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. Central filling from the harness:
-for cables with the index «нг(А)-LS» - low smoke flame retardant PVC;
-for cables with the index «нг(А)-HF» -Halogen-free compound;
-for all other cables - PVC or polypropylene fibers
-for cables with the index «г», «гж», «2гж» - water blocking harnesses
2. Three round stranded compacted multicore conductors
- Material
Aluminum (AI), Copper (Cu)
Cross-sectional area
Aluminum 25-630 mm2
Copper 25-630 mm2
Cables with the index «гж», и «2гж» should have water- blocking element in each twist
3. Conductor screen:
-extruded conductive peroxide-crosslinked polyethylene composition.
4. Insulation:
-peroxide-crosslinked polyethylene (Пв)
5. Insulation screen:
-extruded electrically conductive peroxide-crosslinked polyethylene composition.
6. 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.
7. 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
7*. Metallic screen - aluminum wire with aluminum tape
8. Filling the outer gaps:
-for cables with the index «нг(А)-LS» - low smoke flameretardant PVC;
-for cables with the index «нг(А)-HF» -Halogen-free compound;
-for all other cables - PVC
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. Armor
-Galvanized steel tape (Б) Galvanized steel wires (К) or aluminum or aluminum alloy wires (Ка).
11. 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);