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Technical requirement of Line Post Insulator (57-1):
1.Creepage distance: Min.356mm;
2.Cantilever strength: 12.5kN;
3.Colour of insulator glazed: Grey or Brown;
4.ANSI C29.1.
Technical requirement of Line Post Insulator (57-3):
1.Creepage distance: Min.737mm;
2.Cantilever strength: 12.5kN;
3.Cantilever proof load: 5kN;
4.Critical impulse flashover, positive: 210kV;
5.Colour of insulator glazed: Grey or Brown.
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