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SIP (self-supporting insulated wire) is a type of wire designed for the transmission and distribution of electrical energy in overhead power and lighting networks with a nominal voltage of up to 0.6/1 kV inclusive. It is also used for protected wires of overhead power lines with a nominal voltage of 20 kV (for networks with voltages of 10, 15, and 20 kV) and 35 kV (for networks with a voltage of 35 kV) with a nominal frequency of 50 Hz.
Advantages of SIP wires:
1. High reliability and safety:
– XLPE does not form electrical or chemical bonds with contacting substances, unlike, for example, PVC.
– Wet snow does not stick to XLPE insulation, it is not affected by ice buildup – no “wire overgrowth” in winter, no breaks.
– Reduces the statistics of electric shock incidents during installation, repair, and operation of the line due to the presence of XLPE insulation (unlike A and AC wires).
– Possibility of installation in urban environments due to the presence of insulation.
2. Reduced installation costs:
– Overhead lines with SIP do not require wide clearings in forest areas.
– Shorter poles are used, eliminating the need for insulators and expensive crossarms.
– Possibility of laying SIP along building facades, as well as joint suspension with low and high voltage wires, and communication lines.
3. Reduction of operating and maintenance costs by up to 80%:
– No costs for periodic clearing of clearings, unlike A and AC wires.
– Reduction of energy losses due to more than threefold decrease in reactive resistance.
– Lower probability of unauthorized connections.
– New subscribers can be connected without disconnecting others.
– Higher reliability – reducing repair and maintenance expenses.
By voltage level:
– Low voltage 0.6-1.0 kV – SIP-1, SIP-1A, SIP-2, SIP-2A, SIP-4, SIP-5
– Medium voltage 10-35 kV – SIP-3
By number of conductors:
– Multicore (up to 6 cores) – SIP-1, SIP-1A, SIP-2, SIP-2A, SIP-4, SIP-5
– Single-core – SIP-3
By construction:
– With a supporting conductor – SIP-1, SIP-1A, SIP-2, SIP-2A
– Without a supporting conductor – SIP-3, SIP-4, SIP-5
SIP-1 – self-supporting insulated wire with aluminum conductive cores, insulated with light-stabilized thermoplastic polyethylene, with a neutral supporting uninsulated conductor made of compacted aluminum wire reinforced with steel wire or aluminum alloy.
SIP-1A – similar to SIP-1 but with a neutral supporting conductor insulated with light-stabilized thermoplastic polyethylene. SIP-1 and SIP-1A wires are used for overhead power lines and branches to residential buildings and outbuildings in areas with moderate and cold climates, in air atmospheres of types II and III according to GOST 15150.
SIP-2 – self-supporting insulated wire with aluminum conductive cores, insulated with light-stabilized cross-linked polyethylene, with a neutral supporting uninsulated conductor made of compacted aluminum wire reinforced with steel wire or aluminum alloy.
SIP-2A – similar to SIP-2 but with a neutral supporting conductor insulated with light-stabilized cross-linked polyethylene. SIP-2 and SIP-2A wires are used for overhead power lines and branches to residential buildings and outbuildings in areas with moderate and cold climates, in air atmospheres of types II and III according to GOST 15150.
SIP-3 – self-supporting protected wire with a conductive core made of aluminum alloy, with protective insulation made of light-stabilized cross-linked polyethylene. It is used for overhead power lines with a nominal voltage of 10-35 kV in air atmospheres of types II and III according to GOST 15150, including coastal areas, salt lakes, industrial zones, and regions with saline sands.
SIP-4 – self-supporting insulated wire without a supporting element, with aluminum conductive cores, insulated with light-stabilized thermoplastic polyethylene. It is used for overhead power lines and branches to residential buildings and outbuildings in areas with moderate and cold climates, in air atmospheres of types II and III according to GOST 15150.
SIP-5 – self-supporting insulated wire without a supporting element, with aluminum conductive cores, insulated with light-stabilized cross-linked polyethylene. It is used for overhead power lines and branches to residential buildings and outbuildings in areas with moderate and cold climates, in air atmospheres of types II and III according to GOST 15150.
Wires of the SIP-1, SIP-1A, SIP-2, and SIP-2A brands with a neutral supporting conductor and a core cross-section of 50 mm² or more can be manufactured with 1, 2, or 3 auxiliary conductors. The nominal cross-section of auxiliary conductors for outdoor lighting circuits is 16 mm², 25 mm², or 35 mm², and for control circuits – 1.5 mm², 2.5 mm², or 4 mm².
