(1) In the course of construction and for the more effective working of the undertaking, the Company may enter upon and remove from any public or private land, any tree or any branch, bough or other part of a tree growing on such land within 100 feet of any electric line and which may tend to interfere with, endanger or otherwise prejudicially affect the working of the undertaking; but the Company may not, except with the consent of the owner or occupier of such land, enter upon any private land under this section until after the expiration of 15 days' notice in writing given to the owner or occupier thereof or posted up conspicuous thereon.