| 摘要 |
Energy consumption of a building is reduced by switching electrical apparatus (10) thereof off when not required. An intruder alarm (14) serves to register whether the building is open or closed by being alternatively disarmed and armed. A controller (22) transmits a control signal over the mains supply (20) whenever the alarm (14) is disarmed or armed. This signal is picked up by a remote receiver (24) which causes a relay (26) to close or open, alternatively connecting and disconnecting the apparatus (10) to the mains (20) according to whether the building is open or closed. Manual control is provided by a telephony or other connection TT to the controller (22). The alarm (14) may be replaced or supplemented by a lock or other means to register the state of the building, and radio signalling may be employed instead of mains signalling. The system may be used domestically.
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