Why does the difavtomat not turn off when connecting the phase and earth?
Hello. 3 white wires enter the apartment. I determine the phase of the tester. Which of the remaining land, and what zero I do not know, so I alternately connect both wires to the difavtomat. Next, I connect the difavtomat - the phase and the estimated zero (ground), then with the control (40W light) I connect to the output of the difavomat. The lamp lights up at any connection - the phase and the estimated zero or phase are the alleged ground, and the difavtomat does not turn off. The test button on the difavtomat works. The voltage between phase and zero and ground phase is the same - 225 V, between zero and ground 0 V. In the shield, zero is connected to a separate bus, and the ground is connected to the shield body. Why is the Legrand not disconnected when phase and earth are connected?
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Hello! With the TN-C-S grounding system, ground and neutral conductors are combined into a common PEN conductor. In the building, this conductor is divided into zero and protective, that is, both of these conductors are electrically connected to each other, so there is no voltage between these conductors. Therefore, when zero and phase or earth and phase are connected to the difavtomat, it will work equally and should not be turned off, as there is no current leakage. If a phase and a zero are connected to the diphtomat, and you connect a light bulb between the phase and ground, then the diphtomat will turn off, because there will be a leakage of current to earth - in this case, the current will flow through the phase conductor, but not through the neutral conductor connected to the difavtomat this is the current leak that the difavtomat fixes. But in this way you will not determine where the earth is, and where it is zero, since if you connect the earth to the diphtomat on the contrary and leave the real zero as a “protective” conductor, then the difavtomat will turn off if the lamp is connected between phase and real zero. Therefore, in the absence of marking, it is possible to determine the neutral and protective conductor only by calling them.