| 摘要 |
<p>The object of this invention are some electronic circuits represented on schemes (101, 102, 103, 104, 105, 106, 107) reported on the description; they are useful for the detection of the earthing system and the test of the residual current circuit-breakers efficiency, and they are connected to the phase, the neutral and the earth of the electrical users (such as an electrical installation, a socket, a tool or an appliance). The electronic circuits are installed on tools (167, 171, 172, 173, 174, 175, 176), some of which (177, 181) can make intervene the residual current circuit-breakers assembled for protection on the appliances, plugs served to appliances (182), cables and extensions provided with plug and socket, plugs (193) provided with cables type 2P + E +earthing/test conductor/signaller (194), or they are installed in an accessory (202) assembled on the electrical user, and work by turning on a green or other coloured light led.</p> |
