IEC 60120:2020 pdf free download

IEC 60120:2020 pdf free download Ball and socket couplings of string insulator units – Dimensions (IEC 60120:2020)
1scope
The object of this international standard is to define the dimensions of a series of standardball and socket couplings using the standard locking devices (see lEC 60372) in order topermit the assembly of insulators or metal fittings supplied by different manufacturers.
This document applies to string insulator units of the cap and pin and long rod types and theirassociated metal fittings.
For the pin ball and the socket,dimensions apply to the finished product after any surfacetreatment.
Extreme positions of the pin ball in the socket are given in Annex A.
Typical examples of gauges for checking the dimensions of pin balls and sockets are given inAnnex B.
NOTE Only the dimensions necessary for assembly are dealt with in this standard.Properties of material andworking loads are not specified.The co-ordination of dimensions with strength classes is specified in lEC 60305and lEc 60433.
2 Normative references
The following documents are referred to in the text in such a way that some or all of theircontent constitutes requirements of this document. For dated references，only the editioncited applies.For undated references, the latest edition of the referenced document (includingany amendments) applies.
IEC 60050-471:2007, International Electrotechnical Vocabulary (IEV) – Part 471: Insulators
IEC 60372,Locking devices for ball and socket couplings of string insulator units -Dimensions and tests
3 Terms and definitions
For the purposes of this document,the terms and definitions of lEC 60050-471,some ofwhich are reproduced below for ease of reference, apply.
ISo and lEC maintain terminological databases for use in standardization at the followingaddresses:
IEC Electropedia: available at http://www.electropedia.orgl
Iso Online browsing platform: available at http://www.iso.org/obp
3.1
ball and socket coupling
coupling consisting of a ball, a socket and a locking device, and providing flexibility
4 Designated size of coupling This document includes eight standard ball and socket couplings designated by the nominal pin diameters in millimetres. Each designated size of coupling is defined by the dimensions of the pin ball, of the socket, of the hook-on “GO” gauge, of the lower part of the insulator and of the corresponding locking device. NOTE Dimensions of twin-balled pins for coupling of two sockets are stated in Clause 1 3. Dimensions of the hole for the locking devices are stated in Clause 1 4 and Clause 1 5.
5 Pin ball The pin ball shall conform to the dimensions specified in Clause 1 0. The main dimensions governing the shape of the pin ball are h 1 , d 2 , r 1 and r 2 . Dimension r 3 is given for guidance because its accurate value may be obtained only by the drawing. In addition, the shank diameter d 1 , must not exceed the specified values within a length equal to H 3 of the corresponding worn hook-on “GO” gauge (see Clause 1 2).