Which type of pole is commonly used for overhead power lines?

Wooden utility poles are the most commonly used type of pole for overhead power lines due to several important factors. Firstly, they are lightweight compared to materials like concrete and metal, making them easier to transport and install. Secondly, they have excellent insulating properties, which helps prevent electrical conduction and enhances safety for both workers and the public.

Additionally, wooden poles are cost-effective and have a good strength-to-weight ratio, allowing them to support the weight of the lines and any additional equipment such as transformers and insulators. Their natural flexibility provides a degree of resilience against wind and other environmental forces, reducing the risk of breakage.

While concrete and metal poles are also used in certain situations, such as in areas prone to high winds or where increased structural strength is necessary, they often come with higher costs and installation complexities. Plastic poles, on the other hand, are not commonly used for high-voltage applications due to their lower mechanical strength compared to wooden, concrete, or metal poles. Thus, the extensive use of wooden utility poles is rooted in their practical advantages in the context of overhead power lines.