Connecting TNC Network to Home Switchgear: PEN Conductor Separation & GSU Strip Placement

Question

Hello.
I have a problem because I am helping my colleague install electrical wiring in a single-family house. According to the conditions, the house will be connected to the TNC network. The arrival will be in a separate outbuilding about 30m from the house, there will be a meter. I have a question about how to properly connect the switchgear at home. If the PEN conductor is separated at the meter, is the connection method in Figure 1 correct?

kSmuk · Accepted Answer

PE conductors from sockets or lighting points are led together with the phase conductor and the neutral conductor directly to the switchboard (using, for example, YDYp directly flush-mounted). There you connect the phase conductor to the overcurrent protection, the neutral one to the N bus of the RCD to which this circuit is connected, while the PE protective conductor is connected to the PE bus. To the PE rail in the distribution board, you also connect the overvoltage protection, if fitted, and all PE conductors of the socket circuits, devices supplied directly (air conditioning, induction hob, etc.). From the PE rail of the switchboard to the main equalizing rail GSW you run a cable or a Cu wire (as you prefer) with a thickness of preferably 10 mm?. You connect all conductive foreign elements to the GSW bus (you cover with equipotential bonding). They are, for example, a bathtub, a shower tray, a heating stove, air conditioning, steel pipes (e.g. gas pipes), a boiler, etc. To the GSW bus, from the earthing control window outside the building, you lead a Cu wire of at least 10 mm?, or a hoop. The link or the cordage is connected with the connector in the earthing control window. You then have easy access to the grounding terminal in order to perform a control earth resistance measurement over time.

Łukasz-O · Answer

Before I answer that, let me ask you. Is the colleague qualified to deal with the installations?

Anonymous · Answer

I also have the impression that the information that a friend has read something somewhere is not enough to do the whole thing correctly. Tabula rasa to fill? Chances are good that what you do will be your wailing wall, not now, in a year or two ... Even the intuition to ask at night, when the moderators were probably asleep, also failed.

mof1707 · Answer

I counted on help, not checking my qualifications. Honestly, I have them, but I just never did the entire installation. It was always, for example, half of the building or apartment where the power supply was already connected with the earth electrode. And the fact that I wrote at night, I don't know what that has to do with anything?

kSmuk · Answer

If anything, it's TN-CS. 1. Split the PEN conductor to PE and N as close to the house as possible, that is in the distribution board in the building. 2. Install the GSW / GSU rail in a convenient place, remembering to make equalizing connections with a minimum of 6mm? Cu, and the connection between the PE rail in the switchboard and the GSW / GSU with 10mm?. 3. Connect the bednarke to the GSU / GSW, from there you pull the 10 mm? Cu cable to the switchboard, which you connect to the PE rail. On this bus, you also split the PEN conductor into PE and N. 4. As for the coverage of heating pipes with equalizing connections, all the heating conductive elements should be covered with equalizing connections. If the heating installation is made with PEX pipes, you do not need to make equalization connections of these pipes. 5. As for the distribution board, if you want to use two grounding bars, the PE bus must have a galvanic connection to the second PE bus. In addition, you make the N connection directly to the FR switch, and not to the N bus. You will need N busbars for RCDs, one for each.

elpapiotr · Answer

Hello. Why is that ?

mof1707 · Answer

ad.1 Is the chapter shown in the picture correct? ad.2 Do equipotential bonding have to be made with a strand? cannot there be a wire? ad.4 the installation will be made in alupex, I understand that equalizing connections should have the shortest possible route, what else do we connect them to, apart from e.g. gas installation? What may be the maximum distance from the rail? Should the equalizing conductor diameter be increased depending on the distance? In short, what should you remember when installing an installation in a single-family house? Apart from all those gsw, gsu ... Where can you make the biggest mistakes? Regards.

zbich70 · Answer

And the connection between PE and GSU is what? Mounting rail TH?

mof1707 · Answer

what????

michcio · Answer

The TH rail is the flat bar on which the devices in the switchgear are latched. The PE rail must be connected to the GSU.

mof1707 · Answer

I know what the th rail is. Only I don't understand why zbich70 wrote that the PE connection with GSU is to be made with this rail ...?!

mof1707 · Answer

It will not be connected by a rail I just drew it like this, of course the connection will be directly on the terminal block. I am waiting for an answer, for an earlier post by kSmuk.

