SIST EN 60464-2:2002
(Main)Varnishes used for electrical insulation -- Part 2: Methods of test
Varnishes used for electrical insulation -- Part 2: Methods of test
Specifies methods of test to be used for testing varnishes used for electrical insulation. This includes methods of test to be applied before and others to be applied after drying and/or curing of the varnish.
Elektroisolierlacke -- Teil 2: Prüfverfahren
Vernis utilisés pour l'isolation électrique -- Partie 2: Méthodes d'essai
Spécifie les méthodes d'essai à utiliser pour essayer les vernis utilisés pour l'isolation électrique. Ces méthodes comprennent des essais à appliquer avant séchage et/ou durcissement du vernis, et d'autres après.
Varnishes used for electrical insulation - Part 2: Methods of test (IEC 60464-2:2001)
General Information
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Standards Content (Sample)
SLOVENSKI SIST EN 60464-2:2002
prva izdaja
STANDARD
oktober 2002
Varnishes used for electrical insulation - Part 2: Methods of test (IEC 60464-2:2001)
ICS 29.035.60 Referenčna številka
SIST EN 60464-2:2002(en)
© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno
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EUROPEAN STANDARD EN 60464-2
NORME EUROPÉENNE
EUROPÄISCHE NORM October 2001
ICS 17.220.99;29.035.01
English version
Varnishes used for electrical insulation
Part 2: Methods of test
(IEC 60464-2:2001)
Vernis utilisés pour l'isolation électrique Elektroisolierlacke
Partie 2: Méthodes d'essai Teil 2: Prüfverfahren
(CEI 60464-2:2001) (IEC 60464-2:2001)
This European Standard was approved by CENELEC on 2001-10-01. 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, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,
Norway, Portugal, Spain, Sweden, Switzerland and 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
© 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60464-2:2001 E
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EN 60464-2:2001 - 2 -
Foreword
The text of document 15C/1224/FDIS, future edition 2 of IEC 60464-2, prepared by SC 15C,
Specifications, of IEC TC 15, Insulating materials, was submitted to the IEC-CENELEC parallel vote
and was approved by CENELEC as EN 60464-2 on 2001-10-01.
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) 2002-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2004-10-01
Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annex ZA is normative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60464-2:2001 was approved by CENELEC as a European
Standard without any modification.
__________
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- 3 - EN 60464-2:2001
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
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 60050-212 1990 International Electrotechnical --
Vocabulary (IEV)
Chapter 212: Insulating solids, liquids
and gases
IEC 60068-2-10 1988 Basic environmental testing procedures HD 323.2.10 S3 1988
Part 2: Tests - Test J and guidance:
Mould growth
IEC 60093 1980 Methods of test for volume resistivity HD 429 S1 1983
and surface resistivity of solid electrical
insulating materials
IEC 60216 Series Electrical insulating materials - EN 60216 Series
Properties of thermal endurance
IEC 60243-1 1998 Electrical strength of insulating EN 60243-1 1998
materials - Test methods
Part 1: Tests at power frequencies
IEC 60250 1969 Recommended methods for the --
determination of the permittivity and
dielectric dissipation factor of electrical
insulating materials at power, audio and
radio frequencies including metre
wavelengths
IEC 60296 1982 Specification for unused mineral --
insulating oils for transformers and
switchgear
IEC 60464 Series Varnishes used for electrical insulation EN 60464 Series
IEC 60641-3-1 1992 Specification for pressboard and EN 60641-3-1 1994
presspaper for electrical purposes
Part 3: Specifications for individual
materials -- Sheet 1: Requirements for
pressboard, types B.0.1, B.2.1, B.2.3,
B.3.1, B.3.3, B.4.1, B.4.3, B.5.1, B.6.1
and B.7.1
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EN 60464-2:2001 - 4 -
Publication Year Title EN/HD Year
IEC 60851-4 1996 Winding wires - Test methods EN 60851-4 1996
Part 4: Chemical properties
IEC 61033 1991 Test methods for the determination of--
bond strength of impregnating agents to
an enamelled wire substrate
IEC 61099 1992 Specification for unused synthetic EN 61099 1992
organic esters for electrical purposes
ISO 291 1997 Plastics - Standard atmospheres for--
conditioning and testing
