Clevis and tongue couplings of string insulator units - Dimensions

IEC 60471:2020 applies to string insulator units of the cap and pin type and also of the long rod type as well as the fittings used with such insulators. The object of this document is to define the dimensions of a series of clevis and tongue couplings to permit the assembly of insulators or fittings supplied by different manufacturers.
This third edition cancels and replaces the second edition published in 1977. This edition includes the following significant technical changes with respect to the previous edition:
- there are no new clevis and tongue couplings;
- For the dimensions of the existing designated size of couplings that characterize the same location, the effective number of the size is unified.

Assemblages à chape et tenon des éléments de chaînes d'isolateurs - Dimensions

IEC 60471:2020 s’applique aux éléments de chaînes d’isolateurs de type à capot, à tige et également à long fût ainsi qu’aux accessoires métalliques qui leur sont associés. L’objet du présent document est de définir les dimensions d’une série d’assemblages à chape et tenon afin de permettre l’assemblage d’isolateurs ou d’accessoires métalliques fournis par différents fabricants.
Cette troisième édition annule et remplace la deuxième édition parue en 1977. La présente édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
- Selon les résultats du questionnaire (36/424/Q), il est confirmé qu’il n’existe pas de nouveaux assemblages à chape et tenon;
- Concernant les dimensions de tailles d’assemblage normalisées existantes qui caractérisent le même emplacement, le nombre de la taille en vigueur est unifié.

General Information

Status
Published
Publication Date
08-Jul-2020
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
09-Jul-2020
Ref Project

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IEC 60471
Edition 3.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Clevis and tongue couplings of string insulator units – Dimensions
Assemblages à chape et tenon des éléments de chaînes d’isolateurs –
Dimensions
IEC 60471:2020-07(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60471
Edition 3.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Clevis and tongue couplings of string insulator units – Dimensions
Assemblages à chape et tenon des éléments de chaînes d’isolateurs –
Dimensions
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.080.10; 29.240.20 ISBN 978-2-8322-8478-0

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
---------------------- Page: 3 ----------------------
– 2 – IEC 60471:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope .............................................................................................................................. 5

2 Normative references ...................................................................................................... 5

3 Terms and definitions ...................................................................................................... 5

4 Couplings ........................................................................................................................ 6

4.1 General ................................................................................................................... 6

4.2 Couplings with limited movement ............................................................................ 6

4.3 Couplings with unlimited movement ........................................................................ 6

4.4 Designation of couplings ......................................................................................... 6

5 Dimensions...................................................................................................................... 7

Bibliography .......................................................................................................................... 10

Figure 1 – Dimensions of clevis and tongue couplings for cap and pin insulators .................... 7

Figure 2 – Dimensions of clevis and tongue couplings for long rod insulators ......................... 8

Table 1 – Dimensions of clevis and tongue couplings for cap and pin insulators ..................... 7

Table 2 – Dimensions of clevis and tongue couplings for long rod insulators ........................... 9

---------------------- Page: 4 ----------------------
IEC 60471:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CLEVIS AND TONGUE COUPLINGS OF
STRING INSULATOR UNITS – DIMENSIONS
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

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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

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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.

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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60471 has been prepared by IEC technical committee 36:

Insulators.

This third edition cancels and replaces the second edition published in 1977. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:

a) According to the results of the questionnaire(36/424/Q), it is confirmed that there are no

new clevis and tongue couplings;

b) For the dimensions of the existing designated size of couplings that characterize the same

location, the effective number of the size is unified.
---------------------- Page: 5 ----------------------
– 4 – IEC 60471:2020 © IEC 2020
The text of this International Standard is based on the following documents:
FDIS Report on voting
36/484/FDIS 36/494/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 6 ----------------------
IEC 60471:2020 © IEC 2020 – 5 –
CLEVIS AND TONGUE COUPLINGS OF
STRING INSULATOR UNITS – DIMENSIONS
1 Scope

This international standard applies to string insulator units of the cap and pin type and also of

the long rod type as well as the fittings used with such insulators.

The object of this document is to define the dimensions of a series of clevis and tongue

couplings to permit the assembly of insulators or fittings supplied by different manufacturers.

NOTE 1 IEC 60305 gives the coordination between the standardized dimensions of Table 1 and the strength

classes of cap and pin insulator. IEC 60433 gives the coordination between the standardized dimensions of Table 2

and the strength classes of long rod insulators.