Anonymous · Answer

Not a very good solution, additional costs in the form of a 5-wire (PE) wire in the cable. And wouldn't it be better to put the PEN conductor on the PE rail and lead the N from this bus? Do fewer connections the better - you minimize the risk of failure. You won't do TN-S, but TN-CS. And there is no project? It should be as close as possible to the exit of the hoop in the underground floor of the building, e.g. garage, boiler room, so that it is a place with access for the time of measurements, etc. You connect the GSW rail with a cable, e.g. 1x10mm ^ 2 DY, with the PE rail in the switchboard. The cable can be thicker, it won't hurt either. And the hoop outside the building is more for lightning protection. Upload some photos. These are equalizing connections is another topic. You can make them with a copper wire, eg DY minimum with a cross-section of 6mm ^ 2.

elpapiotr · Answer

Hello. Why not 4 or 10 mm?? Where did your friend get these 6?

mof1707 · Answer

I will add photos later, because I don't have one. In short, what we connect to the GSU bus and what to the GSW? It is not one and the same? Can not be combined?
If there is an installation in the building, what about alupex, what to connect to the equalizing rail?

mrst · Answer

Hello. GSU and GSW are practically the same. The PE conductors of the installation and foreign conductive parts are connected to the grounded GSW.

Anonymous · Answer

GSW-Main equalizer rail GSU-Main earthing bar In residential houses, one rail is enough and it will be the GSW rail. Will you also lead the cooperage to the kitchen or to the first floor? PVC is not connected to GSW because it is not a foreign or active conductive part. Link Page 8.

mof1707 · Answer

After all, one cable will go from the PE switchgear towards GSW. So why connect each PE conductor of the circuits in the house to the GSW bus, since they will be connected in the switchgear? In general, what to pay attention to when installing the installation in the house? In short, we stretched the cables to individual receivers, then we will install GSW and connect some conductive elements in the building to it, what then? What else is important in such an installation?

Anonymous · Answer

The PE conductors from the receivers are connected to one common PE bus in the switchgear and the PE bus is connected to the GSW bus to which the equalizing conductors are connected: That everything should be in accordance with the norms and applicable standards.

mrst · Answer

When writing PE conductors, I meant PE busbars of the switchgear to which all PE conductors are connected.

mof1707 · Answer

I know, I was just hoping that you might give me a hint about what still needs to be done with such an installation ...

mof1707 · Answer

All clear. What kind of cables should be used for equipotential bonding? Does it not bother that there will be a distance of 20 m from GSW to e.g. a bathtub? How to attach equalizing pipes, e.g. to a bathtub, etc.?

jacur · Answer

Lepiglut for an acrylic bathtub

mof1707 · Answer

yes, are you made at home? I asked about metal elements ...

Anonymous · Answer

Familiarize yourself with the standard 60364. I already write to you that you can use the DY wire for equipotential bonding. Read about equipotential bonding: Link Link Link Here you have about equipotential bonding requirements and measurements: Link Now, hardly anyone has a metal bathtub, if you have a PVC bathtub, you do not connect it to the equipotential bonding.

mof1707 · Answer

Approx. Thanks. Just one more question, should equalizing pipes such as DY be put in a conduit or tube? Can they lie freely in the concrete (will they be poured over the floor screed)?

arek59 · Answer

I put DY in a conduit, sometimes without a conduit, depending on the type of building, application, funds, etc. PE equalizing conduit minimum CU 10mm.
The lightning protection installation should not be connected to the earthing and equipotential bar. (How badly I wrote it to correct me.)

mof1707 · Answer

Why do you think you shouldn't connect the lightning rod to the alignment rail? In my opinion, this should be done and then the whole thing should be connected to the EP. And, of course, use the appropriate surge arresters.

Connecting TNC Network to Home Switchgear: PEN Conductor Separation & GSU Strip Placement

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