Why do wires need to be insulated?
Insulation resists electrical leakage, prevents the wire’s current from coming into contact with other conductors and preserves the material integrity of the wire by protecting against environmental threats such as water and heat.
The safety and effectiveness of the wire depend on its insulation..
Why is the voltage high in power lines?
The primary reason that power is transmitted at high voltages is to increase efficiency. As electricity is transmitted over long distances, there are inherent energy losses along the way. … The higher the voltage, the lower the current. The lower the current, the lower the resistance losses in the conductors.
Are overhead cables insulated?
Overhead insulated cables are rarely used, usually for short distances (less than a kilometer). Insulated cables can be directly fastened to structures without insulating supports. An overhead line with bare conductors insulated by air is typically less costly than a cable with insulated conductors.
Is living near power lines bad for your health?
It was found that children living in homes as far as 600 m from power lines had an elevated risk of leukemia. An increased risk of 69% for leukemia was found for children living within 200 m of power lines while an increased risk of 23% was found for children living within 200 to 600 m of the lines.
What is a safe distance to live from power lines?
This is called “Right of Way”. Right of way is an allowance of land around the power lines where no human habitation should be allowed. In most cases, it is the land 20-23 metres on both sides of the HT power transmission line. Power distribution laws dictate that this land is left alone.
Why are high power lines not insulated?
There’s no need to insulate them, because air doesn’t conduct very well, and where they meet the poles/pylons there are glass or ceramic insulators. Some conductors, such as those that feed individual houses are usually covered in insulation, because they are much more likely to be touched.