Helical rods: Aluminium-clad steel
Additional informationProtection rods are preferably made of Aluminium-clad steel-wires and shall protect the self supporting fibre optical aerial cables at tension sets. They are mounted beneath the helical dead end and spread the radial forces on the cable uniformly along the zone of contact. Especially on the cable at the loop-side of the helical dead end radial forces (depending on the tension force) can stress the optical part of the cable inadmissibly. This will cause high damping which results in a reduced data transmission or in the worst case an interruption. The length of the cable guard is determined in such a way that two vibration dampers can be mounted on the rods at the span-side avoiding that the damper clamp is stressing the optical part of the cable. For optical fibre aerial cables with right-hand outer layer, cableguards with left-hand layer are always used in order to avoid a torsion of the cable by the helical dead end with right-hand layer. A torsion of the aerial cable is causing an enlenghtening leading to a destruction of the optical part of the cable.
Helical rods: Aluminium alloy
Additional informationCable guards protect the ADSS cables at the tension assembly. They are mounted under the helical dead end and reduce the radial forces in the cable - especially at the loopside of the dead end. Radial forces (depending on the tension force) can stress the optical part of the cable inadmissibly. This can cause high damping in the optical fibre. This results in a high signal damping in the optical fibre up to an interruption of the optical transmission.
Mechanical tasksReduzieren auf das Luftkabel einwirkende Querkräfte, und vergrößern - durch die erhöhte Biegesteifigkeit - den Biegeradius des Luftkabels
Helical rods: Steel, h.d.g
Additional informationProtection rods are preferably made of steel, h.d.g. and shall protect the self supporting fibre optical aerial cables at tension sets. They are mounted beneath the helical dead end and spread the radial forces on the cable uniformly along the zone of contact. Especially on the cable at the loop-side of the helical dead end radial forces (depending on the tension force) can stress the optical part of the cable inadmissibly. This will cause high damping which results in a reduced data transmission or in the worst case an interruption. The length of the cable guard is determined in such a way that two vibration dampers can be mounted on the rods at the span-side avoiding that the damper clamp is stressing the optical part of the cable. For optical fibre aerial cables with right-hand outer layer, cableguards with left-hand layer are always used in order to avoid a torsion of the cable by the helical dead end with right-hand layer. A torsion of the aerial cable is causing an enlenghtening leading to a destruction of the optical part of the cable.