Self-supporting insulated wire SIP-4 2x16 is used only for powering electrical receivers and end consumers. Not used in overhead power lines. In the design of the conductor, there is no carrier zero core, only conductive cores. SIP-4 wire 2x16 can also be used in lighting networks in public areas.

OKPO code: 35 5332.

Name decoding

Decoding SIP-4 2x16: self-supporting insulated wire; number of aluminum conductors 2-4; the cross-sectional area is 16 square millimeters.

Features and Benefits

• Wire SIP-4 2x16 eliminates the risk of short circuit;
• Feasibility study: to reduce the cost of repair work. Due to which operating costs are reduced;
• Long service life. Subject to the requirements of manufacturers, the working period is at least 40 years;
• The overall dimensions of the suspension are reduced.

Application

SIP-4 wire 2x16-0.6/1 is used in air networks with a rated operating voltage of 20 and 35 kV at an industrial frequency of 50 Hz, room category 2 and 3 according to GOST 15150-69. Self-supporting insulated wire SIP-4 2x16 can be used in climatic zones marked Y and X (temperate and cold climate). It can also work in a chemically aggressive environment on the territories of industrial facilities and saline coastal marine and other areas.

Provides normal operation provided that the operating temperature is within the allowable range. SIP-4 is an environmentally friendly product, does not emit chemically harmful active substances into the environment above the maximum permissible concentration.

Wire Composition

• The SIP-4 2x16 cable is made of aluminum core, the twist pitch does not exceed 45 cm.
• The number of conductive wires varies from 2 to 4;
• The cores are round, sealed and multi-wire;
• The material of the carrier zero core is aluminum alloy. Stranded from round conductors;
• Twisting of insulated conductive wires goes around the carrier wire;
• The insulating material that is present on the neutral core and as a protective sheath of wires is light-stabilized cross-linked polyethylene (XLPE insulation).

Specifications

The main characteristics of the SIP-4 cable 2x16 mm2:

• Rated operating voltage - 0.6 / 1 kV;
• The maximum allowable operating temperature for emergency and thermal overloads is 130˚С;
• SIP-4 wire 12x16 mm 2 has a bending radius of not more than 7.5 times the cable diameter;
• The manufacturer's warranty is valid for 3 years from the date of commissioning of the conductors. Not later than 6 months from the date of manufacture;
• Scope of tests and verifications. conductors must withstand the test AC voltage industrial frequency of 50 Hz over the entire construction length for 5 minutes after being kept in water, the temperature of which varies in the range of 20 ± 10 ˚С for 10 minutes. For self-supporting insulated conductors - 4 kV, protected for a rated voltage of 20 kV - exposure 6 kV, for 35 kV - 10 kV. The breakdown test alternating voltage with a frequency of 50 Hz of the protective insulating sheaths of conductors after being kept in water at a temperature of 20 ± 5 ˚С for more than 1 hour is: for conductors with an operating voltage of 20 kV - more than 24 kV, for 35 kV - more than 40 kV;
• Climatic modification type B, room category 1,2,3 according to GOST 15150-69;
• Permissible operating temperatures range from -60˚С to 50˚С;
• Installation and repair work is carried out at a temperature environment not lower than -20˚С;
• The specific ohmic resistance of current-carrying conductors at a temperature of 20˚С per 1 km of the conductor is determined in accordance with GOST 22483-77;
• The specific volume resistance of the insulating material at a long-term permissible heating temperature of the conductive core is more than 1 1012 Ohm∙cm;
• Conductive cores during operation withstand the permissible temperature for heating no more than 90˚С;
• Conductive conductors during operation in the short circuit mode withstand the permissible temperature for heating no more than 250 degrees Celsius;
• Conductors withstand intense ultraviolet radiation and aggressive environmental influences, including temperature + (70 ± 2) ° С, - (40 ± 2) ° С;
• Increased moisture resistance;
• The service life is approximately 40 years.

What does the abbreviation SIP mean? This abbreviation stands for - self-supporting insulated wire. It is a wire, not a cable, as some mistakenly call it.
It must be made in accordance with GOST 31946-2012 ().

