Cable lines - screen bonding / 20.10.2025

Solid bonding of cable screens

AC 50/60 Hz power cables can be divided into two main groups:✅ single-core cables;✅ three-core cables. 1️⃣ Single-core cables, when bonding screens on both sides, have closed circuits of screens. The core currents (Ic) by their magnetic field induce AC 50/60 Hz currents in the screens (Is) – they are called circulating. Currents pass through

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Cable lines - not seriously / 17.10.2025

Wooden cable drums

The cable industry does not stand still and is constantly developing. New materials, new types of cables and cable products, new methods of design and calculation are emerging. However, some things in the cable industry remain unchanged from year to year – we are talking about cable drums (reels). All over the world, in the

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Cable lines - various topics / 13.10.2025

Cable side wall pressure

The calculation of cable pulling forces is one of important section of the design documentation. It assumes at least the following calculations:✅ cable pulling forces (should be no more than 30 N/mm2 for a cable with an aluminium core and no more than 50 N/mm2 for a cable with a copper core);✅ pressure on the

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Cable lines - not seriously / 01.10.2025

Cable insulation extrusion towers

When applying insulation, it is necessary to keep the high voltage cable in an upright position for a certain time to avoid ovalization and other negative effects. If we know the recommended time, then we understand that the required height of the extrusion tower will be proportional to the desired cable production speed. Hence the

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Cable lines - joints and terminations / 25.09.2025

Cable joints

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.

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Cable lines - screen bonding / 22.09.2025

Earth continuity conductor

Today we will not talk about alcohol (“bar”), but about a conductive element called:✅ equipotential bar (bar, bus);✅ earth continuity conductor (ECC). Questions arise:1️⃣ why do we need such a bar;2️⃣ how to provide equal distances from the bar to all phases A,B,C;3️⃣ how to calculate the optimal bar material and cross section (Fb). Unfortunately,

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