| 摘要 |
This invention relates to a disabling system for disabling an electrical device when the device is removed from a selected zone. The system includes a master unit (18) which contains transmitter means for transmitting an enabling signal in the zone and at least one slave unit (14) which is operably connected to an electrical device (12.1 to 12.3). The enabling signal (20) is typically transmitted via an electrical installation (16) in the zone. The slave unit (14) includes a receiver means for receiving the enabling signal when the electrical device is in the selected zone, and a disabling means for disabling the device when the enabling signal is not received thereby to disable the device when it is removed from the zone. The invention also extends to a method of disabling an electrical device when the device is removed from the selected zone, and to a master unit and a corresponding slave unit for the disabling system. |
