Title: Chapter PEN, Protector Selection & Switchgear Diagram for Single-Family House: TN-C System

Hello
I would like to kindly request your opinion on the switchgear diagram in a single-family house.
Necessary data
- Protection in ZK3a - 32A
- The pre-meter protection is 16A - 3f
- The network system is TN-C (4x70mm? Al cable connection - 115m to ZK3a)
- Power supply to the above-mentioned connection from a straight-through pole.
- A set of valve lightning arresters GZa0.66 / 1.5kVA with grounding type TA3x7 (steel tape 30x5 - 30m) is mounted on the pole
- Distance of the connection point from the transformer 100m
- 250kVA transformer power
- Short circuit voltage 4.5%
- Steel wire 6mm? laid parallel to the cable (after 30 years maybe 3-4mm? remained: /)

I am planning to modernize the internal installation.
I have a project but it is very general and does not provide detailed information about the surge arrester, PEN distribution point, etc.
My questions ?
1. According to the diagram in the appendix, can I split the PEN after the meter (as shown in the picture) or should I do it before the meter?
2. Can I use an AC circuit breaker or do I have to buy an A?
3. Should a surge arrester back-up be used?
4. What about the equalizing connection of the gas pipe when there is no insulation insert?
5. Are there errors in the schematic? If so, what should I improve?

I will be grateful for any suggestions.

Arrester for the TN-C system
Protection between the switch and the arrester is pointless.

This page is about protecting surge arresters - hence my questions
https://blog.phoenixcontact.com/marketing-pl/...ec-i-bezpiecznik-czyli-para-idealnie-dobrana/

Yes, but what value ... the security of your protectors is in ZK, there is no point in duplicating it.

Type A RCDs are a better choice than AC but one 4P for the whole house is a bad idea.

Check what the manufacturer recommends regarding the conductor cross-section for SPD or 10 and 16mm? is enough.

Approx. I thought that the distance of the inserts from the limiter also matters.
As for the RCD, there is only one in the following appendix and it is 3F for the whole house. The photo comes from the project.
As for the cross-sections of the PE conductor from the limiter, the manufacturer writes about min. 10mm2. There will be a maximum of 20cm of 16mm? cable from the limiter to the GSU. Then a hoop for a pin earth electrode, and in the spring, a ring earth electrode and a lightning conductor will be made.
Ultimately, I am planning separate differentials for the circuits
-Gas boiler 1f A
-Recuperator 1f A
- Washing machine 1f A
-Electric kitchen 3f AC
-External sockets 1f A

piter_admin wrote:

Ultimately, I am planning separate differentials for the circuits
-Gas boiler 1f A
-Recuperator 1f A
- Washing machine 1f A
-Electric kitchen 3f AC
-External sockets 1f A

In that case, it's probably RCBO.
On the other hand, the recuperator and the heating plate, as devices installed permanently, do not require the use of circuits protected by a residual current device.

For your convenience, you should separate the circuits into separate RCDs.
And protecting single-phase circuits with a four-pole circuit breaker is asking for trouble.

piter_admin wrote:

1. According to the diagram in the appendix, can I split the PEN after the meter (as shown in the picture) or should I do it before the meter?

If possible, make a breakdown in the switchboard.

piter_admin wrote:

2. Can I use an AC circuit breaker or do I have to buy an A?

As far as I remember, AC is already banned in some western countries. In my switchgear, all RCDs are of type A, but that was my whim, because for now you can use RCD type AC as you want.

piter_admin wrote:

3. Should a surge arrester back-up be used?

Since you are going to use DEHNventil, it can extinguish the line sequence arc up to 50,000 A. Additional protection of such an SPD is completely unnecessary. The DEHNventil documentation specifies when to apply a back-up.

piter_admin wrote:

