IEC 61212-3-2:2013

Insulating materials - Industrial rigid round laminated tubes and rods based on thermosetting resins for electrical purposes - Part 3: Specifications for individual materials - Sheet 2: Round laminated moulded tubes

IEC 61212-3-2:2013 gives requirements for industrial rigid round laminated moulded tubes for electrical purposes, based on different resins and different reinforcements. Applications and distinguishing properties are given in Table 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. This third edition cancels and replaces the second edition published in 2006. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: Details of test for insulation resistance after immersion in water are changed. Key words: industrial rigid round laminated moulded tubes

Matériaux isolants - Tubes et barres industriels rigides, ronds, stratifiés, à base de résines thermodurcissables, à usages électriques - Partie 3: Spécifications pour matériaux particuliers - Feuille 2: Tubes ronds stratifiés moulés

La CEI 61212-3-2:2013 donne les exigences relatives aux tubes industriels rigides ronds, stratifiés, moulés, à usages électriques, à base de différentes résines et de différents matériaux de renfort. Les applications et les propriétés distinctives sont données au Tableau 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. Cette troisième édition annule et remplace la deuxième édition parue en 2006 et constitue une révision technique. Cette édition inclut fications techniques majeures suivantes par rapport à l'édition précédente: Les détails d'essais relatifs à la résistance d'isolement après immersion dans l'eau ont été modifiés. Mots clés: tubes industriels rigides ronds, stratifiés, moulés

General Information

• Status: Published
• Publication Date: 28-Apr-2013
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.035.01 - Insulating materials in general
• Technical Committee: TC 15 - Solid electrical insulating materials
• Drafting Committee: WG 6 - TC 15/WG 6
• Current Stage: PPUB - Publication issued
• Start Date: 31-May-2013
• Completion Date: 29-Apr-2013

Standards Content (Sample)

IEC 61212-3-2
®

Edition 3.0 2013-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Insulating materials – Industrial rigid round laminated tubes and rods based on
thermosetting resins for electrical purposes –
Part 3: Specifications for individual materials – Sheet 2: Round laminated
moulded tubes

Matériaux isolants – Tubes et barres industriels rigides, ronds, stratifiés, à base
de résines thermodurcissables, à usages électriques –
Partie 3: Spécifications pour matériaux particuliers – Feuille 2: Tubes ronds
stratifiés moulés

IEC 61212-3-2:2013

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IEC 61212-3-2

®


Edition 3.0 2013-04




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











Insulating materials – Industrial rigid round laminated tubes and rods based on

thermosetting resins for electrical purposes –

Part 3: Specifications for individual materials – Sheet 2: Round laminated


moulded tubes



Matériaux isolants – Tubes et barres industriels rigides, ronds, stratifiés, à base


de résines thermodurcissables, à usages électriques –

Partie 3: Spécifications pour matériaux particuliers – Feuille 2: Tubes ronds

stratifiés moulés










INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX M


ICS 29.035.01 ISBN 978-2-83220-759-8



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – 61212-3-2 © IEC:2013
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Designations and abbreviations . 7
4.1 General . 7
4.2 Designation . 7
4.3 Abbreviations . 7
5 Requirements . 7
Bibliography . 13

Table 1 – Types of industrial round moulded tubes . 8
Table 2 – Permissible deviation from nominal external diameter of round moulded
tubes in the “as moulded" condition . 8
Table 3 – Permissible deviation from nominal external diameter of moulded tubes in
ground or turned condition, all types . 9
Table 4 – Permissible deviation from nominal internal diameter of moulded tubes . 9
Table 5 – Tolerance on wall thickness for round moulded tubes . 9
Table 6 – Departure from straightness for round moulded tubes . 10
Table 7 – Property requirements for round moulded tubes . 11
Table 8 – Electric strength at 90 °C in oil, perpendicular to laminations for round
a
moulded tubes (1 min proof test or 20 s step-by-step test) (kV/mm) . 12

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61212-3-2 © IEC:2013 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

INSULATING MATERIALS –
INDUSTRIAL RIGID ROUND LAMINATED TUBES
AND RODS BASED ON THERMOSETTING RESINS
FOR ELECTRICAL PURPOSES –

Part 3: Specifications for individual materials –
Sheet 2: Round laminated moulded tubes


FOREWORD
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all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61212-3-2 has been prepared by IEC technical committee 15:
Solid electrical insulating material.
This third edition cancels and replaces the second edition published in 2006. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
Details of test for insulation resistance after immersion in water are changed.

