Symbol Used in Harmonized System
  Color of cores and outer sheaths
  Voltage Drop
  Voltages
  Convertions Factors for Current Carrying Cap...
  Construction Components and Rated ...
  Capacity of Cable Drums
 
 

Construction Components and Rated ...

 

Insulating sheath : Used for insulation of conductor core.

Separating sheath :
Insulating material between metallic components of cable construction.

Outer sheath :
Outer sheath protects the cable from mechanical stress and corrosion.

Armour : Strong protective flat or round steel wires or tapes surrounding cable against mechanical damage.

Middle sheath:
Insulating material to fill voids in core bundles and give desired overall shape to multi-core cables.

Semi-conductive layers : Semi conductive material laying between conductor and insulating sheath and over insulating sheath.

Compacted conductor :
A multi-wired conductor stranded and compacted in order to reduce the gap among the wires and the geometric dimensions of size.

Concentric conductor :
Conductor placed between outer sheath and filling used as earthing or protective neutral, consists of round wires and flat tape helically.

Sheath :
Outer covering that surrounds cores is a protective layer against mechanical or chemical damage.

Rated Voltages

 

Rated Voltages

Systems

In three - phased systems

In single-phased system
Both phase conductor insulated In single-phased conductor earthed
Rated Voltage Permissible max.
Operating voltages
Rated Voltage Permissible max.
Operating voltages
Rated Voltage Permissible max.
Operating voltages
Un Ub max. Un ≤ 2 U Ub max. Un ≤ 2 U Ub max.
kV kV kV kV kV kV
0,6 / 1 1 1,6 1,2 1,4 0,6 0,7
1,8 / 3 3

3,6

3,6

     
3,6 / 6 6 7,2 7,0 8,3 3,5 4,1
6 / 10 10 12 12 13,5 5,8 6,7
8,7 / 15 15 17,4 17,4 20,2 8,7 10,1
12 / 20 20 24 24 28,0 12,0 14,0
20,3 / 35 35 40,6 40,6 47,3 20,3 23,7
26 / 45 45 52        
36 / 60 60 72        

38 / 66

66 76        
64 / 110 110 123        
76 / 132 132 145        
87 / 150 150 140        
89 / 154 154 175