Vegetation Management Guidelines
Coast Electric adheres to Rural Utilities Services (RUS) and the National Electrical Safety Code (NESC) when managing rights-of-way.
The right-of-way shall be prepared by removing trees, clearing underbrush, and trimming trees so that the right of way is cleared close to the ground and to the width specified. However, low growing shrubs, which will not interfere with the operation or maintenance of the line, shall be left undisturbed if so directed by the owner. Slash may be chipped and blown on the right of way if so specified.
The landowner’s written permission shall be received prior to cutting trees outside of the right of way. Trees fronting each side of the right of way shall be trimmed symmetrically unless otherwise specified. Dead trees beyond the right of way which would strike the line in falling shall be removed. Leaning trees beyond the right of way which would strike the line in falling and which would require topping if not re-moved, except that shade, fruit or ornamental trees shall be trimmed and not removed, unless otherwise authorized.
RUS Part 1730.22 (c), Facilities must comply, be maintained, and be inspected according to the National Electrical Safety Code.
Section 218 - Vegetation Management
- Vegetation that may damage un-grounded supply conductors should be pruned or removed. Vegetation Management should be performed as experience has shown necessary.
Note 1: Factors to consider in determining the extent of vegetation management required include, but are not limited to: line voltage class, species’ growth rates and failure characteristic, right-of-way limitations, the vegetation’s location in relation to the conductors, the potential combined movement of vegetation and conductors during routine winds, and sagging of conductors due to elevated temperatures or icing.
Note 2: It is not practical to prevent all tree-conductor contacts on overhead lines.
- Where pruning or removal is not practical, the conductor should be separated from the tree with suitable materials or devices to avoid conductor damage by abrasion and grounding of the circuit through the tree.
- At line crossings, railroad crossings, limited-access highway crossings, or navigable waterways requiring permits:
The crossing span and the adjoining span on each side of the crossing should be kept free from overhanging or decayed trees or limbs that otherwise might fall into the line.
RUS & NESC Guideline Exceptions
It may be necessary to remove trees if excessive trimming is required for Coast Electric to comply with RUS and NESC specifications. When trees are located beneath overhead conductors, removal is often necessary to provide safe clearances. Most tree species in the southern United States have mature heights between 60 and 100 feet. Consequently, it is Coast Electric's practice to remove such trees to maintain the vertical and horizontal clearances mandated by the NESC.
During power restoration, the applicability of RUS and NESC standards may vary. For example, trees that are considered a potential hazard to the public and/or Coast Electric facilities are removed as quickly as possible without notifying the landowner.
Vegetation Management Specifications
Coast Electric's overhead maintenance practices include, but are not limited to:
- Accomplishing specified minimum clearances around all primary and secondary conductors, including de-energized lines.
- Multi-phase lines - 30 feet.
- Single-phase lines - 20 feet
- Open-wire secondary lines - 10 feet
- Triplex or duplex secondary lines - 6 feet
- Pruning over-hang clearance 30 feet or greater (measured from the highest phase conductor or shield wire).
- Pruning trees to the most applicable standard between RUS Guidelines, NESC and/or ANSI A300.
- When applicable, mechanically trimming trees as close to the tree-base as possible.
- Clearing every pole structure and guy wire from trees, underbrush and/or vines (a minimum of 10 feet in width).
- Cutting vegetation growing in and around fence-lines just above the top of the fence with the sides neatly trimmed.
- Cutting stumps less than 6” in diameter 2” above ground level or less. Larger stumps will be allowed to exceed 2” in height at the discretion of Coast Electric's ROW Coordinator. No stumps shall be left in a condition that may result in injury or harm. Coast Electric is not responsible for grinding or removing stumps.
- Cutting or topping hazard trees that may threaten the reliability of overhead facilities. Hazard trees may be dead, dying, diseased, damaged, leaning or otherwise structurally unsound.
Coast Electric's underground maintenance practices include, but are not limited to:
- Cutting and/or mowing trees and/or vegetation from over buried conductors (10 feet minimum, 5 feet from each side of the conductor).
- Clearing trees and/or vegetation from around electric facilities (10 feet in front and 5 feet from the back and sides).
- Removing trees and vegetation that prevents access to and/or maintenance of underground facilities.
- Coast Electric is not responsible for grinding or removing stumps cut away from electric facilities.
- Decals listing planting zones shall be placed on electric facilities.
Herbicide Management Specifications
Coast Electric utilizes low-volume herbicide applications to control the vegetation growing within the association’s ROW. The key objective of Coast Electric's herbicide program is to eliminate tall-growing tree species from within the cooperative's ROW while encouraging the growth of low-growing grasses, flowers and plants. Coast Electric only utilizes herbicides that have been approved by the Environmental Protection Agency and the Mississippi Department of Agriculture. The herbicides used are environmentally friendly and pose no danger to people, pets, wildlife or livestock.
Coast Electric's herbicide applications generally occur six to 12 months following ROW maintenance and are considered sufficient when 98 percent of the targeted vegetation is controlled. Herbicide crews do not harm and/or treat any fruit, shade or ornamental trees, shrubs or bushes growing within maintained yards. Coast Electric's maintenance personnel have a working knowledge of the herbicides being used and have all federal, state and local licenses, certificates and/or permits required by law. We also require the presence of a licensed commercial pesticide applicator on every herbicide maintenance project.
Coast Electric's herbicide maintenance practices include, but are not limited to:
- Mixing and applying herbicide formulations according to label directions and/or to manufacturers’ recommendations.
- Using herbicides that are labeled specifically for use on utility rights-of-way.
- The proper disposal of all chemicals and/or containers.
- Locating sensitive and/or restricted non-vegetative rights-of-way locations where herbicides, as specified on the manufacturer’s label, should not be applied.
- Transporting all necessary herbicides and herbicide agents safely from one job location to another.
- Keeping all equipment in a condition that prevents leaks and/or spills.
- Providing detailed records that include the:
- location and date of herbicide applications.
- name and amount of herbicides being applied.
- applicators name and license number.