This, already 51 in a row, question with just such a title was asked by the reader Georgy. And I continue to publish for the "question-answer" section. Let me remind you that if you have your own answer to a question, then write it in the comments below. I and other readers will be happy to read it.
Here is the entire text of the question (verbatim):
Good day. There is a 12-lamp chandelier. It has a cord with a cross section of 0.75 for 2 wires. I plan to make a chandelier for 2 switches. The required length is available with a shvvp cord with a cross section of 0.5.
Tell me, is it possible to connect 6 lamps through this cord? Is it possible to pull out only 1 cable from the cord (remove the top insulation and remove the excess one). According to the characteristics, it should be enough. In total, the chandeliers have 12 lamps of 10.5 watts each, they work from a 220 network. There will be 6 on each switch. According to calculations, it turns out that even a section of 0.35 should be enough. Those. the essence of the work is to add one additional conductor of a smaller cross-section for 6 lamps.
I considered the issue and consulted Georgiy within the framework of my knowledge and qualifications as follows:
Hello!
If we consider the issue of power consumption, then for 6 lamps of 10.5 W each load will be 63 W with a permissible core bandwidth of 2400 W. This is more than enough for the applied load, so you are absolutely right in terms of the safety factor in the cross-section of the core.
It is forbidden to remove the insulation layer from the ball screw cord to install the wires separately. Since this design provides full protection against the voltage of the electrical circuit 230 V. If you remove the layer of insulation that interferes with you, the manufacturer disclaims all obligations to guarantee your safety during the operation of electrical equipment. Accordingly, someone may suffer from an electric shock if the insulation cannot withstand and the potential from the wire goes to the chandelier body.
I also want to draw your attention to the fact that in accordance with clause 524.1 of GOST R 50571.5.52-2011, the cross-section of the conductors in the lighting network must be at least 1.5 mm2.