Permissible branch distance from support to entry
Although the same PUE says that it is determined on the basis of the climatic region (for example, the number of winds, ice thickness, type of cable / wire and other factors affect), and in paragraph 2.4.19 it is said that it is determined by the strength of the support from which the branch goes ...
Therefore, it is necessary to put an intermediate support.
But in the obsolete PUE of the previous edition (6th edition), namely in clause 2.4.12, it is said: “In areas with one-story development, it is recommended to carry out branches from overhead lines to inputs with wires with weatherproof insulation. The length of the branch from the overhead line to the input should be no more than 25 m. ” - this explains why such a figure appears in all recommendations and requirements ...
In general, such questions should be asked in the power grid organization to the networks of which you will make the connection. To connect, you will be given a TU in which all the necessary actions will be described.
We raised the same question in the article. https://our.electricianexp.com/en/kak-samostoyatelno-podklyuchit-uchastok-k-elektrichestvu.html You can familiarize yourself and maybe learn something new.