NOTE 2 If the dimensions given in Table 1 are not sufficient, higher strength classes are given in IEC 60305.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements 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 60050-471:2007, International Electrotechnical Vocabulary (IEV) – Part 471: Insulators

IEC 60120:2020, Ball and socket couplings of string insulator units - Dimensions
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
clevis and tongue coupling

female part of a clevis and tongue coupling with a U-shaped opening into which the tongue

coupling can be fitted

Note 1 to entry: A clevis contains two holes through which the coupling pin may pass to couple the two

components.
3.2
clevis

female part of a clevis and tongue coupling with a U-shaped opening into which the tongue

coupling can be fitted

Note 1 to entry: A clevis contains two holes through which the coupling pin may pass to couple the two

components.
---------------------- Page: 7 ----------------------
– 6 – IEC 60471:2020 © IEC 2020
3.3
tongue

male part of a clevis and tongue coupling with a tongue-shaped extremity which fits into the

U-shaped opening of the clevis and which contains a hole through which the coupling pin may

be passed
3.4
coupling pin

rigid pin which passes through the holes in the clevis and tongue to couple them together

Note 1 to entry: On one end, the coupling pin has a stud head and on the other a security device (e.g. split pin) is

placed to hold the pin in its place.
4 Couplings
4.1 General
Two coupling systems are recommended:
– Couplings with limited movement;
– Couplings with unlimited movement.
4.2 Couplings with limited movement

Couplings according to Figure 1, and Table 1, for which a limited movement of the tongue in

the clevis needs to be assured.

This type of coupling is used for cap and pin insulators to ensure that no contact is possible

between the insulating parts of two consecutive insulators. A rectangular shape is

recommended for the tongue.

These couplings are designated by the nominal diameter, expressed in millimetres, of the

coupling pin followed by the letter C.
4.3 Couplings with unlimited movement

Couplings according to Figure 2, and Table 2, for which the movement of the tongue in the

clevis is not limited.
This type of coupling is used for long rod insulators.

These couplings are designated by the nominal diameter, expressed in millimetres, of the

coupling pin followed by the letter L.
4.4 Designation of couplings

Clevis and tongue coupling are designated by the nominal diameter, expressed in millimetres,

of the coupling pin which connects the clevis and tongue. A designated coupling is defined by

the dimensions of the clevis, of the tongue and of the coupling pin.

The Figure 1 and Figure 2 giving the diameter of the coupling pin is followed by the letter C in

the case of couplings for cap and pin insulators or by the letter L in case of long rod insulators.

Any confusion shall be avoided between the designation mentioned above referring to clevis

and tongue couplings and the ball and socket couplings which are designated by nominal pin

diameter which, in certain cases, may be followed by the letter A or B (see IEC 60120),

Therefore, the type of coupling shall always be precisely designated.
---------------------- Page: 8 ----------------------
IEC 60471:2020 © IEC 2020 – 7 –
5 Dimensions

All the dimensions indicated in Table 1 and Table 2 are given in millimetres, and refer to the

finished articles after surface treatment such as, for instance, galvanizing (see also Figure 1

and Figure 2).

NOTE The outside dimensions of the clevis have not been fixed, since they depend on the mechanical

characteristics of the material used. Therefore, the length of the coupling pin is not fixed and, unless otherwise

agreed, the coupling pin shall be delivered together with the clevis. A security device shall be placed to hold the

pin in its place.

In the case of cap and pin insulators (see IEC 60305), the spacing of the insulators has been chosen so that there

will be no difficulty in inserting the coupling pin in its place. However, for some types of cap and pin insulators with

very deep rims at the lower end of the insulator close to the tongue, it may be difficult to insert the coupling pin. In

such a case, it will be necessary to check that the coupling pin can be inserted.

Figure 1 – Dimensions of clevis and tongue couplings for cap and pin insulators
Table 1 – Dimensions of clevis and tongue couplings for cap and pin insulators
Dimensions in millimetres
Designation 16C 19C 22C
Dimension Min. Nom. Max. Min. Nom. Max. Min. Nom. Max.
Coupling pin diameter d 15,5 16,0 16,3 18,6 19,0 19,4 21,8 22,0 22,6
Hole of clevis and
d 16,7 17,5 18,3 19,8 20,6 21,4 23,0 23,8 24,5
tongue
Tongue thickness 12,7 12,7 14,3 19,0 19,0 20,6 22,2 22,2 23,8
Clevis opening B 17,5 18,5 20,0 22,2 23,8 25,4 25,4 27,0 28,6
Tongue m 12,7 13,5 14,3 12,0 12,7 14,3 12,7 14,3 15,9
Clevis F 32,9 — 36,5 36,2 — 39,8 40,9 — 46,0
Clevis H — — 16,5 — — 21,0 — — 23,0
Tongue l 48 — — 56 — — 63 — —
---------------------- Page: 9 ----------------------
– 8 – IEC 60471:2020 © IEC 2020
Figure 2 – Dimensions of clevis and tongue couplings for long rod insulators
---------------------- Page: 10 ----------------------
IEC 60471:2020 © IEC 2020 – 9 –
Table 2 – Dimensions of clevis and tongue couplings for long rod insulators
Dimensions
...

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