IEC 61212-2:2006
(Main)Insulating materials - Industrial rigid round laminated tubes and rods based on thermosetting resins for electrical purposes - Part 2: Methods of test
Insulating materials - Industrial rigid round laminated tubes and rods based on thermosetting resins for electrical purposes - Part 2: Methods of test
IEC 61212-2:2006 describes methods of test for the materials defined in IEC 61212-1. Materials which conform to this specification meet established levels of performance. However, the selection of a material by a user for a specific application should be based on the actual requirements necessary for adequate performance in that application and not based on this specification alone. The main changes from the previous edition are as follows: added application use and safety statements. Reformatted document to bring it up to current IEC document format. Test method references updated.
Matériaux isolants - Tubes et barres industriels rigides, ronds, stratifiés, à base de résines thermodurcissables, à usages électriques - Partie 2: Méthodes d'essai
La CEI 61212-2:2006 décrit les méthodes d'essai des matériaux définis dans la CEI 61212-1. Les matériaux qui sont conformes à cette spécification satisfont à des niveaux de performances établis. Cependant, il convient que le choix d'un matériau par un utilisateur et pour une application particulière soit fondé sur les exigences réelles nécessaires pour obtenir les performances satisfaisantes pour cette application, et non pas fondé sur cette seule spécification. Les principales modifications suivantes ont été apportées par rapport à l'édition précédente: ajout d'instructions liées à l'utilisation et à la sécurité de l'application. Le document a été reformaté pour tenir compte du format en cours des documents CEI. Les références à la méthode d'essai ont été mises à jour.
General Information
Standards Content (Sample)
IEC 61212-2
®
Edition 2.0 2006-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Insulating materials – Industrial rigid round laminated tubes and rods based on
thermosetting resins for electrical purposes –
Part 2: Methods of test
Matériaux isolants – Tubes et barres industriels rigides, ronds, stratifiés, à base
de résines thermodurcissables, à usages électriques –
Partie 2: Méthodes d’essai
IEC 61212-2:2006
---------------------- Page: 1 ----------------------
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IEC 61212-2
®
Edition 2.0 2006-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Insulating materials – Industrial rigid round laminated tubes and rods based on
thermosetting resins for electrical purposes –
Part 2: Methods of test
Matériaux isolants – Tubes et barres industriels rigides, ronds, stratifiés, à base
de résines thermodurcissables, à usages électriques –
Partie 2: Méthodes d’essai
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
S
CODE PRIX
ICS 29.035.01 ISBN 978-2-88910-446-8
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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– 2 – 61212-2 © IEC:2006
CONTENTS
FOREWORD.3
INTRODUCTION.5
1 Scope.6
2 Normative references .6
3 Conditioning of specimens.7
4 Dimensions .7
4.1 General .7
4.2 External diameter .7
4.3 Internal diameter .8
4.4 Wall thickness .9
4.5 Departure from straightness – Applicable to all tubes up to 300 mm diameter .10
5 Mechanical tests.10
5.1 Flexural strength perpendicular to laminations.10
5.2 Axial compressive strength.12
5.3 Cohesion between layers .13
6 Electrical tests.15
6.1 Electric strength and breakdown voltage .15
6.2 Insulation resistance after immersion in water .17
6.3 Dissipation factor and permittivity (tube only) .17
7 Other tests .18
7.1 Thermal endurance .18
7.2 Water absorption.18
7.3 Density.18
7.4 Flammability.18
Bibliography.22
Figure 1 – Preparation of test specimen from a large tube for testing flexural strength.11
Figure 2 – Position of tube in testing machine for testing cohesion between layers .14
Figure 3 – Test specimens and electrodes for testing electric strength of tubes .16
Figure 4 – Test specimens for flammability testing.20
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61212-2 © IEC:2006 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
INSULATING MATERIALS –
INDUSTRIAL RIGID ROUND LAMINATED TUBES
AND RODS BASED ON THERMOSETTING RESINS
FOR ELECTRICAL PURPOSES –
Part 2: Methods of test
FOREWORD
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61212-2 has been prepared by IEC technical committee 15:
Standards on specifications for electrical insulating materials.
This second edition cancels and replaces the first edition published in 1995 and
constitutes a technical revision.
The main changes from the previous edition are as follows: added application use and
safety statements. Reformatted document to bring it up to current IEC document format. Test
method references updated.
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– 4 – 61212-2 © IEC:2006
This bilingual version, published in 2009-06, corresponds to the English version.
The text of this standard is based on the following documents:
FDIS Report on voting
15/273/FDIS 15/306/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.
