SIST EN IEC 61558-1:2019

Safety of transformers, reactors, power supply units and combinations thereof - Part 1: General requirements and tests

NEW!IEC 61558-1:2017 is available as IEC 61558-1:2017 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 61558-1:2017 deals with safety aspects of transformers, reactors, power supply units and combinations thereof such as electrical, thermal and mechanical safety. This document covers the following independent or associated stationary or portable types of dry-type transformers, power supply units, including switch mode power supply units,  reactors and combinations thereof in the field of safety. The windings can be encapsulated or non-encapsulated. They are not forming a part of the distribution network. This third edition cancels and replaces the second edition published in 2005 and Amendment 1:2009. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a. fully insulated winding wires (FIW), new tables and aging tests for FIW constructions,
b. overvoltage categories 1, 2, 3 and 4 for clearances and dielectric strength tests (new tables) are included,
c. development of new symbols for the different overvoltage categories,
d. symbol for maximum altitudes, if higher than 2 000 m,
e. symbol for plug in power supply units, if the pins are damaged (tumbling barrel test),
f. symbol for minimum temperature (even during the transportation),
g. alternative temperature measurement, simulated load and back to back method according to IEC 60076-11,
h. short circuit and overload protection, simulated load and back to back method according to IEC 60076-11,
i. adjustment of temperatures in Table 2 according to CENELEC Guide 29,
j. establishing partial discharge test above 750 V for FIW constructions,
k. requirements for toroidal core constructions, division for basic and for supplementary isolation,
l. modification of protection indexes for enclosures (IP-code),
m. dimensioning of rectangular cross section connectors for transformers,
n. repetition test, 80% of required dielectric strength test voltage of Table 14,a.
o. vibration test for vehicles and railway applications,
p. two Y1 Capacitors for working voltages above 250 V and not exceeding 500 V with overvoltage category 3.
It has the status of a group safety publication in accordance with IEC Guide 104.

Sicherheit von Transformatoren, Netzgeräten, Drosseln und entsprechenden Kombinationen - Teil 1: Allgemeine Anforderungen und Prüfungen

Sécurité des transformateurs, bobines d’inductance, blocs d’alimentation et des combinaisons de ces éléments - Partie 1: Exigences générales et essais

NEW!IEC 61558-1:2017 est disponible sous forme de IEC 61558-1:2017 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC 61558-1:2017 traite des aspects relatifs à la sécurité des transformateurs, bobines d’inductance, blocs d’alimentation et des combinaisons de ces éléments, tels que la sécurité électrique, la sécurité thermique et la sécurité mécanique. Le présent document couvre les transformateurs de type sec, les blocs d’alimentation, y compris les blocs d’alimentation à découpage, les bobines d’inductance et les combinaisons de ces éléments, de type indépendant ou associé, fixe ou mobile, dans le domaine de la sécurité. Les enroulements peuvent être enrobés ou non enrobés. Ils ne constituent pas une partie du réseau de distribution. Cette troisième édition annule et remplace la deuxième édition parue en 2005 et l’Amendement 1:2009. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
a. fils de bobinage totalement isolés (FIW), nouveaux tableaux et essais de vieillissement pour les constructions avec fils FIW,
b. les catégories de surtensions 1, 2, 3 et 4 pour les distances d’isolement et les essais de rigidité diélectrique (nouveaux tableaux) sont incluses,
c. développement de nouveaux symboles pour les différentes catégories de surtensions,
d. symbole pour les altitudes maximales, si elles sont supérieures à 2 000 m,
e. symbole pour les blocs d’alimentation enfichables, si les broches sont endommagées (essai au tambour tournant),
f. symbole pour la température minimale (même durant le transport),
g. variante de mesure de la température, méthode de charge simulée et d’essai en opposition conformément à l’IEC 60076-11,
h. protection contre les courts-circuits et les surcharges, méthode de charge simulée et d’essai en opposition conformément à l’IEC 60076-11,
i. ajustement des températures dans le Tableau 2 conformément au Guide CENELEC 29,
j. établissement de l’essai de décharge partielle au-dessus de 750 V pour les constructions avec fils FIW,
k. exigences pour noyaux toroïdaux, division pour l’isolation principale et pour l’isolation supplémentaire,
l. modification des indices de protection pour les enveloppes (code IP),
m. dimensionnement des connecteurs de section rectangulaire pour transformateurs,
n. essai de répétition, 80 % de la tension d’essai de rigidité diélectrique requise dans le Tableau 14,
o. essai de vibrations pour les véhicules et les applications ferroviaires,
p. deux condensateurs Y1 pour des tensions locales supérieures à 250 V et ne dépassant pas 500 V avec la catégorie de surtension 3.
Elle a le statut d'une publication groupée de sécurité conformément au Guide IEC 104.

