LB-AWS Aerial marker balls Overhead wire markers

According to the International Civil Aviation Organization (ICAO) Annex 14 International Standards and Recommended Practices — Aerodromes, and relevant national regulations, overhead power lines — especially ultra‑high voltage (500 kV) transmission cables and cross‑river cables — should be equipped with conspicuously shaped aviation marker balls (aviation warning spheres) to provide warning indications.

LB-AWS Aerial marker balls Overhead wire markers-Specifications