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Electric Fence Controller Safety

The controller is the heart of an electric fence. Choosing the right one and setting it up as the maker intends is the most important step in keeping people and animals safe.

What does the controller do?

It takes power from the mains, a battery or a solar panel and releases short pulses to the fence. A well-designed controller limits the energy of each pulse and the time between pulses so the fence deters animals without being a continuous source of current.

A device that is not designed for fencing, or that has been modified, may not have those limits. This is why instructions say to use only approved fence controllers.

Read the manual before installation and keep it with the unit, since it lists the limits and the setup steps that matter for that model.

• It converts supply power into short pulses for the fence
• Its output limits are part of the safety design
• Modified or non-fence devices may lack those limits

How do you choose one?

Pick a controller that suits the length of fence, the type of animals and the vegetation, using information from the maker, a supplier or your extension office. Look for markings from a recognized testing laboratory on the label. Do not guess about sizes or output.

Avoid homemade controllers, repurposed devices and used units of unknown condition. Ask the maker if a model is suited for your use, and check the date and instructions.

Keep the receipt and model number in your farm records so a repair person or the maker can identify the unit later.

• Check the label for a testing mark
• Ask the maker about suitability
• Avoid homemade or modified units
• Keep the manual and model number

Where should you mount it?

Follow the manual. Controllers are generally kept dry, protected from weather and animals, and mounted where they do not touch flammable material. Mains-powered units need proper outlets with protection suited to the location, so ask an electrician.

Keep the controller out of reach of children, and keep it where you can reach the shutoff quickly.

• Dry, sheltered location
• Away from flammable material
• Out of children's reach
• Quick access to the shutoff

Why does grounding matter?

The ground system completes the circuit that makes a shock effective, and a poor ground weakens the fence. Grounding for fencing is separate from your building's electrical grounding. Do not connect the two unless the manufacturer and an electrician say so.

Follow instructions for ground rods and connections, and check them regularly, since dry or frozen soil changes performance.

• Keep fence grounds separate from building grounds
• Follow ground rod instructions
• Check connections each season
• Expect changes in dry or frozen soil

What about lightning and surges?

Lightning can damage controllers and send surges along wires into buildings. Ask your supplier and electrician about surge protection and disconnect advice. The guide on electric fence and lightning offers general ideas.

Do not stand near fences or touch controllers during a storm.

Keep an eye on the weather forecast from the National Weather Service in storm season and plan inspections around it.

• Do not stand near the fence or controller during a storm
• Ask about surge protection before storm season
• Know whether the maker advises disconnecting

How do you maintain the system?

Test the fence as the maker instructs, using proper test equipment, not your hand. Replace batteries on schedule, keep solar panels clean and check cords and connections. Keep vegetation off the wires.

Turn off the controller before working on the fence and before clearing brush or repairing wire.

Write down the date of each test and any reading you took, so changes over time are easy to see.

• Test with proper equipment
• Replace batteries on schedule
• Clean solar panels
• Keep vegetation off wires

When should you call a professional?

Call a licensed electrician if the controller is powered from a building circuit and you are unsure how to wire it. Call the manufacturer for questions on performance and repairs. If a unit gets hot, smokes or smells burnt, unplug it and stop using it.

Replace damaged cords and enclosures. Do not repair controllers yourself unless the manufacturer says it is safe to do so.

• Call an electrician for any building circuit connection
• Call the maker about performance questions
• Unplug a unit that smokes or smells burnt
• Replace damaged cords and cases

Last reviewed: November 12, 2026. Written by the Farm Safety Editorial Team. See our editorial policy.