prEN IEC 61558-2-14:2021

SLOVENSKI STANDARD
01-julij-2021
Varnost transformatorjev, dušilk, napajalnikov in kombinacij teh elementov - 2-14.
del: Posebne zahteve in preskusi za spremenljive transformatorje in napajalnike z
vgrajenimi spremenljivimi transformatorji
Safety of transformers, reactors, power supply units and combinations thereof - Part 2-
14: Particular requirements and tests for variable transformers and power supply units
incorporating variable transformers for general applications
Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des
combinaisons de ces éléments - Partie 2-14: Exigences particulières et essais pour les
transformateurs variables et les blocs d'alimentation incorporant des transformateurs
variables
Ta slovenski standard je istoveten z: prEN IEC 61558-2-14:2021
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

96/507/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61558-2-14 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:

2021-04-30 2021-07-23
SUPERSEDES DOCUMENTS:
96/502/RR
IEC TC 96 : TRANSFORMERS, REACTORS, POWER SUPPLY UNITS, AND COMBINATIONS THEREOF
SECRETARIAT: SECRETARY:
Germany Mr Wolfgang Reichelt
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:

SC 3C,TC 14,TC 22,SC 22E,SC 34C,TC 51,TC
55,TC 61,SC 62A,TC 64,TC 66,TC 77,TC 97,TC
Other TC/SCs are requested to indicate their interest, if
106,TC 108,TC 109,TC 111,TC 112
any, in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.

TITLE:
Safety of transformers, reactors, power supply units and combinations thereof - Part 2-14:
Particular requirements and tests for variable transformers and power supply units
incorporating variable transformers for general applications

PROPOSED STABILITY DATE: 2025
NOTE FROM TC/SC OFFICERS:
download this electronic file, to make a copy and to print out the content for the sole purpose of preparing National
Committee positions. You may not copy or "mirror" the file or printed version of the document, or any part of it,
for any other purpose without permission in writing from IEC.

61558-2-14/Ed.2/CDV © IEC(E) 2 96/507/CDV

1 CONTENTS
2 FOREWORD. 3
3 INTRODUCTION . 5
4 1 Scope . 6
5 2 Normative references . 8
6 3 Terms and definitions . 8
7 4 General requirements . 9
8 5 General notes on tests . 9
9 6 Ratings . 9
10 7 Classification . 10
11 8 Marking and other information . 10
12 9 Protection against electric shock . 12
13 10 Change of input voltage setting . 13
14 11 Output voltage and output current under load . 13
15 12 No-load output voltage . 13
16 13 Short-circuit voltage . 15
17 14 Heating . 15
18 15 Short-circuit and overload protection . 16
19 16 Mechanical strength . 16
20 17 Protection against harmful ingress of dust, solid objects and moisture . 16
21 18 Insulation resistance, dielectric strength and leakage current . 16
22 19 Construction . 17
23 20 Components . 17
24 21 Internal wiring . 17
25 22 Supply connection and other external flexible cable or cords . 17
26 23 Terminals for external conductors . 17
27 24 Provisions for protective earthing . 17
28 25 Screws and connections . 17
29 26 Creepage distances, clearances and distances through insulation . 17
30 27 Resistance to heat, fire and tracking . 17
31 28 Resistance to rusting . 18
32 Annexes . 19
33 Bibliography . 20
35 Table 101 – Symbols indicating the kind of transformer . 11
36 Table 102 - – Output voltage ratio for auto-transformers, separating and safety
37 isolating transformers . 14
38 Table 103 – Output voltage ratio . 15
39 Table 104 - – Maximum permitted temperatures of the winding . 16
61558-2-14/Ed.2/CDV © IEC(E) 3 96/507/CDV

42 INTERNATIONAL ELECTROTECHNICAL COMMISSION
43 ____________
45 SAFETY OF TRANSFORMERS, REACTORS, POWER SUPPLY UNITS AND
46 COMBINATIONS THEREOF –
48 Part 2-14: Particular requirements and tests for variable transformers
49 and power supply units incorporating variable transformers
50 for general applications
52 FOREWORD
53 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
54 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
55 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
56 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
57 Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
58 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
59 may participate in this preparatory work. International, governmental and non-governmental organizations liaising
60 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
61 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
62 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
63 consensus of opinion on the relevant subjects since each technical committee has representation from all
64 interested IEC National Committees.
65 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
66 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
67 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
68 misinterpretation by any end user.
69 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
70 transparently to the maximum extent possible in their national and regional publications. Any divergence between
71 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
72 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
73 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
74 services carried out by independent certification bodies.
75 6) All users should ensure that they have the latest edition of this publication.
76 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
77 members of its technical committees and IEC National Committees for any personal injury, property damage or
78 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
79 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
80 Publications.
81 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
82 indispensable for the correct application of this publication.
83 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
84 rights. IEC shall not be held responsible for identifying any or all such patent rights.
86 International standard IEC 61558-2-14 has been prepared by IEC technical committee 96:
87 Transformers, reactors, power supply units and combinations thereof.
88 This second edition cancels and replaces the first edition published in 2012. This edition
89 constitutes a technical revision.
90 This edition includes the following significant technical changes with respect to the previous
91 edition:
92 a) Adjustment of structure and references in accordance with IEC 61558-1:2017;
93 b) Description of constructions moved to IEC 61558-1:2017;
94 c) New symbols for power supply units with linearly regulated output voltages and required
95 current collector position changes.

61558-2-14/Ed.2/CDV © IEC(E) 4 96/507/CDV

97 The text of this International Standard is based on the following documents:
Draft Report on voting
96/XXX/FDIS 96/XXX/RVD
99 Full information on the voting for its approval can be found in the report on voting indicated in
100 the above table.
101 The language used for the development of this International Standard is English.
102 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
103 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
104 at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
105 described in greater detail at www.iec.ch/standardsdev/publications.
106 It has the status of a group safety publication in accordance with IEC Guide 104.
107 This International Standard is to be used in conjunction with IEC 61558-1:2017.
108 NOTE When “Part 1” is mentioned in this standard, it refers to IEC 61558-1:2017.
109 This document supplements or modifies the corresponding clauses in IEC 61558-1:2017, so as
110 to convert that publication into the IEC standard: Particular requirements and tests for variable
111 transformers and power supply units incorporating variable transformers for general
112 applications.
113 A list of all parts in the IEC 61558 series published under the general title Safety of
114 transformers, reactors, power supply units and combinations thereof, can be found on the IEC
115 website.
116 Future standards in this series will carry the new general title as cited above. Titles of existing
117 standards in this series will be updated at the time of the next edition.
118 Where this document states "addition", "modification" or "replacement", the relevant text of
119 IEC 61558-1:2017 is to be adapted accordingly.
120 In this document, the following print types are used:
121 − requirements proper: in roman type;
122 − test specifications: in italic type;
123 − explanatory matter: in smaller roman type.
124 In the text of this document, the words in bold are defined in Clause 3.
125 Subclauses, notes, figures and tables additional to those in IEC 61558-1:2017 are numbered
126 starting from 101; supplementary annexes are entitled AA, BB, etc.
...