OMARK Obstruction Marking Sphere

Aviation obstruction marking sphere is designed to provide daytime visual warning or nighttime visual warning if comes with reflective tape, for electricity transmission line and overhead wire for aircraft pilots, especially cross river high voltage transmission lines. RedDot OMARK power line marker ball is made of high-grade Fiberglass Reinforced Plastics(FRP), diameter of 600mm and 800mm are available to meet different customers’ needs.

A marking sphere should be of one color such as aviation orange, white and red. Generally, the marking spheres are placed on the highest line. Where there is more than one line at the highest level, white and red, or white and orange spheres should be displayed alternately. This alternating color scheme provides the most conspicuity against all back ground.

Aircraft warning sphere-Powerline marker
Aircraft warning sphere-Powerline marker
Aircraft warning sphere-Powerline marker
Aircraft warning sphere-Powerline marker
Aircraft warning sphere-Powerline marker


Visable Distance 1200 meters
Voltage Range 35KV ~ 1000KV
Conductor Diameter 6.5-55mm
Mechanical structure
Color Orange, Red, White, Orange/White, Red/White
Sphere body FRP(Fiberglass Reinforced Polyester)
Cable clamp Aluminum alloy
Bolts/nuts/washers Stainless steel 304
Diameter 600mm / 800mm
Weight 6.9KG / 9.0KG
Thickness 3mm
Drain holes Yes
Optional • Preformed Armor Rods
• Reflective Strip
Warranty 2 Years


  • Fiberglass Reinforced Polymer durable material with better weather resistant
  • Super corrosion resistant character, stainless steel bolts and nuts
  • Aluminum alloy cable clamp guarantees good corrosion resistance
  • Various size of cable clamps are available to fit for customers’ cable conductor
  • Drain holes structure can prevent accumulated rain water inside the spheres
  • Stacking compatible design, save storage space and freight charge
  • Optional Preformed Armor Rods provide better protection against vibration and abrasion
  • Optional Reflective tape is more durable and economical solution for night visibility
  • Both sphere diameters of 600mm and 800mm are available


  • Power transmission Line
  • Overhead line
  • Guyed wire for self-supported guyed tower


  • ICAO Annex 14, 4th Edition, July 2004
  • FAA AC 70/7460-1K, obstruction Marking and Lighting

Order codes

Series Diameter Color Cable diameter(mm) Armor Rods Reflective Strip
OMARK 600mm O(Orange)
Cable diameter
800mm R(Red)

or Example, OMARK600O13.1AR means a 600mm diameter warning sphere, orange color, with preformed armor rods, suitable for diameter 13.1mm cable conductor.

Note :
For guarantee the spheres can fit for cable conductor well, customers need to provide cable diameter, cable material and code.


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Industry Solutions

(Aviation Obstruction Light)

  • Telecom & Broadcasting
  • Wind Turbine
  • Power transmission line
  • Tall building
  • Crane
  • Power Plant
  • Smoke stacks & chimney

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