SIP always consists of aluminum conductors or aluminum alloy (phase conductors), or a steel core and an aluminum sheath (neutral conductor). SIP wires are never copper. Its minimum cross section starts from 16mm2.

This is absolutely not a new invention, as some believe, and it has been known for over 50 years.
SIP was first applied in North America, and then in Western Europe back in the 1960s.

Benefits of using SIP

Compared to bare power lines, a self-supporting insulated wire simply has a lot of advantages:

• high reliability

Due to continuous insulation, phase-to-phase short circuits and subsequent wire breaks are excluded. Accordingly, there will no longer be such a sad picture on the line as numerous skids in spans.

• smaller supports can be used

For example, instead of SV-110 and SV-95 supports, take SV-85 racks. Or even use wood.

• distances from SIP to buildings and structures are reduced compared to bare VL-0.4kv

Accordingly, there are more options for using power lines in dense residential areas.

• lower power transmission losses due to low inductive reactance

For example, for a wire with a cross section of 70mm2 inductive reactance in SIP, almost 4 times less!

• using a special tool kit, it is possible to service the SIP under voltage without interrupting the supply of electricity to consumers

• trouble-free operation with proper maintenance of 30 years or more

• No extra costs for traverses, insulators, hooks, caps, clamps for traverses

• safety of work near SIP lines of third-party mechanisms

The probability that a truck crane operating in the security zone of a power line will touch the wires with an arrow and be energized is minimal.

Varieties and brands of SIP wires

To date, four main SIP systems are common:

In the cores of the SIP there is one uninsulated conductor, which is also the carrier wire. There is also a variation of this brand of SIP-1A.

The main difference between SIP-1A and SIP-1 and SIP-2 is the wire insulation material.

In SIP-1A, the insulation is cheaper and is made of thermoplastic polyethylene, and in SIP-1, SIP-2 it is made of cross-linked polyethylene with improved heat resistance qualities. Accordingly, the admissible currents loads.

For power lines up to 35kV inclusive. The wires are no longer twisted into one bundle and go separately to each phase.

Here, the mechanical load is carried by all 4 wires at the same time. Both the neutral and phase conductors are isolated, and the load on them is distributed equally.

Features of different brands of self-supporting insulated wires

SIP wire 4

SIP cores consist of twisted aluminum conductors with subsequent sealing. All conductors are of the same section and with the same insulation. Each core is covered with light-stabilized or thermoplastic polyethylene insulation.

SIP marking

Phase marking must be applied to the insulation. It is carried out either with the help of a colored longitudinal risk or strip, or with the help of digital marking.

From personal experience operation, I advise you to buy SIP with digital marking although it is less common.

Once I bought a wire where the marking was made with solid thin colored lines. After 3 years of operation, the entire SIP, which hung on the street, and this is more than 300 meters, fell into disrepair.

The SIP simply burst and cracked, exactly along the colored strip along the entire length of the line. The black insulation itself was like new. Apparently it was a low-quality product from the manufacturer. But I think that with the numbers on isolation, this would not have happened.

The problem was precisely in the low-quality dye, which had the usual properties and did not protect the wire sheath from ultraviolet exposure.

• Possible cross-sections of conductors for SIP-4 from 16 to 150 mm2.
• The maximum number of cores in the bundle - 6 pieces

All major technical specifications- sections, maximum current loads, resistances, weight of the SIP-4 wire are presented in the tables below:

Icing on SIP wires

Icing and snow sticking on SIP-4 wires is minimized. If wet snow or ice nevertheless sticks to the wire, then within a short period of time it is automatically reset. This is achieved due to the violation of the state of equilibrium from an additional load, in the form of adhering ice and snow.

Here is a short video showing ice formation on SIP-3 and its absence on SIP-4, and the wires are suspended on the same supports!

The insulation resistance of SIP-4 should be the same for all cores and be at least 0.5 mOhm.

The SIP 4 test is carried out with a 1000 volt megohmmeter. All phase conductors are tested between themselves and on the neutral conductor. High-voltage factory tests of wires are carried out in water, with a voltage of 2.5 kV to 4 kV, depending on the brand of self-supporting insulated wire.