Varnost transformatorjev, reaktorjev, napajalnikov in kombinacij teh elementov - 1. del: Splošne zahteve in preskusi

General Information

• Status: Published
• Publication Date: 08-Aug-2019
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: I96 - Imaginarni 96
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 12-Jul-2019
• Due Date: 16-Sep-2019
• Completion Date: 09-Aug-2019
• 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
• Mandate: M/511 - Mandate to CEN, CENELEC and ETSI relating to harmonised standards in the field of the Low Voltage Directive
• Ref Project: EN IEC 61558-1:2019 - Safety of transformers, reactors, power supply units and combinations thereof - Part 1: General requirements and tests

Relations

• Revised: SIST EN 61558-1:2006 - Safety of power transformers, power supplies, reactors and similar products -- Part 1: General requirements and tests
• Effective Date: 10-May-2016
• Revised: SIST EN 61558-1:2006/A1:2009 - Safety of power transformers, power supplies, reactors and similar products -- Part 1: General requirements and tests
• Effective Date: 10-May-2016
• Replaces: SIST EN 61558-1:2006 - Safety of power transformers, power supplies, reactors and similar products -- Part 1: General requirements and tests
• Effective Date: 25-Jun-2019
• Replaces: SIST EN 61558-1:2006/A1:2009 - Safety of power transformers, power supplies, reactors and similar products -- Part 1: General requirements and tests
• Effective Date: 25-Jun-2019

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 61558-1:2019
01-september-2019
Nadomešča:
SIST EN 61558-1:2006
SIST EN 61558-1:2006/A1:2009
Varnost transformatorjev, reaktorjev, napajalnikov in kombinacij teh elementov - 1.
del: Splošne zahteve in preskusi
Safety of transformers, reactors, power supply units and combinations thereof - Part 1:
General requirements and tests
Ta slovenski standard je istoveten z: EN IEC 61558-1:2019
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
SIST EN IEC 61558-1:2019 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 61558-1:2019

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SIST EN IEC 61558-1:2019


EUROPEAN STANDARD EN IEC 61558-1

NORME EUROPÉENNE

EUROPÄISCHE NORM
June 2019
ICS 29.180 Supersedes EN 61558-1:2005
English Version
Safety of transformers, reactors, power supply units and
combinations thereof - Part 1: General requirements and tests
(IEC 61558-1:2017)
Sécurité des transformateurs, bobines d'inductance, blocs Sicherheit von Transformatoren, Netzgeräten, Drosseln und
d'alimentation et des combinaisons de ces éléments - entsprechenden Kombinationen - Teil 1: Allgemeine
Partie 1: Exigences générales et essais Anforderungen und Prüfungen
(IEC 61558-1:2017) (IEC 61558-1:2017)
This European Standard was approved by CENELEC on 2017-11-03. 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,
Turkey 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
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 61558-1:2019 E