The French version of this standard has not been voted upon.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
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.
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61212-2 © IEC:2006 – 5 –
INTRODUCTION
This part of IEC 61212 is one of a series which deals with industrial, rigid, round, laminated
tubes and rods based on thermosetting resins for electrical purposes. The materials are
similar to those described in IEC 62011-1 but of different cross-section.
This series, under the general heading Insulating materials – Industrial rigid round laminated
tubes and rods based on thermosetting resins for electrical purposes, consists of three parts:
Part 1: Definitions, designations and general requirements (IEC 61212-1)
Part 2: Methods of test (IEC 61212-2)
Part 3: Specifications for individual materials (IEC 61212-3)
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INSULATING MATERIALS –
INDUSTRIAL RIGID ROUND LAMINATED TUBES
AND RODS BASED ON THERMOSETTING RESINS
FOR ELECTRICAL PURPOSES –
Part 2: Methods of test
1 Scope
This part of IEC 61212 describes methods of test for the materials defined in IEC 61212-1.
Materials which conform to this specification meet established levels of performance.
However, the selection of a material by a user for a specific application should be based on
the actual requirements necessary for adequate performance in that application and not
based on this specification alone.
Safety warning:
It is the responsibility of the user of the methods contained or referred to in this document to
ensure that they are used in a safe manner.
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 60167:1964, Methods of test for the determination of the insulation resistance of solid
insulating materials
IEC 60212:1971, Standard conditions for use prior to and during the testing of solid electrical
insulating materials
IEC 60216-1:2001, Electrical insulating materials – Properties of thermal endurance – Part 1:
Ageing procedures and evaluation of test results
IEC 60216-2:2005, Electrical insulating materials – Thermal endurance properties – Part 2:
Determination of thermal endurance properties of electrical insulating materials – Choice of
test criteria
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 60296:2003, Fluids for electrotechnical applications – Unused mineral oils for trans-
formers and switchgear
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61212-2 © IEC:2006 – 7 –
IEC 60695-11-10:1999, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and
vertical flame test methods
1
Amendment 1 (2003)
IEC 61212-1, Insulating materials – Industrial rigid round laminated tubes and rods based on
thermosetting resins for electrical purposes – Part 1: General requirements
IEC 61212-3 (all sheets), Insulating materials – Industrial rigid round laminated tubes and
rods based on thermosetting resins for electrical purposes – Part 3: Specifications for
individual materials
ISO 62:1999, Plastics – Determination of water absorption
ISO 178:2001, Plastics – Determination of flexural properties
ISO 604:2002, Plastics – Determination of compressive properties
ISO 1183-1:2004, Plastics – Methods for determining the density and relative density of non-
cellular plastics – Part 1: Immersion method, liquid pyknometer method and titration method
ISO 3611:1978, Micrometer callipers for external measurement
ISO 3599:1976, Vernier callipers reading to 0,1 and 0,05 mm
ISO 6906:1984, Vernier callipers reading to 0,02 mm
3 Conditioning of specimens
Unless otherwise specified, test specimens shall be conditioned immediately prior to testing
for at least 24 h in standard atmosphere B according to IEC 60212 at a temperature of 23 °C
± 2 K and a relative humidity of (50 ± 5) %.
Unless otherwise specified, each specimen shall be tested in the conditioning atmosphere or
the tests shall commence within 3 min of removal of each specimen from the conditioning
atmosphere.
Where testing at an elevated temperature is required in a specification sheet of IEC 61212-3,
test specimens shall be conditioned for 1 h at the elevated temperature immediately before
testing.
4 Dimensions
4.1 General
All dimensions shall be measured in the “as received” condition.
4.2 External diameter
4.2.1 Test apparatus
The external diameter of the tubes and rods shall be determined using one of the apparatus
listed below:
—————————
1
There exists a consolidated version 1.1 (2003) that includes IEC 60695-11-10 (1999) and its Amendment 1
(2003).
---------------------- Page: 9 ----------------------
– 8 – 61212-2 © IEC:2006
a) Nominal external diameter ≤100 mm
An external screw type micrometer with an accuracy of ±0,02 mm or better, according to
ISO 3611, having faces with diameters between 6 mm and 8 mm.
b) Nominal external diameter >100 mm and ≤500 mm
A slide gauge (Vernier caliper) in accordance with ISO 3599.
c) Nominal external diameter >500 mm
A steel tape, graduated in divisions of 0,5 mm with an accuracy of ±0,1 mm or better.
Any other means of measurement with the same or better accuracy may be used. In case of
dispute, the specified apparatus shall be used.
