Abstract: Device for the support and power supply of very low voltage lighting, for example 12 V, by means of non-sheathed conducting rails, resulting in very stable and aesthetic lamps. Each rail (1) is composed of two identical conducting rods (15) connected by an intermediate insulating strip (16), the edges (17) of which are projecting. The general profile of the rail is polygonal and includes opposite grooves (27) on each conducting rod, for firmly securing plates serving to connect the rails to one another or to lamps. The rail comprises flat upper and lower surfaces (20, 21) against which suspension clamps or magnetically fixed electrical connectors can be applied. Application in home lighting appliances or display areas.