13kW 3-Phase Installation: Optimal Cable Cross-Section, Replacement & Connection Queries

Question

Hello, I wonder if I should replace the cable to the meter from the point (photo below) the ordered power is 13kW -3 phases, the cable looks 4x6 or 4x4 (measured on 6mm insulation). Below is a photo of an old working installation. In the cottage, I have already replaced the entire installation,...

kkas12 · Answer

Change professionals.

Lukasino · Answer

Thanks, but this answer did not help me, I no longer use the services of professionals. Through these experts I do everything myself. All that's left for me is this cable.

MrMazi · Answer

I have a copper 5x10 mm2 at home for this power. It is a cross-section that allows you to increase power at any time, without replacing it. Al is cheaper, but if you have to do it yourself, think how to process a 10mm2 cable and how to process a 35mm2 cable. You'll notice the difference :) You will most likely have to replace the cable yourself. Then you need to call or write to ZE that the installation has been renovated and you need to install a seal. They will come, set up, and exhibit invoices.

Lukasino · Answer

OK thanks , I checked I have 6mm2 Cu, so it is enough for this power, I do not plan to change the power, I think I will leave it. You can close.

kkas12 · Answer

In my opinion you are doing wrong. Since you have replaced the entire installation, be consistent and replace the rest.

Anonymous · Answer

If the connection is in TN-C, it should be min. 10 mm ^ 2 because this is the standard of the PEN cable and you will probably have an RCD there because you change the entire installation. But probably most electricians have not heard about this requirement, it is not fully formulated. Each copper wire / cable has its aluminum counterpart. For example, 10mm ^ 2 in Cu is 16mm ^ 2 in Al . And you will surely not get burned. You will have cheaper. Appropriate terminal strips are enough in the distribution board and then you can do the rest in the distribution board with the Lgy rope.

Akrzy74 · Answer

Majority electricians which I know, there is no major problem with the interpretation of the relevant entry, so please justify and indicate the source in the technical literature where you can read that the load capacity of these wires (Al and Cu) is identical in all conditions - Cu and Al cables have their counterparts. I have a hunch that is almost certain that you lied, wrote nonsense - you get a warning for something like that.

Anonymous · Answer

The first TF manufacturer catalog .... everyone knows. Compares YAKY and YKY cable. YKY with a conductor of 10mm ^ 2 has the load capacity 75A in the ground and in the air 63A . On the other hand, the YAKY cable with a conductor of 16mm ^ 2 in the ground 77A and in the air 61A . Both cables in PVC sheath, the catalog is available on the manufacturer's website, so everyone can check it out. The differences are of the order of 2A, so with a clear conscience it can be said that 16mm ^ 2 in Al is the equivalent of 10mm ^ 2, I meant the equivalent of copper and aluminum. If I'm wrong, correct me. As for the cross-section of the PEN, one should distinguish between PEN in the network and in the installation. As for the network requirement at least 10mm ^ 2Cu or 16mm ^ 2Al, it must be respected!

kkas12 · Answer

Please provide the source of this requirement.

Anonymous · Answer

Source: Link

kkas12 · Answer

And since you are writing about networks, do not refer to the standard 60364 because it does not apply to networks.

Anonymous · Answer

My point was that when creating this standard, the specialists probably had protection against breaking the PEN conductor on the lines in the LV network, which brings tragic consequences. Greater probability of wire breakage in the overhead line than the wire hidden under the wall. And in old installations there are PEN wires (old nomenclature: neutral wire, eg 2.5mm ^ 2, for me they should be called that because they have two functions.

elpapiotr · Answer

No, buddy lordpakernik , have one function. The function of the neutral conductor in an installation adapted to zeroing.

Anonymous · Answer

According to the PBUE No. 6, it is different as you say. The discussion deviates from the topic.

kkas12 · Answer

See what is the title of the thread. So for the last time I am asking my friend not to mix up networks with installations. And leave PBUE alone.

Akrzy74 · Answer

I didn't mean the manufacturer's catalog, but let my friend be - I also wrote: in all conditions, because if they are equivalents, they can be loaded in the same way - protected against overload or short-circuit, and in this matter even a few Ampere is important (for cables with larger cross-sections it is no longer a few Amps), therefore we have different protection characteristics. Yes, maybe everyone knows, but not lordpakernik, that you should compare cables from the entire range - the entire table, and not in a narrow range. I took the trouble and checked - I compared most of the tables - from a given series - with Al and Cu cables, also for short-circuit currents, taking into account the cable laying methods, soil resistivity coefficient - cable reduction coefficients for all cables from a given series . It should have been written that a colleague was comparing two specific cables and not that each wire / cable has its counterpart ... I give my colleague a warning!

janek1815 · Answer

I would like to know how to properly connect Al with Cu. Can you explain what these suitable terminal blocks are?

Anonymous · Answer

There is a requirement that up to the point where PEN is split into PE and N, the cable must be at least 10mm2 copper or 16mm2 aluminum, so the WLZ must be made of conductors with such cross-section. because I understand that it is about WLZ and not the connection between the pole and the seatpost on the building

kkas12 · Answer

Not that I would be picking on, but it's not quite like that. From the sentence formulated in this way, it can be wrongly concluded that the installation in the TN-C system (except for the main switching station of the facility) must not be performed. And that's not true anymore. PN-HD 60364-5-54: 2010 Low voltage electrical installations Part 5-54: Selection and assembly of electrical equipment Earthing, protective conductors and wires protective connections However, this applies to installations performed today. However, when we have the old (existing) power supply with a smaller cross-section, there is also nothing to use the existing cable and carry out further installation according to the new rules.

Anonymous · Answer

A copper wire Cu 10mm ^ 2 is a Cu 10mm ^ 2 wire. The difference is only depending on the type of location of this cable / wire, whether it is in the ground or in the wall. But let it be a warning. In old installations, where it is sometimes necessary to combine Cu with Al, wago cubes are helpful. When you connect the riser with the ASXSN connection, you use special al-cu clamps. If you connect al to cu on screw terminals then use cupal washers. There are such vertical rails for TH35 rails in the switchboard.

Anonymous · Answer

Yes, but if he wants to replace an existing WLZ, he should probably comply with these requirements. And he was just asking for an exchange. After all, such installations will have to be picked up and then problems may arise.

kkas12 · Answer

Of course, when it comes to replacing it, it depends on the abovementioned standard. This does not mean, however, that it is impossible or even impossible to use cables with a larger cross-section, suggesting that today we have 13kW. And tomorrow?

Anonymous · Answer

This is exactly why I wrote that it is minimal cross-sections.

Lukasino · Answer

I decided to replace, they just need to send a letter of conditions, I want to put 4x35 AL to from the insulators. I do not know if the ZE will agree to the division of PEN in front of the meter, that they do not allow them in some areas. I will throw the box with the counter in front of the door.

13kW 3-Phase Installation: Optimal Cable Cross-Section, Replacement & Connection Queries

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