Abstract: A safety power track system for carrying light fixtures including a light source includes a generally U-shaped supporting rail, the limbs of which have inwardly bent ends. An internal insulating lining fits into the rail, and has at least a first current conductor embedded therein; a grounding member is connected to the ends of the limbs of the rail, and at least a second current conductor is mounted in, or on an externally inaccessible portion of the lining that faces inwardly of the rail. A transversely mounted, reciprocally movable push-button switch has "on" and "off" positions and is formed with an oblique groove; a presser cam is guided for movement in the groove, and at least two conductors engage the cam in the "on" position. Conductor springs are provided for making contact with the cam, and a conductor fixing screw establishes contact of the spring and the cam.