Pruning Practices, Clearance Standards, and Species-Specific Management
This domain tests the actual pruning prescription and clearance decision: where the cut goes, how much clearance is needed, and how species and line type change the answer.
Core rules and concepts
- Utility pruning uses directional cuts to laterals, side pruning, V-pruning, and removals; avoid topping, stubs, and lion-tailing.
- When reducing to a lateral, choose a branch at least one-third the diameter of the removed limb and capable of assuming dominance.
- Clearance is measured from the conductor at maximum sag and sway to the nearest vegetation, not from the pole or at midspan only.
- Distribution and transmission clearances differ; transmission is governed by FAC-003 MVCD and utility specifications, while distribution follows utility and state requirements.
- Species response matters: strong compartmentalizers tolerate smaller wounds; prolific sprouters may need removal or growth regulators; conifers and palms have different pruning limits.
Worked example
A 12.47 kV phase requires 8 feet of clearance. A 6-inch branch is 5 feet from the conductor. Remove it back to a lateral at least 2 inches in diameter that gives 10 feet of clearance; if no suitable lateral exists, remove the limb to the collar. Do not top the tree.
Traps that cost marks
Using one clearance number for all voltages; leaving stubs that sprout; removing too much crown; and pruning a species without considering its sprouting and decay response.