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SIST EN IEC 61558-1:2019
EN IEC 61558-1:2019 (E)
European foreword
The text of document 96/466/FDIS, future edition 3 of IEC 61558-1, 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 IEC 61558-1:2019.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2019-12-21
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2022-06-21
document have to be withdrawn
This document supersedes EN 61558-1:2005.
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 has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s).
For the relationship with EU Directive(s) see informative Annex ZZ, which is an integral part of this
document.
Endorsement notice
The text of the International Standard IEC 61558-1:2017 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 60038:2009 NOTE Harmonized as EN 60038:2011
IEC 60051 (series) NOTE Harmonized as EN 60051-9:1989/A2 (series)
IEC 60317-43 NOTE Harmonized as EN 60317-43
IEC 60364-4-41:2005 NOTE Harmonized as HD 60364-4-41:2017
IEC 60584-1:2013 NOTE Harmonized as EN 60584-1:2013 (not modified)
IEC 60695-10-2:2014 NOTE Harmonized as EN 60695-10-2:2014 (not modified)
IEC 60738-1:2006 NOTE Harmonized as EN 60738-1:2006 (not modified)
IEC 60998-1:2002 NOTE Harmonized as EN 60998-1:2004
IEC 61000-3-2:2014 NOTE Harmonized as EN 61000-3-2:2014 (not modified)
IEC 61000-3-3:2013 NOTE Harmonized as EN 61000-3-3:2013 (not modified)
IEC 61180:2016 NOTE Harmonized as EN 61180:2016 (not modified)
IEC 61558-2 (series) NOTE Harmonized as EN 61558-2 (series)
IEC 61558-2-4 NOTE Harmonized as EN 61558-2-4
IEC 61558-2-6 NOTE Harmonized as EN 61558-2-6
IEC 61558-2-23 NOTE Harmonized as EN 61558-2-23
IEC 62041:2010 NOTE Harmonized as EN 62041:2010 (not modified)
CISPR 11:2015 NOTE Harmonized as EN 55011:2016
2

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SIST EN IEC 61558-1:2019
EN IEC 61558-1:2019 (E)
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.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60065201 4 Audio, video and similar electronic EN 60065 2014
(mod) apparatus - Safety requirements

- -  + A11 2017
IEC 60068-2-6 - Environmental testing - Part 2-6: EN 60068-2-6 2008
Tests - Test Fc: Vibration
(sinusoidal)
IEC 60068-2-14 - Environmental testing - Part 2-14: EN 60068-2-14 2009
Tests - Test N: Change of
temperature
IEC 60068-2-31 - Environmental testing - Part 2-31: EN 60068-2-31 2008
Tests - Test Ec: Rough handling
shocks, primarily for equipment-
type specimens
IEC 60068-2-75 - Environmental testing - Part 2-75: EN 60068-2-75 2014
Tests - Test Eh: Hammer tests
IEC 60076-1 - Power transformers - Part 1: EN 60076-1 2011
General
IEC 60076-11 2004 Power transformers -- Part 11: Dry- EN 60076-11 2004
type transformers
1
IEC/TR 60083 2015 Plugs and socket-outlets for - -
domestic and similar general use
standardized in member countries
of IEC
IEC 60085 2007 Electrical insulation - Thermal EN 60085 2008
evaluation and designation

