ANSI Standard 57-4 Line Post Insulators are made from high quality non porous electrical porcelain and galvanized ferrous end fittings which provide long life over a wide range of environmental conditions as like ceramic line post insulator.

ANSI Standard 57-4 Line Post Insulators properties:
The high-tension transmission wires we see stringing from tower to tower are bare and carry a load of 1000 kV or more. The air does a good job of insulating them, but they need to be insulated at the touch points, for example, at the tower pylon supports and where they enter buildings, etc. Traditionally, quartz-based ANSI Standard 57-4 Line Post Insulators have been used, but they are susceptible to microcracking. Although considered old, these materials for porcelain line post insulator are actually high-tech in terms of production, reliability, and durability.

High-voltage porcelain line post insulator with high corundum content is much more reliable than the quartz-based ones. High-voltage ANSI Standard 57-4 Line Post Insulators are subject to electrical stresses, mechanical stresses, thermal shock stresses and attack from environmental factors, such as pollution.

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