• Line Guard installed on a power line to deter squirrels

    Line Guard - Designed to Protect Power Lines from Squirrels and Other Critters

Line Guard: Designed to Protect Your Overhead Lines

At Critter Guard, we understand the importance of keeping your electric powerlines and transformers protected. Due to the high frequency of power outages caused by squirrels, rats, and other animals across the world, it is essential to have a high quality and versatile product that deters squirrels and other animals from gaining access to the powerlines and transformers in the first place.

Line Guard prevents squirrels from running across overhead lines to access substations, transformers, pole mounted switches, and other critical equipment. Two free-spinning wheels act as a jump barrier on both ends of the assembly and five rollers spin independently about the line should the initial barrier be cleared from either side. Line Guard keeps squirrels out at key points of entry vs. the costly alternative of covering all the equipment up, which then creates additional work for maintenance crews. The patented Line Guard components are injection molded of heavy-duty polypropylene that is impervious to sharp critter claws, with UV protection and stabilizers to maintain color quality and making it highly resistant to environmental stress cracking.

Line Guard Features

Close up of Critter Guard's jump barrier installed with all Line Guards for animal mitigation

Jump Barrier

The outside diameter of the jump barrier wheel is 12 inches and fits cable bundles up to 3” in diameter. A stainless-steel conductor clamp and stainless-steel cable ties firmly secures the L-brackets mounted on each end of the assembly to the conductor, keeping the entire system from sliding on the overhead line. The wheel design encourages critters to crawl over it, and as soon as they do, the wheel rotates and they lose their balance. Further attempts by determined critters cause them to try to jump the wheel, where they then land on one of the line rollers and spin off.

Line Guard rollers designed for preventing squirrels, rats, raptors, and other animals from gripping power lines

Line Rollers

Five rollers rotate independently about the line when a critter comes in contact. Each roller is 12” in length, and they come as two halves for an easy snap together fit. The Line Guard assembly is five feet in length when fully assembled. The Line Rollers act as an additional deterrent to ensure that squirrels and other rodents cannot jump or crawl across the line to gain access to critical electronic equipment, keeping your electric, telecom, and/or cable infrastructure protected.

Serving International Markets with Animal Mitigation

Animal-related power outages are not limited to just squirrels, rats, and other rodents that are common in the United States. Critter Guard realizes that many different animals such as snakes, sloths, and even monkeys across the world who similarly cause damage to the power lines and transformers, which need the same high-quality protection. We designed the Line Guard to protect power lines and transformers against many animal types, and, if you are curious about learning more about how the Line Guard would work in your country, then feel free to contact us today!

Lasting Powerline and Transformer Protection

Protecting electric, telecom, and cable infrastructure from animal-related outages is our number one priority. The Line Guard and Pole Guard are designed to humanely deter squirrels, rodents, and other animals from causing significant outages in your home, business, or area. If you work with electric power, cable television, or data communications industry and have technical or commercial questions, feel free to contact us today to learn how we can help you prevent major outages in your area.

  • The City purchased Line Guard specifically because we were having repeated problems with squirrels accessing the substation from the overhead lines. We've had no further occurrences since we installed Line Guard. I'd recommend Line Guard without hesitation.

    Mr. Chris Lindholm
    Public Works Director
    City of Lindsborg, Kansas

  • We were having repeated squirrel issues at this location until we installed the Critter Guard materials. It has now been a year without that first problem. The guards do not clutter up the switch location and do not detract from the appearance of the line.
    Lakeland Electric

  • The positive results at Cordrey lead Entergy Texas personnel to believe the investment and work to put spinners in place at substations throughout the service territory will pay off in fewer outages for customers.
    Entergy TX

  • We have used Critter Guard's Line Guard product for better than six years on Illinois and Missouri overhead power lines near substations. The Line Guard helps us prevent squirrels from gaining access to our substations on overhead lines. We have also used the Pole Guard on wooden poles near substations to establish a barrier to squirrels that approach overhead conductors from the ground. Our objective is to maintain high service reliability by eliminating outages and contain costs by reducing equipment damage caused by squirrels.

    Mission Impassible

    Line Guard Specifications

    Animal mitigation products designed for years of use in all weather conditions.

      Wheel Roller Clamp
    Material Polypropylene Polypropylene Polypropylene
    U.V. Resistance Additive check check check
    Manufacturing Process Mold Injection Mold Injection Mold Injection
    Color Utility Gray Utility Gray Utility Gray
    Specific Gravity 0.905 0.905 0.905
    Tensile Strength 3000 psi 3000 psi 3000 psi
    Dielectric Strength 660V/mil (52.3 KV) 660V/mil (52.3 KV) 660V/mil (52.3 KV)
    Arc Resistance 160 160 160
    Decomposition Temp 650°F 650°F 650°F
    Dimensions 4" x 12" x .08" 12" x 3" ID x 0.125" 2" x 2" x 1/4"
    Volume 91.8 cc 79.5 cc 4.6 cc
    Weight 83.5g 71.9g 2.0g
    Weight w/ 1/2" ice 140.4g 180g 6.4g
    Wind Loads 207 N 20 N 1 N
    Wind Loads w/ 1/2" ice 348 N 203 N 12 N

    How to Buy

    power line transmission tower
    Power Companies
    Register for an account and contact us for commercial or distributor rates.
    two-story brick home

    Use Cases

    power lightning bolt icon


    Squirrels and other rodents often use power lines and poles to access distribution equipment. Utility companies report between 7 to 20 percent of all power outages are caused by squirrels.

    telecom icon


    Squirrels, roof rats, and other rodents frequently chew into and damage fiberoptic lines. Level 3 Communications said squirrels were responsible for 17% of all fiber-optic cuts.

    raptor bird icon


    Raptor electrocution continues to be one of the major wildlife concerns. The damage happens when the raptor contacts energized phase-to-phase or phase-to-ground conductors at once.

    three Line Guards installed on three power lines
    animal mitigation for telephone poles with Line Guards and Pole Guards
    electrical utility worker finishing installation of Line Guards
    utility pole with seven Line Guards installed
    alternate view of utility pole with seven Line Guard systems installed
    two Pole Guards and ten Line Guards installed deter squirrel damage
    close view of Line Guards protecting power lines
    Line Guards installed on multiple power lines