Correct cable cross section for 75m underground, 18kW load, 32A protection?

Hello, I need to lay a cable in the ground between the house and the connection box. The distance is 75m, and I have a connection power of 18 kW (32A protection in the box).
The only problem is with the cross-section because I do not know whether to give 4x10mm or 4x16mm.
Please help so that by saving money I do not have problems later.

It will be more reasonable to give 4X16mm².

4x10mm2 is already with a large reserve. On another note, looking at 4x16mm2 there may be a problem with connecting under the meter.

Well I still have a problem, for my taste also 4x10 should be enough, but a colleague claimed to give better 4x16 and hence the question. But I have two different answers. Maybe someone can throw me some formula how to calculate it (I'm mainly concerned with this distance). Thanks colleagues for your interest.

goooooogle
http://pl.wikipedia.org/wiki/Spadek_napi%C4%99cia_(electricity)
what do you mean you have a connection power, it seems to be a single-family building ?
You don't select the cable cross-section according to the technical conditions received (because I guess that's what you do) only to the expected demand

cross section of about 5.6mm2 comes out of the formula, this is an approximate value, which is why I suggested 10mm2.

Dycha is definitely enough, there is no need to exaggerate. Yes 16mm2 always better just going by this stock reasoning, we will come to 35mm2 which is the diameter of the overhead line.

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From the other side looking at 4x16mm2 may be a problem with the connection under the meter.

Kolego flaber007 to the meter you will connect even 25mm2, with this there is no problem.

Once again, many thanks for your interest. After the last three posts I have decided to buy 4x10mm².
Greetings.

Hello
It should be not four but 5x10mm and the meter box grounded.

robsonsw wrote:

Hello
It should be not four but 5x10mm and the meter box grounded.

This is me having a question for you Fellow: what has a fart to the windmill. There are different network layouts TN,TT - does that tell you something?
The basic question was about the cross-section of the cable and not about the type of network.
It would be foolish to pull a copper cable with an additional protective conductor if you can throw in the trench cooper /or if/ at the meter to separate and make a separate ground.

Łukasz-O wrote:

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From the other side looking at 4x16mm2 there may be a problem with the connection under the meter.

Kolego flaber007 to the meter will connect even 25mm2, with this there is no problem.

Kolego ŁukaSZ-O it is possible that even 25mm2 will go in, but the problem is on the side of the ZE - for example, in the area where I work they have recommendations not to connect cables with a cross-section greater than 10mm2.

Colleague Luke-O is right, there are different types of networks. In my case the type of network N-N is TN-C, and in the terms of connection I have a four-wire cable with division of PEN to PE and N at the switchboard at home, and I have to make a grounding at the building. So I made up my mind that I'm going to buy a cooper and strap it around the foundation. In addition, I will put out a reinforcing wire from the foundation somewhere and weld it to the cooper and the grounding should be like this.

flaber007 wrote:

Kolego LukaSZ-O it is possible that even 25mm2 will go in, but the problem is on the side of ZE - for example, in the area where I work they have recommendations not to connect cables with cross-section greater than 10mm2.

Kolego first time I hear about such a practice in ZE. The fact that what ZE is custom but this already passes the human electrical concept


What if someone has a power allocation of, for example, 25kW* - he has to buy transformers??


*- I did not calculate the cross section in relation to power, I gave at random.

Actually, you would have to think about the matter in terms of future energy consumption, 10mm2 is easily enough for 18 KW, but if I preferred to have a larger reserve and if it was not a big price difference I would take 16mm2, and when it comes to connecting to the meter is a problem for people from the power industry because they do it .

origin wrote:

in fact, you would have to think about the matter in terms of future energy consumption, 10mm2 is easily enough for 18 KW, but I myself if I would prefer to have a larger reserve and if it was not a big price difference I would take 16mm2 and when it comes to connecting to the meter is a problem for people from the power industry because they do it

Kolego is a big price difference.... As for the connection it is not done by the ZE people only by the investor and see further hired electrician.

It pisses me off that advice is given by people who have no idea about the procedures and the trade itself. GET OVER IT!!! With this advice of yours taken from a "do-it-yourself electrician foreman" type guide, you are unknowingly misleading people. Go about your business!!! And leave the electrical work to the professionals! So far the last two tips are a skit/comedy.

Once again I have to admit that colleague Luke-O is right, I will have to connect the cable as an investor to the box, the electrician from ZE will set only the meter and fuses in the box, and as for the cable I wanted to give at the beginning 16mm & 2; just in case, but the price difference between 10mm & 2; and 16mm & 2; is more than 1000 zł. And that's why I wanted someone more experienced than me to comment on whether by giving 10mm² I'm not burning stupid because although I have all the necessary licenses I'm just an electronics engineer. As for future plans, first of all, I do not think that I will ever radically increase the connection power, and on the other hand, the 18kW that I have ordered for myself is still for a single-family house is with a large reserve. Thanks again to everyone for engaging my question.

As for the power of 18kW, the phase currents for such power will be about 26A with resistive load in each phase. So a wire in terms of current load 4x10mm² or 5x10mm² is sufficient. On the other hand, meters are built for the corresponding rated and overload currents and since ZE does not recommend transformers it means that this power can be measured by direct measurement! You can use, for example, a C52, C520 meter with parameters of 25/100A.
The voltage drop for such phase currents will be
ΔU%=100xP.peak.xl/δxsxU²=100x18000x26/54x10x400=0.009%

Thanks again for your interest .

Firstly-if it is a connection then there must be a project for it.And in the project must write what kind of cable it is to be.
Secondly, it is not clear what kind of cable we are talking about here.Aluminum or copper.In my opinion, the use of Cu cable on such a section is unnecessary disposal of cash.

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4x10mm2 is already with a large reserve. On the other hand, looking at 4x16mm2 may be a problem with the connection under the meter.

This kind of cable is connected directly to the meter? Very strange,because I always connect to the strip first.

ekaand wrote:

First of all-if it is a connection then there must be a project for it.And in the project must write what kind of cable it is to be.
Secondly, it is not clear what kind of cable we are talking about here.Aluminum or copper.In my opinion, the use of Cu cable for such a section is an unnecessary disposal of cash.

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4x10mm2 is already with a large reserve. On the other hand, looking at 4x16mm2 may be a problem with the connection under the meter.

This kind of cable is connected directly to the meter? Very strange,because I always connect first to the strip.

Let it be and first to the strip....
As for the ,,second" then the ,,10mm2" should be enough to guess what element it is, unless a colleague recently connected a 10mm2 YAKY , "first to the strip...". .

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unless a colleague recently connected 10mm2 YAKY ,,first to the strip..."

Of course not.I understood the allusion.As for 10mm² Cu, it is known with this default as noted flaber007 .However, I still think that it is worth considering the location of YAKY 4x16mm cable² because of the price.

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ekaand wrote:

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Secondly, it is not clear what kind of cable is being discussed here.Aluminum or copper

Then the YDY 4X10 cable - this is probably a well-known symbol. .

jorgkrab do you want to say to put YDY to Earth?

ekaand wrote:

jorgkrab do you mean to say to lay YDY to Earth?

YKY