How to choose an RCD and a difavtomat in the electric network of a country house?
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viewsHello. Please help me understand the current situation (pattern). In my country house, a single-phase voltage of 220 volts is connected. Also, electricians connected the following equipment: input automatic machine, meter, automatic machines for each line with “UZM-51” connected to them.
I want, if possible:
- Between the input machine and the counter, connect (add) the second “UZM-51” (in case of a breakdown already connected), as well as connect the RCD from the fire;
- All machines (except the input one) should be replaced with difavtomats with the connection of the already existing “UZM-51”, or it may be better to leave the machines already connected, that is, everything is as it is, but connect RCDs from electric shock to them.
Which option is preferable (better) I do not know. As far as I understand, difavtomat is an automatic machine + RCD in one device? And please help me pick up the RCD and the difavtomat by type and current (mA). If possible, please show, schematically, how to connect all this. Thanks in advance for your help.
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Good afternoon, Alexander.
From the first paragraph of your question I realized that after each automatic switch of the outgoing line UZM-51 was mounted.
Having studied the PUE, you will find that it is usually not necessary to install RCDs in the outgoing lines going to stationary devices, lamps, lighting networks. Find out why builders did this. They, I note, could follow the project. If there wasn’t one, it means that they charged the price of work.
I attach a typical UZM-51 connection diagram in the photo to this answer, read it. As can be seen from it, the RCD is installed between the meter and the circuit breakers of the outgoing lines. An introductory machine should be in front of the meter. No other RCD is provided for in the Rules.
Your RCD serves to disconnect the network when the voltage drops below 160 V or exceeds 280 V. It also protects equipment from surges due to lightning discharges and other powerful external loads.
I don’t understand the desire to replace the already installed circuit breakers with others - I need a motivation that you have not put forward. If the rated currents of the machines correspond to the permissible currents of the outgoing conductors, then nothing needs to be changed.
To protect against electric shock, it is possible to use UZO IEK VD1-63 2P 25A 30mA. Only you have to choose the right amperes (25A - this is an example) - you do not bring the load of your network.
I don’t see the need to put a fire safety RCD together with “anti-traumatic” - this is my opinion. Let me explain: a 30-milliampere will work and if the insulation of the wires is broken by a current that does not cause a fire, there will not be enough power.
The selection of RCDs installed in series is detailed in detail here in this article.