ANSI/NEMA C29.12-2013 specifies composite suspension (tension) insulators with minimum section length of 46 in., while ANSI/NEMA C29.17-2013 specifies composite transmission line post type insulators with section lengths 41 in. or greater. Lastly, ANSI/NEMA C29.18-2013 specifies composite distribution line post type insulators with section lengths 30.6 in. or less. All insulators addressed by standards are intended for use on overhead lines for electric power systems.
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