A detector

摘要

A detector 16 is provided in a housing 1. An associated male connector 2 is provided in the housing for mounting the housing to an independent cooperating female connector, for example a ceiling rose 4. In use the male connector receives electrical power from and the housing is demountably supported by the female connector. A detector and alarm circuit 16 is connected to receive electrical power from the male connector. An associated female connector 10 is also provided in the housing and is connected to receive electrical power from the male connector 2. The female connector is adapted for supporting and supplying electrical power to a cooperating device such as a ceiling light fitting 12 mountable to the associated female connector. The detector and alarm circuit includes a detector (24, Fig. 2) for detecting for example a hazardous gas condition such as smoke and a loudspeaker (25) and lamp (26) which are activated when such a condition is detected. The circuit is arranged to transmit/receive signals via the power supply.