ANSI 57-1L-1 Porcelain Line Post Insulator-IEC Standard Testing Specification.
Descriptions:
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Line post insulators shall conform in all respects to the requirements of ANSI standard. Metal parts shall be made of a good commercial grade of malleable iron, ductile iron, steel, or aluminum. Ferrous parts, other than stainless steel, shall be galvanized in accordance with ASTM A153.
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Competitive advantages: