EN 61558-2-4:2009

SLOVENSKI STANDARD
01-januar-2010
1DGRPHãþD
SIST EN 61558-2-4:1999
9DUQRVWWUDQVIRUPDWRUMHYGXãLONQDSDMDOQLNRYLQSRGREQLKL]GHONRY]DQDSDMDOQH
QDSHWRVWLGR9GHO3RVHEQH]DKWHYHLQSUHVNXVL]DORþLOQH
WUDQVIRUPDWRUMHLQQDSDMDOQLNH]ORþLOQLPLWUDQVIRUPDWRUML,(&
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
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 accurate, IEC cannot be held responsible for the way in whic
...