Source google image: http://upload.wikimedia.org/wikipedia/commons/9/9a/Sch%C3%A9ma_du_Pyl%C3%B4ne_%C3%A9lectrique_quatre_triangles.png
Poteau électrique schéma
Source google image: http://upload.wikimedia.org/wikipedia/commons/9/9a/Sch%C3%A9ma_du_Pyl%C3%B4ne_%C3%A9lectrique_quatre_triangles.png