NEMA C29.2
NEMA C292 1992-JAN-01 nsulators - Wet-Process Porcelan and Toughened Glass - Suspenson Type-Supersedes ANS C2921992
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This standard covers suspension-type insulators, 4-1/4 inches (108 millimeters) in diameter and larger, made of wet-process porcelain or of toughened glass and used in the transmission and distribution of electrical energy.