There are cable lines, there are overhead lines. However, there are also mixed lines consisting of both cable and overhead sections. On such mixed lines, the question arises as to how best to equip a transition point. There are a lot of issues there:
➡️ where to place the set of cable terminations and of which type;
➡️ where to place the set of surge arresters;
➡️ how to lower the cable;
➡️ what should be the grounding impedance;
➡️ what about the automatic reclosure of the mixed line;
➡️ do we need current or/and potential transformers;
➡️ do we need switching devices (disconnectors, load switches etc);
➡️ do we need communication channels and which ones are better to use;
➡️ do we need security, video-control, protection from intrusion;
➡️ do we need any power supply for the equipment;
➡️ etc.

Transition points are known:
✅ on the support (tower, pole);
✅ on the ground, of an open type, surrounded by a fence;
✅ on the ground, of a closed type (inside the building).

If a multifaceted pole is selected as the transition point, then there may be the following options how to lower the cable:
1️⃣ inside the pole (some 6-35 kV cables of a small core cross-section);
2️⃣ outside the support (6-110 kV cables);
3️⃣ on separate support structures (110-170 kV cables);
4️⃣ on the ground behind the fence (220-500 kV cables).

Interestingly, the passage of single-core cables through the side wall of the metal pole body may cause problems with the magnetic field and local heating. Therefore, it is important that the pole is made of non-magnetic steel.

Sometimes the transition points look like beautiful spaceships. It is also one of the few places where we can admire our favorite underground cables.