Cable Selection for 35-40 kW Power Connection at 50m Distance: Comparing Single vs. Split Cables

I am going to increase the power connection because I run some business and I need about 35-40kw and hence I have a question what cable is needed to lead it from the fuse box to the production hall, i.e. at a distance of about 50m? Two machines will be used, one with a power of 22kw and the other with a power of 15 kW and I do not know whether it is better to run one cable underground under both machines or maybe it would be cheaper if I made two sockets at the meter and a separate thinner cable, of course, underground. in this field I am just green and I have one more question what should be the protection with such power and can I increase the connection power from 15 kW to 40 without having to put my own transformer?

Moderated By retrofood:

There was no consent to delete the moderation post. A kilowatt [kW] is written a bit differently.

First, determine your power allocation from your energy contract.
If it is sufficient, the cable should be min. 5x 25mm ^ 2 and protection 125A.

What is your network diagram and where / is / will be a PEN distribution site?

A power supply project is to be carried out for all works. And it is the designer who will decide about the cables, sections and other matters.

Added after 45 [seconds]:

michalekk1 wrote:

What is your network diagram and where / is / will be a PEN distribution site?

And what does this have to do with it?

and why 5-wire cables? for now, they are 4-wire and can't they remain so? in addition, 5x25 costs PLN 55 per meter and 4x25 PLN 39

We start the sentence with a capital letter. [retrofood]

Added after 2 [hours] 29 [minutes]:

Is it possible to run a second power connection and a second meter on the farm? Wouldn't it be cheaper than the reconstruction of the old one and only about 20 kW would be ordered on the new one? Whose are the costs of such a reconstruction? I understand that the fuses on the building are mine and the box because now there is only such an old small box in the wall and for the cable from the pole to the box, who pays? And a project for all of this has to be?

jarekvip99 wrote:

and why 5-wire cables? for now, they are 4-wire and can't they remain so?

It depends on the layout of the installation you have installed and whether you have a breakdown of PEN into PE and N (where you have this breakdown).

In this topic, no one will answer you specifically about the conductor cross-section. As someone mentioned earlier for this you need:
1) ZE consent to increase the connection capacity,
2) appropriate design made by the designer.
Regarding the design and the local vision, you will be able to debate the economic costs and the manner of implementation.
The basis is safety and proper execution according to art.

greetings

Now I have a connection power of 15kW and a fuse in front of the 32A meter and 25A behind the meter and a 4x6mm cable everywhere, will a 15 kW motor working at 90% of power be able to walk on it? If not, is it possible, for example, to install only larger fuses so that the engine works without any problems and leave the wire?

Buddy, the problem is not small.
15kW is a current of 25A, long-term load capacity of the 6mm2 cable is about 30A, depending on how it is laid.
So if you start a 15kW motor on your connection with a power of 15kW and a 25A protection, the 25A protection will work for you because when you start the 15kW motor, a current will flow even several times greater than the rated current of the motor and the protection.

What if you start something else at the same time or even if the engine starts somehow?

Increasing the connection power, nothing else is left for you.

jarekvip99 wrote:

If not, is it possible, for example, to install only larger fuses so that the engine works without any problems and leave the wire?

You can leave the wire, the only question is whether it is made of copper or aluminum. If it is alu, the cable needs to be replaced.
As for the protections themselves, you will not replace the 25A - their dimensions make it difficult for you.
Another issue is the selectivity of security features that should be maintained.

jarekvip99 wrote:

and why 5-wire cables? for now, they are 4-wire and can't they remain so? in addition, 5x25 costs PLN 55 per meter and 4x25 PLN 39

We start the sentence with a capital letter. [retrofood]

Added after 2 [hours] 29 [minutes]:

Is it possible to run a second power connection and a second meter on the farm? Wouldn't it be cheaper than rebuilding the old one, and only about 20 kW would be ordered on the new one? Whose are the costs of such a reconstruction? I understand that the fuses on the building are mine and the box because now there is only such an old small box in the wall and for the cable from the pole to the box, who pays? And a project for all of this has to be?

The tariff of charges for the consumed electricity is different for private entities [single-family houses] and different - more expensive for business activities, connecting to the "private" meter is a breach of the electricity supply conditions included in the contract.

Since one machine has 22kW and the other 15kW, the rest is 3kW. The question is whether you will not need more than 3000W with both machines working.

Another issue is introducing disturbances to the network by starting motors.
I do not know if there will be an active and reactive energy meter in your case, since the vast majority of the requested power is inductive loads.

Report to ZE first and ask for details.

Regarding the connection, it depends on the type of network and the requirements of the local electricity district.

Keep in mind that for each "supposed" kW you will have to pay about 130 PLN, which is about 3250 PLN in your case.

You can submit an application for new connection conditions, it costs nothing until you sign the contract. There will be all the answers to your questions. Knowing the methods of operation of several local areas, I think that there will be no problem with the conditions. Trouble will begin if the local transformer station is unable to provide such an increase in power ...


Either way, go first or call ZE.

Miwhoo wrote:

Report to ZE first and ask for details.

And there is an end to this.