Tree Pruning Guidelines

For our distribution system (lower voltage) lines, NPPD adheres to tree pruning practices set forth in the American National Standards Institute (ANSI) A300, Standard Practices for Trees, Shrubs and Other Woody Plant Maintenance, which is endorsed by the National Arbor Day Foundation, the International Society of Arboriculture, and the Tree Care Industry (formerly National Arborist Association). This standard allows the use of natural trimming where branches are pruned back to the natural point of growth in the crown, making the least damaging cut, reducing the chance of insect and disease damage and promoting a healthier regrowth of branches away from power lines.

Professional contractors for tree pruning and removal work may be hired by NPPD. All contractors are licensed arborists; required to follow NPPD guidelines; Power Line Certified.

The illustrations below show how your tree might look after it has been properly pruned. We realize pruning trees for line clearance does not always improve their appearance, but current pruning methods are healthier than older obsolete “topping” or “shaping” trimming methods and provide necessary line clearance for reliability and safety.

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Click to download a Tree Planting, Pruning, and Replacement brochure