• Line Guard installed on a power line to deter squirrels

    Line Guards Designed to Protect Your Electric Power Lines

The Critter Line Guard keeps squirrels from running across overhead lines to access substations, transformers, and pole mounted switches. Two free-spinning wheels act as a jump barrier, and five rollers spin about the line. Meaning, we keep squirrels out at points of entry vs the very expensive alternative of covering all the equipment up.

The patented Line Guard is injection molded of heavy-duty polypropylene, highly resistant to environmental stress cracking, and of course UV protection to maintain color quality. Thousands of these wildlife guards have been on power lines service-free for over a decade.


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

Jump Barrier

The outside diameter of the wheel is 12 inches, and fits cable up to 3” in diameter. A 5/16" worm-drive, conductor clamp also firmly secures the L-brackets to the conductor.
Line Guard rollers designed for preventing squirrels, rats, raptors, and other animals from gripping power lines

Line Spinners

There are five rollers that rotate about the line when an animal comes in contact. Each roller is 12”, and they come as two halves for an easy snap together fit. The Line Guard is five feet in length when fully assembled.

  • 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 Companies
    Power Companies
    Register for an account and contact us for commercial or distributor rates.

    Use Cases



    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.



    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 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 is best with both 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 guards installed
    Two pole guards and ten line guards is a great way to deter squirrels
    Closer view of line guards protecting power lines
    Line Guards installed on multiple power lines