Wire Tensioners and Strainers for Secure, Reliable Electric Fencing

Choosing the Right Wire Tensioners and Strainers

The right tensioning equipment depends on the conductor, fence length and whether your system is permanent or regularly altered. A good strainer should allow controlled tension to be applied without unnecessarily cutting or weakening the conductor.

• For permanent wire fencing, choose a robust in-line or ratchet-style tensioner that allows the conductor to be tightened again as the fence settles or responds to temperature changes.
• For high-tensile wire, use a tensioner specifically rated for the wire type and expected load. Avoid simply pulling the wire as tight as possible: excessive tension places unnecessary load on end assemblies, corner posts, insulators and the conductor itself.
• For rope, cord or tape systems, check that the tensioner is compatible with the conductor. Products designed for steel wire are not automatically suitable for electric fence tape.
• For temporary or rotational grazing systems, consider whether adjustable tensioning is more useful than permanent straining. Electric fence reels can make regularly moved fence lines quicker to set up and dismantle.
• Check end and corner posts before increasing tension. A tensioner cannot compensate for an inadequately braced or unstable anchor point.

For a complete installation, you may also need suitable electric fence posts and electric fence insulators to support and isolate the live conductor correctly.

Technical Specifications and Electric Fence Care

Fence wire naturally responds to changing conditions. Temperature variation can cause metal conductors to expand and contract, while post movement, livestock contact and general weather exposure can gradually alter the tension along a fence line. Being able to re-tension the conductor therefore makes routine maintenance considerably easier.

Compatibility matters just as much as strength. Before fitting a tensioner or strainer, check the recommended conductor material and diameter, the tensioner's maximum working load where specified, and whether it can remain permanently installed in an electrified fence. Insulated components must also maintain adequate electrical isolation from non-live posts and fittings.

Pro tip: inspect tension at the same time as testing your fence voltage. Walk the fence line looking for sagging sections, damaged insulators, vegetation contact and loose connections, then use an electric fence tester to confirm performance. Re-tension gradually rather than adding excessive strain in a single adjustment.

If you are building a complete system, pair your conductor and tensioning equipment with a correctly specified fence energiser. Depending on your location and power supply, options include battery fence energisers, mains fence energisers and solar fence energisers.

Frequently Asked Questions

What does a wire tensioner do on an electric fence?

A wire tensioner removes excess slack from the fence conductor and helps maintain a consistent fence line. Adjustable models also allow wire to be re-tensioned as temperature, weather and normal use affect the fence.

How tight should electric fence wire be?

Electric fence wire should be taut without being excessively strained. Over-tensioning can put unnecessary pressure on wire, insulators, end posts and corner assemblies. Always follow the tensioner and conductor manufacturer's specifications.

Why does my electric fence wire keep going slack?

Temperature changes, movement in posts, livestock contact and normal settling can all reduce wire tension. Inspect the complete fence line before re-tensioning, particularly end posts, corner posts, insulators and connections.