ANSI 57‑1 Line Post Porcelain Insulator is a high‑strength vertical post insulator designed for 25kV overhead power distribution lines, fully compliant with ANSI standards for North American power grids. It delivers stable cantilever mechanical bearing capacity, long creepage distance and superior anti‑pollution insulation performance for pole‑mounted high‑voltage circuits.
## Core Parameters
Compliance Standard: ANSI, IEC, CE, ISO
Leakage Distance: 14 in (356 mm)
Dry Arcing Distance: 6 1/2 in (165 mm)
Cantilever Strength: 2,800 lbs (12.5 kN)
Routine Cantilever Test Load: 1,000 lbs (5 kN)
Rated Application Voltage: 25 kV
Low Frequency Dry Flashover Voltage: 80 kV
Low Frequency Wet Flashover Voltage: 60 kV
Positive Critical Impulse Flashover Voltage: 130 kV
Negative Critical Impulse Flashover Voltage: 155 kV
RMS Test Voltage to Ground: 15 kV
Max RIV at 1000kHz: 100 μV
