How to make an indication of the presence of mains voltage

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Well, it turns out that if you turn off the input, then you will not get the voltage from the network to the circuit in any way. But if you connect to the upper terminals of the machine D, then the problem is that you do not need to disconnect the input, since the light will not light up - it is also powered from the input.

It turns out that you need to turn off the machine D, and leave the input on. Since X and H are powered from D and the neutral bus is connected to it, this will de-energize the entire house.

And if you kill the machine with constant switching on and off, then replacing D is easier than the introductory one.

For short circuit and overload AND LEAK - the difavtomats are responsible, the RCD is only for LEAKAGE. That's the whole difference. Those. either RCD + automatic machine, or difavtomat. As for safety - they don't put more than 16A on sockets, you have 32A for the whole house, i.e. the socket will already melt, but the machine will not work yet. Well, as if it requires reworking the wiring and breaking it down into at least two groups (or more) - sockets and lighting separately.

p.s. I do not understand D - is it an automatic machine or an RCD? (the marking is poorly visible, but it seems that it is an RCD (if I see the marking correctly "VD1-63"). If so, then I would replace it with a difavtomat, although in your case this is not necessary, since there is a regular automaton (introductory) above it.

to be honest in the photo, I did not see where the SIP comes out of the D. And the fact that different metals are very bad. It is necessary to at least tin the copper ends on X and H with a soldering iron (cover with tin), or use tips.

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