ANORDNING FOR DETEKTERING AV EJ ONSKVERDA SIGNALKOMBINATIONER AV TVA SIGNALLAMPOR I TRAFIKLJUS

摘要

Apparatus for preventing the simultaneous energization of a pair of traffic lights includes a detection device for monitoring any leakage current in the cables between the traffic lights and a control box. A threshold voltage related to a predetermined level of leakage current to be monitored is coupled to the detection device which actuates an alarm if the leakage current across at least one traffic light exceeds said predetermined level of leakage current.