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– 4 – 61212-3-2 © IEC:2013
The text of this standard is based on the following documents:
FDIS Report on voting
15/700/FDIS 15/710/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 2.
A list of all parts in the IEC 61212 series, published under the general title Insulating
materials – Industrial rigid round laminated tubes and rods based on thermosetting resins for
electrical purposes, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability 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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61212-3-2 © IEC:2013 – 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.
This series 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)
IEC 61212-3-2 contains one of the specification sheets comprising Part 3, as follows:
Sheet 2: Round laminated moulded tubes.

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– 6 – 61212-3-2 © IEC:2013
INSULATING MATERIALS –
INDUSTRIAL RIGID ROUND LAMINATED TUBES
AND RODS BASED ON THERMOSETTING RESINS
FOR ELECTRICAL PURPOSES –

Part 3: Specifications for individual materials –
Sheet 2: Round laminated moulded tubes



1 Scope
This part of IEC 61212 gives requirements for industrial rigid round laminated moulded tubes
for electrical purposes, based on different resins and different reinforcements.
Applications and distinguishing properties are given in Table 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 documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 61212-1, Insulating materials – Industrial rigid round laminated tubes and rods based on
thermosetting resins for electrical purposes – Part 1: Definitions, designations and general
requirements
IEC 61212-2:2006, Insulating materials – Industrial rigid round laminated tubes and rods
based on thermosetting resins for electrical purposes – Part 2: Methods of test
3 Terms and definitions
For the purposes of this document, the following term and definition apply.
3.1
moulded tube
tube formed by rolling impregnated layers of material on a mandrel, curing the
assembly in a cylindrical mould under heat and pressure, and then removing the mandrel
[SOURCE: ISO 472:1999, modified – In the ISO definition, the term “laminated moulded tube”
is used instead of “moulded tube” and an indication “or other suitable” is provided between
the words “cylindrical” and “mould”.]

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61212-3-2 © IEC:2013 – 7 –
4 Designations and abbreviations
4.1 General
The moulded tubes covered by this Part 3 sheet are classified into types which differ in the
resin and reinforcement used, the method of manufacture and their distinguishing properties.
4.2 Designation
Individual types are designated by:
– a two-letter abbreviation denoting the resin;
– a second two-letter abbreviation, denoting the reinforcement;
– a serial number of two digits, the first digit denoting the form of the material,
a “3” indicates moulded tubes,
and, a second digit denoting sub-grades of the same type.
The abbreviations are given in 4.3.
The complete designation of the moulded tube is denoted by:
– description: moulded tube;
– number of the IEC standard: IEC 61212-3-2;
– designation of the individual type;
– dimensions (in millimetres) of the moulded tube:
internal diameter × external diameter × length;
– a letter designating the finish on the external diameter of the moulded tube:
"A" designating moulded tubes in the "as produced" condition;
"B" designating moulded tubes in ground or turned condition.
EXAMPLE Moulded tube, IEC 61212-3-2 – EP CC 31 – 25 × 35 × 1 000-A.
4.3 Abbreviations
Types of resin Types of reinforcement
EP Epoxy (epoxide) CC Woven cotton cloth
PF Phenolic CP Cellulosic paper
5 Requirements
In addition to the general requirements given in IEC 61212-1, the moulded tubes shall comply
with the additional requirements given in Tables 2, 3, 4, 5, 6, 7, and 8, with the exception of
the length of tube supplied, which shall be subject to agreement between buyer and seller.

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Table 1 – Types of industrial round moulded tubes
a
Resin Reinforce- Serial Applications and distinguishing characteristics

ment number
Mechanical, electrical and electronic applications. Good resistance to
EP CC 31 b
tracking. fine weave .
b
31 Mechanical and electrical applications. fine weave .
b
CC 32 Similar to type PF CC 31, but of coarse weave .
b
33 Similar to type PF CC 31, but of very coarse weave .
PF
Electrical and mechanical applications. Good electrical properties when
31
exposed to normal relative humidity.
CP
Similar to type PF CP 31, but with improved mechanical and electrical
32
properties.
a
It should not be inferred from the contents of Table 1 that round laminated moulded tubes of any particular type
are necessarily unsuitable for applications other than those listed for them, or that specific round laminated
moulded tubes will be suitable for all applications within the wide description given.
b
Fabric weaves of type CC reinforcements:

Mass per unit area Thread count
2 -1
g/m cm
Very coarse weave > 200 < 18
Coarse weave > 130 18 to 29
Fine weave 30 to 37
≤ 130
Very fine weave
≤ 125 > 37
These values are only for information. They are not to be considered as specification values. In general, the finer
weave materials have better machining characteristics.