Varieties of SIP-4

For increased loads while maintaining the same cross section, you can use the SIPS-4 wire. Its insulation can withstand high temperatures. Accordingly, the rated throughput current due to this increases. The letter "c" stands for light-stabilized cross-linked polyethylene.

On sale you can find several varieties of SIP-4 wires. The most common of them:

• the previously mentioned SIPS-4

Insulated with XLPE or more scientifically weather-resistant cross-linked polyethylene. In addition to increased current loads, it is also tested with a large high voltage than other brands of SIP.

High-voltage test for SIPS-4 is U=4kv. Other brands must withstand high voltage at least 2.5 sq. Moreover, SIPS-4 made of cross-linked polyethylene is more stable in its physical properties to pushing.

• SIPN-4 wire

The letter “n” means non-flammable. It needs to be bought for installation of SIP indoors.

• wire SIPt-4

The letter "t" is thermoplastic polyethylene. It means that in the event of a short circuit and heating to the melting temperature, the core insulation will not “leak”, but will go into a viscous-fluid state. After turning off the short circuit and cooling, the insulation should again return to its shape.

SIP wire 1

specifications and differences

SIP-1 consists of aluminum stranded current-carrying conductors of a round shape. The neutral core acts as a carrier conductor. It is made of a steel core, around which aluminum or aluminum alloy wires are arranged in compacted layers.

On top of ONLY the conductive cores, light-stabilized polyethylene insulation is applied. The zero core remains bare, not isolated.

All insulated cores are twisted around zero. SIP-1 wire can be either two-core or four-core, with a cross section of up to 240mm2. Also, wires with additional insulated conductors up to 25 mm2, designed for example for street lighting, can be woven into SIP-1.

SIP wire 2

technical characteristics and differences

In SIP-2 wires, the zero carrier core is also made of a steel core with aluminum wires on the outside. The difference between SIP-2 and SIP-1 is the presence of insulation on the zero carrier core. Phase conductors have the same insulation and are made of light-stabilized cross-linked polyethylene.

Table of technical characteristics, load currents, weight, active resistance for SIP-2:

SIP wire 3

technical characteristics and differences

SIP-3 is produced with a section from 25mm2 to 240mm2. Its insulation is made of cross-linked polyethylene. Inside the core there is a steel core, around which aluminum wires are twisted.

Sip-3, designed for suspension on overhead lines with voltage up to 20 kV, has an insulation thickness of 2.3 mm. For wires designed for installation on VL-35kv, the insulation is already larger - 3.5 mm thick.

SIP wire 5

technical characteristics and differences from SIP 4

SIP-5 is very similar to SIP-4. Even a specialist will not immediately distinguish these brands of wires. Its main difference is a different insulation of the cores. Namely, silanol-crosslinked light-stabilized polyethylene.
SIP-5 is also produced with the “ng” brand, which means non-flammable. Choose this particular SIP option if you need to bring it inside the house, directly to the switchboard or into the meter itself.

As already mentioned, self-supporting wires have a lot of advantages over conventional bare overhead power lines. Moreover, it is not only profitable in terms of reliability, but also effective from an economic point of view. Using new technologies and fittings, line routes can be designed according to completely different schemes.

Here is a comparative table of costs for installing a 0.4 kV overhead line with a length of 1 km using bare wires and SIP brands various systems. The analysis was carried out by CJSC NIC "StarInfo" (taken from here).

The table shows the cost part as a percentage for each elements of the overhead line and directly to the installation itself. And at the end summed up. Again, the difference in the cost of installation by one or another system is shown as a percentage. The cost of installing an air overhead line-0.4kv with bare wires is conditionally taken as 100%.

As can be seen from the final results, the transition from an overhead line to SIP-4 is not a laborious undertaking and is comparable to the construction of the same overhead line with bare wires. But in further operation, all the advantages that a self-supporting insulated wire has will only save your money and resources.