The calculated weight and outer diameter of the wires in the table are provided for reference purposes.
| Brand | Number and nominal cross-section of conductive and neutral supporting conductors, pcs × mm² | Calculated wire diameter, mm | Calculated weight per 1 km of wire, kg |
| SIP-1, SIP-2 – 0,6/1 kV | 1×16+1×25 3×16+1×25 3×25+1×35 3×35+1×50 3×50+1×50 3×50+1×70 3×70+1×70 3×70+1×95 3×95+1×70 3×95+1×95 3×120+1×95 3×150+1×95 3×185+1×95 3×240+1×95 4×16+1×25 4×25+1×35 | 13.60 18 21 25 28 29 32 32 38 38 38 45 48 53 26 173 | 309 455 614 777 857 1052 1158 1313 1420 1399 1940 2301 2803 373 |
| SIP-1А, SIP-2А – 0,6/1 kV | 1×16+1×25 3×16+1×25 3×25+1×35 3×35+1×50 3×50+1×50 3×50+1×70 3×70+1×70 3×70+1×95 3×95+1×70 3×95+1×95 3×120+1×95 3×150+1×95 3×185+1×95 3×240+1×95 4×16+1×25 4×25+1×35 | 16 19 23 27 28 30 33 35 36 38 40 42 45 48 22 208 | 344 395 666 840 929 1128 1255 1381 1507 1781 2067 2385 2887 413 597 |
| SIP-3 20kV | 1×35 1×50 1×70 1×95 1×120 1×150 1×185 1×240 | 12 13 15 16 18 19 21 24 | 165 215 282 364 445 540 722 950 |
| SIP-3 35kV | 1×35 1×50 1×70 1×95 1×120 1×150 1×185 1×240 | 14 16 17 19 20 22 24 26 | 209 263 334 421 518 618 808 1045 |
| SIP-5 – 0,6/1 kV | 3×35 3×50 3×70 3×95 3×120 4×16 4×25 4×35 4×50 4×70 4×95 4×120 | 22 25 29 33 36 17.8 23 24 29 32 39 41 | 396 540 735 1031 1219 260 404 528 718 980 1375 1625 |
| SIP-4 – 0,6/1 kV | 2×16 2×25 2×35 2×50 2×70 2×95 2×120 3×16 3×25 3×35 3×50 3×70 3×95 3×120 4×16 4×25 4×35 4×50 4×70 4×95 4×120 2×16 2×25 2×35 2×50 2×70 2×95 2×120 3×16 3×25 | 14.8 19 20 23 27 31 34 15.9 20 22 25 29 33 36 17.8 23 24 29 32 39 41 14.8 19 20 23 27 31 34 15.9 20 | 130 202 264 363 490 637 813 195 303 396 540 735 1031 1219 260 404 528 718 980 1375 1625 130 202 264 363 490 637 813 195 303 |
Wires with a nominal voltage of 0.6/1 kV are manufactured as multicore, while wires with a nominal voltage of 20 and 35 kV are single-core. The main and auxiliary conductive cores for lighting circuits are stranded from round aluminum wires, have a round shape, and are compacted. The auxiliary cores for control circuits are single-wire copper and comply with GOST 22483.
The neutral supporting conductor of the wires is stranded from compacted aluminum wire reinforced with steel wire or made of aluminum alloy.
The marking of wire cores complies with the requirements of GOST 18690 and features distinctive identification in the form of color stripes.
The electrical resistance of the zero load-bearing conductor of wires of brands SIP-1, SIP-1A, SIP-2, SIP-2A, and the main conductor of the SIP-3 wire made of aluminum alloy, recalculated per 1 km of length and at a temperature of 20°C.
The electrical resistance of the main and auxiliary conductors to direct current of wires of brands SIP-1, SIP-1A, SIP-2, SIP-2A, SIP-4, and SIP-5, recalculated per 1 km of length and at a temperature of 20°C, complies with GOST 22483-2012.
| Brand | Nominal cross-section of the conductive core, mm² | Electrical resistance of the core to direct current per 1 km length, Ohm, not more than |
| SIP-1, SIP-1A, SIP-2, SIP-2A, SIP-3 | 25 | 1.380 |
| 35 | 0.986 | |
| 50 | 0.720 | |
| 70 | 0.493 | |
| 95 | 0.363 | |
| SIP-3 | 120 | 0.288 |
| 150 | 0.236 | |
| 185 | 0.188 | |
| 240 | 0.145 |
– aluminum rod according to GOST 13843;
– galvanized steel wire according to GOST 9850;
– copper rod according to ST RK GOST R 53803;
– polyethylene according to GOST 16336-77;
– aluminum alloy rod of grade 6101-T4;
– silane-crosslinkable polyethylene composition with a melt flow index of 1 g/10 min within the norm of 0.8 – 1.1;
– crosslinking catalyst with a technical carbon (soot) content of ≥32.4%.
The service life of the wires is at least 40 years.
The warranty period for wire operation is 3 years.
The warranty period is calculated from the date the wire is put into operation, but no later than 6 months from the date of manufacture.
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