IEC standard LV Power Cable
Construction
(1) Conductors
The conductors are either of Class 1 or Class 2 of plain or metal-coated annealed copper or of plain aluminium or aluminium alloy,or of Class 5 of plain or metal-coated copper in accordance with IEC 60228.
(2) Insulation
XLPE or Polyvinyl chloride(PVC)
(3) Sheath
Polyvinyl chloride(PVC) or polyethylene or Halogen free
(4)The constructions of inner coverings、fillers and metal layers have multiple choices depending on the customer needs.
Insulating compounds
| Insulating compound | Abbreviated designation | |
| b) | Thermoplastic | |
| Polyvinyl chloride intended for cables with rated voltages Uo/Us 1,8/3 kV | PVC/A a | |
| Cross-linked: | ||
| Ethylene propylene rubber or similar(EPM or EPDM) | EPR | |
| High modulus or hard grade ethylene propylene rubber | HEPR | |
| Cross-linked polyethylene | XLPE | |
| ● Insulating compound based on polyvinyl chloride intended for cables with rated AC voltages Ua/U =3,6/6 kV designated PVC/B in IEC 60502-2. | ||
Maximum conductor temperatures for different types of insulating compound
| Insulating compound | Maximum conductor temperature °C | ||
| Normal operation | Short-circuit (5s maximum duration) | ||
| Polyvinyl chloride | /A | ||
| Conductor cross-section ≤300 mm2 | 70 | 160 | |
| Conductor cross-section ＞300 mm2 | 70 | 140 | |
| Cross-linked polyethylene | 90 | 250 | |
| Ethylene propylene rubber | EPRand | 90 | 250 |
Nominal thickness of PVCIA insulation
|
Nominal cross-sectional area of conductor mm2 |
Nominal thickness of insulation at rated voltage Uol U(Um) |
|
|
0.6/1(1.2)kV mm |
1.8/3(3.6)kV mm |
|
| 1.5 and 2.5 | 0.8 | |
| 4 and 6 | 1.0 | |
| 10 and 16 | 1.0 | 2.2 |
| 25 and 35 | 1.2 | 2.2 |
| 50 and 70 | 1.4 | 2.2 |
| 95 and 120 | 1.6 | 2.2 |
| 150 | 1.8 | 2.2 |
| 185 | 2.0 | 2.2 |
| 240 | 2.2 | 2.2 |
| 300 | 2.4 | 2.4 |
| 400 | 2.6 | 2.6 |
| 500 to 800 | 2.8 | 2.8 |
| 1000 | 3.0 | 3.0 |
Nominal thickness of cross-linked polyethy lene(XLPE)insulation
|
Nominal cross-sectional area of conductor mm2 |
Nominal thickness of insulation at rated voltage Uol U(Um) |
|
|
0.6/1(1.2)kV mm |
1.8/3(3.6)kV mm |
|
| 1.5 and 2.5 | 0.7 | |
| 4 and 6 | 0.7 | |
| 10 and 16 | 0.7 | 2.0 |
| 25 and 35 | 0.9 | 2.0 |
| 50 | 1.0 | 2.0 |
| 70 and 95 | 1.1 | 2.0 |
| 120 | 1.2 | 2.0 |
| 150 | 1.4 | 2.0 |
| 185 | 1.6 | 2.0 |
| 240 | 1.7 | 2.0 |
| 300 | 1.8 | 2.0 |
| 400 | 2.0 | 2.0 |
| 500 | 2.2 | 2.2 |
| 630 | 2.4 | 2.4 |
| 800 | 2.6 | 2.6 |
| 1000 | 2.8 | 2.8 |
Sheathing compounds and maximum conductor temperatures for different types of sheathing compound
| Sheathing compounds | Abbreviated designation |
Maximum conductor temperature in normal operation °C |
|
| a） | Thermoplastic: | ||
| Polyvinyl chloride(PVC) | ST1 | 80 | |
| ST2 | 90 | ||
| Polyethylene | ST3 | 80 | |
| ST7 | 90 | ||
| Halogen free | STs | 90 | |
| b） | Elastomeric: | ||
| Polychloroprene chlorosulfonated polyethylene or similar polymers | SE1 | 85 | |
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