Self-supporting insulated wire is a new generation of cable and wire products. It is used in networks of 0.4, 1 kV, 6-35 kV:

• highway construction;
• linear branches;
• construction of inputs to residential and administrative buildings.

General view of the SIP cable

Structure

SIP - twisted wire made of aluminum conductors, covered with light-stabilized high-strength polyethylene, not sensitive to ultraviolet rays. The shell is painted black. In conjunction with zero is a steel bearing element, aluminum wires are located around.

The structure of the SIP cable: 1 - conductive element; 2 - steel core; 3 - polyethylene sheath

• Phase cable. Made of aluminum (aluminum and steel core for SIP-3). Round shape. The number of aluminum wires is standardized by the specifications for the manufacture of each grade. Electrical resistance complies with current GOSTs.
• Bearing vein. It has a rounded shape, made of aluminum alloy. Absent in SIP-3, SIP-4 and SIP-5.
• Device. Phase wires are twisted around the neutral core. The direction of movement is clockwise.
• Shell. Made of light stabilized cross-linked XLPE (SIP 2, SIP-3, SIP-5) or thermoplastic polyethylene low pressure LDPE (SIP-1, SIP-4) .
  

• SIPn - the use of materials for insulation that do not support combustion;
• SIPg - the use of water-repellent materials;
• SIPng - "cross-linked polyethylene" with the introduction of water-retaining materials that do not support combustion.

SIP is used in power lines with radial circuits. The technical solution is a cheaper and high-quality alternative to bare-wire overhead power lines and cable lines laid on a cable.

SIP-X decoding:

• C - self-supporting.
• And isolated.
• P - wire.
• X - 1(1A), 2 (2A), 3, 4, 5

Suspension elements

When erecting VLI, fittings from various manufacturers are used.

For a four-wire system use:

• Tension clamps.
• Support clamps. Used for intermediate mounting on supports. Clamp bodies are made of corrosion-resistant materials.
• Several types for connecting isolated aluminum wires with aluminum, copper and SIP.
• Flat clamps. Necessary for interconnecting bare and insulated conductors.
• Other fittings: cable lugs, busbar clamps, components for the lighting network (surge arresters, fuses), fittings for laying SIP on building facades (remote clamps, wall hooks, multi-brackets), hooks and brackets for mounting on supports, hand tools.

The choice of fittings depends on specific typical recommendations.

VLI is built on wooden and reinforced concrete supports. Benefits given wooden materials, because their service life is more than 100 years, when such lines are dismantled, the supports are suitable for subsequent use. In domestic networks, reinforced concrete racks are widely used due to their low cost relative to wooden ones.

Deciphering the types of SIP

According to GOST R 52373-2005, there are several types:

• SIP-1 - cable with an uninsulated bearing element;
• SIP-2 - bearing element in an insulated shell;
• SIP-3 - designed for 6-35 kV networks, protected insulation;
• SIP-4 - cables without a bearing element;
• SIP-5 - each core contains a steel element.

Advantages of SIP

• reducing the cost of construction;
• stable operation of overhead power lines, no wire lashing and breaks;
• maintenance of VLI under voltage. New consumers can be connected without disconnecting the feeder;
• full insulation of cores;
• reduction of the security zone;
• light weight of the wire;
• joint suspension of 4 chains on a support;
• downsizing between high voltage lines and SIP;
• ease of maintenance;
• reduction of electricity theft;
• the possibility of using lightweight reinforcement;
• simplification of the construction of cable inserts;
• reduction of voltage losses at the end point of the line;
• frost resistance;
• the possibility of using anti-snow and anti-icing devices on the lines;
• the possibility of laying wires along supports, fences and facades of buildings (in accordance with the norms of the PUE);
• reduction of construction time;
• lower operating costs. With quality design solutions, maintenance costs can be reduced by up to 80%;
• stable operation in any weather - these brands can be used in areas with a cold climate without the use of additional protective equipment;
• increase in the service life of the line (low weight of self-supporting insulated wire and fittings increase the service life of supports);
• reduction in the number of accidents from electric shock.

