BS 3288-4:1989 - Insulator and conductor fittings for overhead power lines - Locking devices for ball and socket couplings of string insulator units: dimensions and tests
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BS 3288-4:1989, titled "Insulator and conductor fittings for overhead power lines – Locking devices for ball and socket couplings of string insulator units: dimensions and tests," specifies the shapes, standard dimensions, and test methods for locking devices used in ball and socket couplings of string insulator units. It also outlines acceptance conditions of supply and provides additional dimensions for manufacturing guidance.
The standard is structured into three main sections:
General: Covers the scope, objectives, and the overall structure of the standard.
Dimensions and General Rules: Details the shapes of locking devices, standard dimensions for split-pins (both standard and alternative types), additional manufacturing dimensions, dimensions for W-clips, and guidelines on the proper usage of these locking devices.
Tests: Classifies the various tests applicable to these locking devices to ensure they meet the required specifications
Split pins; Bend testing; Dimensions; Gauges; Testing conditions; Ball joints; Shape; Electric power transmission lines; Qualification approval; Electric insulators; Overhead power lines; Quality control; Sampling methods;
Statistical quality control
BS 3288-4:1989 - Insulator and conductor fittings for overhead power lines - Locking devices for ball and socket couplings of string insulator units: dimensions and tests
