Aircraft Warning Device (Sphere) - visual marking of overhead power lines crossing fjords, valleys and rivers or generally where there is a need to make power lines visible to aircraft and helicopters

 Aircraft Warning Device (Sphere) -  visual marking of overhead power lines crossing fjords, valleys and rivers or generally where there is a need to make power lines visible to aircraft and helicopters.

The Warning Spheres marker ball are attached on the uppermost conductors, shieldwires or on the top of power line towers.

The warning device consist of two hemispheres attached to the overhead conductor by two bolted clamps. The key element of the Warning Sphere is UV and ozone resistant material polyethylene.

The special installation mechanism allows a single linesman to easily install the Warning Sphere. Moreover a properly designed clamp structure avoids deformation of the sphere material due to tightening of the bolts. Due to the application of a stainless steel safety plate, clamp loosing is impossible. The high rigidity of the spheres prevents acoustic noises including rattle between the two hemispheres and vibration fatigue problems, for the whole life time of the overhead conductor on which they are installed. The Aviation Warning Spheres fulfill the requirements of the International Civil Aviation Organization (ICAO) guidelines for marking obstacles.

Warning spheres must be visible in daylight at a distance of minimum 1500 meter from all inflight angles. Specific requirements to dimensions and distance between the warning spheres apply. All warning spheres must have a reflective surface.

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