• Execution of SIP 1, 2, 3 according to GOST 15150.
• The polyethylene sheath is UV resistant.
• The minimum bending radius is 10d.
• The service life of the overhead transmission line is at least 40 years.
• Warranty period - 3 years.
• The cable is labeled for each core.

See the table below for details.

Brand SIP-1, SIP-1A

Decryption:

• SIP-1. Phase wires are insulated from light-stabilized PE, the carrier core is bare;
• SIP-1A. All elements are sheathed in light stabilized PE.

The design of the cable brand SIP-1A

1. Phase cable.
2. Bearing vein.
3. Steel core.
4. Shell.

Peculiarities:

• the conductive core is made of stranded aluminum, cross section 16-120 mm 2 ;
• zero cable made of aluminum alloy with a supporting element made of steel, section 25-95 mm 2;
• sheath - "cross-linked polyethylene";
• operating voltage 0.6/1 kV;
• frequency 50 Hz;
• execution type I and II.

Area of ​​use:

• construction of highways and linear branches;
• building entry device.

brand

Decryption:

• SIP-2. Multicore insulated cables. The zero core contains a steel element, it is a bare cable.
• SIP-2A. Cables with insulated conductors.

Design areas:

SIP-2, SIP-2A is designed to carry out inputs into buildings, construction of VLI on the coasts of the seas, in regions with a cold climate, salt lakes, in places with a polluted atmosphere.

Cable brand SIP-2A

Peculiarities:

• operating voltage - 0.6; 1 kV;
• network frequency - 50 Hz;
• atmospheric version - type II and III;
• delivery - in drums.

Brand SIP-3

Single-core steel-aluminum insulated cable with protective insulation made of "cross-linked polyethylene".

Design:

• cable - multi-wire power cable, made of compacted aluminum alloy, contains a steel core. Cross section 35-240 mm 2 .
• shell - "cross-linked polyethylene" type

The structure of the SIP-3 cable: 1 - bearing element; 2 - aluminum wires; 3 - shell

Peculiarities:

• operating voltage 10, 15, 20, 35 kV;
• the declared service life is at least 40 years;
• execution according to GOST 15150 II and III.

Purpose:

• construction of main sections and power transmission taps in 10-35 kV networks;
• connection of equipment to overhead transmission lines (disconnectors, reclosers, metering points, etc.);
• laying routes in areas with a difficult environmental situation;
• installation of power lines near the seas, saline sands, salt lakes.

Brand SIP-4

SIP-4 - power cable without a separate carrier core. Sheath made of cross-linked polyethylene.

General view of SIP-4

Specifications:

• operating voltage 0.6; 1 kV;
• frequency 50 Hz;
• execution in accordance with GOST II and III.

Design features:

• phase conductors - aluminum from thin wire, compacted; section 16-120 mm 2;
• sheath made of light-stabilized thermoplastic polyethylene.

Application area:

• installation of branches to buildings;
• construction of highways and linear branches;
• input to metering devices;
• construction of power lines in regions with severe winters.

Brand SIP-5

SIP-5 is a multi-core power cable, without a supporting element. The current-carrying elements are made of aluminum, the sheath material is cross-linked polyethylene.

General view of the SIP-5 cable

Purpose:

• highways and linear branches to VLI;
• branch device.

SIP testing

1. Polyethylene breakdown test (for protected wires): for a voltage of 20 kV it is at least 24 kV, for networks of 35 kV - at least 40 kV under power frequency conditions.
2. AC insulation test:
   • for a voltage of 0.4 kV - is 4 kV;
   • for 20 kV, the value is 6 kV;
   • for 35 kV the value is 10 kV.

Fixing the four-wire VLI-0.4 on the SV rack

1. Steel tape.
2. Clip for bandage tape.
3. Hook.
4. Plain clamp.
5. Collar.
6. Hook.
7. Tension clamp.

Dismantling the cable. Video

How the SIP cable is dismantled can be found in the video below.

Self-supporting insulated wires are the best solution for the construction of modern power lines. High performance, low construction costs and minimal personnel costs for line maintenance have made SIP one of the leaders in cable and wire products. The introduction of insulated new cable brands has reduced the number of accidents and emergency shutdowns household consumers.

