IEC 60120:2020

Ball and socket couplings of string insulator units - Dimensions

IEC 60120:2020

Name:IEC 60120:2020   Standard name:Ball and socket couplings of string insulator units - Dimensions
Standard number:IEC 60120:2020   language:English and French language
Release Date:21-Jul-2020   technical committee:TC 36 - Insulators
Drafting committee:MT 21 - TC 36/MT 21   ICS number:01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION

IEC 60120
Edition 4.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ball and socket couplings of string insulator units – Dimensions

Assemblages à rotule des éléments de chaînes d’isolateurs – Dimensions





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IEC 60120
Edition 4.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ball and socket couplings of string insulator units – Dimensions

Assemblages à rotule des éléments de chaînes d’isolateurs – Dimensions

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.080.10; 29.240.20 ISBN 978-2-8322-8475-9

– 2 – IEC 60120:2020 © IEC 2020
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Designated size of coupling . 7
5 Pin ball . 7
6 Socket . 7
7 Hook-on "GO" gauge . 7
8 Lower part of the insulator . 7
9 Locking device . 7
10 Dimensions of the pin ball. 8
11 Dimensions of the socket end . 9
12 Dimensions of the hook-on "GO" gauge . 10
13 Dimensions of twin-balled pins . 13
14 Dimensions of the hole for the split-pin . 13
15 Dimensions of the hole for the W-clip . 15
Annex A (informative) Extreme positions of the pin ball in the socket . 16
Annex B (normative) Recommended gauges . 18
Annex C (informative) Dimensions obtained by calculation. 35
Bibliography . 37

Figure 1 – Schematic of the pin ball . 8
Figure 2 – Schematic of the socket end . 9
Figure 3 – Schematic of the hook-on "GO" gauge . 10
Figure 4 – Schematic of twin-balled pins . 13
Figure 5 – Schematic of the hole for the split-pin . 14
Figure 6 – Schematic of the hole for the W-clip . 15
Figure A.1 – Sliding position of the pin ball (socket end) . 16
Figure A.2 – Over-tilting position of the pin ball in the socket end . 17
Figure B.1 – Schematic of ball part for pin ball . 19
Figure B.2 – Schematic of inspecting part for cap . 19
Figure B.3 – Schematic of pin "GO" gauge for ball height, shank diameter and shank
length . 20
Figure B.4 – Schematic of pin "GO" gauge for ball diameter . 22
Figure B.5 – Schematic of pin "NOT GO" gauge for ball height . 23
Figure B.6 – Schematic of pin "NOT GO" gauge for ball diameter . 25
Figure B.7 – Schematic of pin "NOT GO" gauge for shank diameter . 26
Figure B.8 – Schematic of socket "GO" gauge for entry height, entry width and neck
width . 27
Figure B.9 – Schematic of socket "GO" gauge for internal height and internal diameter . 29
Figure B.10 – Schematic of socket "NOT GO" gauge for entry height . 32
Figure B.11 – Schematic of socket "NOT GO" gauge for neck width . 34

Figure C.1 – Schematic of clearance between the pin ball and the socket end . 35
Figure C.2 – Effectiveness of locking the pin ball . 36

Table 1 – Dimensions of the pin ball . 8
Table 2 – Dimensions of the socket end . 9
Table 3 – Dimensions of the hook-on "GO" gauge . 11
Table 4 – Dimensions of twin-balled pins . 13
Table 5 – Dimensions of the hole for the split-pin . 14
Table 6 – Dimensions of the hole for the W-clip . 15
Table A.1 – Allowed deviation angle of pin . 16
Table A.2 – Allowed deviation angle of pin . 17
Table B.1 – Dimensions of pin "GO" gauge for ball height, shank diameter and shank
length . 21
Table B.2 – Dimensions of pin "GO" gauge for ball diameter . 23
Table B.3 – Dimensions of pin "NOT GO" gauge for ball height . 24
Table B.4 – Dimensions of pin "NOT GO" gauge for ball diameter . 25
Table B.5 – Dimensions of pin "NOT GO" gauge for shank diameter . 26
Table B.6 – Dimensions of socket "GO" gauge for entry height, entry width and neck
width . 27
Table B.7 – Dimensions of socket "GO" gauge for internal height and internal diameter. 30
Table B.8 – Dimensions of socket "NOT GO" gauge for entry height . 32
Table B.9 – Dimensions of socket "NOT GO" gauge for neck width . 34
Table C.1 – Clearance between the pin ball and the socket end . 35
Table C.2 – Effectiveness of locking the pin ball . 36

– 4 – IEC 60120:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
BALL AND SOCKET 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
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 accor
...

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