1. Determine the operating voltage peak and effective value;

2. Determine the equipment's supply voltage and the type of power supply facility;

3. According to the over-voltage category to determine the size of the transient over-voltage into the device;

4. Determine the pollution level of the equipment to install the right polymer overhead insulator.

5. Determine the type of insulation across the gap (functional insulation, basic insulation, supplementary insulation, reinforced insulation).

Gaoneng always bring customers high quality polymer overhead insulator.