When OPGW optieal cable applied in the special designed power line with big distance,high fall 

and large angle,double strain clamps could be used.Helical double strain clamp adopts internal-layer,        

medium layer and external layer helical armor rod design.This structure improved tensile strength         

greatly and no limitation from line corner.The whole complete set of clamp includes:helical armor       

 rods,ground wire and assorted connector ete