How to Detect an Underground Fence Break

Underground fencing is commonly used in residential settings to contain dogs. The fencing is buried a few inches under the soil and conducts a low-voltage current. Dogs wear a special collar that is activated when the dog approaches the fence. A noise is emitted to alert the dog, followed by a shock designed to keep the dog from crossing the fence line. These underground fences can be damaged by digging and by falling limbs. Locating a break is a simple and easy process.

Things You'll Need

  • 100 RF Choke
  • AM radio
  • Screwdriver
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Instructions

    • 1

      Purchase a 100 RF choke from a hobby or electric supply store. You will also need a radio capable of receiving AM band frequencies. Tune the radio to 600 mhz.

    • 2

      Unplug the power cord of the underground fence power supply. Use a screwdriver to loosen and disconnect the wires leading to the fence from the power supply.

    • 3

      Connect the ends of the RF choke to the terminals where the fence leads were attached. There will be a lead on each end of the choke. Connect one lead to one terminal and the opposite lead to the other terminal.

    • 4

      Turn the adjustable transmitter strength to full. The power supply should not indicate a break at this point. Connect the fence leads to the ends of the RF choke. Connect one wire to each end of the RF choke.

    • 5

      Turn the volume of the AM radio up and walk along the fence line. You will be listening for a throbbing sound that will indicate the underground line is intact. When the throbbing stops this will indicate a break in the line.