Table 2 – Permissible deviation from nominal external
diameter of round moulded tubes in the “as moulded" condition
Maximum deviation, ± mm
Nominal external diameter D
Type
mm
PF CP EP CC PF CC
≤ 3 0,08 --
3 < D ≤ 6 0,1 --
6 < D ≤ 10 0,15 --
0,2 0,3
10 < D ≤ 20
20 < D ≤ 30 0,3 0,4
30 < D ≤ 50 0,3 0,4
50 < D ≤ 75 0,4 0,4
75 < D ≤ 100 0,5 0,5
100 < D ≤ 150 0,6 0,6
0,7 0,7
150 < D ≤ 200
200 < D ≤ 300 0,75 0,75
300 < D ≤ 500 0,8 0,8
> 500 1,0 1,0
Test method: see 4.1 of IEC 61212-2:2006.
NOTE A double dash “--“ signifies that there is no requirement.

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61212-3-2 © IEC:2013 – 9 –
Table 3 – Permissible deviation from nominal external diameter of moulded tubes in
ground or turned condition, all types
a
Nominal external diameter D Maximum deviation
mm ± mm
0,15
≤ 25
0,25
25 < D ≤ 50
0,30
50 < D ≤ 75
0,35
75 < D ≤ 100
0,45
100 < D ≤ 125
0,50
> 125
Test method: see 4.2 of IEC 61212-2:2006.
a
If a unilateral tolerance is agreed between purchaser and supplier, the tolerance

may not be greater than twice the value given in the table.

Table 4 – Permissible deviation from nominal internal diameter of moulded tubes
a
Nominal internal diameter d Maximum deviation
mm
± mm
b
0,10
≤ 3
0,15
3 < d ≤ 30
0,20
30 < d ≤ 50
0,25
50 < d ≤ 75
0,30
75 < d ≤ 100
0,50
100 < d ≤ 150
0,70
150 < d ≤ 200
1,00
200 < d ≤ 300
1,50
300 < d ≤ 500
2,00
> 500
Test method: see 4.3 of IEC 61212-2:2006.
a
If a unilateral tolerance is agreed between purchaser and supplier, the tolerance
may not be greater than twice the value given in the table.
b
Applicable to PF CP types only.

Table 5 – Tolerance on wall thickness for round moulded tubes
Maximum deviation
± mm
Nominal wall thickness t Types
mm
PF CP EP CC PF CC
PF CP 32 PF CC 31 PF CC 33
PF CC 34
≤ 1,5 0,25 0,28 0,40
0,40 0,45 0,60
1,5 < t ≤ 3,0
0,55 0,60 0,85
3,0 < t ≤ 6,0
0,90 1,00 1,35
6,0 < t ≤ 12,0
1,30 1,40 1,90
12,0 < t ≤ 25,0
2,00 2,00 2,70
> 25,0
Test method: see 4.4 of IEC 61212-2:2006.

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Table 6 – Departure from straightness for round moulded tubes
Nominal external diameter D Maximum deviation
mm mm
2
8 L
D < 8
2
6 L
D ≥ 8
Test method: see 4.5 of IEC 61212-2:2006.
The departure from straightness of any tube shall not exceed the appropriate limiting
value given above, where L is the length of the tube in metres.

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61212-3-2 © IEC:2013             – 11 –

Table 7 – Property requirements for round moulded tubes
Method of Type Remarks
Test
Maximum
IEC 61212-
Property Unit or
EP CC PF CC PF CC PF CC PF CP PF CP
2:2006

minimum
31 31 32 33 31 32
(Subclause
No.)
Generally applicable to tubes of internal
diameter greater than 100 mm but to all
Flexural strength tubes where satisfactory test pieces can be
5.1 MPa minimum 80 80 80 80 80 80
perpendicular to laminations produced. For tubes of internal diameter less
than 100 mm however the test for cohesion
between layers is an alternative method.
Axial compressive strength 5.2 MPa minimum 125 100 100 100 70 100
Applicable only to tubes of nominal internal
Cohesion between layers 5.3 MPa minimum 100 90 90 90 60 70
diameter not greater than 100 mm.
Breakdown voltage at The 20 s step-by-step test and the 1 min
90 °C in oil parallel to 6.1 kV minimum 40 5 5 5 10 30 proof test for breakdown voltage at 90 °C in
laminations oil, parallel to laminations, are alternatives.
Electric strength at 90 °C in
Applicable only to tubes of nominal wall
oil perpendicular to 6.1 kV/mm minimum See Table 8
thickness not greater than 3 mm.
laminations
Insulation resistance after
6.2 minimum 75 10 5 1 0,1 75
MΩ
immersion in water
Dissipation factor Conformance with the requirement for either
1 MHz 6.3 – maximum (0,05) -- -- -- -- -- test constitutes conformance with the
48 Hz to 62 Hz specification in this respect.
Permittivity Conformance with the requirement for either
1 MHz 6.3 – maximum (6,0) -- -- -- -- -- test constitutes conformance with the
48 Hz to 62 Hz specification in this respect.
Thermal endurance 7.1 TI (130) (120) (120) (120) (120) (120)
2
Water absorption 7.2 mg/cm maximum 3,0 5,0 6,0 8,0 8,0 3,0
(1,20 – (1,20 – (1,20 – (1,20 – (1,20 – (1,20 –
3
Density 7.3 g/cm Range
1,40) 1,40) 1,40) 1,40) 1,40) 1,40)
Values in brackets “( )” are intended to give only general guidance and are not to be considered as requirement of this standard.
NOTE A double dash ”--“ signifies that there is no requirement.