ISO 558 1980 Conditioning and testing - Standard--
atmospheres - Definitions
ISO 1144 1973 Textiles - Universal system for --
designating linear density (Tex system)
ISO 1513 1992 Paints and varnishes - Examination and EN ISO 1513 1994
preparation of samples for testing
ISO 1514 1993 Paints and varnishes - Standard panels EN ISO 1514 1997
for testing
ISO 1519 1973 Paints and varnishes - Bend test EN ISO 1519 1995
(cylindrical mandrel)
ISO 1520 1999 Paints and varnishes - Cupping test EN ISO 1520 2001
ISO 1523 1983 Paints, varnishes, petroleum and related--
products - Determination of flashpoint -
Closed cup equilibrium method
ISO 2078 1993 Textile glass - Yarns - Designation EN ISO 2078 1994
ISO 2113 1996 Reinforcement fibres - Woven fabrics ---
Basis for a specification
ISO 2431 1993 Paints and varnishes - Determination of EN ISO 2431 1996
flow time by use of flow cups
ISO 2555 1989 Plastics - Resins in the liquid state or as EN ISO 2555 1999
emulsions or dispersions -
Determination of apparent viscosity by
the Brookfield test method
ISO 2578 1993 Plastics EN ISO 2578 1998
Determination of time-temperature limits
after prolonged exposure to heat
ISO 2592 2000 Determination of flash and fire points - EN ISO 2592 2001
Cleveland open cup method
ISO 2808 1997 Paints and varnishes - Determination of EN ISO 2808 1999
film thickness
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- 5 - EN 60464-2:2001
Publication Year Title EN/HD Year
ISO 2811 Series Paints and varnishes - Determination of EN ISO 2811 Series
density
ISO 2812-1 1993 Paints and varnishes - Determination of EN ISO 2812-1 1994
resistance to liquids
Part 1: General methods
ISO 3219 1993 Plastics - Polymers/resins in the liquid EN ISO 3219 1994
state or as emulsions or dispersions -
Determination of viscosity using a
rotational viscometer with defined shear
rate
ISO 3251 1993 Paints and varnishes - Determination of EN ISO 3251 1995
non-volatile matter of paints, varnishes
and binders for paints and varnishes
ISO 3679 1983 Paints, varnishes, petroleum and related EN 456 1991
(mod.) products - Determination of flashpoint -
Rapid equilibrium method
ISO 15528 2000 Paints, varnishes and raw materials for EN ISO 15528 2000
paints and varnishes - Sampling
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NORME
CEI
INTERNATIONALE IEC
60464-2
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
2001-07
Vernis utilisés pour l'isolation électrique –
Partie 2:
Méthodes d'essai
Varnishes used for electrical insulation –
Part 2:
Methods of test
© IEC 2001 Droits de reproduction réservés ⎯ Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun procédé, any form or by any means, electronic or mechanical,
électronique ou mécanique, y compris la photocopie et les including photocopying and microfilm, without permission in
microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http://www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
R
PRICE CODE
International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue
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60464-2 © IEC:2001 – 3 –
CONTENTS
FOREWORD . 5
INTRODUCTION .7
1 Scope . 9
2 Normative references. 9
3 Definitions. 13
4 General notes on methods of test . 13
5 Methods of test for undried and/or uncured varnishes . 15
5.1 Flashpoint. 15
5.2 Density . 15
5.3 Viscosity . 15
5.4 Content of non-volatile matter . 15
5.5 Dilution ability . 15
5.6 Stability of varnish in an open vessel . 17
5.7 Drying and/or curing in thick layer. 17
5.8 Effect of varnish on enamelled winding wires . 21
6 Methods of test for dried and/or cured varnishes. 21
6.1 Test specimen . 21
6.2 Mechanical properties. 25
6.3 Thermal properties. 25
6.4 Chemical properties . 27
6.5 Electrical properties . 31
Figure 1 – Test set-up for volume resistivity . 37
Figure 2 – Example of electrode arrangement . 39
Table 1 – Condition of the top side . 19
Table 2 – Condition of the bottom side . 19
Table 3 – Condition of the interior . 19
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60464-2 © IEC:2001 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
VARNISHES USED FOR ELECTRICAL INSULATION –
Part 2: Methods of test
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60464-2 has been prepared by subcommittee 15C: Specifications,
of IEC technical committee 15: Insulating materials.
This second edition cancels and replaces the first edition, published in 1974, and constitutes
a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
15C/1224/FDIS 15C/1253/RVD
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 3.
