EN 61858:2008

SLOVENSKI STANDARD
01-december-2008
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Electrical insulation systems - Thermal evaluation of modifications to an established wire-
wound EIS (IEC 61858:2008)
Elektrische Isoliersysteme - Thermische Bewertung von Veränderungen an einem
erprobten, drahtgewickelten EIS (IEC 61858:2008)
Systèmes d’isolation électrique - Evaluation thermique des modifications apportées à un
système d’isolation électrique éprouvé à enroulements à fil (CEI 61858:2008)
Ta slovenski standard je istoveten z: EN 61858:2008
ICS:
29.080.30 Izolacijski sistemi Insulation systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 61858
NORME EUROPÉENNE
October 2008
EUROPÄISCHE NORM
ICS 29.080.30 Supersedes EN 61858:2005

English version
Electrical insulation systems -
Thermal evaluation of modifications to an established wire-wound EIS
(IEC 61858:2008)
Systèmes d’isolation électriques -  Elektrische Isoliersysteme -
Evaluation thermique des modifications Thermische Bewertung
apportées à un système d’isolation von Veränderungen an einem erprobten,
électrique éprouvé à enroulements à fil drahtgewickelten EIS
(CEI 61858:2008) (IEC 61858:2008)

This European Standard was approved by CENELEC on 2008-09-01. 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: rue de Stassart 35, B - 1050 Brussels

© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61858:2008 E
Foreword
The text of document 112/90/CDV, future edition 3 of IEC 61858, prepared by IEC TC 112, Evaluation
and qualification of electrical insulating materials and systems, was submitted to the IEC-CENELEC
parallel vote and was approved by CENELEC as EN 61858 on 2008-09-01.
This European Standard supersedes EN 61858:2005.
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) 2009-06-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2011-09-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61858:2008 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 60317-24 NOTE  Harmonized as EN 60317-24:1995 (not modified).
__________
- 3 - EN 61858:2008
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

IEC 60085 2007 Electrical insulation - Thermal evaluation and EN 60085 2008
designation
1) 2)
IEC 60172 - Test procedure for the determination of the EN 60172 1994
temperature index of enamelled winding wires

1) 2)
IEC 60216-5 - Electrical insulating materials - Thermal EN 60216-5 2008
endurance properties -
Part 5: Determination of relative thermal
endurance index (RTE) of an insulating
material
1)
IEC 60317-3 - Specifications for particular types of winding - -
wires -
Part 3: Polyester enamelled round copper
wire, class 155
1) 2)
IEC 60317-4 - Specifications for particular types of winding EN 60317-4 1994
wires -
Part 4: Solderable polyurethane enamelled
round copper wire, class 130
1) 2)
IEC 60317-7 - Specifications for particular types of winding HD 555.7 S2 1992
wires -
Part 7: Polyimide enamelled round copper
wire, class 220
1) 2)
IEC 60317-8 - Specifications for particular types of winding EN 60317-8 1994
wires -
Part 8: Polyesterimide enamelled round
copper wire, class 180
1) 2)
IEC 60317-13 - Specifications for particular types of winding EN 60317-13 1994
wires -
Part 13: Polyester or polyesterimide
overcoated with polyamide-imide enamelled
round copper wire, class 200
1) 2)
IEC 60317-15 - Specifications for particular types of winding EN 60317-15 2004
wires -
Part 15: Polyesterimide enamelled round
aluminium wire, class 180
1) 2)
IEC 60317-16 - Specifications for particular types of winding HD 555.16 S2 1992
wires -
Part 16: Polyester enamelled rectangular
copper wire, class 155
1)
Undated reference.
2)
Valid edition at date of issue.

Publication Year Title EN/HD Year

1) 2)
IEC 60317-19 - Specifications for particular types of winding EN 60317-19 1995
wires -
Part 19: Solderable polyurethane enamelled
round copper wire overcoated with polyamide,
class 130
1) 2)
IEC 60317-20 - Specifications for particular types of winding EN 60317-20 1995
wires -
Part 20: Solderable polyurethane enamelled
round copper wire, class 155
1) 2)
IEC 60317-21 - Specifications for particular types of winding EN 60317-21 1995
wires -
Part 21: Solderable polyurethane enamelled
round copper wire overcoated with polyamide,
class 155
1) 2)
IEC 60317-22 - Specifications for particular types of winding EN 60317-22 2004
wires -
Part 22 : Polyester or polyesterimide
enamelled round copper wire overcoated with
polyamide, class 180
1) 2)
IEC 60317-23 - Specifications for particular types of winding EN 60317-23 1995
wires -
Part 23: Solderable polyesterimide enamelled
round copper wire, class 180
1) 2)
IEC 60317-25 - Specifications for particular types of winding EN 60317-25 1996
wires -
Part 25: Polyester or polyesterimide
overcoated with polyamide-imide enamelled
round aluminium wire, class 200

