ANSI 57-5S 57-5L Glazed Porcelain Line Post F Neck Insulator
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... shall be made of good commercial-grade wet-process porcelain. The entire surface of the insulator, with the exception of a firing surface, shall be glazed. If gray is required, it shall be in accordance with ANSI Z55.1-1967 (R1973). Metal parts shall be...
Changsha Power Electric Co.,Ltd.
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