Choosing the Right Wire Thickness for 2 KV Boiler: 1.5mm, 2.5mm, or Thicker?

Who can help me :I want to connect a 2 kW boiler and I need to run a cable but I don't know what kind of cable should be 1.5 or 2.5 mm, or maybe thicker who can help me?

2kW is a current of up to 10A, so 1.5mm? copper is enough.

And for the bulbs 3 times 100 volts is 0.75 kW enough in this case? For this boiler the 1.5 will be enough, as it will be running all the time? Greetings

If it's a longer section then you can give 2.5mm² to the boiler, it won't do any harm - current flowing in a conductor of some resistance causes heat to build up in it, i.e. a loss.

When designing the installation, it is assumed that the current density in copper conductors in the loaded section may be 6 - 10A / mm? constantly, and in the sections loaded occasionally, but for a short time, it should not exceed 16A / mm?. The load depends on the quality of the insulation and cooling conditions, moreover - e.g. in pipes where several pairs of wires are flying together - there should be a lower load, while in an overhead installation, where the wires are hanging apart from each other and are well cooled, higher densities can be assumed.
The copper resistance is 0.0175 Ohm * mm? / m, so a cable with a cross-section of 1.5mm? and a length of 10m (2x5m) has a resistance of 0.116 ohms, i.e. the current flow of 8.7A to the 2kW / 230V boiler will generate 8.8W of power in it, which in such a section should not heat the cable by more than 1 degree Celsius above the ambient temperature, the start power is 8.8 / 2000 = 0.44% of the supplied power.
Do you already know how it is designed?

I'm going to go off topic. I don't quite understand these calculations.

I have a 2.1 kW/230 V boiler, 2 m long cable. What cross-section should it be? As of today I have it connected with 0.75 mm², but the wire heats up quite a bit.

1.5 mm² will suffice .
This is stated in the post above .

boruurob wrote:

For today I have 0.75mm2 connected but the cable heats up quite well.

Are you playing with grenades too? You are brave. Just don't cry after you burn up the hut.

I don't understand the question, is 1.5 enough????
I can understand people who have no knowledge at all and are trying to do something on their own. But to ask if 1.5 mm is enough, when you know that 2.5 mm is better, and the difference in buying a section of a few metres is a few zlotys on the whole wire, is asking for trouble. A thicker wire will always be a better wire, a little supply is better than not enough.
Revised[T.M.]

The socket circuits are 3x2.5 mm² wire, while the lighting circuits are 3x1.5 mm² and that concludes the discussion.
The topic is closed.