Adding Multiple Differentials to One Circuit for Kitchen and Laundry Room Expansion

Hello

I had a power box in the boiler room, which I expanded because an electrician once made only two sockets for me in the kitchen. I didn`t pay attention to it before plastering and painting.
The boiler room is located behind the kitchen wall.
Later, I added a laundry room next to the boiler room, and electricity had to be supplied from somewhere without having to break down the walls.
I did it as in the diagram. now I have doubts.
Can I put the differential there (not yet installed) on the washing machine? can there be two on one circuit, what about selectivity?
Can I throw away these B25 protections from the RG?

Or maybe connect the differential switch before the main one and install another one in the switchboard in the boiler room and an additional one for the washing machine? in this option, higher costs by another differential, which I would prefer to avoid.

One differential for the entire house is a very inconvenient solution. It would be best if it was selective, then you add normal ones to individual circuits and you know that in the event of a disturbance, the entire house will not go out.
If you don`t want to incur too much costs now and you only add a differential switch to the washing machine circuit, install one with a differential current of 10mA - then there is a greater probability that it will turn it off (in the event of damage to the washing machine circuit), but it is always a lottery.
Remember that the rest of the installation also has some leakage and a higher current will always flow through the differential circuit of the entire house (excluding special cases) than through the differential circuit of the washing machine.

This installation is screwed up. You have two options: what you suggest, i.e. connecting before your differential, but replace B25 with a 3-phase differential and a second output, take this main differential and insert the FR there, only protect the three-phase socket with it, and use it for other circuits requiring this, buy single-phase differential switches. I.e. two for the house and two for the boiler room.
And don`t turn on the lights in ordinary rooms for differential switches, because if the equipment fails at night, you won`t even turn on the lights in the house and you`ll have to wait until sunrise.

Do I see correctly, the cable is 5x1mm2? If so, it`s not enough. As for the rest, my colleague Retrofood gives good advice.

There is no point in going through the costs and putting differentials on differentials and then wondering what is wrong. with the circuits. I suggest leaving the differential circuit as in the drawing and securing the washing machine with a relief switch, e.g. B16. And it doesn`t matter whether it is in the RG or in the laundry room. Faults related to leakage to the casing are really rare. Maybe more often when the equipment is being repaired or e.g. flooded with water, so there is no need to panic and take more precautions than necessary. Regards

ANDYW6 wrote:

Do I see correctly, the cable is 5x1mm2?

NO. 5x4mm cable


However, I will probably give up this differential only for the washing machine, and instead of B25 I will put a differential there and plug it in before the main one.

djlukas wrote:

ANDYW6 wrote:

Do I see correctly, the cable is 5x1mm2?

NO. 5x4mm cable


However, I will probably give up this differential only for the washing machine, and instead of B25 I will put a differential there and plug it in before the main one.

But ultimately, I would propose this other variant: FR instead of the main differential, and then two 1-phase differentials for the protected circuits in the house and 2 in the boiler room, and a separate three-phase differential for a 3-phase socket.

Hello!
My colleagues who advise you to throw away the B25 protection of the boiler room distribution board probably don`t know what they`re talking about. DO NOT DO THIS!
My previous speaker is probably most right. If you have space in the main distribution board, put an FR disconnector in front of the differential and, before this differential, lead these circuits to the boiler room distributor, securing it with a B25A fuse. The differential switch does not protect the device or installation from overloads or short circuits phase (L) - neutral (N), and that is what the overcurrent switch is for. Put a second differential current there and everything will be OK. However, do not use a differential current of 10mA, as someone recommended earlier, because it is not enough for a washing machine. We protect devices such as washing machines, refrigerators and large engines (pumps, etc.) 30mA or even 100mA, but the latter cannot be treated as protection for indirect touch, which must be 30mA.

mati_mat wrote:

Hello!
My colleagues who advise you to throw away the B25 protection of the boiler room distribution board probably don`t know what they`re talking about. DO NOT DO THIS!

No one suggests this, at least that`s my impression, which is why I didn`t write about it.
However, multiplying overcurrents is also just a problem. Moreover, if there is no room for overcurrent devices, a variant of the differential switch with an overcurrent module must be used. Of course, each circuit MUST be secured, there is no doubt about it.
I think you know that FR is not a safety device, just a disconnect.

Can I use this FR?: LC FR 303 63A.

It seems to me that these 63A do not play a significant role here

When talking about the second differential, I am talking about the one for the washing machine and I suggested that the circuits for the boiler room should be moved from before the differential, so there is no "double" :)

retrofood wrote:

I believe you know that FR is not a safety device, just a disconnect.

If this was information for me, I know it and that`s why I suggested installing it so that I could turn off the entire installation with one switch. The current differential, which serves as protection against electric shock, is a bad solution for all circuits, but of course it is not prohibited and someone probably wanted to provide protection and the main switch at the same time. (my guesses)

Added after 2 [minutes]:

djlukas wrote:

Can I use this FR?: LC FR 303 63A.

It seems to me that these 63A do not play a significant role here

you can use and 63A is the maximum current you can pass through it

mati_mat wrote:

retrofood wrote:

I believe you know that FR is not a safety device, just a disconnect.

If this was information for me, then I know and that`s why...

No, not to you, but to the author of the topic as well as the whole post. even the first sentence.
Only when I read it now did I see that it was awkward...

I know, I know that FR is a disconnector. I am a beginner electrician who has just obtained his qualifications. I know my installations are screwed up. the electrician who did it only did three circuits per house
1 circuit - living room, room, sockets and light,
2nd circuit - bathroom, kitchen, hall, sockets and light,
3rd circuit - room, vestibule, sockets and light.
I don`t know about the upstairs because it hasn`t been renovated yet and nothing is connected, but I think it`s similar because there are only two systems left in the box. If I manage to run additional wires to the conduits, I will do it my own way


do I have to leave the B25? After all, I have protection for this circuit in the boiler room, so if something happened, it should go away there. and there are also pre-counter ones. and I would have room for these single-phase differentials.

As a beginner electrician, do not allow a situation like your electrician`s to happen again by breaking, among other things, entry in the Journal of Laws 2002 no. 75 item 690 § 188 section 2 without using separate minimum 4 circuits and where sockets and lights are not combined on one circuit

Added after 7 [minutes]:

and you have to use (theoretically) B25 because you are protecting, for example, the cable that powers this distributor. For example, when tampering with this switchboard, you make a short circuit and may damage the power cable (unless the meter prevents this from happening). ). Secondly, you will load all circuits to the value of the fuses and they will not work and you will "burn" the power cable. The only thing is that you can give more than B25 for this 5x4 cable, even because of the second situation described above, where it will fail.