Safety of transformers, reactors, power supply units and combinations thereof - Part 2-8: Particular requirements and tests for transformers and power supply units for bells and chimes

Sicherheit von Transformatoren, Drosseln, Netzgeräten und entsprechenden Kombinationen - Teil 2-8: Besondere Anforderungen und Prüfungen an Transformatoren und Netzgeräten für Klingeln und Läutewerke

Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des combinaisons de ces éléments - Partie 2-8: Règles particulières et essais pour les transformateurs et blocs d'alimentation pour sonneries et carillons

Varnost transformatorjev, dušilk, napajalnikov in kombinacij teh elementov - 2-8. del: Posebne zahteve in preskusi za transformatorje in napajalnike za zvonce in gonge

General Information

Status
Not Published
Public Enquiry End Date
02-Mar-2023
Technical Committee
Current Stage
4020 - Public enquire (PE) (Adopted Project)
Start Date
11-Jan-2023
Due Date
31-May-2023
Completion Date
19-Apr-2023

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SLOVENSKI STANDARD
oSIST prEN IEC 61558-2-8:2023
01-februar-2023
Varnost transformatorjev, dušilk, napajalnikov in kombinacij teh elementov - 2-8.
del: Posebne zahteve in preskusi za transformatorje in napajalnike za zvonce in
gonge
Safety of transformers, reactors, power supply units and combinations thereof - Part 2-8:
Particular requirements and tests for transformers and power supply units for bells and
chimes
Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des
combinaisons de ces éléments - Partie 2-8: Règles particulières et essais pour les
transformateurs et blocs d'alimentation pour sonneries et carillons
Ta slovenski standard je istoveten z: prEN IEC 61558-2-8:2023
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
oSIST prEN IEC 61558-2-8:2023 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN IEC 61558-2-8:2023

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96/565/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:

IEC 61558-2-8 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:

2023-01-06 2023-03-31
SUPERSEDES DOCUMENTS:

96/562/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:


Other TC/SCs are requested to indicate their interest, if
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 2-8:
Particular requirements and tests for transformers and power supply units for bells and
chimes

PROPOSED STABILITY DATE: 2025

NOTE FROM TC/SC OFFICERS:


Copyright © 2022 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to
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.

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

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39 INTERNATIONAL ELECTROTECHNICAL COMMISSION
40 ____________
41
42 SAFETY OF TRANSFORMERS, REACTORS,
43 POWER SUPPLY UNITS AND COMBINATIONS THEREOF –
44
45 Part 2-8: Particular requirements and tests for transformers
46 and power supply units for bells and chimes
47
48
49 FOREWORD
50 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
51 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
52 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
53 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
54 Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
55 preparation is entrusted to technical committees; any IEC National Committee interested in the s ubject dealt with
56 may participate in this preparatory work. International, governmental and non-governmental organizations liaising
57 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
58 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
59 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
60 consensus of opinion on the relevant subjects since each technical committee has representation from all
61 interested IEC National Committees.
62 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
63 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
64 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
65 misinterpretation by any end user.
66 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
67 transparently to the maximum extent possible in their national and regional publications. Any divergence between
68 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
69 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
70 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
71 services carried out by independent certification bodies.
72 6) All users should ensure that they have the latest edition of this publication.
73 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
74 members of its technical committees and IEC National Committees for any personal injury, property damage or
75 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
76 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
77 Publications.
78 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
79 indispensable for the correct application of this publication.
80 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
81 rights. IEC shall not be held responsible for identifying any or all such patent rights.
82 International standard IEC 61558-2-8 has been prepared by IEC technical committee 96:
83 Transformers, reactors, power supply units and combinations thereof.
84 This third edition cancels and replaces the second edition published in 2010. This edition
85 constitutes a technical revision.
86 This edition includes the following significant technical changes with respect to the previous
87 edition:
88 a) adjustment of structure and references in accordance with IEC 61558-1:2017;
89 b) new symbol for power supply unit with linearly regulated output voltage.
90
91

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92 The text of this document is based on the following documents:
Draft Report on voting
96/XXX/FDIS 96/XXX/RVD
93
94 Full information on the voting for its approval can be found in the report on voting indicated in
95 the above table.
96 The language used for the development of this document is English.
97 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
98 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
99 at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
100 described in greater detail at www.iec.ch/standardsdev/publications.
101 It has the status of a group safety publication in accordance with IEC Guide 104.
102 This document is to be used in conjunction with IEC 61558-1:2017.
103 This document supplements or modifies the corresponding clauses in IEC 61558-1:2017, so as
104 to convert that publication into the IEC standard: Particular requirements and tests for
105 transformers and power supply units for bells and chimes.
106 A list of all parts in the IEC 61558 series published under the general title Safety of transformers,
107 reactors, power supply units and combinations thereof, can be found on the IEC website.
108 Future standards in this series will carry the new general title as cited above. Titles of existing
109 standards in this series will be updated at the time of the next edition.
110 Where this document states "addition", "modification" or "replacement", the relevant text of
111 IEC 61558-1:2017 is to be adopted accordingly.
112 In this document, the following print types are used:
113 − requirements proper: in roman type;
114 − test specifications: in italic type;
115 − explanatory matter: in smaller roman type.
116 In the text of this document, the words in bold are defined in Clause 3.
117 Subclauses, notes, figures and tables additional to those in IEC 61558-1:2017 are numbered
118 starting from 101; supplementary annexes are entitled AA, BB, etc.
119 The committee has decided that the contents of this document will remain unchanged until the
120 stability date indicated on the IEC website under www.webstore.iec.ch in the data related to the
121 specific document. At this date, the document will be
122 • reconfirmed,
123 • withdrawn,
124 • replaced by a revised edition, or
125 • amended.
126

