| Material |
Thermal Resistivity (ρT)
Km/W
IEC 60287
|
| Insulating Materials* |
| Paper insulation in solid type cables 6.0 |
6.0 |
| Paper insulation in oil-filled cables 5.0 |
5.0 |
| Paper insulation in cables with external gas pressure |
5.5 |
| Paper insulation in cables with internal gas pressure |
| A) Pre-impregnated 5.5 |
5.5 |
| B) Mass-impregnated |
6.0 |
| PE 3.5 |
3.5 |
| XLPE 3.5 |
3.5 |
| PPL 5.5 |
5.5 |
| Polyvinyl chloride |
| Up to and including 3kV cables |
5.0 |
| Greater than 3kV cables |
6.0 |
| EPR |
| Up to and including 3kV cables |
3.5 |
| Greater than 3kV cables |
5.0 |
| Butyl rubber |
5.0 |
| Rubber |
5.0 |
| Protective Coverings |
| Compounded jute and fibrous materials |
6.0 |
| Rubber sandwich protection |
6.0 |
| Polychoroprene |
|
| PVC |
| Up to and including 35kV cables |
5.0 |
| Greater than 35kV cables |
6.0 |
| PVC/Bitumen on corrugated aluminum sheaths |
6.0 |
| PE 3.5 |
3.5 |
| Materials for Duct Installations |
| Concrete |
1.0 |
| Fibre |
4.8 |
| Earthenware |
1.2 |
| PVC |
6.0 |
| PE |
3.5 |