4.2.2 Procedure
For tubes or rods with nominal external diameter ≤500 mm, measure the external diameter at
three points along the length, but not less than 20 mm from the ends, generally at both ends
and the middle. At each of these points, a minimum of three readings equally distributed
around the circumference shall be taken.
For tubes or rods with nominal external diameter >500 mm, measure the circumference at
three places along the length, distributed as above, and calculate the diameter.
4.2.3 Results
For nominal external diameters ≤100 mm, the measured values shall be recorded to the
nearest 0,02 mm.
For nominal external diameters >100 mm and ≤500 mm, the measured values shall be
recorded to the nearest 0,1 mm.
For nominal external diameters >500 mm, the diameters shall be calculated from the
measured circumferences and recorded to the nearest millimetre.
4.2.4 Report
The arithmetic mean of the recorded values shall be reported as the diameter of the tube or
rod.
4.3 Internal diameter
4.3.1 Test apparatus
The internal diameter of tubes shall be determined using one of the instruments listed below.
a) For tubes with nominal internal diameter ≤10 mm
A tapered plug gauge or pin type micrometer with an accuracy of ±0,02 mm or better.
b) For tubes with nominal internal diameter >10 mm and ≤ 500 mm
A slide gauge (Vernier caliper) in accordance with ISO 3599.
c) For tubes with nominal internal diameter >500 mm
A graduated steel tape to measure the external circumference in accordance with 4.2.1 c).
A slide gauge (Vernier caliper) to measure the wall thickness in accordance with 4 2.1. b).
Any other means of measurement having the same accuracy as specified above or better may
be used. In case of dispute, the specified apparatus shall be used.
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61212-2 © IEC:2006 – 9 –
4.3.2 Procedure
a) For tubes with nominal internal diameter ≤10 mm
Measure the internal diameter of the tube at both ends using a tapered plug gauge, or at
three points equally spaced around the inside circumference at both ends using a pin type
micrometer.
b) For tubes with nominal internal diameter >10 mm and ≤500 mm
Measure the internal diameter of the tube at a minimum of three points equally spaced
along the inside circumference at both ends.
c) For tubes with nominal internal diameter >500 mm
The internal diameter shall be calculated from the external diameter determined according
to 4.2 and the wall thickness determined according to 4.4.
4.3.3 Results
For tubes with nominal internal diameter ≤10 mm measured using a tapered plug gauge or pin
type micrometer, the values measured at the two ends shall be recorded to the nearest
0,02 mm.
For tubes with nominal internal diameter >10 mm and ≤500 mm, measured using a slide
gauge, the three values measured at the two ends shall be recorded to the nearest 0,1 mm.
For tubes with nominal internal diameter >500 mm, calculate the internal diameters using the
measured outside diameters and the corresponding measured wall thicknesses and record
the calculated values to the nearest millimetre.
4.3.4 Report
For tubes with nominal internal diameter ≤10 mm measured using a tapered plug gauge, the
arithmetic mean of the two values recorded shall be reported as the internal diameter of the
tube. For tubes with nominal internal diameter ≤10 mm measured using a pin type
micrometer, the arithmetic mean of the six values recorded shall be reported as the internal
diameter of the tube.
For tubes with nominal internal diameter >10 mm and ≤500 mm, the arithmetic mean of the
six recorded values shall be reported as the internal diameter of the tube.
For tubes with nominal internal diameter >500 mm, the arithmetic mean of the recorded
values shall be reported as the internal diameter of the tube.
4.4 Wall thickness
4.4.1 Test apparatus
The wall thickness of the tube shall be measured using a pin type micrometer, or universal
micrometer according to ISO 3611, or a suitable Vernier caliper reading to 0,02 mm according
to ISO 6906.
Any other means of measurement having the same accuracy as specified above or better may
be used. In case of dispute, the specified apparatus shall be used.
4.4.2 Procedure
Measure the wall thickness of the tube at a minimum of three points equally spaced around
the circumference at each end of the tube.
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4.4.3 Results
Record the measured values to the nearest 0,02 mm.
4.4.4 Report
Report the arithmetic mean of the values recorded as the wall thickness of the tube.
4.5 Departure from straightness – Applicable to all tubes up to 300 mm diameter
4.5.1 Test specimens
The test specimen shall be the tube under test. Where appropriate, the tube shall be trimmed
to length in order to remove excess resin or flashing from the ends prior to carrying out the
test.