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127 INTRODUCTION
128 IEC TC 96 has a group safety function in accordance with IEC Guide 104 for transformers other
129 than those intended to supply distribution networks, in particular transformers and power supply
130 units intended to allow the application of protective measures against electric shock as defined
131 by TC 64, but in certain cases including the limitation of voltage and horizontal safety function
132 for SELV, in accordance with IEC 60364-4-41.
133 The group safety function (GSF) is used because of responsibility for example for safety extra-
134 low voltage (SELV) in accordance with IEC 61140:2016, 5.2.6 and IEC 60364-4-41:2005,
135 414.3.1 or control circuits in accordance with IEC 60204-1:2016, 7.2.4.
136 The group safety function is used for each part of IEC 61558-2 because different standards of
137 the IEC 61558 series can be combined in one construction but in certain cases with no limitation
138 of rated output power.
139 For example an auto-transformer in accordance with IEC 61558-2-13 can be designed with a
140 separate SELV-circuit in accordance with the particular requirements for IEC 61558-2-6 relating
141 to the general requirements of IEC 61558-1.
142

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143 SAFETY OF TRANSFORMERS, REACTORS,
144 POWER SUPPLY UNITS AND COMBINATIONS THEREOF –
145
146 Part 2-8: Particular requirements and tests for transformers
147 and power supply units for bells and chimes
148
149
150 1 Scope
151 Replacement
152 This part of IEC 61558 deals with the safety of bell and chime transformers and power supply
153 units incorporating bell and chime transformers. Transformers incorporating electronic
154 circuits are also covered by this document.
155 NOTE 1 Safety includes electrical, thermal and mechanical aspects.
156 Unless otherwise specified, from here onward, the term transformer covers bell and chime
157 transformers and power supply units incorporating bell and chime transformers.
158 For power supply units (linear) this document is applicable. For switch mode power supply
159 units IEC 61558-2-16 is applicable together with this document. Where two requirements are
160 in conflict, the most severe take precedence.
161 This document is applicable to stationary, single-phase, air-cooled (natural or forced)
162 independent or associated dry-type transformers. The windings can be encapsulated or non-
163 encapsulated.
164 The rated supply voltage does not exceed 250 V AC and the rated supply frequency and the
165 internal operating frequencies do not exceed 500 Hz.
166 The rated output does not exceed 100 VA.
167 The no-load output voltage does not exceed 33 V AC or 46 V ripple-free DC, and the rated
168 output voltage does not exceed 24 V AC, or 33 V ripple-free DC.
169 Bell and chime transformers are generally intended to supply domestic sound signalling
170 equipment and other similar devices where the load is applied for short periods of time.
171 NOTE 2 A partial load can be applied for illumination purposes.
172 This document is not applicable to external circuits and their components intended to be
173 connected to the input terminals and output terminals of the transformers.
174 NOTE 3 Transformers covered by this document are only used in applications where double or reinforced
175 insulation between circuits is required by the installation rules or by the end product standard .
176 NOTE 4 Normally the transformers are intended to be used with equipment to provide voltages different from the
177 supply voltage for the functional requirements of the equipment. The protection against electric shock can be provided
178 or completed by other features of the equipment, such as the body. Parts of output circuits can be connected to
179 the input circuits or to protective earthing.
180

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181 This document is applicable to transformers associated with specific equipment, to the extent
182 decided upon by the relevant IEC technical committees.
183 Attention is drawn to the following, if necessary:
184 − measures to protect the enclosure and the components inside the enclosure against
185 external influences such as fungus, vermin, termites, solar-radiation, and icing;
186 − the different conditions for transportation, storage, and operation of the transformers;
187 − additional requirements in accordance with other appropriate standards and national
188 rules can be applicable to transformers intended for use in special environments.
189 Future technological development of transformers can necessitate a need to increase the
190 upper limit of the frequencies. Until then this document can be used as a guidance document.
191 This group safety publication focusing on safety guidance is primarily intended to be used as a
192 product safety standard for the products mentioned in the scope but is also intended to be used
193 by technical committees in the preparation of publicati
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