Mounted open. What does this mean? The power line consisted of four open wires: the 1st, 2nd and 3rd phases, plus the 4th "zero". The wires were stretched between insulators mounted on support poles at such a distance as to prevent

The layout wasn't perfect. First, in the conditions strong wind the wires sometimes overlapped, throwing out sheaves of sparks. Such "fireworks" could easily de-energize small settlements. Secondly, humid air is not the best insulator, so the power loss was significant.

Later, for laying overhead power lines, special self-supporting cables began to be used, such as SIP 4 4x16, the technical characteristics of which make it possible to avoid both electricity losses and prevent minor accidents.

Let's decipher the marking

What do the letters and numbers mean in the cable designation? Like any wire, SIP 4 4x16 technical specifications can be read by marking.

self-supporting

Not every wire can be used for laying overhead lines. When tensioned, the insulation material and the metal from which the conductive wires are made experience significant loads. The strength of the cable must be such that it does not break under its own weight, tensile force and third-party factors.

Insulated wire

The number "4", immediately following the SIP abbreviation, indicates the type of wire construction (there are five types of SIP products in total).

The cable has four separate cores insulated from each other with a cross section of 16 mm 2 each.

Device

How the SIP 4 4x16 wire is arranged. Specifications of any power cable depend on the design, location of the main elements and the material from which they are made. Each SIP core consists of seven separate wires, with six outer ones wrapped around one central one. The central element is made of a special aluminum alloy that provides high tear resistance, the outer ones are made of aluminum.

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

Specifications

For the SIP 4 4x16 product, the technical characteristics are determined by its purpose: to transmit a current of sufficiently high power, to allow the possibility of mounting a power transmission line over the air without additional supporting devices, and to withstand any atmospheric influences. The latter problem is solved by using special heat-stabilized polyvinyl chloride in the manufacture of the wire insulation, which is resistant both to temperature extremes and to the effects of ultraviolet solar radiation.

The technical characteristics declared by the manufacturer for SIP 4 4x16, the power of the transmitted current look like this:

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

Installation at air temperature from − 21 °С and above;

Temperature increase during operation up to + 95 °С;

The maximum allowed voltage is up to 1 kV;

Estimated service life of the wire not exposed to short circuit - at least 45 years;

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

Application area

Laying overhead lines for a small street and a branch system from the reference directly to the house are the main areas of application for SIP 4 4x16. The technical characteristics of this cable make it possible to use it in any climatic zone of Russia, including for the power supply of coastal structures, when the aggressive effect of sea salt water damages even power lines.

Their purpose and application.

Today's article is about SIP systems, brands and SIP characteristics wires.

All SIP wires are divided into 3 systems:

• SIP with "bare" (non-insulated) carrier neutral
• SIP with isolated carrier neutral
• self-supporting SIP system

Let's consider each type in more detail.

The main characteristics of the SIP system with a "bare" carrier neutral

The first system that we will consider is called the SIP system with a "bare" (non-insulated) carrier neutral. It is also called the "Finnish" system.

It consists of:

1 to 4 insulated phase conductors (material aluminium)

1 carrier uninsulated neutral conductor (material - aluminum or stele-aluminum alloy)

Phase insulated conductors are twisted throughout their entire length around a neutral bare conductor.

The insulation of the phase conductors is made of thermoplastic polyethylene, which can withstand a temperature of about 60-70°C for a long time. In such insulation is able to withstand temperatures up to 125 ° C.

SIP-1 (Russian-made)

AMKA (European standard)

Here is an example of a SIP-1 brand wire, consisting of 3 phase conductors and one neutral (PEN).

By the way, most of the SIP wires produced in Russia have the corresponding PUE () and the new GOST 50462-2009.

For example:

for the neutral conductor - blue

Insulated phase conductors have the same mechanical strength and, but the neutral non-insulated conductor has increased mechanical strength and is necessary for hanging SIP, i.e. when laying and tensioning the line, it is the neutral conductor that bears the entire load.

The overhead line made using the SIP-1 wire is very durable and reliable. It is able to withstand most mechanical external factors and impacts.

