PV cable 1: how the wire works, product specifications

PV cable 1 can be used when laying open (in cable trays and channels, pipes) and in a hidden way - under a layer of plaster, so it is widely used when organizing wiring both in industrial facilities and in everyday life. The series of cables is popular not only because of the abundance of installation methods, but also because of the low cost with good technical parameters of the relative other cable products.

Explanation of the abbreviation

PV 1 wire is an outdated marking of this cable product, corresponding to GOST No. 6323 of 1979, where:

• "P" - the general purpose of the product, that is, the wire;
• "B" - the presence of an insulating layer made of polyvinyl chloride (PVC);
• "1" - the presence of a class of flexibility, which determines the maximum bending radius of the product, as well as indicating the presence of one core in the cable.

Currently, there is a new standard published in 2010, R 53768, which introduced a new designation marking of the PV cable - PuV, where "y" denotes the installation, that is, its additional area application.

Design features

The wire of this series has single-core products, which allows only one communication line to be laid. In the production process of PV 1 (PuV) cable, only copper is used, subject to the tinning process (flux coating).

PV wire has a simple design and consists of the following parts:

1. A conductor made of copper, which is made in the form of a single-wire or multi-wire structure. The choice of structure depends on the cross-section of the copper wire, if this parameter is in the range from 0.5 to 10 mm², then the core is made in one piece, and from 16 mm² and above, then the vein is twisted from several wires.
2. Insulation made of PVC, with additional color coding, which determines the scope of application of a particular product. This marking can be found in GOST 22483 and GOST 6323−79.

Technical characteristics of PV wire 1

Among all the performance characteristics of cable products, the most relevant for the PV 1 series are the following parameters:

• the minimum bending radius, which should be equal to ten or more of the outer diameter of the wire;
• linear resistance of the cable - not less than 0.1 Mohm / km when operating the line in an environment up to + 70 ° C;
• the possibility of laying both in one line and in a bundle with other cables;
• large construction length - from 25 m (in most stores it is sold in the form of a bay);
• high resistance to shock and mechanical stress;
• long service life - 15 years;
• climatic modification - UHL.

Along with good performance, products of the PV 1 series have a number of limitations that appear during operation and installation work:

1. The PV 1 series cable can be used in the temperature range from - 50 ° C to + 35 ° C with air humidity up to 100%.
2. The maximum allowable voltage depends on the type of current flowing in the system: with direct current up to 1 kV, and with alternating current up to 0.45 kV with a frequency of 0.4 kHz.

UHL equipment

UHL is one of the climatic versions of electrical, radio-electronic and other equipment manufactured on the territory of the Russian Federation, which, together with another, is included in GOST 15150-69, where:

• "U" - operating conditions, that is, areas with humid, hot or dry, but moderate temperature conditions;
• "HL" - additional operating conditions. Indicates that the product can be used in cold climates, but within the range of -50 to + 70 ° C.

It is displayed as letters and recorded in the last group of characters. Climatic modification UHL is typical for all cables of the PV 1 series.

Wire modifications

PV 1 series cable is produced with conductors of various cross-sections and structures:

• mono-core structure - copper wire with diameters: 0.5; 0,75; 1; 1,2; 2; 2,5; 3,0; 4,0; 5,0; 6,0; 8.0; 10 mm²;
• seven-wire structure with diameter: 16; 25; 35 mm²;
• 19 wire structure diameter: 50; 70; 95 mm²;
• 37-wire - with a diameter of 120 mm².

In the process of evolution of installation and installation cables of the PV 1 series, a number of modifications were developed that have individual characteristics and technical parameters:

1. BPVL cable is a specially designed modification for use in the aviation industry. It is used in the process of connecting stationary equipment with constant voltage below 0.5 kV and alternating voltage up to 0.25 kV, with a frequency of 2 kHz.
2. PVBbShv is a copper cable used in low-current and power cable networks with voltage up to 1 kW and a frequency of 50 Hz. APVBbShv - analogue with aluminum conductor.
3. Cable KSPV 4 × 0.5 is a product consisting of four copper cores and double insulation (inner - polyethylene and external - polyvinyl chloride), used to power alarm and video surveillance systems with a cross section of 0.5 mm². It is usually painted white. A distinctive feature of the cable is that for powering a product can be used not only with a cross-section of 0.5 mm², but also 0.4; 0.64 as well as 0.8 mm².
4. PVZ is a single-core copper cable with a multi-wire structure, intended for use in networks with alternating voltage up to 0.45 kV with a frequency of 100 Hz and systems with constant voltage up to 1 kV. a feature of the cable is its high current conductivity due to which it is able to withstand a load of up to 41 A.
5. Automatic reclosing is an installation wire with an aluminum core with characteristics identical to PV 1. These two wires differ from each other only in the operating conditions, that is, the automatic reclosure can be used exclusively in networks with alternating voltage up to 0.4 V and a frequency of 50 Hz.

Cable cost

The cost of the cable varies from 1100 to 5250 rubles per 1 km and depends on the number of cores and their cross-section. Before purchasing cable products, including representatives of the PV 1 series, you should perform the following steps:

1. Inspect the cable surface from all sides for defects and visual damage. They should not be on a quality product.
2. Cut the insulating layer at a distance of 13 cm from the edge of the cable and check the product for ease of peeling off the insulating layer. According to GOST 6323−79, in the process of cutting PV 1, the insulating layer from the current-carrying conductor should be separated smoothly without breaking the layer. If you had to make an effort when removing it, this means that you have an expired cable or a product that was stored in violation of the conditions specified in the standard.
3. Check the conformity of the diameters of the current-carrying conductor and the outer sheath. To do this, you need to measure the cross-section of the core.
4. Inspect the tag for the following information: product length, coil weight, manufacturing plant and date of manufacture.

If the actions taken are completed, and the results are positive, then this product can be safely bought. However, this is not all, before using the PV 1 wire directly, it must be additionally tested.

Cutting off a 5-meter piece of cable from the purchased coil and placing it in a container with water for one day, and then removing the insulation on both sides. After that, you need to take the power supply and apply a test voltage of 2.5 kV to both ends for 15 minutes. At the final stage, take a tester and measure the resistance of the product.

Taking a roller equal to ten diameters of the PV 1 cable, check the bending resistance of the product. This test is carried out as follows: the cable is taken and passed through the surface of the roller, and at the exit it is inspected for defects. If they are not found, then the product is suitable for use..