This standard stipulates multi-corrugated post insulators (hereinafter referred to as insulators) made of porcelain or glass used for supporting conductors and electrical appliances such as disconnectors in indoor electrical circuits with a nominal voltage of 3.3 kV to 33 kV. Applies to insulators. a) Porcelain insulators previously specified by JIS.Specified in the main body of this standard. b) Indoor post insulators made of porcelain or GAPSU for systems with a nominal voltage ratio exceeding 1000V as specified in IEC 60273:1990 and specified in the Annex (Regulations) of this standard. Note that either the main body or annexes (regulations) of this standard shall be applied consistently to a single product. Corresponding provisions and contents of both may be selected or mixed as appropriate. I can't.