Whilst Electric Pillars were used to defend Fortified Tower Outposts, for larger bases the Federation used proper connecting electric fences. The electric fences were used to defend the Federal Military's bases such as the military assistance base on Roku San. They are placed completely around the perimeters of bases and each segment is physically connected, unlike the pillars. The current created through them was constant and very powerful, capable of killing any Arachnid that came into contact with it.