The grooves are made of high resistance nylon sectors, according to IEC TR 61328. This hard surface has several advantages that prevent damages on the OPGW, the most important are:

• Low torsional stress resulting in no birdcaging risk.
• Smooth self-alignment of the cable at the bottom of the groove.
• No need to change conductor reeving direction according to cable formation.

• AFS303, in addition to all the advantages related to the hard surface (see the previous box), allows the max. precision level during reconductoring operations:
• The pull pre-setting system controls the stringing tension with high precision (+-5% accuracy).
• Single drive pinion transmission ensures same speed of the bull-wheels while torque value can be different. This prevents slippage or overloads on the cable.

• The best solution for live line replacement of Earth Wire/OPGW with OPGW and safety nets on critical crossing.
• High speed and pulling capacity for:
  • Heavy operations execution, such as safety nets and longer span.
  • Operating times reduction.

• The combination of the OPGW anti-twisting devices RFF and the clamp for fiber optic MOF model guarantees the best protection from the torque preventing all the risks related to its damage.
• RFF is specifically designed to connect the pulling rope with an OPGW: its two arched rods facilitate the overtake of the blocks and two counterweights avoid cable twisting.
• The clamp model MOF has special liners shaped on the exact OPGW external diameter.