How to design a database with multiple relationships?

Question

Database design

Hello. There was a task to collect all electric communications in a DB. Since I have no experience in creating complex applications, I hit a dead end when designing a database.
My task is this:
There is a cabinet, from this cabinet multi-core cables go to other cabinets where they branch out on the terminal blocks along the cores to other cables and go to other cabinets and terminal blocks. Moreover, the number of cabinets on each branch of the main cabinet is different.
Prompt how to organize a DB or give the link to the similar project. Thank you in advance.

Answer 1

Just describe the entities that you have:
cabinet (id, number, description)
terminal block (id, cabinet_id, number, description)
cable (id, cabinet_id1, cabinet_id2, number, description)
conductor (id, cable_id, terminal_id1, terminal_id2, number , description)