ZS-Solid Core Post Insulators;ZSX-Catanary Post Insulators;C-Operation Post Insulators;W-Anti-pollution Type;Numerator after frist"-"-Rated Voltage;Denominator-Catilever Failing Load;N-Torsion Failing Load;L- Ang Ubos ug Top Fittings tanan adunay Screw Hole;Data pagkahuman sa ikaduha"-"-Klase sa Antas sa Polusyon.