1) 2)
IEC 60317-29 - Specifications for particular types of winding EN 60317-29 1996
wires -
Part 29: Polyester or polyesterimide
overcoated with polyamide-imide enamelled
rectangular copper wire, class 200

1) 2)
IEC 60317-30 - Specifications for particular types of winding EN 60317-30 1996
wires -
Part 30: Polyimide enamelled rectangular
copper wire, class 220
1)
IEC 60317-34 - Specifications for particular types of winding - -
wires -
Part 34: Polyester enamelled round copper
wire, class 130 L
1) 2)
IEC 60317-42 - Specifications for particular types of winding EN 60317-42 1997
wires -
Part 42: Polyester-amide-imide enamelled
round copper wire, class 200
1) 2)
IEC 60317-46 - Specifications for particular types of winding EN 60317-46 1997
wires -
Part 46: Aromatic polyimide enamelled round
copper wire, class 240
1) 2)
IEC 60317-47 - Specifications for particular types of winding EN 60317-47 1997
wires -
Part 47: Aromatic polyimide enamelled
rectangular copper wire, class 240

- 5 - EN 61858:2008
Publication Year Title EN/HD Year

1) 2)
IEC 60317-51 - Specifications for particular types of winding EN 60317-51 2001
wires -
Part 51: Solderable polyurethane enamelled
round copper wire, class 180
1) 2)
IEC 60505 - Evaluation and qualification of electrical EN 60505 2004
insulation systems
1) 2)
IEC 61033 - Test methods for the determination of bond EN 61033 2006
strength of impregnating agents to an
enamelled wire substrate
IEC 61857 Series Electrical insulation systems - Procedures for EN 61857 Series
thermal evaluation
1) 2)
IEC 61857-1 - Electrical insulation systems - Procedures for EN 61857-1 2005
thermal evaluation -
Part 1: General requirements - Low-voltage

IEC 61858
Edition 3.0 2008-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical insulation systems – Thermal evaluation of modifications to an
established wire-wound EIS
Systèmes d’isolation électriques – Evaluation thermique des modifications
apportées à un système d’isolation électrique éprouvé à enroulements à fil

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
R
CODE PRIX
ICS 29.080.30 ISBN 2-8318-9946-X
– 2 – 61858 © IEC:2008
CONTENTS
FOREWORD.3
INTRODUCTION.5
1 Scope.6
2 Normative references .6
3 Terms and definitions .7
4 General considerations.8
5 Evaluation of the change of thickness of an EIM.10
5.1 Samples .10
5.2 Acceptance .10
6 Substitution of winding wire .10
6.1 General .10
6.2 Substitution of enamel.10
6.3 Substitution of conductor material .10
6.4 Alternate winding wire .10
7 Substitution of impregnating resin/varnish .11
7.1 Thermal class determination.11
7.2 Evaluation .11
7.2.1 Thermal classes equal or better.11
7.2.2 One thermal class lower .11
7.2.3 Other criteria .11
8 Substitution with other EIM.11
8.1 Technically equivalent materials.11
8.2 Previous evaluation .12
8.3 Other.12
9 Evaluation of additions .12
9.1 Addition of an impregnating resin/varnish .12
9.2 Addition of other components .12
10 Single-point thermal ageing test .12
10.1 Test objects.12
10.2 Establishing the EIS relative thermal endurance index (EIS RTE).12
10.3 Interpretation of results .13
Annex A (normative) Classes of winding wire.14
Annex B (normative) Compatibility test procedure.15
Bibliography.18

Figure 1 – Overview of evaluation methods.9

Table 1 – Thermal ageing test methods for resin/varnishes.11
Table A.1 – Winding wire types.14

