This is a paid asset, but now you can download PowerLines for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
“If possible, please buy the package to support the developer”
This tool helps you to create power lines. Now you don’t need to use 3ds max or blender to create wire. Wires will be generated easily in the unity editor. Also, it uses LOD technique to have a faster rendering process, it is effective in huge scenes.
This asset contains some examples that you can use in your project. You can use your own models too.