Insulators
ANSI 57-1 Gray Porcelain Line Post Insulator
Product Overview
Gray ANSI 57-1 porcelain line post insulator with 356 mm creepage distance and 12.5 kN cantilever strength.
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Technical Parameters
| Parameter | Unit | Value |
|---|---|---|
| ANSI class | 57-1 | |
| Top groove diameter | mm | 73 ± 3 |
| Porcelain body diameter | mm | 140 ± 5 |
| Overall height | mm | 229 ± 8 |
| Creepage distance | mm | 356 |
| Cantilever strength | kN | 12.5 |
| Low-frequency dry flashover | kV | 70 |
| Low-frequency wet flashover | kV | 50 |
| Positive critical impulse flashover | kV | 120 |
| Negative critical impulse flashover | kV | 155 |
| RIV test voltage to ground | kV | 15 |
| Maximum radio influence voltage | µV | 100 |
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