Available for download and in hard copy ANSI/NEMA C29.5-2015 American National Standard for Wet-Process Porcelain Insulators—Low- and Medium-Voltage Types covers low- and medium- voltage line-type insulators made of wet-process porcelain and used in transmission and distribution of electrical energy. Published by NEMA, this revision includes changes to sampling sizes, glaze and color requirements, units of measurement, and marking and packing requirements.