Burglar deterrent lights - switched on and off intermittently using refrigerator thermostat

摘要

Burglars are deterred by turning lights ON and OFF sporadically, controlled by the thermostat of a refrigerator or freezer. The lighting circuit (K) is switched by a relay (R) connected directly across the refrigerator (G), i.e. with the thermostat (T) between it and the mains. A change-over contact on the relay gives the choice of lights ON either while the refrigerator is ON (a,c) or OFF (a,b).