 61558-2-14 - Safety of transformers, reactors, power supply EN 61558-2-14 -
units and combinations thereof -
Part 2-14: Particular requirements and test for
variable transformers and power supply units
incorporating variable transformers

IEC 61558-2-16 - Safety of transformers, reactors, power supply EN 61558-2-16 -
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 61558-2-26 ®
Edition 1.0 2013-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Safety of transformers, reactors, power supply units and combinations thereof –

Part 2-26: Particular requirements and tests for transformers and power supply

units all for saving energy and other purposes

Sécurité des transformateurs, bobines d’inductance, blocs d’alimentation et des

combinaisons de ces éléments –

Partie 2-26: Règles particulières et essais pour les transformateurs et les blocs

d’alimentation entièrement destinés à l’économie d’énergie et à d’autres fins

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX R
ICS 29.180 ISBN 978-2-8322-0913-4

– 2 – 61558-2-26 © IEC:2013
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 6
3 Terms and definitions . 7
4 General requirements . 8
5 General notes on test . 8
6 Ratings . 9
7 Classification . 9
8 Marking and other information . 9
9 Protection against electric shock . 10
10 Change of input voltage setting . 11
11 Output voltage and output current under load . 11
12 No-load output voltage . 12
13 Short-circuit voltage . 12
14 Heating. 12
15 Short circuit and overload protection . 13
16 Mechanical strength . 13
17 Protection against harmful ingress of dust, solid objects and moisture . 13
18 Insulation resistance, dielectric strength and leakage current . 13
19 Construction . 13
20 Components . 15
21 Internal wiring . 15
22 Supply connection and other external flexible cables or cords . 15
23 Terminals for external conductors . 15
24 Provisions for protective earthing . 15
25 Screws and connections . 15
26 Creepage distances, clearances and distances through insulation . 15
27 Resistance to heat, fire and tracking . 15
28 Resistance to rusting . 15
Annexes . 16
Annex B (normative) Testing a series of transformers . 16
Annex L (normative) Routine tests (production test) . 16
Annex AA (informative) Saving energy . 17
Annex BB (informative) Incorporated transformers . 18
Bibliography . 19

Table 101 – Output voltage difference . 12

61558-2-26 © IEC:2013 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY OF TRANSFORMERS, REACTORS,
POWER SUPPLY UNITS AND COMBINATIONS THEREOF –

Part 2-26: Particular requirements and tests for transformers and
power supply units all for saving energy and other purposes

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.
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
...