Self-supporting cable СИП 4 4х16 technical characteristics field of application

Approximately until the 2000s, the air power transmission lines (LEP) under construction were mounted open. What does this mean? The transmission line consisted of four open wires: the 1st, the 2nd and the 3rd phases, plus the 4th "zero" one. The wires were pulled between insulators mounted on the supporting poles at such a distance to prevent a short circuit.

The circuit was not ideal. Firstly, in conditions of strong wind, the wires sometimes overflowed, throwing out sheaves of sparks. Such "fireworks" could easily disconnect small settlements. Secondly, moist air is not the best insulator, so the power losses were significant.

Later, special self-supporting cables began to be used for laying air power lines, such as SIP 4 4x16, the technical characteristics of which allow avoiding both electricity losses and small accidents.

Decipher the marking

What do the letters and numbers mean in the cable designation? Like any wire, the 4/16 CIP has technical characteristics that can be read by marking.

Self-supporting

Not every wire can be used for laying overhead lines. At tension, the insulation material and the metal from which the conductors are made, undergo significant loads. The strength of the cable should be such that it does not burst under the influence of its own weight, tension force and third-party factors.

Insulated wire

The figure "4", standing immediately after the abbreviation of the CIP, denotes the type of construction of the wire (there are five types of SIP products in total).

4 x 16

The cable has four separate veins each of 16 mm ² each.

Device

What is the conductor of CIP 4 4x16. The technical characteristics of any power cable depend on the design, location of the main elements and the material from which they are made. Each vein of SIP consists of seven separate wires, and six outer ones are wrapped around one central wire. The central element is made of a special aluminum alloy, which provides high tensile strength, the outer element is made of aluminum.

Each of the four cores is packed in its own insulating sleeve made of polyvinyl chloride. And, finally, all four cores are covered with one common shell of the same material.

Specifications

For the product 4/16 SIP 4, technical characteristics are determined by its purpose: to transmit a current of sufficiently high power, to allow the installation of power lines in the air without additional supporting devices and to withstand any atmospheric influences. The latter task is solved by using in the manufacture of insulation of a wire of a special thermally stabilized polyvinyl chloride, resistant both to temperature changes and to the action of ultraviolet solar radiation.

Declared by the manufacturer for CIP 4 4x16 technical specifications, the power of the transmitted current is as follows:

- working temperature corridor: from -55 ° С to + 55 ° С;

- installation at an air temperature of - 21 ° C and above;

- temperature increase during operation up to + 95 ° С;

- maximum permissible voltage - up to 1 kV;

- design life of a wire not exposed to short circuit - not less than 45 years;

- permissible power of the power consumers: at a voltage of 380V - 38 kW, at a voltage of 220V - 66 kW.

Application area

The laying of air lines for a small street and the system of branching from the pole of the power line directly to the house are the main areas of application of SIP 4 4x16. The technical characteristics of this cable allow it to be used in any climatic zone of Russia, including for the electrical supply of coastal structures, when the aggressive impact of sea salt water harms even the power lines.