Upgrading Apartment Wiring: Suitable Cable for 3.2kW Electric Hob, 800W Microwave & More

Hello

During the renovation of the apartment, I decided to replace the cable connecting the meter with the fuse in the corridor. Until now, it was aluminum 2x1 or 2x1.5. I currently pulled 3x2.5, but there was a vision of resigning from gas and installing a two-burner electric hob with a power of 3.2 KW. The house will also have an 800W microwave with a 1200W grill. Cordless kettle. Obviously, not everything is turned on together.
I would like to know if the cable I dragged to the corridor will withstand these loads. The length of this cable is 15 meters.

Cooker 3.5kW
2kW microwave
2kW kettle

Total approx. 7.5kW

With all devices connected together, this is at the junction of the load capacity of this wire.

and for how many kW do you have a contract with the electric company? probably something around 4-5kW (i.e. consumption of the order of 18:22A), so YOU CANNOT! take more energy... in theory...
2.5mm2 withstands a constant load of 25A AC

I would like to know what this endurance limit means?? Does it start to heat up or is it already warm?

With the power plant I have 4KW and a 25A fuse. How to increase it to 5KW. My main concern is the cable. Will it be right?
In fact, everything will not work at once, so in theory there will most often be a limit consumption of something around 4500W

25A is a working load so it shouldn't get hot.

Hello.
The long-term current carrying capacity of a 2.5 mm² cable with two loaded cores is only 19÷20A. The WLZ should have a minimum of 4mm², as it is the most loaded part of the installation. In addition, this section will experience the greatest voltage drop.

greetings

Well, you confused me. Because the cost of the 3x4 cable is an additional PLN 100 and additional activities.
I am generally surprised by the fact that at this moment wires with such diameters are laid, and so far I had aluminum cables 2x1 or 2 x 1.5 and somehow the installation was durable. If it wasn't for the plate for two burners, I would have stayed on this 3x2.5 cable, and that's how I see that the change is waiting for me again.
kiss

The long-term load capacity of the cables depends mainly on the way they are laid. And so for wires laid in insulating pipes 21 A, for wires laid in steel pipes 24 A, and for wires laid directly in plaster or on plaster 30 A. All the above data refer to three-core wires in PVC insulation

HeSz wrote:

The long-term load capacity of the cables depends mainly on the way they are laid. And so for wires laid in insulating pipes 21 A, for wires laid in steel pipes 24 A, and for wires laid directly in plaster or on plaster 30 A. All the above data refer to three-core wires in PVC insulation

so 3x2.5mm2 in the plaster is definitely enough, I confirm from theory and practice, I recently did a new installation myself and the cable from the meter is 3x2.5mm2, the riser on the staircase is a 5x6mm2 cable (3 phases)

Quote:

With the power plant I have 4KW and a 25A fuse. How to increase it to 5KW

You already have 5kW

Quote:

Because the cost of the 3x4 cable is an additional PLN 100 and additional activities.
I am generally surprised by the fact that at this moment wires with such diameters are laid, and so far I had aluminum cables 2x1 or 2 x 1.5 and somehow the installation was durable. If it wasn't for the plate for two burners, I would have stayed on this 3x2.5 cable, and this is how I see that the change is waiting for me again

If you are renovating the installation for a maximum of two years, leave the 3x2.5 mm² and in two years you will again incur the costs of replacing the power cord with a 3x4 mm². I am surprised that by doing something for many years you save on basic materials. The fact that 4mm² is almost 50% more expensive, but at least you don't have to worry about something breaking.

Hello.

We talk about replacing the WLZ all the time. The requirement of the ZE this section of the installation must be separately in a PVC tube . For this reason, the minimum cross section is 4mm². Some EVs impose a minimum of 6mm². Otherwise arranged WLZ will not be accepted.

Before removing the seal on the meter, you must complete the appropriate form in ZE, enter there a contractor with SEP qualifications, pay for the application and then start work.

greetings

Mariusz Ch. wrote:

Hello.

We talk about replacing the WLZ all the time. The requirement of the ZE this section of the installation must be separately in a PVC tube . For this reason, the minimum cross section is 4mm². Some EVs impose a minimum of 6mm². Otherwise arranged WLZ will not be accepted.

may i know where is this information from?
As far as I know, the cross-section is to be adapted to the contract with the ZE - I quote:
From the connection point to the main switchgear in the facility, energy is supplied via an internal power line (wlz). The parameters of wlz-here depend on such quantities as:

* amount of ordered power,
* value of the pre-meter security,
* length wlz,
* way of running the line.

and, in addition, the very definition of the WLZ:

REGULATION OF MINISTERS
ENERGY AND NUCLEAR ENERGY AND
ADMINISTRATION, LAND MANAGEMENT AND ENVIRONMENTAL PROTECTION
of April 9, 1977
On the technical conditions to be met by power installations and electric lighting devices
(Journal of Laws of 1977, No. 14, item 58)
Appendix 1
TECHNICAL CONDITIONS TO WHICH THEY SHOULD MATCH
POWER INSTALLATIONS
1. General provisions
Article 1
5) internal power line – this should be understood as the pre-counter line , connecting the receiving installation with the connector directly or through the main switchboard

I also recommend:
http://www.krystyn.krakow.pl/akt_ksia/17_5.PDF

... you took care of yourself ... If I don't know something, I don't understand it, I ask first and then I do it. You first laid the wire and then looked for a "cure for restful sleep." and now while you're cooking dinner you'll be thinking how hot my cable in the wall is... won't it burn...??? Saving 100-a few zlotys for a few years between renovations ...? it's the price for restless dreams. In the UK we give these wires in 25mm L and N size 16mm ground in TN-CS even though the wire going to the house is much smaller... Regards...

I am doing repairs myself and I am also replacing alu installations and I will tell you one thing there was no such power needed once or twice, alu was more available than copper. so, not knowing what else in my life I will buy and connect, I put the main wire 3 * 6mm2, lighting 3 * 1.5mm2, sockets 3 * 2.5mm2 and secured it with a pre-meter 25A, then I skillfully distributed the power consumption and properly selected the protections from 16A to 6A. I wish you a successful renovation .