All About Fence Insulators

Electric fence insulators are moulded from polyethylene (plastic) or made from porcelain. They are designed to fasten electrified wire to different types of posts without losing energy through the post.

There are several styles to choose from because the insulator must match both the type of wire and the type of fence post being used.

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All About

Expert Tips

Expert Tips
The most common frustration with electric fence insulators occurs when the wrong insulator is used for the wrong project.

Corner insulators take most of the tension of the fence, and as a result, the corner insulator may need to be different than the insulators used on the line. There are insulators that are specifically designed for corners and the end of the wire to handle the increased tension.

Offset insulators are useful where there is an existing permanent fence already in place that you wish to protect. This will stop animals rubbing and chewing on wooden posts and can also stop them reaching over the fence to animals or hedges on the other side of the fence.


FAQs about Insulators

Q: Which insulator should I use?
A: It depends on a few key things:

  • 1. What type of post would be the first question: wood post vs. metal round rod posts?
  • 2. Next is what kind of wire is being used: steel, polytape or polyrope?
  • 3. Another thing to consider is the number of corners and end posts you will be using since they take more tension and need to be stronger.

Insulator Requirements


Q: Why do I need to use an insulator for my electric fence?
A: The electric fence insulator keeps the live wire from earthing out on the wooden post or other nearby wire. If a live wire touches a post or earth wire, there will be a short in the line and the fence may not be charged, meaning the animal will not feel the shock. It is important to note that even wooden posts can short your fence out especially when wet, which is why an insulator must always be used.