ANSI 57-2 porcelain line post insulator is made of good commercial-grade wet-process porcelain. Like other tie-top line post insulator products, it is used with long spindle or short spindle.

ANSI C29.7 is American National Standard for wet process porcelain insulators high voltage line post type. The base threading data of ANSI 57-2 porcelain line post type insulator is 3/4-10 unified form-special pitch, dia. 0.7077-0.7000, length of engagement 0.875. Top wire groove shall seat a 1-15/16-inch diameter mandrel and side-wire groove shall seat a 1-15/16-inch diameter mandrel.

ANSI 57-2 porcelain line post insulator parameters:

ANSI 57-2 porcelain line post type insulator ultrasonic tests: Orient checks each and every porcelain core. An ultrasonic pulse is sent through the column of porcelain. If an internal defect is found in the porcelain line post insulators, it is rejected. This test is an integral part of our in-plant quality control system.

In addition to Low-frequency dry flashover test and Low-frequency wet flashover test, Critical impulse flashover tests-positive, radio-influence voltage test and thermal shock test belong to ANSI 57-2 porcelain line post type insulator design tests, too.
 

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