| 摘要 |
An anti-fraud device applied in electrical power supplying networks for buildings in general, which includes at least and automatic switch presenting inlet and outlet terminals of an electric supplying line. The switch is connected to a coaxial cable having a central conductor that corresponds to the active pole or phase of the electric current, and at least an anti-fraud security electrode defined by a ground mesh. In a preferred embodiment of the invention, the central conductor and the ground mesh are respectively connected to the outlet terminals of the automatic switch. In single-phase connections, the inlet terminals of the switch are both connected to the phase of the electric supplying line. The ground mesh and the central conductor are short-circuited, through an insulating sheath, by cutting the cable with a sharp tool, thereby provoking the switch to trip. In a second embodiment, the cable includes a sensing mesh short-circuited with the phase for provoking the switch to tr ip upon a fraud attempt. In a three-phase connection, the automatic switch includes a pole for each phase, a coaxial cable connected to each phase, each pole comprising a sensing mesh which will act in the same manner after being short-circuited with the ground mesh. Said sensing meshes are connected to the same outlet terminal of the switch, and each central conductor of the cable to an outlet pole of the switch.
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