ZS-Solid Core Post Insulators; ZSX-Catanary Post Insulators; C-Kev Ua Haujlwm Post Insulators; W-Anti-pollution Hom; Tus lej tom qab frist "-"-Rated Voltage; Tus nqi-Catilever Failing Load; N-Torsion Failing Load; L- Hauv qab thiab sab saum toj yog tag nrho nrog Screw Qhov; Cov ntaub ntawv tom qab thib ob "-"-Class of Pollution Level.
