Assessing 16kW Single-Family House Switchgear Design Without Lightning Protection System

Question

Hello everyone. After reading the forum for several weeks, I started drawing a switchgear in a newly built single-family house without a lightning protection system. Please assess whether it is properly designed. The house is powered by a cable line to the box with a meter (security B25A). The...

kSmuk · Answer

Is your colleague a contractor, investor or designer?

stachu30 wrote:
16kV power allocation

Or maybe kW?

stachu30 wrote:
Please assess whether it is properly designed.

Is not.

1) The lack of an RCD for lighting in the bathroom disqualifies the drawing

2) What is the purpose of a colleague using a 4-pole surge protector, if the separation point is in the switchgear?

3) Lack of descriptions of wire sections for other circuits

4) No indicators for the presence of phases

Equipotential bonding?

kozi966 · Answer

This is not a pattern! This is an demonstrative drawing .... Does a colleague have a building license to design electrical installations? What is a 16kV tnc network? There is no information about the cross-sections of conductors (full and not residual). No information about the rooms. On what basis are the cables sewing the apparatus designed as 4mm ^ 2? 2.5mm ^ 2 cable to power the oven / induction hob? What are the connection conditions? In what system is the arrester connected and what are the distances of the appropriate cables from the GSW bus? Will the colleague fly to the connector in the event of a burnout of the protector and a short circuit of the varistors? A few questions at the beginning.

jann111 · Answer

What is this ground foundation?! No, it's not painted properly. Designers should be designed by a designer, anyone can paint, but not for every purpose.

INTOUCH · Answer

I have seen such solutions in industrial switchboards many times.

elpapiotr · Answer

and PN-HD 60364-5-54: 2010 p. 542.2 Earth electrodes (standard withdrawn and replaced by PN-HD 60364-5-54: 2011 - English version)

jann111 · Answer

It is a pity that my colleague does not distinguish between grounding and grounding. But I understand that this is a fleeting side effect of Poles' night talks. (flowers)

elpapiotr · Answer

Well, yes - and I thought that this concept was not known to my colleague, so I hurried up with the information. PS. Polish night talks are sometimes very informative, and the language also sharpens

stachu30 · Answer

I am an investor. The installation will be done by a familiar electrician. There is not much experience in these matters, so I asked for advice here on the forum.
Finally, the installation will be checked by a licensed electrician with measurements.

It was, of course, about 16kW (Czech error).

Connection conditions:
YAKY 4X70mm ^ 2 cable connection from the nearest pillar of the LV-0.4kV overhead line to a built-in connector, integrated with the ZK1x-1P metering and billing system.
Main protection 3x40A, pre-meter protection 3x25A (ZKP).
Installation separation point from tnc to tns in the receiving installation. This point must be earthed.

Conductor cross-sections
- for switchgear 4x10mm ^ 2
- 3x2.5mm ^ 2 socket cables
- lighting cables 3x1.5mm ^ 2
- connections in the switchgear cable 4mm ^ 2
- ground wire from the PE bus to GSW 1x10mm ^ 2

In the drawing, I drew the power supply of the bathroom lighting circuit with off. residual current P302 40A 30mA. Or maybe it would be better to use an additional difference only for this lighting?

So in my case, use a 3-pole surge protector? I was suggested by other switchgears discussed in the forum, the electrician also offered me such a solution.

Phase presence controls are not required, but I will consider installing them.

All installations will be made of plastic pipes, the shower tray and bathtub will be made of acrylic.

I wrote the cables connecting the modular apparatus that they will be 4mm ^ 2. I suggested a few topics about switchgears. Use other?

The 5x2.5mm ^ 2 wire will be too weak to connect an electric cooker? Apply thicker?

There will be 7 meters from the GSW bus to the PE bus in the switchgear. The arrester is connected to the tns network separated from the tnc (according to the connection conditions).

In case the protector burns out, I will fly to the connector. In this case, you will know that something has happened. If we use a fuse protection, in the event of a fuse burnout, we will be deprived of protection, and we will not look into the switchgear because the installation is working.

elpapiotr · Answer

Nonsense, repeatedly explained on this forum. And let a familiar electrician learn more, since the investor is to know more than he does.

stachu30 · Answer

This is exactly what I have written in the connection conditions ...

