Tie Top Line Post Insulator ANSI 57-4

Tie Top Line Post Insulator ANSI 57-4

The following line post insulators comply with the ANSI Standard. The glaze colors of the insulators are brown or light gray. The dimension of neck for 57-1, 57-2, 57-3 is in accordance with "F". The dimension of neck for 57-4, 57-5 is in accordance with "N".


Diameter (D): 7 Inches (178mm)

Height (H): 17 Inches (432mm)

Leakage Distance: 40 Inches (1015mm)

Dry Arcing Distance: 14 1/2 Inches (368mm)

Mechanical Values:

Cantilever Strength: 2,800Pounds (12.5kN)

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

Electrical Values:

Typical Application Voltage: 55kV

Low Frequency Dry Flashover Voltage: 150kV

Low Frequency Wet Flashover Voltage: 125kV

Critical Impulse Flashover Voltage, Positive: 255kV

Critical Impulse Flashover Voltage, Negative: 340kV

Radio Influence Voltage Data:

Test Voltage RMS to Ground: 44kV

Maximum RIV at 1000 kHz: 200μV

Packing and Shipping Data:

Net Weight, Approximate: 16.0kg