Romek_xx wrote:
At these points, the colleague contradicts himself ... and if there is a zeroing system in the block, what does the colleague advise?
If there is a designed zeroing, then zeroing or replacing it with one that complies with the applicable regulations.
As for my answer, I am not contradicting myself, because my answer "Surely not zeroing" was about the question "Which is better ...?" Hence the answer that zeroing is definitely not better :)
Romek_xx wrote:
Sorry, my colleague, despite my several years of electrical practice and my qualifications, I have not encountered a zero-reset installation in which a "zero" fuse would be used, because it may be life-threatening, as a colleague himself mentioned, and do not meet the basic protection against electric shock. Well, unless the installation was done by some home-grown electrician.
I have unfortunately met several times. Of course, as you wrote, these were trimmings made by home-grown electricians who were advised to connect the pins with zero.
It scares me that someone in the public forum says that "zeroing is better for grounding" and advises you to do zeroing without knowing if it is even possible to do in this particular case.
Hence my somewhat philosophical statement, which aims to make people realize that, contrary to the general belief, protection is a very important thing in electricity and more complicated than it seems, and any mistake or bad advice can be overpaid with health or life.
Romek_xx wrote:
And what are the regulations that specify that 10 or 16 mm wires should be connected to a socket with a zeroing applied?
The current PN-IEC 60364 standard
It specifies the minimum cross-section of the PEN conductor as 10mm2 for a copper conductor and 16mm2 for an aluminum conductor. Thinner ones must not be used. Therefore, if thinner cables cannot be used, such cables should be lead to the sockets so that they comply with the above-mentioned standard.
In this way, the legislator wanted to force the non-use of zeroing.
On the other hand, thinner ones can be used, but only when the PE and N conductors are separated in the cable
Romek_xx wrote:
To apply zeroing, the transformer must be properly connected and the proper protection applied to the utility grid, not regulations. The protection method is written in the marking that the colleague will find on the Trafo MV / LV, the use of protection in the receivers behind the transformer is dependent on this, and not on the regulations and assessment of whether it is cheaper and whether it pays off for someone. If someone is killed by electricity, or a pacemaker is damaged, the prosecutor's office and an explanation of who and why screwed up such installations and why, not to mention "forget about compensation", because the insurance will check the cause of death for sure, will remain.
We think exactly the same thing, only that we try to put it on paper a bit differently - more or less communicatively
If you had read all of my statements, you would have come to this conclusion
))And as for transformers - there are no problems with the use of the TNJ-C, TN-S or TN-CS protective network because all transformers have a grounded neutral point, except for the only type of IT network, which can still be found only occasionally and only in industrial plants . Therefore, when creating a TN-CS type protective network, we can only follow the standard, because it forces the neutral points of transformers to be grounded and protective installations in TN-S or TN-CS type residential houses.
Jacek "Plumpi"
Added after 12 [minutes]:
forniceps wrote:I did not think that it is such a debatable issue. You suggest that an electrician would be the best, and I will add that I was inclined to do so from the beginning. Since the choice was an electrician, now another one comes to mind, namely, how can I be sure that the first advertisement is competent? Do power plants or power plants that provide me with voltage have "their" proven professionals, or maybe in a housing cooperative I can find someone who in the end colloquially says "ground my computer"?
Exactly as you write - Elektrownia, Spółdzielnia
And also ask for permissions. In addition to the typical operational ones, ask for the authorization to measure electric shock protection, because not every electrician has it. Well, it should also have a supervisory "D"
Most electricians who only have "E" - ci are only for "black" work and repairing existing installations.
On the other hand, those with "D" and measuring tubes know the rules. Although they are generally not allowed to design new installations, they have the same knowledge as those with building licenses to design.
And to design the network, you need special building qualifications.