Łukasz-O · Answer

Apart from the command to ground the split point. Since when can TN-S be made from TN-C?

INTOUCH · Answer

Either I have a fever today and my mind is clearly not working or I don't understand something.

fighter · Answer

I understand that a colleague will read something, then he will teach his friend an electrician and then this electrician will be checked by another electrician whose friend will not take it because he is too expensive and probably does not trust him. :D Buddy, you can read 3 years old posts on the forum to draw something there and in the end, the execution will be precarious. I feel like laughing when an investor wants to be a designer and at the same time wants to be smarter than an installation fitter and probably also a surveyor. Because surely when something spartolone is going to be, you have to convince the person who is supposed to give the stamp that it is fine and you can sign it, because why rework it because there is too much work.

Łukasz-O · Answer

For a fever, I recommend Pyralgina or contact your doctor or pharmacist :D What does your colleague not understand? Maybe the pictures will help - the first ones from google: Link Now do you know why?

INTOUCH · Answer

After all, I have TN-S or TN-CS at home. Connection at TN-C.

Łukasz-O · Answer

You have TN-CS.

INTOUCH · Answer

I have already trained. Link Quote from the site.

Łukasz-O · Answer

It's a bit of self-deception.

TWK · Answer

To be honest, this is the first time I meet such a division. For me, there is TN-S if 5 wires come out of the transformer station, all the rest are TN-CS. And wouldn't it be better to take an experienced electrician right away to perform the installation? Or let the one with no experience (has a qualification certificate at all?) Do it under his supervision?

Łukasz-O · Answer

And correctly, it is meant to be.

stachu30 · Answer

Thank you for all the advice, but I will stay with my "friend" electrician.
I do not think that it is worse than an electrician with a stamp, because even this is where "flowers" are found in the installation. And it's hard to find a good specialist.

Well, gentlemen, any drawing suggestions?

malina998 · Answer

If a friend stays with an friend electrician and trusts him, our advice and advice are probably unnecessary. An electrician should know what is wrong, what is good and what needs to be changed.

elpapiotr · Answer

Nooo. having such a scheme, I think he can handle it

Anonymous · Answer

Do you have friends, the diagram from the standard - where is it? Another diagram with sources in the form of windings is also only illustrative.

Łukasz-O · Answer

The transformer is not visible, but there is an inscription: A separate neutral conductor and a separate protective conductor throughout the system networks . I sharpened nets on purpose.

Matarnik · Answer

I can only add this much on my part to the drawing: Of course, the TN-S system is a 5-wire network system from a transformer with earthed points N and PE. (Section 312.2.1 TN systems of the standard) How do you know that there is no need for a lightning protection system - since there is no design and no calculations. Your installation does not exist from the electrician's point of view because: a) you do not have a design made by a designer with qualifications in the appropriate specialization - I suggest reading the Construction Law Act (obligations of the investor and designer) b) the layout of the supply network in your drawing is inconsistent with the Connection Conditions - the measurement result is already negative at the design stage. The designer and electrician, the tester and the electrician know where the receiving installation begins. Change the electrician and have a professional get the project done before you drown your money down the drain. If an electrician makes an electrical installation according to a decent project, no flowers will appear.

Anonymous · Answer

You have what you have, and the naming issue here is not essential. Because in both cases it is metallic PE connection with transformer. Most call it TN-S. I have adapted to this majority. TN-S is ok, also TN-CS is ok In my opinion, the TN-CS chip is much better. Because the PE conductor is taken from TN-C is controlled. No PEN = no electricity, immediately noticeable and repaired. Nobody will notice a break in the EP. a break in PE makes the TN-S pseudo TT. The IPZ does not work, it loses its parameters, because the PE earth electrode is not a metallic connection with luck.

pawkur18 · Answer

TN-S can be made from TN-C.

ronwald · Answer

I recommend page 39 in the book Electrical installations in buildings by professor Bruno Lejda, ed. WNT ISBN 978-83-7926-018-8.

Assessing 16kW Single-Family House Switchgear Design Without Lightning Protection System

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