1
Dated as no European equivalent exists.
3

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SIST EN IEC 61558-1:2019
EN IEC 61558-1:2019 (E)
Publication Year Title EN/HD Year
IEC 60112 2003 Method for the determination of the EN 60112 2003
proof and the comparative tracking
indices of solid insulating materials
IEC 60127 series Miniature fuses EN 60127 series
IEC 60127-3 - Miniature fuses - Part 3: Sub- EN 60127-3 2015
miniature fuse-links
IEC 60216 series Electrical insulating materials - EN 60216 series
Thermal endurance properties
IEC 60227 series Polyvinyl chloride insulated cables - -
of rated voltages up to and
including 450/750 V
IEC 60227-5 2011 Polyvinyl chloride insulated cables - -
of rated voltages up to and
including 450/750 V - Part 5:
Flexible cables (cords)
IEC 60245 series Rubber insulated cables - Rated - -
voltages up to and including
450/750 V -- Part 1: General
requirements
IEC 60245-4 2011 Rubber insulated cables - Rated - -
voltages up to and including
450/750 V - Part 4: Cords and
flexible cables
IEC 60269 series Low-voltage fuses EN 60269 series
IEC 60269-2 2013 Low-voltage fuses - Part 2: HD 60269-2 2013
(mod) Supplementary requirements for
fuses for use by authorized persons
(fuses mainly for industrial
application) - Examples of
standardized systems of fuses A to
K
IEC 60269-3 2010 Low-voltage fuses - Part 3: HD 60269-3 2010
(mod) Supplementary requirements for
fuses for use by unskilled persons
(fuses mainly for household or
similar applications) - Examples of
standardized systems of fuses A to
F
IEC 60309 series Plugs, socket-outlets and couplers EN 60309 series
for industrial purposes
IEC 60317 series Specifications for particular types of EN 60317 series
winding wires
4

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SIST EN IEC 61558-1:2019
EN IEC 61558-1:2019 (E)
Publication Year Title EN/HD Year
IEC 60317-0-7 2012 Specifications for particular types of EN 60317-0-7 2012
winding wires -- Part 0-7: General
requirements - Fully insulated (FIW)
zero-defect enamelled round
copper wire with nominal conductor
diameter of 0,040 mm to 1,600 mm
IEC 60317-56 - Specifications for particular types of EN 60317-56 2017
winding wires – Part 56: Solderable
fully insulated (FIW) zero-defect
polyurethane enamelled round
copper wire with nominal conductor
diameter 0,040 mm to 1,600 mm,
class 180
IEC 60320 series Appliance couplers for household EN 60320 series
and similar general purposes
1
IEC 60320-2-3 2018 Appliance couplers for household - -
and similar general purposes – Part
2-3: Appliance couplers with a
degree of protection higher than
IPX0
IEC 60384-14 2013 Fixed capacitors for use in EN 60384-14 2013
electronic equipment - Part 14:
Sectional specification - Fixed
capacitors for electromagnetic
interference suppression and
connection to the supply mains
1
IEC 60417 1973 Graphical symbols for use on - -
equipment. Index, survey and
compilation of the single sheets.
IEC 60454 series Specifications for pressure- EN 60454 series
sensitive adhesive tapes for
electrical purposes
IEC 60529 1989 Degrees of protection provided by EN 60529 1991
enclosures (IP Code)

- -  + corrigendum 1993
May

+ A1 1999 + A1 2000

+ A2 2013 + A2 2013
IEC 60664-1 2007 Insulation coordination for EN 60664-1 2007
equipment within low-voltage
systems - Part 1: Principles,
requirements and tests
5

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SIST EN IEC 61558-1:2019
EN IEC 61558-1:2019 (E)
Publication Year Title EN/HD Year
IEC 60664-3 2016 Insulation coordination for EN 60664-3 2017
equipment within low-voltage
systems - Part 3: Use of coating,
potting or moulding for protection
against pollution
IEC 60691 2015 Thermal-links - Requirements and EN 60691 2016
application guide
IEC 60695-2-10 2013 Fire hazard testing - Part 2-10: EN 60695-2-10 2013
Glowing/hot-wire based test
methods - Glow-wire apparatus and
common test procedure
IEC 60695-2-11 2014 Fire hazard testing - Part 2-11: EN 60695-2-11 2014
Glowing/hot-wire based test
methods - Glow-wire flammability
test method for end-products
(GWEPT)
IEC 60721-3-2 - Classification of environmental EN IEC 60721-2018
conditions – Part 3: Classification of3 -2
groups of environmental
parameters and their severities –
Section 2: Transportation
IEC 60730 series Automatic electrical controls EN 60730 series
IEC 60730-1 2013 Automatic electrical controls - Part EN 60730-1 2016
(mod) 1: General requirements
IEC 60851-3 2009 Winding wires - Test methods - Part EN 60851-3 2009
3: Mechanical properties
IEC 60851-5 2008 Winding wires - Test methods - Part EN 60851-5 2008
5: Electrical properties
IEC 60851-6 2012 Winding wires - Test methods - Part EN 60851-6 2012
6: Thermal properties
IEC 60884-1 2002 Plugs and socket-outlets for - -
household and similar purposes --
Part 1: General requirements