The committee has decided that the contents of this publication will remain unchanged
until 2005. At this date, the publication will be
reconfirmed;
withdrawn;
replaced by a revised edition, or
amended.
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60464-2 © IEC:2001 – 7 –
INTRODUCTION
This part of IEC 60464 is one of a series which deals with varnishes used for electrical
insulation. The series consists of three parts:
Part 1: Definitions and general requirements (IEC 60464-1);
Part 2: Methods of test (IEC 60464-2);
Part 3: Specifications for individual materials (IEC 60464-3).
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60464-2 © IEC:2001 – 9 –
VARNISHES USED FOR ELECTRICAL INSULATION –
Part 2: Methods of test
1 Scope
This part of IEC 60464 specifies methods of test to be used for testing varnishes used for
electrical insulation. This includes methods of test to be applied before and others to be
applied after drying and/or curing of the varnish.
2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this part of IEC 60464. For dated references, subsequent amend-
ments to, or revisions of, any of these publications do not apply. However, parties to
agreements based on this part of IEC 60464 are encouraged to investigate the possibility of
applying the most recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of IEC
and ISO maintain registers of currently valid International Standards.
IEC 60050(212):1990, International Electrotechnical Vocabulary (IEV) – Chapter 212: Insulating
solids, liquids and gases
IEC 60068-2-10:1988, Environmental testing – Part 2: Tests – Test J and guidance: Mould
growth
IEC 60093:1980, Methods of test for volume resistivity and surface resistivity of solid
electrical insulating materials
IEC 60216 (all parts), Guide for the determination of thermal endurance properties of
electrical insulating materials
IEC 60243-1:1998, Electrical strength of insulating materials – Test methods – Part 1: Tests
at power frequencies
IEC 60250:1969, Recommended methods for the determination of the permittivity and
dielectric dissipation factor of electrical insulating materials at power, audio and radio
frequencies including metre wavelengths
IEC 60296:1982, Specification for unused mineral insulating oils for transformers and
switchgear
IEC 60464 (all parts), Varnishes used for electrical insulation
IEC 60641-3-1:1992, Specification for pressboard and presspaper for electrical purposes –
Part 3: Specifications for individual materials – Sheet 1: Requirements for pressboard, types
B.0.1, B.2.1, B.2.3, B.3.1, B.3.3, B.4.1, B.4.3, B.5,1, B.6.1 and B.7.1
IEC 60851-4:1996, Methods of test for winding wires – Part 4: Chemical properties
IEC 61033:1991, Test methods for the determination of bond strength of impregnating agents
to an enamelled wire substrate
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60464-2 © IEC:2001 – 11 –
IEC 61099:1992, Specifications for unused synthetic organic esters for electrical purposes
ISO 291:1997, Plastics – Standard atmospheres for conditioning and testing
ISO 558:1980, Conditioning and testing – Standard atmospheres – Definitions
ISO 1144:1973, Textiles – Universal system for designating linear density (Tex System)
ISO 1513:1992, Paints and varnishes – Examination and preparation of samples for testing
ISO 1514:1993, Paints and varnishes – Standard panels for testing
ISO 1519:1973, Paints and varnishes – Bend test (cylindrical mandrel)
ISO 1520:1999, Paints and varnishes – Cupping test
ISO 1523:1983, Paints, varnishes, petroleum and related products – Determination of flash
point – Closed cup equilibrium method
ISO 2078:1993, Textile glass – Yarns – Designation
ISO 2113:1996, Reinforcement fibres – Woven fabrics – Basis for a specification
ISO 2431:1993, Paints and varnishes – Determination of flow time by use of flow cups
ISO 2555:1989, Plastics – Resins in the liquid state or as emulsions or dispersions –
Determination of apparent viscosity by the Brookfield Test method
ISO 2578:1993, Plastics – Determination of time-temperature limits after prolonged exposure
to heat
ISO 2592:2000, Determination of flash and fire points – Cleveland open cup method
ISO 2808:1997, Paints and varnishes – Determination of film thickness
ISO 2811 (all parts), Paints and varnishes – Determination of density
ISO 2812-1:1993, Paints and varnishes – Determination of resistance to liquids – Part 1:
General methods
ISO 3219:1993, Plastics – Polymers/resins in the liquid state or as emulsions or dispersions –
Determination of viscosity using a rotational viscometer with defined shear rate
ISO 3251:1993, Paints and varnishes – Determination of non-volatile matter of paints,
varnishes and binders for paints and varnishes
ISO 3679:1983, Paints, varnishes, petroleum and related products – Determination of
flashpoint – Rapid equilibrium method
ISO 15528:2000, Paints, varnishes and raw materials for paints and varnishes – Sampling
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60464-2 © IEC:2001 – 13 –
3 Definitions
For the purposes of this part of IEC 60464, the following definitions as well as the definitions
of IEC 60050(212) and IEC 60464-1 apply.
