Armour material shall be Galvanized steel for three core cables and Aluminium for single core cables. Armour of other material as per IEC 60502-2 can be provided upon request.
Outer Sheath
Outer sheath shall be extruded PVC type ST2 as per IEC 60502-2, Type 9 as per BS 7655. Special type of sheathing material such as fire retardant PVC or anti-termite and anti-rodent PVC, ultraviolet
PVC, Oil resistant PVC, etc. are available on request also other special sheathing materials such as LLDPE, MDPE, HDPE, LSF, CPE etc are available.
Phase Identification
For 3 core cables, Red, Yellow and Blue colored strips shall be applied under the metallic screen throughout the length of the cable for phase identification.
For single core cables no phase identification shall be provided.
Inner Covering / Separation Sheath
Inner covering may be extruded or lapped. When the underlying metallic layer and the armour are of different materials, they shall be separated by an extruded sheath of PVC or Polyethylene or LSF
as applicable.
Metallic Armour
Armour shall be as per IEC 60502-2 of the following types:
Conductors
Conductors shall be Stranded Class 2 of plain annealed copper or aluminium and in accordance with IEC 60228 and BS 6360.
Conductor Screen
Conductor screen shall be non-metallic and shall consist of an extruded semi-conductive compound, which may be applied on top of a semi-conductive tape at the manufacturer's discretion. The
extruded semi-conducting compound shall be firmly bonded to the insulation.
XLPE Insulation
Insulation shall be XLPE (cross-linked polyethylene). Thickness and test requirements shall comply with IEC 60502-2 & IEC 60811 series.
Insulation Screen
The insulation screen shall consist of a non-metallic semi-conducting layer in combination with a metallic layer.
Conductors shall be Stranded Class 2 of plain annealed copper or aluminium and in accordance with IEC 60228 an |
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