+ A1 2006 - -

+ A2 2013 - -
1
IEC 60884-2-4 2007  Plugs and socket-outlets for - -
household and similar purposes -
Part 2-4: Particular requirements for
plugs and socket-outlets for SELV
6

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SIST EN IEC 61558-1:2019
EN IEC 61558-1:2019 (E)
Publication Year Title EN/HD Year
IEC 60898 series Electrical accessories - Circuit- EN 60898 series
breakers for overcurrent protection
for household and similar
installations
1
IEC 60906-1 2009  IEC system of plugs and socket- - -
outlets for household and similar
purposes - Part 1: Plugs and
socket-outlets 16 A 250 V a.c.
1
IEC 60906-3 1994  IEC System of plugs and socket- - -
outlets for household and similar
purposes - Part 3: SELV plugs and
socket-outlets, 16 A 6V, 12 V, 24 V,
48 V, a.c. and d.c.
IEC 60947-7-1 - Low-voltage switchgear and EN 60947-7-1 2009
controlgear - Part 7-1: Ancillary
equipment - Terminal blocks for
copper conductors
IEC 60990 2016 Methods of measurement of touch EN 60990 2016
current and protective conductor
current
IEC 60998-2-1 - Connecting devices for low-voltage EN 60998-2-1 2004
(mod) circuits for household and similar
purposes - Part 2-1: Particular
requirements for connecting
devices as separate entities with
screw-type clamping units
IEC 60998-2-2 - Connecting devices for low-voltage EN 60998-2-2 2004
(mod) circuits for household and similar
purposes - Part 2-2: Particular
requirements for connecting
devices as separate entities with
screwless-type clamping units
IEC 60999-1 - Connecting devices - Electrical EN 60999-1 2000
copper conductors - Safety
requirements for screw-type and
screwless-type clamping units -
Part 1: General requirements and
particular requirements for clamping
units for conductors from 0,2 mm2
up to 35 mm2 (included)
IEC 61032 - Protection of persons and EN 61032 1998
equipment by enclosures - Probes
for verification
7

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SIST EN IEC 61558-1:2019
EN IEC 61558-1:2019 (E)
Publication Year Title EN/HD Year
IEC 61058-1 2016 Switches for appliances - Part 1: EN IEC 61058-1 2018
General requirements
IEC 61058-1-1 2016 Switches for appliances - Part 1-1: EN 61058-1-1 2016
Requirements for mechanical
switches

- -  EN 61058-1-1:
2016/AC:2019-
02
IEC 61140 2016 Protection against electric shock - EN 61140 2016
Common aspects for installation
and equipment
IEC 61373 - Railway applications - Rolling stock EN 61373 2010
equipment - Shock and vibration
tests
ISO 8820 series Road vehicles - Fuse-links - -
- - Specification for flat non-wirable EN 50075 1990
two-pole plugs 2.5 A 250 V, with
cord, for the connection of class II-
equipment for household and
similar purposes
DIN 43671 1975 Copper bus bars; design for - -
continuous current
DIN 43670 1975 Aluminium bus bars; design for - -
continuous current
DIN 43670-2 1985 Aluminium bus bars copper - -
cladding; design for continuous
current

8

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SIST EN IEC 61558-1:2019
EN IEC 61558-1:2019 (E)
Annex ZZ
(informative)

