DISASTER-PREVENTING ILLUMINATION LIGHTING DEVICE, DISASTER-PREVENTING ILLUMINATION DEVICE, AND DISASTER-PREVENTING LIGHTING SYSTEM

摘要

PROBLEM TO BE SOLVED: To ensure that an illumination load is turned off when a branch connection of another equipment from the same ac power supply is made by providing inside an off circuit a rectifier element which is connected in parallel with an off switch and connected in series with and inversely to a signal generation means. SOLUTION: When a parallel, branch connection of a disaster-preventing illumination lighting device 24 is made and an off switch 15 is turned off, a current flows through a course from a white terminal 3W to the inside of a lighting device 24 involving a full-wave rectifier circuit 23 to a breakover element 21 to a resistance R2 to a first rectifier circuit 19 to a black terminal 3B. No current flows through a light emission element 17a and the light emission element 17a emits no light, so a phototransistor 17b is interrupted to operate a lighting stopping circuit 16. Then the oscillating action of an inverter circuit 8 is forcibly stopped to turn off a disaster-preventing illumination load 1. Therefore, the disaster-preventing illumination load 1 can be surely turned off by turning off the off switch 15.