Application:
XLPE INSULATED LAID UP SWA AND PVC SHEATHED CABLE TO IEC60502.2.is used indoor or outdoor, in tunnel, cable furrow or pipe, to be laid underground, be applicable to the well, water inside and fall in the bad soil.
Standards:IEC 60502-2
CONDUCTOR:
The conductor consists of annealed copper or aluminum wires(usually solid conductor of class1, stranded conductor of class 2,
including non-compacted and compacted methods as well as flexible conductor of class 5 according to IEC60228).
The conductor appearance is smooth without any stain, oxidation or mechanical damage.
Conductor Screen:
The conductor screen consists of an extruded semi-conducting polyethylene to minimize electrical stresses due to the stranded configuration of the conductor.
The semi-conducting material used for conductor screen has no deleterious effect on the conductor. Semiconducting tape is sometimes applied as a separator.
INSULATION:
The insulation material is extruded cross-linked polyethylene. The conductor screen, the insulation and the insulation screen mentioned to the following
clause are extruded simultaneously in one process to ensure that the screen and insulation are intimately bonded together and free from all possibilities
of voids between layers. The extrusion process is carried out under strictly controlled atmospheric conditions. The thickness of the insulation layer is
the maximum value figured out from the design of the impulse voltage and A.C. voltage. ? The conventional cross-linking process by saturated steam has
frequently caused deterioration of the electrical characteristics of the insulation as treeing phenomena arose when put to use for long time. But the new
process by N2 gas has enabled to protect the electrical characteristics from being deteriorated and to lessen the thickness of the insulation and accordingly
the cable’s outer diameter itself.
Insulation Screen:
The insulation screen is provided over the insulation by extruding the semiconducting compound concentrically and circularly to minimize the possibility of
ionization on the outer surface of the dielectric.
Metallic Armor:
The armor is a single layer of round wires or double tapes. Material for the armor shall consist of galvanized steel or aluminum. The armor for single core
cables for use on AC circuits shall consist of non-magnetic material (eg. aluminum) due to the excessive losses induced by steel armor. When round wire or tape
armor is required, in the case of single and multiple conductor cables, it shall be applied on an inner covering, if there is no screening. Where the metal
screening and the armor applied over the screening are of different metals, the two shall be separated by an extruded separation sheath. When a tape armor is
applied,the thickness of the inner covering shall be reinforced by a bedding tape. If a separating sheath is provided, the additional bedding tape is not
necessary. • The tape armor shall be applied helically in two layers so that the outer tape is approximately centered over the gap of the inner tape.
The gap between the adjacent turns of each layer of tape shall not exceed 50% of the width of the tape. The standard color of the inner covering and separation
sheath shall be black.
SHEATH:
To protect the metallic sheath from electrical or chemical corrosion, it is covered by PVC (ST2), PE (ST7) or halogen free (ST8) sheath. The outer sheath is
normally black but a color other than black may be provided by agreement between the manufacturer and the purchaser, subject to its suitability for the particular
conditions under which the cable is to be used.
Color:
Black or as client required.
Core Identification:
Multiple conductors shall be identified by color or numbering with a suitable method. The color code may be changed in any contract.
For 3.6/6kV ~ 18/30kV  Three core : Yellow, Green and Red colored tape applied between insulation screen and metallic screen.