Relationship between this European standard and the safety
objectives of Directive 2014/35/EU [2014 OJ L96] aimed to be
covered
This European Standard has been prepared under a Commission’s standardization request relating to
harmonized standards in the field of the Low Voltage Directive, M/511, to provide one voluntary means
of conforming to safety objectives of Directive 2014/35/EU of the European Parliament and of the
Council of 26 February 2014 on the harmonization 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
[2014 OJ L96].
Once this standard is cited in the Official Journal of the European Union under that Directive,
compliance with the normative clauses of this standard given in Table ZZ.1 confers, within the limits of
the scope of this standard, a presumption of conformity with the corresponding safety objectives of
that Directive, and associated EFTA regulations.
For other hazards not covered by IEC 61558-1 (e.g. EMF functional safety linked to electric, magnetic
and electromagnetic disturbances) the manufacturer has to perform a risk assessment.
Table ZZ.1 – Correspondence between this European standard and Annex I of Directive
2014/35/EU [2014 OJ L96]
Safety objectives of Directive Clause(s) / sub- Remarks / Notes
2014/35/EU clause(s) of this
EN
1 General conditions
a)  the essential characteristics, the Clause 8
recognition and observance of which will
ensure that electrical equipment will be used
safely and in applications for which it was
made, shall be marked on the electrical
equipment, or, if this is not possible, on an
accompanying document
b) the electrical equipment, together with its Clauses 5; 8; 10; 20;
component parts, shall be made in such a 22; 23; 24;
way as to ensure that it can be safely and
25
properly assembled and connected
c) the electrical equipment shall be so Clauses 1; 3; 7; 13; See also Basic Protection
designed and manufactured as to ensure that 19 Requirements in points 2 and 3 in this
protection against the hazards set out in table
points 2 and 3 is assured, providing that the
equipment is used in applications for which it
was made and is adequately maintained
2 Protection against hazards arising from the electrical equipment
Measures of a technical nature shall be laid Clauses 4; 5; 7; 9;
down in accordance with point 1, in order to 17; 18; 19; 20;
ensure that:
21; 24; 26; Annex H
a)  persons and domestic animals are
adequately protected against the
danger of physical injury or other
harm which might be caused by
direct or indirect contact
9

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SIST EN IEC 61558-1:2019
EN IEC 61558-1:2019 (E)
Safety objectives of Directive Clause(s) / sub- Remarks / Notes
2014/35/EU clause(s) of this
EN
Measures of a technical nature shall be laid Clauses 4; 5; 14; 15;
down in accordance with point 1, in order to 18; 27
ensure that:
b) temperatures, arcs or radiation which
would cause a danger, are not
produced
Measures of a technical nature shall be laid Clauses 4; 5; 19;
down in accordance with point 1, in order to Annex H
ensure that:
c)  persons, domestic animals and
property are adequately protected
against non- electrical dangers
caused by the electrical equipment
which are revealed by experience
Measures of a technical nature shall be laid Clauses 4; 5; 17; 18;
down in accordance with point 1, in order to 19; 20; 26;
ensure that:
27
d)  the insulation is suitable for
foreseeable conditions
3 Protection against hazards which may be caused by external influences on the electrical equipment
Technical measures shall be laid down in Clauses 4; 5; 16; 22;
accordance with point 1, in order to ensure that 25; 28
the electrical equipment:
a)  meets the expected
mechanical requirements in such a
way that persons, domestic animals
and property are not endangered
Technical measures shall be laid down in Clauses 4; 5; 11; 12;
accordance with point 1, in order to ensure that 17; 24; 28
the electrical equipment:
b)  is resistant to non-
mechanical influences in expected
environmental conditions, in such a
way that persons, domestic
animals and property are not
endangered
Technical measures shall be laid down in Clause 4; 5; 15; 26;
accordance with point 1, in order to ensure that Annex H
the electrical equipment:
c)  does not endanger
persons, domestic animals and
property in foreseeable conditions of
overload
WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European
standard is maintained in the list published in the Official Journal of the European Union. Users of
this standard should consult frequently the latest list published in the Official Journal of the
European Union.
WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope
of this standard.
10

