| 摘要 |
PROBLEM TO BE SOLVED: To detect an earth fault of a plurality of power supply parts only by one earth fault detecting circuit. SOLUTION: In a fire receiver including an earth fault detecting circuit for detecting an earth fault of the power supply parts, the earth fault detecting circuit is connected to the plurality of power supply parts, and the earth fault detecting circuit detects earth fault of the plurality of power supply parts. Further, a switching means is provided between the earth fault detecting circuit and the plurality of power supply parts and controlled to selectively switch and connect one of the plurality of power supply parts to the earth fault detecting circuit. The switching means is controlled to connect the plurality of power supply parts to the earth fault detecting circuit so that the higher the significance of the power supply part is, the longer the connection time thereof is. Further the fire receiver includes an indicating means controlled to distinguish and indicate the occurrence of earth fault in the plurality of power supply parts. COPYRIGHT: (C)2008,JPO&INPIT
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