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
The National Electrical Manufacturers Association (NEMA) represents nearly 350 electrical equipment and medical imaging manufacturers at the forefront of electrical safety, reliability, and resilience, as well as efficiency and energy security. Our combined industries account for 360,000 American jobs in more than 7,000 facilities covering every state. Our industry produces $106 billion shipments of electrical equipment and medical imaging technologies per year with $36 billion exports.