Pin Post Insulator 56/57-4

Pin Post Insulator 56/57-4

The following line post insulators comply with the ANSI Standard. The glaze colors of the insulators are brown or light gray.


Diameter (D): 7 1/2 Inches (190mm)

Height (H): 17 Inches (432mm)

Leakage Distance: 37 1/2 Inches (953mm)

Dry Arcing Distance: 19 Inches (483mm)

Mechanical Values:

Cantilever Strength: 2,800Pounds (12.5kN)

Cantilever Strength Routine Test: 1,000Pounds (5kN)

Electrical Values:

Typical Application Voltage: 35kV

Low Frequency Dry Flashover Voltage: 140kV

Low Frequency Wet Flashover Voltage: 95kV

Critical Impulse Flashover Voltage, Positive: 225kV

Critical Impulse Flashover Voltage, Negative: 300kV

Radio Influence Voltage Data:

Test Voltage RMS to Ground: 44kV

Maximum RIV at 1000 kHz: 200μV

Packing and Shipping Data

Net Weight, Approximate: 17.5kg