BS 3288-3:1989 - Insulator and conductor fittings for overhead power lines - Dimensions of ball and socket couplings of string insulator units
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BS 3288-3:1989, titled "Insulator and conductor fittings for overhead power lines – Dimensions of ball and socket couplings of string insulator units," specifies the standard dimensions for ball and socket couplings used in string insulator units of cap and pin and long rod types, along with their associated metal fittings. The standard aims to ensure compatibility and interchangeability of insulators and fittings from different manufacturers by defining a series of standard couplings that utilize standard locking devices, as detailed in BS 3288-4
Electric insulators; Ball joints; Electric power transmission lines; Electric power transmission; Overhead power-line fittings; Gauges; Dimensions; Overhead power lines