FRP Aircraft Warning Sphere – High Voltage Power Line Marker Ball

Fiberglass warning sphere ball, also named FRP aircraft warning marker ball / power line aerial warning sphere, is a hollow spherical aviation obstruction marker made of fiberglass reinforced polyester (FRP/GRP). It is fixed onto overhead power cables, guy wires and communication lines to mark thin, hard-to-spot overhead conductors, reminding low-flying helicopters, small aircraft and drones to avoid collision risks. 

Raw Material & Structure of fiberglass Sphere Ball： 

Sphere Body:

High-strength FRP (fiberglass reinforced plastic), wall thickness standard 3.0mm, two half-sphere snap-fit assembly structure

Mounting Fittings:

Cable clamp: Die-cast aluminum alloy (light, conductive isolation, corrosion-proof)

Fasteners: SUS304 stainless steel bolts, nuts, washers

Auxiliary armor rods for cable protection (optional)

Internal Design:

Built-in drain holes to eliminate rainwater accumulation, avoid extra load weight on power lines

Standard Technical Specifications：

Standard Diameter: 400mm, 600mm, 800mm (custom sizes acceptable)

Weight: 5–10kg (600mm ≈5.5 kg)

Visible Distance: Up to 3000m in daylight; reflective tape optional for night visibility

Operating Temperature: -55℃ ~  75℃, adapts to cold plateau, coastal salt fog and tropical high-temperature areas

Applicable Cable Diameter: 6.5mm–55mm, fits 10kV–1100kV ultra-high voltage lines

Service Lifespan: ≥20 years maintenance-free outdoor service

Standard Colors: Orange & White split, Red & White split, solid orange, solid red, solid white

Product Advantages:

Lightweight & High Strength:

FRP density is only 1/4 of steel, strong tensile and impact resistance. Minimal extra load on power lines, no negative influence on line tension and sag, perfect for long-span river-crossing transmission lines.

Full Electrical Insulation:

Non-conductive fiberglass body eliminates short-circuit and leakage risks on high-voltage circuits, safe for EHV grid operation.

Super Weather & Corrosion Resistance:

Gel coat surface resists UV radiation, acid rain, salt spray and industrial chemical fumes; no cracking, aging or rust compared to plastic and metal marker balls.

Wind & Impact Resistant:

Reinforced hollow sphere structure withstands strong gale up to 240km/h, anti-bird strike and floating debris collision.

Fast On-site Installation:

Split two-piece design, quick bolt assembly without power cut; universal clamps match most overhead cable models.

Customization Support:

Custom sphere size, color matching, reflective sticker, brand logo printing and tailored clamp sizes for special engineering projects.

Wide Application Scenarios:

1. Extra-high voltage overhead transmission lines (cross rivers, valleys, highways, railways)

2. Airport approach zones, helicopter flight paths and military low-altitude airspace

3. Guy wires and stay cables of power transmission towers & communication masts

4. Overhead pipeline supports, construction crane cables

5. Coastal, mountain and plateau low-altitude flight hazard zones