DX8001A Water Diffusion Test Machine 1. Reference Standards GB/T 19519-2014, Insulators for overhead lines – Composite suspension and tension insulators for a.c. systems with a nominal voltage greater than 1000 V – Definitions, test methods and acceptance criteria GB/T 22079-2008, Polymeric insulators for indoor and outdoor use with a nominal voltage greater than 1000 V – General definitions, test methods and acceptance criteria Guidelines for Power Grid Material Inspection