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Table 8 – Electric strength at 90 °C in oil, perpendicular to laminations for round
a
moulded tubes (1 min proof test or 20 s step-by-step test) (kV/mm)
b
Nominal wall thickness of test specimen
mm
Type
1,0 1,2 1,4 1,6 1,8 2,0 2,2 2,4 2,5 2,6 2,8 3,0
EP CC 31 7,5 6,8 6,3 5,9 5,5 5,3 5,1 5,0 4,9 4,8 4,7 4,7
PF CC 31 2,4 2,3 2,2 2,1 2,1 2,0 1,9 1,9 1,8 1,8 1,7 1,6
PF CC 32 2,4 2,3 2,2 2,1 2,1 2,0 1,9 1,9 1,8 1,8 1,7 1,6
PF CC 33 -- -- -- -- -- 2,0 1,9 1,9 1,8 1,8 1,7 1,6
PF CP 31 7,5 6,8 6,3 5,9 5,5 5,3 5,1 5,0 4,9 4,8 4,7 4,7
PF CP 32 9,7 9,0 8,2 7,8 7,4 7,0 6,7 6,5 6,4 6,3 6,2 6,1
Test method: see 6.1 of IEC 61212-2:2006.
NOTE A double dash “--“ signifies that there is no requirement.
a
 The requirements for the 20 s step-by-step test and the 1 min proof test for electric strength at 90 °C in oil,
perpendicular to laminations, are alternatives. A material meeting either requirement is deemed to comply
with the specification with respect to electric strength at 90 °C in oil, perpendicular to laminations.
b
 If the nominal wall thickness of the test specimen lies between two values of wall thickness shown in the
above table, the limit is obtained by interpolation. If the nominal wall thickness is below the minimum
thickness for which a limit is given, the electric strength limit appropriate to the minimum thickness shall

apply. For nominal wall thicknesses greater than 3,0 mm, the values for 3,0 mm shall apply.

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61212-3-2 © IEC:2013 – 13 –
Bibliography
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 472:1999, Plastics – Vocabulary

___________

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– 14 – 61212-3-2 © CEI:2013
SOMMAIRE
AVANT-PROPOS . 15
INTRODUCTION . 17
1 Domaine d’application . 18
2 Références normatives . 18
3 Termes et définitions . 18
4 Désignations et abréviations . 19
4.1 Généralités. 19
4.2 Désignation . 19
4.3 Abréviations . 19
5 Exigences . 19
Bibliographie . 25

Tableau 1 – Types de tubes industriels ronds moulés . 20
Tableau 2 – Écart admis par rapport au diamètre extérieur nominal des tubes ronds
moulés bruts de moulage . 20
Tableau 3 – Écart admissible par rapport au diamètre extérieur nominal des tubes
moulés, rectifiés ou tournés, de tous types . 21
Tableau 4 – Écart admissible par rapport au diamètre intérieur nominal des tubes
moulés . 21
Tableau 5 – Tolérance pour l’épaisseur de paroi des tubes ronds moulés . 22
Tableau 6 – Écart de rectitude des tubes ronds moulés . 22
Tableau 7 – Exigences relatives aux propriétés des tubes ronds moulés . 23
Tableau 8 – Rigidité diélectrique à 90 °C dans l’huile, perpendiculairement aux
couches, pour tubes ronds moulés (essai de rupture par traction de 1 min ou essai par
a
paliers de 20 s) (kV/mm). 24

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61212-3-2 © CEI:2013 – 15 –
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________

MATÉRIAUX ISOLANTS –
TUBES ET BARRES INDUSTRIELS RIGIDES, RONDS, STRATIFIÉS, À BASE
DE RÉSINES THERMODURCISSABLES, À USAGES ÉLECTRIQUES –

Partie 3: Spécifications pour matériaux particuliers –
Feuille 2: Tubes ronds stratifiés moulés


AVANT-PROPOS
1) La Commission Electrotechnique Internationale (CEI) est une organisation mondiale de normalisation
composée de l'ensemble des co
...