International Standards and Conformity Assessment for all electrical, electronic and related technologies



Reference HD 474 S1:1986
Title Dimensions of ball and socket couplings of string insulator units
Project Number 3764
Abstract/Scope 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.


Current Stage code 6060
Current Stage code date 1986-09-05
Current Stage code deadline 1987-07-01
Deadline date for vote  


Order Voucher  


IEC Technical Body IEC/SC 36B
Reference Document IEC 60120:1984 (EQV)
Keywords Insulator; String insulator unit; Ball and socket coupling; Dimensions
Note Document prepared by CLC/TC 36B disbanded at 91 BT
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 1986-09-05 1987-07-01 export to doc file  EN
5099 1986-06-26 1986-07-31  
5020 1986-02-17 1986-05-31  
1520 1985-07-25 1985-10-31  

Implementation Dates

date of Ratification (DOR) (1) 1986-06-26
date of Availability (DAV) (2) 1986-09-05
date of Announcement (DOA) (3) 1987-01-01
date of Publication (DOP) (4) 1987-07-01
date of Withdrawal (DOW) (5) 1987-07-01


Superseded by  
Normative reference (6)  

(1) Date of ratification (dor) date when the Technical Board notes the approval of an EN (and HD for CENELEC), from which time the standard may be said to be approved

(2) Date of availability (dav) date when the definitive text in the official language versions of an approved CEN/CENELEC publication is distributed by the Central Secretariat

(3) Date of announcement (doa) latest date by which the existence of an EN (and HD for CENELEC), a TS or a CWA has to be announced at national level

(4) Date of publication (dop) latest date by which an EN has to be implemented at national level by publication of an identical national standard or by endorsement

(5) Date of withdrawal (dow) latest date by which national standards conflicting with an EN (and HD for CENELEC) have to be withdrawn

(6) This list of normative references is purely indicative. The only official list of normative reference is the list of the published standard.