ZS-Solid Core Post Insulators;ZSX-Catanary Post Insulators;C-Operation Post Insulators;W-Mgbochi mmetọ ụdị;Numerator after frist"-"-Rated Voltage;Denominator-Catilever Ọdịda Ibu;N-Torsion Ịda Ibu;L- Ngwunye ala na nke kachasị elu nwere Screw Hole; Data mgbe nke abụọ gasịrị "-"-Klas nke ọkwa mmetọ.
