Electric fence kept insulated from the earth and from any materials that will conduct electricity and ignite or short out the fence. Fencing must therefore avoid vegetation, and cannot be attached directly to wood or metal posts. Typically, wooden or metal posts are driven into the ground and plastic or porcelain insulators are attached to them, or plastic posts are used. The conducting material is then attached to the posts. Electrified palisade fences are usually made from painted mild steel, galvanized steel, stainless steel or aluminium. Typically the fences are . The palisade fence is mechanically stronger than a typical steel cable
Rova of Antananarivo the southern part. It was not until the dawn of the 19th century that a perimeter wall of sharpened wooden stakes would constitute another defining feature of rova construction. The Rova of Antananarivo is located above sea level on Analamanga, originally the highest of the numerous hills in Antananarivo. Around 1610 or 1625, Andrianjaka, King of Imerina and grandson of King Andriamanelo, ordered a garrison of 1,000 soldiers to seize the strategic site from its original Vazimba inhabitants. He reportedly succeeded with minimal bloodshed. According to oral history, the mere encampment of his army at the foot of Analamanga was