The blackout was caused when high-voltage power lines came in contact with overgrown trees.
Minimum clearance on primary power lines will be from ground line to 30 feet above the wires. The preferred minimum clearance on all service drops and triplex cables is five feet around the wire. Effort will be made to eliminate all trees, tree parts, and growth points beneath the wires and all weak, diseased, and dead limbs above the wires which may fall or blow into the wires.
Feb 23, The most appropriate way to prune trees for electric utility line clearance is by directional pruning. This pruning method removes branches growing toward conductors in favor of those growing away. Reduction cuts are used for all branches that are stumpcutter.barted Reading Time: 7 mins. Only our certified line clearance arborists can work near power lines.
Neither you nor anyone you contract should attempt this work. Our primary concern is safety. Contact us to determine if it is safe for you or your contractor to remove a tree or part of a tree close to power lines. Observe foot rule. Apr 17, Specifications for Power Line Right of Way Clearance and Tree Trimming Section Scope These specifications require the furnishing of all supervision, materials, labor, supplies, tools, equipment and transportation necessary to trim or remove trees.
Tree clearance distances are based on the voltage and construction of a transmission line as well as the growth rate of trees and management cycle length.
Directionally pruned trees stay healthier than topped trees, have a much better form, and require less pruning in the future because of the use of reduction cuts.
The exact clearance needed is determined by each utility in accordance with federal regulations. The do leeches drop from trees time for clearance concern is summer when lines are conducting electric.