"two circuits on one fuse" - words of an electrician regarding the installation.

Question

Hello, My wife and I designed the arrangement of sockets and lighting in our apartment under construction. Following the instructions found on the Internet (including in Elektroda), we divided the installation into circuits (I don`t want to go into details). The electrician who was to perform...

Miniax · Accepted Answer

If you have a lot of space in the switchboard (for the switchgear), and possibly money for additional meters of cables, then of course the most functional solution may be to create a separate lighting circuit for each room (i.e. a separate fuse for each room). However, in your case, two lighting circuits are enough (there is no point in having fewer, because, as you have already written - one short circuit and Egyptian darkness), only if you decide to use only two, then it is best to make them so that in the event of a failure, the adjacent rooms are on a separate circuit, or colloquially speaking, make it crosswise. If it is connected to one fuse, then it will officially be one circuit and it will not matter much how it is connected - as long as it is good (well-selected protection, wire cross-section, etc.) However, as you have already noticed, currently creating one lighting circuit for all rooms is not a very sensible idea and is pointless.

czesiu · Accepted Answer

Switching off fuses does not happen very often, in a small apartment one would be enough, after all, no one will get lost or fall down the stairs.
On the other hand, the cost of additional security is several PLN (if there is still space in the switchgear).
As for the number of circuits, I suspect there will be two, one cable will go to the right of the switchgear and the other to the left

.
I would approach it like this: the customer is our boss, if you want two, let him do two and that`s it, it shouldn`t be a problem.

kreslarz · Accepted Answer

In such an apartment, several circuits are usually performed. One for lighting, the second for plug sockets with a low (theoretically) load, the third for the bathroom (washing machine) and possibly the fourth for the kitchen (electric oven). At the expense of more wires, this basic scheme can be expanded indefinitely, adding independent circuits for individual lamps, sockets, etc. Here you should consider the sense and costs of such fragmentation of circuits. The electrician should do what is in the project or what the investor wants, but the basic assumptions are in the first paragraph. How you come up with it is up to you, but there should be a design and the contractor must stick to it.

Anonymous · Accepted Answer

The number of fuses doesn`t really matter.
Fuses only blow out in the event of an accidental short circuit.
If your friend has S-s on the cage, regardless of the number of fuses, the one on the cage will blow out anyway. lack of selectivity. There will be no light in the entire cottage anyway.
The only importance for repairs. Because then you can only turn off some circuits. But it probably doesn`t matter to my friend.
Bronek

el-amator · Answer

Thank you very much for your quick replies!

We provided the installation diagram in July, and the conversation with the electrician took place in October, when the walls had just been built. Everything could be done. Then he convinced me that it is not worth making more than 2 circuits for lighting (originally we wanted to have more). Unfortunately, I didn`t know then that they should be crosswise... And after talking to him today, I now know that they are not (he mentioned that it is right/left). "The customer is our king", but unfortunately it is too late to change - the plaster has already been laid.

During today`s conversation with the electrician, a red light went on when, in response to the question whether there were separate circuits in the kitchen for the dishwasher, refrigerator and a third one for the other sockets (i.e. as it was in our diagram and arrangements with it), I heard that half of the kitchen is on one circuit and half on the other!!! When I started to investigate, he went to the switchboard, counted the fuses and based on that (!!!!!) he concluded that it was as in the diagram (i.e. 3 circuits - just as I wanted). I don`t know anything about electricity, but the way of reasoning is peculiar...
I read on the elektroda forum that I do not need to get an installation design (it is not written down in the contract), so I will probably check the circuits logically when I take over the apartment, i.e. one fuse is on and I will check with a lamp/tester which socket has electricity.

I will also mention that, on the advice of this electrician, we removed the oven socket from the diagram (a separate circuit) and now I have the impression that we have a smaller selection of equipment (if there was a socket, we could choose regardless of the connection method, i.e. a 230V socket or together with a hob underneath "strength").

Miniax · Answer

I wouldn`t worry about that. This is not an obligation, just a convenience. As my colleague Czech has already written, failures in lighting circuits are rare (especially now that we are moving away from traditional light bulbs), so I wouldn`t worry or nitpick about it. To start construction, an electrical installation design is necessary. It should include, among other things, an installation diagram in individual apartments and the electrician should first rely on it. However, if you hired your own electrician for your own apartment, he should fully take into account your suggestions that he received before starting the work and then possibly agree them with the designer to make appropriate changes to the project. Of course, an electrician performing an installation on a private request (as is probably the case in your case) should provide you with full documentation regarding the installation - photos of the cable arrangement, a schematic diagram, and a description of the individual circuits. As a rule, the rule is: if there is money, it is better to have something than not to have it

el-amator · Answer

Of course, I have no intention of complaining about it - I agreed, it`s my loss. Besides, the apartment is not big, so if one side fails, the other side will still illuminate something (provided that the second fuse is installed...). We didn`t hire our own electrician! We submitted proposed changes to the developer (an amateur diagram + description), which he accepted. We do not know what the further fate of our schemes was. The developer must have given them to the contractor, because he used them during the October meeting with the electrician (to which he invited me to discuss our plans). Whether a real project was based on them - I don`t know. Today I asked him if I would get it when/after picking up the apartment; he replied (confused) no. We do not have excess money, and we assumed that it is cheaper to do a little more (in excess) before pouring the plasters than to redo it later. That`s our whole philosophy on this topic

el-amator · Answer

There were further complications related to the reception of the apartment :-(

Since the matter is slightly different, I started a new topic:
Apartment acceptance: How to check whether the installation complies with the design (circuits)?

"two circuits on one fuse" - words of an electrician regarding the installation.

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