The National Electrical Manufacturers Association (NEMA) published ANSI/NEMA C29.2A-2013
Wet Process Porcelain and Toughened Glass—Distribution Suspension Type
and ANSI/NEMA C29.2B-2013
Wet Process Porcelain and Toughened Glass—Transmission Suspension Type.
ANSI/NEMA C29.2A covers distribution suspension-type insulators 4.25 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.
C29.2A may be purchased in electronic or hardcopy format for $45.
ANSI/NEMA C29.2 B 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.
may be purchased in electronic or hardcopy format for $59.
Contents and scope of each standard may be viewed on the
NEMA is the association of electrical equipment and medical imaging manufacturers, founded in 1926 and headquartered in Rosslyn, Virginia. Its nearly 400 member companies manufacture a diverse set of products including power transmission and distribution equipment, lighting systems, factory automation and control systems, and medical diagnostic imaging systems. Total U.S. shipments for electroindustry products exceed $100 billion annually.
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