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SIST EN IEC 61558-1:2019



IEC 61558-1

®


Edition 3.0 2017-09




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE




GROUP SAFETY PUBLICATION

PUBLICATION GROUPÉE DE SÉCURITÉ






Safety of transformers, reactors, power supply units and combinations thereof –

Part 1: General requirements and tests




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

des combinaisons de ces éléments –

Partie 1: Exigences générales et essais















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 29.180 ISBN 978-2-8322-4750-1



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Marque déposée de la Commission Electrotechnique Internationale

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SIST EN IEC 61558-1:2019
– 2 – IEC 61558-1:2017 © IEC 2017
CONTENTS
FOREWORD . 9
INTRODUCTION . 11
1 Scope . 14
2 Normative references . 16
3 Terms and definitions . 19
3.1 Transformers . 20
3.2 General terms . 23
3.3 Operations and protections . 24
3.4 Circuits and windings . 26
3.5 Ratings . 27
3.6 No-load values . 29
3.7 Insulation . 29
3.8 Touch current and protective earthing conductor current . 33
4 General requirements . 33
5 General notes on tests . 34
6 Ratings . 36
7 Classification . 36
8 Marking and other information . 37
9 Protection against electric shock . 43
9.1 General . 43
9.2 Protection against contact with hazardous-live-parts . 44
9.2.1 Determination of hazardous-live-parts . 44
9.2.2 Accessibility to hazardous-live-parts . 44
9.2.3 Accessibility to non hazardous-live-part . 47
9.3 Protection against hazardous electrical discharge . 47
10 Change of input voltage setting . 47
11 Output voltage and output current under load . 48
12 No-load output voltage . 49
13 Short-circuit voltage . 49
14 Heating . 49
14.1 General requirements . 49
14.1.1 Temperature-rise test . 49
14.1.2 Alternative temperature-rise test . 51
14.1.3 Determination of steady-state conditions . 54
14.2 Application of 14.1 or 14.3 according to the insulation system. 55
14.3 Accelerated ageing test for undeclared class of insulation system . 56
14.3.1 General . 56
14.3.2 Heat run . 56
14.3.3 Vibration . 57
14.3.4 Moisture treatment . 57
14.3.5 Measurements . 57
15 Short circuit and overload protection. 57
15.1 General requirements . 57
15.1.1 Short circuit and overload test method . 57

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SIST EN IEC 61558-1:2019
IEC 61558-1:2017 © IEC 2017 – 3 –
15.1.2 Alternative short circuit and overload test method . 60
15.2 Inherently short-circuit proof transformers . 60
15.3 Non-inherently short-circuit proof transformers. 60
15.4 Non-short-circuit proof transformers . 61
15.5 Fail-safe transformers . 61
16 Mechanical strength . 62
16.1 General . 62
16.2 Stationary transformers . 62
16.3 Portable transformers (except portable transformers with integral pins for
introduction in socket-outlet in the fixed wiring) . 63
16.4 Portable transformers provided with integral pins for introduction in socket-
outlets of the fixed wiring . 63
16.4.1 General requirements . 63
16.4.2 Portable transformers provided with integral pins according to EN
50075 (IEC plug type C) for introduction in socket-outlets of the fixed
wiring . 64
16.5 Additional requirements for transformers to be used in vehicles and railway
applications . 65
16.5.1 Transformers to be used in vehicles and railway applications . 65
16.5.2 Test requirements for the transportation of transformers . 66
17 Protection against harmful ingress of dust, solid objects and moisture . 67
17.1 Degrees of protection provided by enclosures (IP code) . 67
17.1.1 General requirements . 67
17.1.2 Tests on transformers with enclosure . 68
17.2 Humidit
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