IS 7098 : Part 3 : 1993 Cross-linked Polyethylene Insulated Thermoplastic Sheathed Cables - Specification - Part 3 : For Working Voltages from 66 kV up to and Including 220 kV

UDC 621.315.221.8 :678.073                                  ETD9

Reaffirmed 2019

1 Scope

1.1 This standard (Part 3) covers the requirements of single core, cross-linked polyethylene insulated, unarmoured or armoured (with or without lead alloy sheath) and thermoplastic outer sheathed cables for 3 phase ac earthed system for electric supply for the voltage grades given in Table 1.

1.2 Cables covered under this standard are suitable for use where the combined ambient temperature and temperature rise due to load result in conductor temperature not exceeding 90°C under normal operation and 250°C under short circuit operation.

2 References

IS 1885 : Part 32 : 1971 Electrotechnical vocabulary: Part 32 Cables, conductors and accessories for electricity supply

IS 5831 : 1984 PVC insulation and sheath of electric cables

IS 8130 : 1984 Conductors for insulated electric cables and flexible cords

IS 10810 Methods of test for cables:

Part 1 Annealing test for wires used in conductors

Part 3 Wrapping test for aluminium wires

Part 5 Conductor resistance test

Part 6 Thickness for thermoplastic and elastomeric insulation and sheath

Part 10 Loss of mass test

Part 11 Thermal ageing in air

Part 12 Shrinkage test

Part 14 Heat shock test

Part 15 Hot deformation test

Part 30 Hot set test

Part 32 Carbon content test for polyethylene

Part 34 Measurement of thickness of metallic sheath

Part 36 Dimensions of armouring material

Part 37 Tensile strength and elongation at break of armouring materials

Part 42 Resistivity test of armour wires and strips and conductance test of armour (wires/strips)

Part 53 Flammability test