Safety device particularly for use with an electric boiler, cylinder, thermal store or a lift

摘要

The safety device comprises a detection means arranged to detect at least one hazard signal associated with at least one electrical device, such as a boiler, cylinder, thermal store or a lift. Upon receipt of one or more hazard signals associated with the at least one electrical device, the safety device is arranged to perform at least one of the following: electrically isolate the at least one electrical device; or activate a safety routine. The detection means preferably comprises two hazard sensing devices that cause respective switches 5,6 in a hazard sensing circuit 13 to trip open when a hazard is detected, thereby breaking the hazard sensing circuit. A residual current device (RCD) 2, under volt monitoring relay (11, figure 2, AKA supervising relay) or relay (14, figure 3) may be used to detect a change in voltage across the hazard sensing circuit and actuate an isolating device 1 via actuation wire 9 to cut electrical power to a system load 8 of the electrical device. A redundant protection system may additionally be included by provision of a trip actuation path 12 that is actuated by opening of one or more of the switches to actuate the isolating device.