That’s a good question, since the risk of damage or power outages is very real.
If you notice that a weak tree or branch risks damaging your home’s service loop and that you own the tree, you must rectify the situation. If the tree doesn’t belong to you, notify the owner of the risk it poses.
Warning: Tree pruning and felling are dangerous activities, especially when there are power lines nearby. Make sure you get a qualified arborist to do this work.