IEC 60120:1984

FOREWORD
PREFACE
Clause
1 Scope
2 Object
3 Plan of the standard
4 Pin ball
5 Socket
6 Hook-on 'GO' gauge
7 Lower part of the insulator
8 Locking device
9 Dimensions of the pin ball
10 Dimensions of the socket end
11 Dimensions of the hook-on 'GO' gauge
12 Dimensions of twin-balled pins
13 Clearance between the pin ball and the socket end
14 Effectiveness of locking the pin ball
15 Dimensions of the hole for the split-pin
16 Dimensions of the hole for the W-clip
APPENDIX A - Sliding position and over-tilting
             position of the pin ball in the socket end
APPENDIX B - Recommended gauges

Applies to string insulator units of the cap and pin and long rod types and their associated metal fittings for overhead lines. Includes six standard sizes designated by the nominal pin diameters which form the basis of the standard. Defines each standard size by the dimensions of the pin ball, of the socket and the hook-on 'Go' gauge. States dimensions of twin-balled pins for coupling of two sockets. Tabulates clearance and locking conditions. Appendices give information on extreme positions of the pin ball in the socket as well as on gauges for checking dimensions.