ANSI/NEMA C29.2A covers distribution suspension-type insulators 4.25–8 in. in diameter, made of wet-process porcelain or of toughened glass, and used in the distribution of electrical energy. ANSI/NEMA C29.2B covers transmission suspension-type insulators 9 in. in diameter and larger, made of wet-process porcelain or of toughened glass, and used in the transmission of electrical energy. Contents and scope of each standard may be viewed on NEMA website.
This story is related to the following:Trade Associations