Converting TN-C Electrical Layout to TN-CS in 80s Apartment: Practicalities and Challenges

Hello all.

The renovation in the kitchen tempted me to replace the two-wire cables with three-wire cables. There is a lot of it on the forum but there is no clear answer because there are as many theories as "specialists".

So, as in the subject, I have a TN-C layout in the apartment




and pseudo electric shock protection




I would like to convert it into a TN-CS system although I know there are rules regarding the thickness of the PEN cable etc. but here I won't change anything. because I can play electrician only in my apartment and I need a staircase, except for the main fuse in the box.
I came up with a system that for the first principle has to be protected first and then powered up. Is such a system can be accepted given that I do not have too many options.





Thanks in advance for your help.
best regards

Since we protect first where is off RI. Obligatory because there is probably a bathroom with a bath or shower in the apartment. probably these are overcurrent breakers

As if there are no unambiguous answers - this is what: https://www.elektroda.pl/rtvforum/topic3263074.html

elsitko wrote:

Since we protect first where is off RI. Obligatory because there is probably a bathroom with a bath or shower in the apartment. probably these are overcurrent breakers

An error has crept in. It was about anti-shock I corrected the error. These protections are the bridge made in contact where I think it should be made differently. As for the photo of the fuse box, I put it in order to illustrate what we are dealing with. I will deal with the switchgear later. For now, I change installations only in the kitchen and that's it. The diagram I added is the idea of switching from one system to another.
And here the question is whether such a connection / transition will fulfill its role.

best regards

Added after 34 [minutes]:

r103 wrote:

As if there are no unambiguous answers - this is what: https://www.elektroda.pl/rtvforum/topic3263074.html

A lot of interesting content but I mean the developed topic of the transition from the TN-C system to TN-CS in old blocks. I am not a specialist in this field but as I read the topic from the link, the diagrams relate to 3-wire systems and this is not TN-C we start the topic.

No less thanks for the link. I will definitely read the whole thing
best regards

Hey, I have a similar topic so I will add. Renovation of the apartment in the block of flats and new wiring. I envisage replacing the old meter box with a new meter switchboard with a euro rail. I would like to ask experts whether I can do it this way:



are the lighting circuits better before the differential?

Yansen wrote:

I would like to ask experts whether I can do it this way:

- What is the network layout?
- What is the cross-section of WLZ?
- Why there are no dedicated circuits (oven, washing machine, dishwasher, or induction hob)
- One RCD for the whole apartment is a misunderstanding

Currently, the TN-C system, WLZ 3x3.5m2, two of the circuits will be dedicated to the washing machine and oven - should they have their own RCD parallel to that in the plan?

Yansen wrote:

Currently, the TN-C system, WLZ 3x3.5m2, two of the circuits will be dedicated to the washing machine and oven - should they have their own RCD parallel to that in the plan?

I haven't heard about 3.5mm2 wire cross section, unless it's Cu?

Yansen wrote:

Currently, the TN-C system, WLZ 3x3.5m2, two of the circuits will be dedicated to the washing machine and oven - should they have their own RCD parallel to that in the plan?

As for the number of residual current circuit breakers, there is no particular indication outside the bathroom ... RCD is to double the protection in the TN system, which we provide anyway by SWZ. A matter of convenience is the greater amount of RCDs in the installation. And the cost.

wojciech_pi wrote:

I haven't heard about 3.5mm2 wire cross section, unless it's Cu?

YDY 3x4