1.1 This standard specifies classes, shapes, dimensions and rating , coinposition and manufacture, requirements, packing, marking, sampling and criteria for conformity and tests .
1.2 Insulators in this standard shall be porcelain insulators, for use with overhead a.c.transmission line and may be adjusted for use with overhead d.c.transmission line.
1.3 This standard covers exclusively the pin-type insulators for use in the transmission and distribution of electric energy.