Cable Selection for 11m2 Attic Room Lighting: 2x1mm2, 18W Fluorescent Lamps & Wiring in Conduits

Question

Hello I have a question, in the attic I have an 11m2 room built of GK inside for insulation, mineral wool used (room under construction) now I have a question because I want to connect a 2x1mm2 cable (i.e. the rigid wire) from the attic lighting cable and give this room for lighting where 2...

epi92 · Answer

Hello.
I am still a student of an electrical technical school, but from what I remember when I was working on vacation at construction sites with installations in houses and flats, the lighting allowed for the YDY PŻ 3x1.5mm cable, and for the YDA PŻ 3x2.5mm contacts. Sockets connected in series.
If these cables are to be laid on finished walls, it is suggested in cable trays for aesthetic reasons.
However, if the walls have not yet been finished, it is recommended to use conduits or directly to the wall with cable holders.
Maybe I'll be an electrician too; Mr.
Regards and a Happy New Year

lukaszpol26 · Answer

And where will the PE protective conductor be ??? It should be 3x ... mm2

duzydiablo · Answer

And this is a big disadvantage if I put it without PE ??

kkas12 · Answer

It is unacceptable.

duzydiablo · Answer

Ok, tell me if 3x1mm2 is enough for such lighting?

duzydiablo · Answer

In general, I wanted to do it so that I connect the scales to the existing cable, then to a single ordinary switch, and then to two fluorescent lamp holders.

Miwhoo · Answer

Anyway, the PE wire [yellow-green] should be connected to the energy receiver, no matter if it will be a lamp, a new socket or an industrial machine ...

Therefore, a 3x cable should be led from a single switch, 4x in the case of a candlestick, and if the luminaire is additionally equipped with e.g. an emergency module that requires constant power supply, then a 5x cable. Cross-section and circuit protection appropriate to the power of the luminaire. According to what was written by col. Kkas12.

duzydiablo · Answer

And one more thing for the light to give a 10A circuit breaker and 16A for sockets? Can I put 10 sockets in a row with a 3x2.5mm2 cable max ?? A maximum of 200 watts will be connected to the socket

wiesde · Answer

As standard, in residential installations, up to 10 sockets on one circuit or up to 20 light outputs can be made. But it is the maximum allowed by the standards. Functionally, it is better to have fewer sockets and light outlets.

duzydiablo · Answer

And security such as I wrote ??

wiesde · Answer

Assuming that the lighting will be powered by the YDYp cable with 3 x 1.5 mm2, the fuse can be even 13A, and with the sockets powered by the YDYp cable with 3 x 2.5 mm2, it can be 16A. of course, this is largely simplified, because the cable cross-section is also significantly influenced by the length, arrangement and type of the powered installation (but what I wrote above is sufficient).

retrofood · Answer

Yes, up to two lamps !!! Some news. Interesting Buddy, how many installations have you made. And a colleague has heard something about the short circuit loop impedance? Because so far I do not know the length of the wires and whether sometimes even a metallic short circuit will not trigger the protection. I warn you against such advice.

wiesde · Answer

OK Colleague retrofood is right with this impedance (it is a very important criterion for the efficiency of the installation - actually determining, apart from the quality of workmanship and insulation resistance) and hence my second opinion about the conditions. In some cases, even a metallic short circuit may not trigger the redundant protection.

antko · Answer

Well, what did your colleague learn about the question you asked? (if the 2x1mm2 cable is not too thin to power the light point). Various statements show that 3x1.5mm2 should be given. I would ask where to connect the PE wire (yellow and green) to the bulb holder. Nobody asked what kind (type) of power the colleague has at home (TNC or something like that), but everyone says that there should be a PE conductor. I have a cottage and only two wires go from the meter to the light sources and to the sockets, this is where I should connect this PE without replacing the installation.

retrofood · Answer

You don't have PE. So what do you want to connect? This is a forum for electricians and you need to have at least a minimum of knowledge to discuss. I close the topic.

kkas12 · Answer

Where to connect the protective conductor to the holder (luminaires in protection class II) has already been explained many times and ad nauseam. And new circuits should be made like this.

Cable Selection for 11m2 Attic Room Lighting: 2x1mm2, 18W Fluorescent Lamps & Wiring in Conduits

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