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ANSI/NEMA C29.2A-2020
Insulators - Wet Process Porcelain and Toughened Glass - Distribution Suspension Type
Covers distribution suspension-type insulators, 4-1/4 inches (108 millimeters) to 8 inches (203 millimeters) in diameter, made of wet-process porcelain or of toughened glass and used in the distribution of electrical energy.
NEMA: National Electrical Manufacturers Association [nema]