Why do power poles have 3 lines?

Because they carry 3-phase alternating current. When there are just 3 cables, the circuit is closed by ground. When there are 6 cables, it is a double-circuit power line. When there is a 4th cable, that is the ground cable and it is above the others, to protect them from lightning.

What are the benefits of underground power lines?

Burying lines eliminates fire hazards, accidents, safety risks, and power outages due to downed lines. This also reduces risks of health conditions related to electromagnetic radiation, and improves road safety by lessening the chances of motorists striking poles.

What are the big things on power lines?

Marker balls are colorful, spherical markers placed on power lines for the safety of low flying aircraft and to protect the electrical infrastructure. They allow the electrical wires to be noticeable (especially during times of low visibility or inclement weather) thanks to their bold colors.

What are the different lines on a power pole?

Utility poles are commonly used to carry two types of electric power lines: distribution lines (or “feeders”) and subtransmission lines. Distribution lines carry power from local substations to customers.

What are the benefits of power lines?

Reduces outages because buried lines are not susceptible to damage from high winds or falling trees. Looks better aesthetically. Generates a positive economic impact by reducing outage-caused downtime for local businesses. Can be coordinated with road repair activity to reduce excavation costs.

Why don’t electric companies bury power lines?

The main reason that utility companies will not bury power lines underground is cost. Research shows that the price for running a typical overhead power cable is approximately $100,000 per mile and that the price for burying those same wires underground would increase by 10 times or more.