3.1
volume resistance
that part of the insulation resistance which is due to conduction through the volume and
excludes surface current
3.2
volume resistivity
volume resistance reduced to a cubical unit volume
3.3
dielectric dissipation factor (tan δ)
numerical value of the ratio of the imaginary to the real part of the complex permittivity
3.4
relative permittivity (ε )
r
ratio of the absolute permittivity to the electric constant
NOTE In practical engineering, it is usual to employ the term "permittivity" when referring to relative permittivity.
4 General notes on methods of test
Unless otherwise specified in the relevant specification standard, or in the method of test, all
tests shall be carried out at atmospheric conditions in a temperature of (25 ± 4) °C and a
relative humidity range between 45 % to 70 %. Before measurements are made, the sample
or test specimen shall be pre-conditioned under these atmospheric conditions for a time
sufficient to allow the sample or the test specimen to reach stability. For taking samples in
liquid or paste form, ISO 15528 shall be applied. For preparation of such samples for testing,
ISO 1513 shall be applied.
NOTE For definitions of terms for standard atmospheres, see ISO 558. The test atmosphere as specified above
does not comply with any of the two standard atmospheres as specified in ISO 291 but covers both ranges
inclusive of their tolerances.
Normally, all mandatory requirements for a method of test are given in the description, and
diagrams are intended only to illustrate one possible arrangement for conducting the test. In
case of inconsistencies between this standard and the specification sheets of IEC 60464-3,
the latter shall prevail.
When another standard is invoked for a test method, reference to that standard shall be
included in the report.
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60464-2 © IEC:2001 – 15 –
5 Methods of test for undried and/or uncured varnishes
The materials before drying and/or curing are varnishes in their original liquid state.
5.1 Flashpoint
For flashpoint temperatures of 79 °C and above, the method given in ISO 2592 shall be used.
For flashpoint temperatures below 79 °C, the method given in ISO 1523 shall be used with
any of the closed-cup apparatus as described in annex A of that standard. ISO 1523 shall be
read in conjunction with ISO 3679.
Two measurements shall be made on two separate samples and the two results of flashpoint
shall be reported.
5.2 Density
The method given in ISO 2811 shall be used. Two measurements shall be made and the two
results of density shall be reported.
5.3 Viscosity
The viscosity shall be determined with a suitable device at (23 ± 0,5) °C. If a rotating type of
device is used, it shall be in accordance with ISO 2555 (Brookfield type) or with ISO 3219
(a type working at defined shear rate). If an efflux type of equipment is used, the method of
test and the flow cup shall be in accordance with ISO 2431.
Two measurements shall be made and the two results of viscosity shall be reported.
5.4 Content of non-volatile matter
The method given in ISO 3251 shall be used. Two measurements shall be made and the two
results of the content of non-volatile matter shall be reported.
5.5 Dilution ability
Dilution ability is expressed by the amount of solvent and/or diluent which can be added to the
varnish until cloudiness or separation is observed.
5.5.1 Procedure
A varnish sample of (50 ± 1) ml shall be poured into a glass cylinder of about 250 ml volume.
Solvent and/or diluent as agreed between supplier and purchaser shall be added in defined
portions of for instance (10 ± 0,2) ml until cloudiness or separation is observed. After each
addition, the content of the glass cylinder shall be properly stirred to obtain a homogeneous
mixture and shall be allowed to settle for at least 5 min and not more than 10 min.
5.5.2 Result
One measurement shall be made and the type of solvent and/or diluent and the percentage in
volume added without appearance of cloudiness or separation shall be reported.
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60464-2 © IEC:2001 – 17 –
5.6 Stability of varnish in an open vessel
Stability in an open vessel is expressed by the change in viscosity after storing the varnish at
(50 ± 2) °C for (96 ± 1) h (four days).
5.6.1 Equipment
If not otherwise specified, the following equipment shall be used:
– a glass cylinder of 7 cm to 8 cm in diameter and of 9 cm to 10 cm in height;
– an oven without forced air circulation and with a rate of ventilation of 6 to 10 air changes
per hour.
