2.3. Protective sheath
The protective sheath must meet conditions related to the cable environment, such as:
The temperature;
The presence of water, dust;
The possibility of mechanical shocks, etc ....
The mechanical properties of the insulation part are not always sufficient to protect the cable from external influences. To correct this, the insulation is covering with a protective sheath which must have characteristics like:
Mechanical (tensile strength, torsional bending, shock);
Physical (resistance to heat, cold, moisture, fire);
Chemical (corrosion resistance, aging).
Underground cables: An underground cable essentially consists of one or more conductors covered with suitable insulation and surrounded by a protecting cover.
Is used as cladding materials or insulating materials such as PVC and CBP, or metallic materials such as lead, aluminium, steel strip.