4.5.2 Procedure
The length of the tube or rod shall be measured with an accuracy of ±1 mm and recorded. The
tube or rod shall then be placed on a flat, horizontal surface and rolled until the maximum gap
occurs between it and the flat surface. The tube or rod shall be maintained in this position
without applying any pressure that could deform it. The maximum gap shall be measured
using feeler or slip gauges.
4.5.3 Results
Record the measured value in millimetres to the nearest 0,1 mm as the departure from
straightness of the rod or tube under test. The limit for departure of straightness as a function
of length is given in IEC 61212-3.
4.5.4 Report
Report the value obtained in millimetres as the departure from straightness together with the
length.
5 Mechanical tests
5.1 Flexural strength perpendicular to laminations
The flexural strength shall be determined by the method specified in ISO 178.
NOTE 1 This method provides information, which is useful for the specification of materials, but the information
should not be used for structural calculations. Preparation of specimens may release residual stresses in the tube
or rod and the results may not correlate with the true flexural properties.
NOTE 2 For the materials described in this standard, the flexural strength and the flexural stress at rupture can
be regarded as identical properties.
5.1.1 Test specimens
Three specimens shall be tested.
5.1.1.1 Tubes
The test is applicable to tubes of nominal internal diameter greater than 100 mm and other
tubes from which satisfactory specimens as defined below can be produced. In the case of
moulded tubes with visible mould closing lines, at least one specimen shall be cut from the
region of each mould-closing line.
The test specimens shall be of rectangular cross-section and shall be cut from the wall of the
tube. The length axis of the specimens shall be parallel to the main axis of the tube. The
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61212-2 © IEC:2006 – 11 –
dimensions of the specimens shall be as described in ISO 178. The thickness shall lie
between 3 mm and 5 mm. The preferred thickness is 4 mm.
The other specimen dimensions shall be as described in ISO 178. See Figure 1.
h
L
b
IEC 425/06
Figure 1 – Preparation of test specimen from a large tube for testing flexural strength
5.1.1.2 Rods
Each specimen shall be a piece of rod under test except that, if the diameter of the rod
exceeds 13 mm, it shall be reduced concentrically to (13 ± 1) mm by machining. The length of
each specimen shall be not less than 20 times its diameter.
5.1.2 Procedure
5.1.2.1 Tubes
Perform the test as described in ISO 178.
The cross-head speed shall be (5 ± 1) mm/min.
5.1.2.2 Rods
The diameter of the test specimen shall be measured according to 4.2.1.
The length of the span, L, shall be (16 ± 1) D (D = diameter of the rod or the diameter of the
test specimen cut from the rod). The length of the span shall be measured to the nearest
0,5 mm.
Load the test specimen as a simple beam at mid-span without impact.
The cross-head speed shall be (5 ± 1) mm/min.
Record the load, F, at the moment of rupture.
5.1.3 Results
5.1.3.1 Tubes
Calculate the flexural strength of the rectangular specimens as described in ISO 178 and
record the three results obtained in MPa.
5.1.3.2 Rods
σ , the flexural stress at load F, is calculated in MPa from the formula:
F
---------------------- Page: 13 ----------------------
– 12 – 61212-2 © IEC:2006
M
σ =
F
W
where
3
W is the section modulus, in m ;
M is the flexural moment at load F, given by the formula:
FL
M =
4
where
F is the load at the moment of rupture in MN;
L is the span length in m.
For round specimens with diameter D:
3
πD
W =
32
Calculate the flexural strength of the specimens and record the three results obtained in MPa.
5.1.4 Report
Report the arithmetic mean of the recorded values as the flexural strength in MPa of the tube
or rod under test. The maximum and minimum values shall also be reported.
5.2 Axial compressive strength
5.2.1 General
Axial compressive strength shall be determined by the method specified in ISO 604.
5.2.2 Test specimens
Three specimens shall be tested.
The specimens shall be as described in ISO 604.
Each test specimen shall be a tube or cylinder. The ends shall be flat, parallel and 90º to the
axis. If the size of the tube or rod under test necessitates loads beyond the capacity of the
testing machine or the compression tool, smaller specimens shall be prepared in one of the
following ways:
– rods:
by concentric machining of the original rod;
– tubes:
either by reducing the wall thickness by concentric machining or by machining from the
wall of the tube under test in accordance with the recommended dimensions given in
Table 2 of ISO 604 for a type B specimen.
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61212-2 © IEC:2006 – 13 –
5.2.3 Procedure
Three specimens shall be tested in the 'as received' condition as described in ISO 604, but
with a rate of deformation as modified below.
For cylindrical specimens, determine the spec
...
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