Quick Answer
Setting up a high-tensile electric fence requires substantial corner bracing (H-brace or diagonal brace at every corner), proper wire tensioning to 200–250 lbs (use an in-line tensioner or crimped ratchet), and a quality energizer sized for the total wire miles. High-tensile wire at 12.5 gauge handles 90% of livestock applications and lasts 30–50 years when properly installed.
Materials List
- 12.5-gauge high-tensile galvanized steel wire
- Treated corner posts: 6" diameter, 8 feet long (minimum)
- Brace posts: 4–5" diameter, 7 feet long
- Line posts (fiberglass or T-posts): 5–7 feet
- In-line wire strainers or ratchet tensioners
- Insulators (appropriate for post type)
- Fence staples or clips
- Electric fence energizer (sized for wire miles)
- Ground rods (3 minimum, 6 feet each)
Corner and Brace Post Installation
Corner posts bear the full tension of all wire strands — they must be set in concrete or heavily tamped gravel at 3.5–4 feet deep. An H-brace assembly consists of two vertical posts set 8 feet apart with a horizontal brace pin connecting them at the top, and a diagonal wire brace (twisted tight with a rod) from the top of the inside post to the base of the outside post. This configuration prevents the corner post from being pulled inward by wire tension. Install one H-brace for every end and corner point.
Line Post Spacing and Installation
High-tensile wire can span 60–80 feet between line posts on flat terrain. Use fiberglass posts as "sighter posts" between driven T-posts or wood posts. Drive T-posts 18–24 inches deep. Fiberglass posts can be pushed in by hand on soft to medium soil. Space all line posts at consistent intervals to ensure wire lies at a uniform height.
Wire Tensioning
High-tensile wire must be tensioned to 200–250 lbs of pull force. Under-tensioned wire sags and livestock can push under or through it. Over-tensioned wire risks post or brace failure and can snap in cold weather when the wire contracts. Use a mechanical wire tensioner or in-line ratchet strainer to achieve and maintain proper tension. Install an in-line tensioner every 800–1,200 feet and at every corner to allow independent re-tensioning of sections.
Wire Connection Best Practices
Never twist high-tensile wire to join it — the twisted section has only 20–30% of the wire's rated strength. Use proper sleeves (crimped with a fencing tool) or commercially rated split bolt connectors. At corners, use corner insulators that allow the wire to change direction without a sharp bend (bends weaken the wire over time).
Our Recommendation
High-tensile electric fence is the best long-term value in livestock fencing. The 30–50-year lifespan and minimal maintenance requirements make the higher upfront installation cost worthwhile. The critical investment: proper corner bracing and quality energizer. Cut corners on line post spacing if budget demands, but never on the bracing or energizer — these two components determine whether the fence works and whether it stays standing.