61858 © IEC:2008 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL INSULATION SYSTEMS –
THERMAL EVALUATION OF MODIFICATIONS TO
AN ESTABLISHED WIRE-WOUND EIS
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 which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61858 has been prepared by IEC technical committee 112:
Evaluation and qualification of electrical insulating materials and systems.
This third edition cancels and replaces the second edition, published in 2004 by IEC TC 98:
Electrical insulation systems (EIS). It constitutes an editorial revision.
The text of this standard is based on the following documents:
CDV Report on voting
112/90/CDV 112/98/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 4 – 61858 © IEC:2008
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
61858 © IEC:2008 – 5 –
INTRODUCTION
This International Standard describes procedures for the evaluation of changes to an
established electrical insulation system (EIS) for wire-wound electrotechnical devices and the
effect of these changes on the thermal classification of the established EIS.
General principles for evaluation and qualification of EIS can be found in IEC 60505. Unless
the procedures of this standard indicate otherwise, the principles of IEC 60505 should be
followed.
The thermal classification of an EIS is established either by known service life, in accordance
with IEC 60505, or evaluated in accordance with IEC 61857 (all parts).

– 6 – 61858 © IEC:2008
ELECTRICAL INSULATION SYSTEMS –
THERMAL EVALUATION OF MODIFICATIONS TO
AN ESTABLISHED WIRE-WOUND EIS
1 Scope
This International Standard lists the required test procedures for qualification of modifications
of an established electrical insulation system (EIS) with respect to its thermal classification.
This standard is applicable to EIS used in wire-wound electrotechnical devices. The test
procedures are comparative in that the performance of a candidate EIS is compared to that of
a reference EIS, which has proven service experience in accordance with IEC 60505 or has
been evaluated by one of the procedures given in the IEC 61857 series.
2 Normative references
The following referenced documents are indispensable for the application 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.
IEC 60085:2007, Electrical insulation – Thermal evaluation and designation
IEC 60172, Test procedure for the determination of the temperature index of enamelled
winding wires
IEC 60216-5, Electrical insulating materials – Thermal endurance properties – Part 5:
Determination of relative thermal endurance index (RTE) of an insulating material
IEC 60317-3, Specifications for particular types of winding wires – Part 3: Polyester
enamelled round aluminium wire, class 155
IEC 60317-4, Specifications for particular types of winding wires – Part 4: Solderable
polyurethane enamelled round copper wire, class 130
IEC 60317-7, Specifications for particular types of winding wires – Part 7: Polyimide
enamelled round copper wire, class 220
IEC 60317-8, Specifications for particular types of winding wires – Part 8: Polyesterimide
enamelled round copper wire, class 180
IEC 60317-13, Specifications for particular types of winding wires – Part 13: Polyester or
polyesterimide overcoated with polyamide-imide enamelled round copper wire, class 200
IEC 60317-15, Specifications for particular types of winding wires – Part 15: Polyesterimide
enamelled round aluminium wire, class 180
IEC 60317-16, Specifications for particular types of winding wires – Part 16: Polyester
enamelled rectangular copper wire, class 155
IEC 60317-19, Specifications for particular types of winding wires – Part 19: Solderable
polyurethane enamelled round copper wire, overcoated with polyamide, class 130

61858 © IEC:2008 – 7 –
IEC 60317-20, Specifications for particular types of winding wires – Part 20: Solderable
polyurethane enamelled round copper wire, class 155
IEC 60317-21, Specifications for particular types of winding wires – Part 21: Solderable
polyurethane enamelled round copper wire overcoated with polyamide, class 155
IEC 60317-22, Specifications for particular types of winding wires – Part 22: Polyester or
polyesterimide enamelled round copper wire overcoated with polyamide, class 180
IEC 60317-23, Specifications for particular types of winding wires – Part 23: Solderable
polyesterimide enamelled round copper wire, class 180
IEC 60317-25, Specifications for particular types of winding wires – Part 25: Polyester or
polyesterimide overcoated with polyamide-imide enamelled round aluminium wire, class 200
IEC 60317-29, Specifications for particular types of winding wires – Part 29: Polyester or
polyesterimide overcoated with polyamide-imide enamelled rectangular copper wire, class 200
IEC 60317-30, Specifications for particular types of winding wires – Part 30: Polyimide
enamelled rectangular copper wire, class 220
IEC 60317-34, Specifications for particular types of winding wires – Part 34: Polyester
enamelled round copper wire,
...