Setting Up Switchboard with B16 and B20 Fuses in Large-Panel Apartment: Grounding Queries

Hello.

I have an aluminum installation in my apartment, two wires P and N come out of the meter.

Half of the installation in the apartment was converted to 3-core wires and from what I can see PE wires are connected to N. I have no idea if it's good, but I don't see any disturbing symptoms. It's all tied together quite primitively. I would like to sort it out and set up a small switchboard with B16 and B20 fuses (so far there is one fuse for the whole apartment, which is not even automatic).

From what I've read, you will need a differential current protection for the washing machine, but you can also get stupid here, because there are plenty of schemes and it's always ok for some, unacceptable for others.

However, I am wondering about the grounding itself, because I am going to connect an induction hob that requires such grounding. I received the idea of grounding this equipment to the water line in the kitchen, but I didn't like it right away, because first of all, it's not allowed, and secondly, pulling the cable through half of the kitchen is an exaggeration.

So if I bridge PE to N at the fuses before the differential and run 3x 2.5 mm (N, P, PE) through the entire hall to the kitchen and connect the hob to it, will it work?

Don't get any more ideas like this.
Ask an electrician to do it properly.

That's why I'm asking you for it You have a lot of knowledge on this subject, so I'm asking for advice...

Maybe I'll shorten it .... Where to get the grounding to connect the induction hob? I can handle the wiring diagram.

First of all, get the induction hob out of your head in a single-phase apartment.

As for the "grounding from the waterway" - may God's hand protect you. You mustn't do that.

Then why the possibility of connecting the board to 230V and one phase after bridging? I make household appliances in a chain store and sell induction hobs on a regular basis. 80% of them even go to old tenement houses. No one has wanted to return anything so far, and I doubt that everyone would fly to ZE and fire another thousands for pulling 400V.

I expect simple answers to questions, not "don't do this" "don't do that". If I asked how to replace the wheel in the car, you would send me to a mechanic because no one would like to write even 3 sentences on the subject.

portal2 wrote:

Then why the possibility of connecting the board to 230V and one phase after bridging? I make household appliances in a chain store and sell induction hobs on a regular basis. 80% of them even go to old tenement houses. No one has wanted to return anything so far, and I doubt that everyone would fly to ZE and fire another thousands for pulling 400V.

I expect simple answers to questions, not "don't do this" "don't do that". If I asked how to replace the wheel in the car, you would send me to a mechanic because no one would like to write even 3 sentences on the subject.

Buddy, answer the question first - what boards and with what power do you sell for these old tenement houses.
The second question - what is the standard power allocation for a single-phase dwelling, and what protection does this single-phase powered plate require.
Perhaps then you will understand the meaning of our words.

portal2 wrote:

Then why the possibility of connecting the board to 230V and one phase after bridging? I make household appliances in a chain store and sell induction hobs on a regular basis. 80% of them even go to old tenement houses. No one has wanted to return anything so far, and I doubt that everyone would fly to ZE and fire another thousands for pulling 400V.

I expect simple answers to questions, not "don't do this" "don't do that". If I asked how to replace the wheel in the car, you would send me to a mechanic because no one would like to write even 3 sentences on the subject.

In Polish connection conditions (reality) it is not possible. The gentleman in the store will say anything to sell the goods The topic has been rolled over many times.

A single-phase powered board requires 16 or 20A protection, because the board consumes half of what it consumes at 400V, i.e. 3.6 - 3.7 kW. In the rounded 16A, it works "half a whistle", and it is enough for me because the cost of boiling a liter of water even on a cut plate is lower than gas or a ceramic plate. Each .... I repeat, each hob (at least for 3 years) with the possibility of connecting to 230V from the automatic machine consumes lower power. In some, you can even set the current protection to the Amperage we want. I sell it, the installer drives and connects it. And so far, on dozens of discs, no problem whatsoever. It is enough to inform the customer that when connected to 230V the hob works "half", etc.

You want to force me to prove that my 25A on the meter will not pull 16A?

Can anyone answer the question I asked? Will there be more questions from the so-called "d..." side?

Okay .... since there is a problem with the word "plate" I will replace it with "oven" which has practically the same connection power

For some, a Polonaise is enough, for the other a Mercedes, but that's by the way.
The answer to the main question was in post #2, that's it.

portal2 wrote:

You want to force me to prove that my 25A on the meter will not pull 16A?

Can anyone answer the question I asked? Will there be more questions from the so-called "d..." side?

Okay .... since there is a problem with the word "plate" I will replace it with "oven" which has practically the same connection power

Then do what you think. Why bother us when you already know better. I'm closing the topic.

I open the topic at the express request of the author.

Quote:

The PE conductor is only one element of this protection.
In order to protect the PE conductor, the other elements of the protection system must be operational. A PE wire connected somewhere will not protect.
Recommendation - connect PE somewhere there is the risk of electric shock to users.

And that's pretty much it.
I'm closing this thread as the problem in the title is false. The author expects the recipe as if to make a sandwich, and this is not possible, this is a comprehensive issue, requiring knowledge far beyond the scope of the post.