Connection 25kW, distance from the box to the house 95m. What cable to use?

Hello everyone,

As in the subject, we have a connection power of 25kW (the house is to be entirely on electricity, i.e. heating, cooking, etc. and 10kW photovoltaics in the spring). The distance from the Enea box to the place where the home switchgear will be is about 95m. Which cable is best to use? I.e. aluminum or copper? And what cut?



Thank you in advance for your help :)


Regards

Fisqss wrote:

The distance from the Enea box to the place where the home switchgear will be located is about 95 m

How do you specify:
1- mains system
2- short-circuit loop impedance at the connection point
we can discuss it further.

Unfortunately, I don't know the answers to these questions. How can I get this information?

Fisqss wrote:

How can I get this information?

But you already have it calculated in the house project.

Aluminum for sure. Minimum 4 x 25mm2.

Unfortunately, in the project I did not find information about the layout of the power supply network or about the impedance. Generally, from what I can see in the project, electric heating was not even included. :/

Because it clearly says:
"this study does not contain connections to the building"
and the WLZ from the cable connector to the building's switchgear is such a connection.

Can we count on some help? because I am a total layman and I need to make an erbetka as soon as possible, but immediately on the target cable.

Added after 12 [minutes]:

I found another document from Enea

In the document from Enea you have everything written what needs to be done.

Grzegorz740 wrote:

In the document from Enea you have everything written what needs to be done.

The LV network operates in the TN-C system, which means that if we know the fault loop impedance at the connection point, we can continue the discussion. Without this knowledge, there is no point in writing anything.

Fisqss wrote:

Unfortunately, I don't know the answers to these questions. How can I get this information?

If the connection is made, take measurements. If not, you can rely on theoretical calculations that may be different than the result of measurements after execution.

Gentlemen, if what is obvious and understandable to you was the same for all people, then there would be no need for such a forum. I read this document and I don't understand some phrases, I don't know what is what (if I knew, would I ask about it on the forum?) The only thing I understood was that there is a 4x35 cable going from connector to connector, but I don't know if it's because Enea dragged the cable to my mailbox from my neighbor's mailbox [because that's what she did] using such a cable, does that mean that I should use such a cable? Why do they write from connector to connector?

Writing on the forum, I was counting on help and explanation literally "like a cow in a ditch". Electricity is black magic for me, and the electrician who was supposed to give it to me left me in the cold. I am a user of other forums and that's how I answer questions, but I don't do it "in advance" putting the asking person in the position of a dummy who has everything written.

Fisqss wrote:

Electricity is black magic for me, and the electrician who was supposed to give it to me left me in the cold

Then find another one, once I was accosted by a guy near the warehouse and said he was looking for an electrician..

Easiest to find there.

Fisqss wrote:

Gentlemen, if what is obvious and understandable to you was the same for all people, then there would be no need for such a forum.

You are absolutely right

Fisqss wrote:

I'm reading this document and I don't understand some phrases I don't know what is what (if I knew, would I ask on the forum?)

These "certain" phrases do not apply to you, they apply to the connection contractor who is not your brooch.

Fisqss wrote:

the only thing I understood is that there is a 4x35 cable going from connector to connector but I don't know if it's because Enea pulled the cable to my box from the neighbor's box [because that's what she did] using such a cable or does it mean that I should use such a cable? Why do they write from connector to connector?

This provision applies to the connection contractor, not you, and do not be interested in this provision.

Fisqss wrote:

Writing on the forum, I was counting on help and explanation literally "like a cow in a ditch". Electricity is black magic for me, and the electrician who was supposed to give it to me left me in the cold. I am a user of other forums and that's how I answer questions, but I don't do it "in advance" putting the asking person in the position of a dummy who has everything written.

I, twice asked you a question that you cannot answer and you have the right not to know the answer, but without this knowledge, we, as professionals, cannot write anything to you that will be true. So hard to understand?
And take your complaints and reproaches to another forum.

Fisqss wrote:

Writing on the forum, I was counting on help and explanation literally "like a cow in a ditch"

I wrote a reply to my friend - what else does the friend expect?

Case settled. Today I contacted a specialist who needed a few moments to calculate which cable would be the best having the information I put here copper cable 4x16mm2 is enough.

Well, the "professional" will charge you a lot of money, unfortunately.
PLN 2,300.00 and PLN 500.00 makes a big difference.

Fisqss wrote:

Today I contacted a specialist who needed a few moments to calculate which cable would be the best

I'm deleting this right away.
For 25mm2 aluminum, the voltage drop of this section is 8.6V, i.e. on the border, iPz is not known.

I know that the distance is large and copper will be expensive, but I'm not convinced about aluminum. The fact that the price is much lower, but there is one more detail. This cable must be pulled through the arot which was dug into the road before laying the geotextile and pouring crushed stone as the foundation of the road. The Arot is about 70 meters long and the aluminum cable needs to be thicker than the copper one, and the aluminum one is stiffer.
So that in the future there would be no problems if an increase in the power of the connection was needed, I'm wondering whether to give it with a supply, i.e. copper 4x25.

Fisqss wrote:

I know that the distance is large and copper will be expensive, but I'm not convinced about aluminum. The fact that the price is much lower, but there is one more detail. This cable must be pulled through the arot which was dug into the road before laying the geotextile and pouring crushed stone as the foundation of the road. The Arot is about 70 meters long and the aluminum cable needs to be thicker than the copper one, and the aluminum one is stiffer.
So that in the future there would be no problems if an increase in the power of the connection was needed, I'm wondering whether to give it with a supply, i.e. copper 4x25.

It is copper 25 mm² that fits, aluminum does not.
Of course, important information with problems with laying the cable at the end, because why mention it earlier?

Tomorrow we will fight with a 4x25 copper cable and pull it through a fi50 arot with a length of about 70 meters. I know that there are special lines with stockings for this, but we will do it with a steel line.
I know that there are special lubricants / gels to reduce friction but I can't find them in Poznan - can someone tell me where to look for them?

Do you guys have any suggestions/advice to get the cable pulled in smoothly?

The YAKXS 4x120 can be dry inserted into the SRS110 pipe on such a length. I think that a 6mm2 steel line + a steel sheet with a swivel will handle it perfectly with your hands (if your arot lies as it should). Do not forget to seal it from "silting"

By the way Author, see what a paradox. A moment of conversation with a specialist who would take responsibility did the trick.
On the forum, hardly anyone wants to take such responsibility because they do not know half of the important elements of the puzzle. And it's supposed to be safe!

It's just that I don't have a specialist who takes responsibility, all on the basis of non-committal suggestions...

And who will connect the WLZ on the property line? Who will submit documents to ZE? Any measurements after doing this WLZ? How are you going to go about assuming a counter without which the utility of this RBtka is zero?

Fisqss wrote:

I know that there are special lubricants / gels to reduce friction but I can't find them in Poznan - can someone tell me where to look for them

Louis dishwashing liquid