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ANSI/NEMA C29.2B-2013 (R2023)
Insulators - Wet Process Porcelain and Toughened Glass - Transmission Suspension Type
Covers transmission suspension-type insulators, 9 inches (228.6 millimeters) in diameter and larger, made of wet-process porcelain or of toughened glass and used in the transmission of electrical energy.
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NEMA: National Electrical Manufacturers Association [nema]