Overhead Wire Marker Fiberglass Aircraft Warning Sphere Day Marking Aerial Marker Balls for High Voltage Power Lines

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Overhead Wire Marker Fiberglass Aircraft Warning Sphere Day Marking  Aerial Marker Balls for High Voltage Power Lines 

Warning sphere is used for warning aircraft pilots in daytime and nighttime, which is compliant with International Civil Aviation Organization (ICAO) recommendations annex 14 chapter 6. It can be used in overhead cable, guyed wire, especially in extra high voltage power transmission line, cross river power transmission line, cross road, bridge power transmission line and so on. It is made of high-grade polyethylene with the color of red, orange, white. Different colors' warning sphere should be displayed alternately. If there are many lines, warning sphere should be displayed on the highest line. It can resistant to corrosion, rust, water, dust, high temperature, can be used for long time.

For more details:

  • HUNAN CHENDONG TECH CO., LTD
  • Tel:  +0086-0731-85563265                                   
  • Fax: +0086-0731-85563365
  • Phone/WhatsApp:  +0086-13929493960               
  • Skype:  sophia.guo88
  • Email:  sophia@chendongtech.com                        
  • Website:  http://www.cdt-en.com/  

Warning sphere specification

  • Sphere body material: high-grade polyethylene.
  • Color: aviation red, aviation orange, aviation white.
  • Sphere diameter: 600 mm, 800 mm
  • Thickness: 3 mm.
  • Weight: 6.9kg / 9kg
  • Visible distance: 1250 m from the air and 350 m from the ground.
  • Voltage range: 35KV-1000KV
  • Conductor diameter: 6-32mm.
  • Reflective strip: optional.
  • Preformed armor rods: optional.
  • Warranty: 2 years.
  • Packaged in carbon box or wooden box.

Standard

  • ICAO Annex 14, 6th Edition, July 2013. Annex 14 to the Convention on International Civil Aviation.
  • FAA AC 70/7460-1L, obstruction Marking and Lighting.
  • Date Issued: December 04, 2015.
  • Responsible Office: AJV-1, Airspace Service.
  • Description: This Advisory Circular (AC) sets forth standards for marking and lighting obstructions that have been deemed to be a hazard to navigable airspace.

Why overhead wires should install warning sphere?

Warning sphere is the landmark installed on high voltage overhead wires used for nighttime high voltage warning. It is the newest high voltage warning equipment, its performance keeps ahead level through national authority testing. It installs on overhead power lines directly, marked color make people and vehicles find the power lines early and take measures to prevent, further to decrease high voltage power lines safety accidents.




























Features of obstruction marking sphere
  • Resistant to weather, high temperature, water, dust.
  • UV, ozone, sunlight, attack resistance.
  • Stable color, not fade, recyclable.
  • Not make noise in windy day.
  • Light but durable, properties do not change under complex environment.
  • Clamp, bolt and nut can resistant to corrosion.
  • Drain holes can prevent rain accumulating in the sphere.
  • Stacking compatible design can save storage space and transportation cost.
  • Optional preformed armor rods can decrease vibration and abrasion for the conductors.
  • Reflective tape can ensure night visibility.
  • Easy to install.
  • Once installed, used for a long time.

Application of obstruction marking sphere
  • Used in overhead conductors, supporting towers, high-rise transmission lines, EHV (500,00 kV) transmission cables, communication wires to warn low flying airplanes and helicopters.
  • Warning spheres are applied near airports and on elevated spans crossing rivers, lakes, fjords, valleys, roads, railways, construction sites and pipelines.
  • Warning spheres are also applied near military bases, police stations, hospitals, helicopter routes and other low flying areas.
Installation of obstruction marking sphere



1. Take out the marking spheres from box. The half with insulated strips is lower hemisphere and the other is the upper one.
Each box generally packs three sets of marking spheres. Match one complete set of the marking sphere with the same number (eg: Number"2") printed on clamp.
2. Install preformed armor rods to conductor, make sure wrapping armor rods have the same direction with conductors.

3. Fix the lower hemisphere to the power line: tie up insulated strips on the power line, make sure the conductor with armor rods can right attach with clamp slots. Make sure the armor rods out of clamps on both sides with equal length which is about 20-30 cm.

4. Assemble the upper half with the lower half. In order to make sure groove and comb fit perfectly, please align clamp printed with the same number (eg: Number"2") on one side of each half.

5. Insert hex bolts, hex nuts, flat washers, spring washers into cable clamps on both sides.

6. Use suitable adjustable wrench to fix hex nuts.

Obstruction marking spheres installation note
  • The spacing between two consecutive marking spheres or between a marking sphere and a supporting tower should be appropriate to the diameter of the marking sphere.
  1. The maximum spacing is 30 m with sphere's diameter is 600 mm.
  2. The maximum spacing is 35 m with sphere's diameter is 800 mm.
  3. The maximum spacing is 45 m with sphere's diameter is 1300 mm.
  • If multiple wires or cables are involved, marking sphere should be located in the highest wire.
  • When installed, different colors' marking spheres should be displayed alternately. The color selected should contrast with the background to ensure marking spheres will be seen clearly.
  • Obstruction marking spheres should alternate aviation orange, white, yellow, with aviation orange markers positioned at each end.
  • If less than four markers are on the line, all markers should be aviation orange.


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