The question with such a title came from the reader Alexander.
I remind you that this is already the 32nd publication in the series "question-answer on electrical installation". You can familiarize yourself with some of the past parts by clicking on the links after this publication.
The text of the question itself sounded like this (literally):
Hello. The instructions for the electric oven say that you can only connect to a single outlet. I don’t understand why? After all, the nodes all the same from the whole kitchen converge in the junction box. If there is overheating of the wires, then it will be everywhere. In theory, one should look not at the number of outlets, but at the quality of the outlet, at the cross-section of the conductive elements. Why, then, do they write about one outlet in the instructions? Tell me, can I connect to the 4th socket? I have an overhead socket with 4 sockets. I connect the oven and other appliances there.
I reviewed the issue and advised Alexander within the framework of my knowledge and qualifications as follows:
Good afternoon!
It's all right oven is a sufficiently powerful electrical equipment that creates a large load on electrical circuits. In the standard household connection dedicated power limit and the level of consumption of standard electrical appliances cause inadequate wiring cross-section.
As a rule, it is cable cores 1.5 - 2.5 mm2that will not be able to provide power to the oven together with the rest of the electrical equipment for fire safety reasons. Therefore, many manufacturers in the device passport require the installation of not only a separate outlet, but also the laying of a separate line from the switchboard, installation of a separate circuit breaker and RCCB or RCBO.
If you connect an oven with a power of 5 kW to a four-point outlet together with an electric kettle, multicooker or bread maker, then the line really may not withstand overload. At best, the overheating circuit breaker will trip, at worst, the wire will burn. In the course of burning electrical wiring, there is a threat of fire spreading to adjacent furniture and interior elements.
In practice, there really is a category of heating devices that are allowed to be connected to common sockets together with other devices. As a rule, this equipment with a capacity up to 3.5 kW, but it is not suitable for every apartment. In rooms with old wiring, overheating of the system or tripping of the circuit breaker can occur from the joint operation of a low-power oven with the same electric kettle.
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P.S. Link to some past parts - Part 31, Part 30, Part 29, Part 28, Part 27, Part 26.