The meaning behind those colorful balls on power lines

A Rainbow of Safety: The Story Behind the Balls on Power Lines - EnergyBot

What's With The Orange Balls That Hang From Power Lines In Colorado's Canyons?

What are those colorful balls really for?, Local News

Why Can't Texas Just Bury Its Electrical Lines? – Texas Monthly

What are the things called that are like giant balls attached to electrical wires running between telephone poles or electrical towers? What is their purpose? - Quora

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What Are Those Colorful Balls on Power Lines, Exactly?

What's With The Orange Balls That Hang From Power Lines In Colorado's Canyons?

Transmission tower - Wikipedia

Why colorful Balls used on Power Lines? What is aerial marker ball in Transmission line