5. Are there errors in the schematic? If so, what should I improve?

Badly matched SPD. In the drawing, you connect the PEN conductor to the PE strip. While the distance between the PE and N rails is small ? 50 cm, use the SPD for the TN-C system (https://www.dehn.de/store/d?locale=en&product=951300&type=specification). You connect to the PE rail from the PEN clamp on the SPD. The overvoltage will be limited on the PE and N busbar. Here, the SPD with the N-PE module is unnecessary - something else if you had a PEN division before the switchgear with 5-wire WLZ. I do not know how big you are going to have the switchgear, but the distance between the SPD and the PE busbar is also relatively short ? 50 cm. This distance is more important than between the SPD and the GSU.
For the SPD, I would use a distribution block, not a direct connection to the RCD.

So, can the PEN of the lz be 10mm??
If :
- BMy in ZK3a - 35A
- 16A pre-meter protection
- wire from ZK to ZL 4x10mm? CU
- wlz 5x10mm? CU (free PE wire)
In the figure below, the S2 wire (L1, L2, L3) can be 10mm?, but the S3 and S4 wires must be 16mm?.

How is it possible that you have decided to use such a small (contracted) connection capacity? This is my first time meeting with the 16 A pre-meter protection. After all, it will be unusable.

piter_admin wrote:

In the figure below, the S2 wire (L1, L2, L3) can be 10mm?
But the S3 and S4 wires must be 16mm?

Yes. Cables from the terminal with the grounding symbol and PEN are exposed to high surge currents that can come directly from the lightning protection system to the SPD via the GSU. In addition, all phases are connected via a spark gap and a varistor to the double ground / PEN terminal. During the operation of the SPD, all phases are connected to the double PEN terminal for this time in order to equalize the potential difference.
PS
Then finally decide what WLZ should be. There is no such thing as a free PE vein or hanging in the air. If you are going to split the PEN in front of the switchgear, you cannot use SPD for TN-C. Must be for TN-S with N-PE module.

You have TN-C. What about grounding? Is you like Fundamentowe, otok or cuś?

emigrant wrote:

How is it possible that you have decided on such a small (contracted) connection capacity? This is my first time meeting with the 16 A pre-meter protection. After all, it will be unusable.

I found such a security.
I will try to change this protection when taking the meter out. The contracted capacity is 14kW

emigrant wrote:

PS
Then finally decide what WLZ should be. There is no such thing as a free PE vein or hanging in the air. If you are going to split the PEN in front of the switchgear, you cannot use SPD for TN-C. Must be for TN-S with N-PE module.

The situation is developmental, hence my questions.

As I wrote earlier.
For ZK 3a there is a 4x70Al cable + 6mm? steel wire. There is only 4x10mm?Cu (but only 2m) between the ZK and the meter, and a new 5x10mm?Cu wire is laid from the meter. That is why I am writing about the fact that the PE conductor is free, i.e. not connected. But nothing prevents you from distributing the PEN in the ZL or earlier in the ZK when the meter is raised outside the ZK

Added after 5 [minutes]:

kortyleski wrote:

You have TN-C. What about grounding? Is you like Fundamentowe, otok or cuś?

At the moment there is a 6mm? steel wire in ZK and a 1x3m pin earth electrode connected with a 30x5 hoop to the GSU. In the spring, a ring earth electrode will also be made.

piter_admin wrote:

But nothing prevents you from distributing the PEN in the ZL or earlier in the ZK when the meter is raised outside the ZK

There is no such option in Tauron.

opornik7 wrote:

piter_admin wrote:

But nothing prevents you from distributing the PEN in the ZL or earlier in the ZK when the meter is raised outside the ZK

There is no such option in Tauron.

So I have to understand that Tauron does not agree to the implementation of the PEN division in ZK or ZL and the only place of division is RG at home?

Yes buddy. It is as you wrote.

So, can I use the Dehn 951300 (TN-C) limiter when separating the PEN in the RG?
If so, please provide information on what conditions I have to meet in order for it to be done properly.