5.6.2 Procedure
Viscosity of the varnish sample shall be determined in accordance with 5.3 at (23 ± 0,5) °C.
A varnish sample of (150 ± 1) g shall then be weighed into the glass cylinder and shall be
placed in the oven maintained at (50 ± 2) °C. Every 24 h an amount of solvent and/or diluent
as agreed between supplier and purchaser shall be added to compensate for that lost by
evaporation and shall be properly mixed with the varnish. When the same procedure is
completed after 96 h, the viscosity of the varnish shall be determined according to 5.3 at
(23 ± 0,5) °C.
5.6.3 Result
One measurement shall be made and the type of solvent and/or diluent as well as the
viscosity before and the viscosity after temperature exposure shall be reported.
5.7 Drying and/or curing in thick layer
Drying and/or curing in thick layer is expressed by the condition after curing of the top side,
bottom side and interior of the specimen.
5.7.1 Equipment
The following equipment shall be used:
– flat and smooth square pieces of aluminium foil, 0,1 mm to 0,15 mm in thickness, having a
side length of (95 ± 1) mm;
– a square form made of metal or any suitable solid material (25 ± 1) mm in thickness and
having a side length of (45 ± 1) mm;
– an oven with forced air circulation and with a minimum rate of eight fresh-air changes per
hour. The oven shall be of the type and design used for drying and/or curing specimens.
5.7.2 Test specimen
A piece of aluminium foil shall be cleaned by adequate means and shall be folded around the
form to produce a square mould of about 45 mm side length. A varnish sample with a mass of
m = 810 ρ/X
shall be weighed to 0,1 g into the mould,
where
m is the sample mass in grams (g);
3
ρ is the density in grams per cubic centimetre (g/cm );
X is the non-volatile matter in per cent (%).
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60464-2 © IEC:2001 – 19 –
After drying and/or curing at a temperature and for a time agreed between the supplier and
the purchaser, the aluminium foil shall be removed.
3
NOTE Using the coefficient 810 cm in the above equation ensures a resulting thickness of the specimen of about
4 mm after removing the aluminium foil.
5.7.3 Procedure
The specimen shall be assessed by description of the conditions of its top side, bottom side
and interior, expressed according to statements for visual appearance and for tackiness by
the symbols given in tables 1, 2 and 3.
Table 1 – Condition of the top side
Condition Symbol
Smooth S 1
Wrinkled S 2
Table 2 – Condition of the bottom side
Condition Symbol
Non-tacky U 1
Tacky U 2
Tackiness shall be determined according to 6.4.1.
Table 3 – Condition of the interior
Condition Symbol X
Rigid I 1.X
Horny machinable I 2.X
Leather-like I 3.X
Rubber-like I 4.X
Gel-like I 5.X
Liquid I 6.X
The specimen contains
– no voids 1
– not more than five voids 2
– more than five voids 3
For the condition of the interior, a statement shall be added whether the interior is uniform or
not uniform.
NOTE It may be necessary to cut the specimen, to bend the specimen with the fingers or to use a knife for
describing the mechanical properties.
5.7.4 Result
Two specimens shall be tested and the two results of drying and/or curing in thick layer shall
be reported.
EXAMPLE For a specimen which has a smooth top side and a non-tacky bottom side, which
is leather-like and uniform and which contains three voids, the result is described as:
S 1 – U 1 – I 3.2 – uniform.
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60464-2 © IEC:2001 – 21 –
5.8 Effect of varnish on enamelled winding wires
The effect of varnish on enamelled wire is expressed by the pencil hardness of the wire
coating after varnish treatment of a straight piece of wire according to IEC 60851-4.
Three straight pieces of wire shall be tested and the three results of pencil hardness shall be
reported.
6 Methods of test for dried and/or cured varnishes
The materials after drying and/or curing are varnish coatings on substrates.
6.1 Test specimen
The number of specimens and the type of substrate required are specified in the particular
method of test, in the relevant specification sheet of IEC 60464-3 or shall be agreed upon
between the supplier and the purchaser. The term "test specimen" refers to a substrate with
the dried and/or cured varnish coating or impregnation as required for the respective method
of test. In the following text "test specimen" is referred to as "specimen".
If steel panels and/or glass fabric are required as substrate, they shall be in accordance with
6.
...
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