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Line post Insulators
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Catalog No. P57-1G P57-2G P57-3G
Dimensions (inches)
Leakage Distance 14 22 29
Dry Arcing Distance 6-1/2 9-1/2 12-1/4
Mechanical Values (Ibs.)
Cantilever Strength* 2,800 2,800 2,800
Electrical Values (kV)
Usual Line Voltage 25 35 45
Low Frequency Dry Flashover 80 110 125
Low Frequency Wet Flashover 60 85 100
Impulse Flashover, Positive 130 180 210
Impulse Flashover, Negative 155 205 260
Radio Influence Voltage Data
Test Voltage, RMS to Ground (kV) 15 22 30
Maximum RIV at 1000 kHz (µV) 100 100 200
Packing & Shipping Data
Net Weight Each (Ibs.) 14.3 19.1 26.3
Packed Weight Each (Ibs.) 17.6 23.9 30.6
Standard Package Quantity 4 3 3
*Maximum Recommended Working Load = 40% of Cantilever Rating

ANSI - 70 Gray Glaze is standard.

Print Specification

Line Post Insulators (PDF, 142K)

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  • Suspension Insulators

  • Spool Insulators

  • Strain Insulators

  • Low Voltage Pin Type Insulators

  • High Voltage Pin Type Insulators

  • Line Post Insulators

  • Station Post Insulators

  • Suspensions