You decide to build a corrugated fence. You have a set of posts. You even find a way to get the end of the rail and have the top rail in place. Now it’s time to install the lower voltage wire. No matter how hard you try or how hard you pull a wire, you don’t seem to be able to tighten it. The wire that is commonly used as a lower-voltage wire on a chain fence is a 9 gauge galvanize wire. It usually comes in rolls of 170 ‘or more. The wire is thick, heavy, and difficult to stretch.