Shackle type insulator with neat sketch:
* These insulators are clamped to the cross arms by one metal ‘U’ clamp with the help of bolts, nuts & washers.
* Function of Shackle insulator is to reduce excessive tension on line. Also on supporting structure (pole).
1) Shackle insulators are used in following circumstances when line is subjected excessive tension. E.g. shackle insulators are used below 11 KV line & above 11 KV line strain insulators are used
2) Shackle insulators are also used when line is going straight but in case of vertical conductor configuration only