Medium voltage cables 6-35 kV. Brand
They are intended for installation in soils with high humidity and damp, frequently flooded structures, as well as, by agreement with the manufacturer, in non-navigable water bodies and in navigable ones - subject to measures that exclude mechanical damage to the cable.
Standard
IEC 60502-2, GOST 34834-2022, HD-620
Main design elements
1. One round multi-wire compacted conductive core:
- Material
Aluminum (AI), Copper (Cu)
Cross-sectional area:
Aluminum 25-1000 mm2
Copper 25-1000 mm2
2. Conductor screen:
- extruded conductive peroxide-crosslinked polyethylene composition.
3. Insulation:
- peroxide-crosslinked polyethylene (PV)
4. Insulation screen:
- extruded electrically conductive peroxide-crosslinked polyethylene composition.
5. Separating layer:
-For types without index "г" - wrapping with tapes made of conductive paper or conductive cloth;
-For types with the index "г", "гж", "2гж" and "2г" - covered with conductive water-blocking tape
6. Metallic screen - copper wire with copper tape
- cross-section of at least 16 mm2, for cables with cross section of 25-120 mm2
- cross-section of at least 25 mm2, for cables with cross section of 150-300 mm2
- cross-section of at least 35 mm2, for cables with cross section above 400 mm2
6*. Metallic screen - aluminum wire with aluminum tape
* Note: The screen cross-section is selected depending on the short-circuit currents, which must be calculated according to the conditions of laying the cable line. It is possible to manufacture a cable with an enlarged screen section
7. The separation layer on top of the metal screen:
-for cables with the index "нг(A)-LS", in unpressurized, glass tape -cables with the index «нг(А)-HF»- glass tape.glass tape.
-for cables with the index «г», «гж» in «нг(А)-HF» type - water blocking tape at least one glass tape and water-blocking tape
-for cables with the index "г", "гж", except for cables "нг(A)-HF" - water-blocking tape;
-for cables with the index "2г" and "2гж" - conductive water-blocking tape and an alumopolymer composition;
8. The separation layer:
- for cables with the index "нг(A)-LS" - glass tapes.
9. Inner covering under armor
-for cables with the index «нг» - fire resistant PVC;
-for cables with the index «нг(А)-LS» - Low smoke fire resistant PVC;
-for cables with the index «нг(А)-HF» -Halogen-free compound;
-for cables with the index «П» - polyethylene;
-for cables with the index «В» - PVC
-for cables with the index «Пнг» - self-extinguishing composition of polyethylene.
10. Outer sheath:
-Polyethylene (П);
-PVC (В);
-Flame retardant PVC (В нг(А))
-Low smoke Flame retardant PVC (В нг(А)-LS)
-Halogen-free compound (П нг(А)-HF);