When designing a line, it is imperative to ground the neutral carrier (neutral) conductor on each support in order to exclude the occurrence of a life-threatening potential on it at.

Main characteristics of the SIP system with isolated carrier neutral

A system with an isolated carrier neutral is called a "French" system. It differs from the previous system only in that its carrying neutral conductor is insulated, and not "naked".

The CIP system with isolated carrier neutral consists of:

1 to 4 insulated conductors (material aluminum)

1 carrier insulated conductor (material - aluminum or stele-aluminum alloy)

Phase insulated conductors are twisted all the way around the neutral insulated conductor.

The insulation of the phase conductors and the carrier neutral conductor is made of silanol-crosslinked (light-stabilized) polyethylene, which can withstand temperatures of about 80-90°C for a long time. This insulation is able to withstand temperatures up to 240°C.

This system includes the following brands:

SIP-2A (Russian-made)

AMKA-T (European standard)

Here is an example of a wire of the SIP-2A brand, consisting of 3 phase conductors and one neutral (PEN).

The use of wires of the SIP-2A brand is advisable only for coastal (marine) areas, because. it is there that the need arises to protect the "bare" carrier neutral conductor from corrosion.

But this system has a significant drawback. The fact is that the entire mechanical load of the line is carried by an insulated neutral conductor, namely its insulation layer. Therefore, when designing a line using SIP-2A, it is necessary to reduce anchor spans in order to avoid breaking the wire insulation layer.

Note: Russian manufacturers of cable products, in addition to the main systems of SIP wires listed above, have developed additional systems:

• SIP-2

SIP-2 brand wire is an analogue of SIP-1. They differ only in the material of the insulation of the phase conductors. As I said above, SIP-1 uses thermoplastic polyethylene as insulation, while SIP-2 has insulation made of silanol-crosslinked (light-stabilized) polyethylene.

Wire brand SIP-1A is an analogue of SIP-2A. They differ only in the material of insulation of the phase and neutral conductors. As I said above, for SIP-2A, silanol-crosslinked (light-stabilized) polyethylene is used as insulation, and for SIP-1A, the insulation is made of thermoplastic polyethylene.

The main characteristics of the self-supporting SIP system

The self-supporting SIP system in Russia is called "Swedish" and it consists of:

1 to 4 insulated conductors (material - aluminum)

The material of all conductors is made of aluminum, therefore, the cost of the wires of this SIP system is somewhat less than the previous ones, because. aluminum in pure form lower cost than its aluminum alloy.

Such a system includes the following brands of Russian manufacturers:

SIP-3 (up to 20 kV)

Here is an example of two wires of the SIP-4 brand, consisting of 4 and 2 conductors.

All insulated conductors of this system are twisted together throughout the entire length, and have the same mechanical strength and conductor cross section. When laying and tensioning the line, the load is borne by all conductors, i.e. fastening is carried out immediately for all conductors. That's why this system in terms of mechanical loads, it has an advantage over previous systems.

Note: wires of the SIP-4 and SIP-5 brands differ only in the insulation material. For SIP-4, thermoplastic polyethylene is used as insulation, and for SIP-5, the insulation is made of silanol-crosslinked (light-stabilized) polyethylene.

SIP-3 brand wire is used for transmission with voltage up to 20 (kV), i.e. is high voltage. The conductor is made of aluminum with a steel core in the center. The insulation of SIP-3 is made of silanol-crosslinked (light stabilized) polyethylene.

Here is an example of a SIP-3 wire:

SIP systems. conclusions

At the end of the article, we will draw a reasonable conclusion from the whole variety SIP brands and their characteristics. To begin with, we systematize all the information from this article into tables.

I recommend: SIP-2 brand wire should be used for main power lines and linear branches from overhead lines. And the wire of the SIP-4 or SIP-5 brand is for branches for inputting or laying wires along the facade and walls of buildings.

P.S. In the following articles, I will tell you about SIP fittings and how to enter the house using SIP wires. In order not to miss new releases, subscribe (the subscription form is at the end of the article). Thank you for your attention.