The two most common errors we see are using too many line posts, and over tensioning the wire. Remember, this isn't barbed wire. Power fence is a mental barrier for your animals, not a physical one. When using high-tensile wire, it allows for greater line post spacing than conventional wire; usually 50 feet as a minimum. Also, don't over-tighten the wires. You want a flexible system that allows for wildlife impacts, snow loading, etc. Over-building a power fence makes it too rigid, and you lose this benefit. Plus, it costs you more for materials.