IS 692 : 1994 Paper insulated lead-sheathed cables for rated voltage upto and including 33 kv specification

1 Scope

1.1 This standard specifies general requirements andconstruction for impregnated paper insulated, lead sheathed cableswith copper or aluminium conductors having rated voltages from0.65/1.1 kV to 19/33 kV.

1.2 Maximum Permissible Operating Temperature

The temperatures given in the table below are applicable todraining impregnation and non-draining impregnation and areintended as a guide, based on values widely used, for carrying outthe tests:

Rated Voltages of    Highest        MaximumPermissibleCables               Voltage for    Continuous ConductorUo/U                 Equipment Um   Temperature-                    -              ScreenedCables        Belted CableskV                   kV            ï¿½C                ï¿½C0.65/1.1             1.2            -                    80

1.9/3.3 and 3.3/3.3  3.6            -                     80

3.8/6.6 and 6.6/6.6  7.2            -                    80

6.35/11 and 11/11    12             70                   6512.7/22              24             65                   -19/33                36             65                    -

where

Uo = rated power frequency voltage between conductor and screenor metallic sheath for which the cable is suitable,

U = rated power frequency voltage between phase conductors forwhich the cable is suitable, and

Um = maximum sustained power frequency voltage between phaseconductors for which the cable is suitable.

1.3 The lead alloy sheathed wire armoured copper conductor cableof MIND type covered by this standard may also be used in mines,provided the combined conductance of the armour and lead alloysheath, or in case when the purchaser so desires, the armour alone,shall be not less than 50 percent of the largest copper conductorcontained in the cable, with a minimum of copper equivalent of 15mm₂. To satisfy this, substitution of galvanizedsteel wire in armouring by required number of tinned copper wiresis permissible.

2 References

IS1885           Electrotechnical vocabulary:

Part 32 :1971   Part 32 Cables, conductors and accessoriesforelectricity supply

IS 3975 :1988     Mild steel wires, formed wiresand tapes for armouringof cables

IS 4905 :1968     Method for random sampling

IS 5831 :1984     PVC insulation and sheath ofelectric cables

IS 8130 :1984     Conductors for insulatedelectric cables and flexiblecords

IS 10418 :1982    Drums for electric cables

IS10810          Methods of test for cables:

Part 1 :1984    Annealing test for wires used inconductors

Part 2 :1984    Tensile test for aluminium wires

Part 3 :1984    Wrapping test for aluminium wires

Part 5 :1984    Conductor resistance test

Part 6 :1984    Thickness of thermoplastic andelastomeric insulationand sheath

Part 7 :1984    Tensile strength and elongation atbreak ofthermoplastic and elastomeric insulation and sheath

Part 8 :1984    Breaking strength and elongation atbreak forimpregnated paper insulation

Part 10 :1984   Loss of mass test

Part 12 :1984   Shrinkage test

Part 15 :1984   Hot deformation test

Part 24 :1984   Water soluble impurities test ofinsulating paper

Part 25 :1984   Conductivity of water extract test ofinsulating paper

Part 26 :1984   pH value of water extract test ofinsulating paper

Part 27 :1984   Ash content test of insulating paper

Part 34 :1984   Measurement of thickness of metallicsheath

Part 36 :1984   Dimensions of armouring material

Part 45 :1984   High voltage test

Part 47 :1984   Impulse test

Part 48 :1984   Dielectric power factor test

Part 50 :1984   Bending test

Part 51 :1984   Dripping test

Part 52 :1984   Drainage test

Part 53 :1984   Flammability test