This standard specifies station-boss insulators (hereinafter referred to as insulators) made of porcelain or glass used for support of conductors and disconnectors in electrical circuits with a nominal voltage of 6.6 kV or higher, and applies to the following insulators. a) Porcelain insulators, which were previously specified by JIS, are specified in the main body of this standard. b) Porcelain or glass outdoor post insulators for systems with a nominal voltage exceeding 1000 V as specified in IEC 60273:1990, as specified in the Annex (normative) to this standard. Note that either the main body or the annexes (regulations) of this standard shall be applied consistently to a single product, and the corresponding provisions and contents of both may be selected or mixed as appropriate. I can't.