Cable couplings are one of the places where cable line damage often occurs. There are many different types of couplings, but most of them can be classified into one of two categories:
✅ Cable terminations;
✅ Cable joints.

Cable terminations are placed above the ground and can be subjected to periodic inspection, which is a good thing. Cable joints are usually located underground, and it is much more difficult to inspect them, and this can increase the number of damages to the joints. It should also be noted that the joints located underground can be under various mechanical influences:
👉 external pressure from the ground and transport (if the joints are directly in the ground, without mechanical protection from above);
👉 bending forces (if the joints are not on a flat base);
👉 tensile forces (during temperature fluctuations of the cable length, if no cable “snake” was provided).

If we do not consider laying cables in tunnels, then the options for placing joints in the ground can be divided into the following groups:
1️⃣ In covered concrete trays or bays – on special metal structures.
2️⃣ In covered concrete trays or bays – on sacks, bricks etc.
3️⃣ Without any trays or bays, and there are several options:
🔹on the bottom of the trench – on sacks;
🔹on a concrete slab – on sacks;
🔹on the mounting frame (bottom right photo).

The frame seems to be a good way to provide a flat base for the cable joint and a horizontal cable entry into the joint. I wonder why mounting frames are almost not found on MV-HV cable lines?

Please share your opinion. This can be done on the LinkedIn network – here is the link to the post. Thanks