IS 9968 : Part 2 : 2002 Specification for Elastomer-insulated Cables - Part 2 : For Working Voltages from 3.3 kV up to and Including 3 3kV

1 Scope

1.1 This standard (Part 2) covers the requirements of heatresisting elastomer insulated cables for fixed installations andflexible cables for single phase or three phase system, suitablefor voltage (U₀/U) 1.9/3.3; 3.8/6.6, 6.35/11,12.7/22 and 19/33 kV for electricity supply purposes.

Note 1 - For unearthed voltage grade following selectionprocedure to be adopted.

Cables of 1.9/3.3 kV, 6.35/11 kV and 12.7/22 kV grades (earthedsystems) are also suitable for use on 3.3/3.3 kV, 6.6/6.6 kV and11/11 kV grades (unearthed systems) respectively.

Note 2 - The cables conforming to this standard may be operatedcontinuously at a power frequency voltage 10 percent higher thanrated voltage.

Note 3 - Under Rule 54 of the Indian Electricity Rules 1956, incase of high voltage, the permissible variations of declaredvoltage at the point of commencement of supply is⁺⁶_-9 percent.

1.2 These cables are suitable for use where combination ofambient temperature and temperature rise due to load results inconductor temperature not exceeding 90�C undernormal operation and 250�C under short circuitconditions.

2 References

IS 1885 : Part 32 : 1993 Electrotechnical vocabulary:Part 32 Electric cables

IS 3975 : 1999 Mild steel wires, formed wires and tapes forarmouring of cables

IS 4905 : 1968 Methods for random sampling

IS 5831 : 1984 PVC insulation and sheath of electric cables

IS 6380 : 1984 Elastomeric insulation and sheath of electriccables

IS 8130 : 1984 Conductors for insulated electric cables andflexible cords

IS 10418 : 1982 Specification for drums for electric cables

IS 10462 : Part 1 : 1983 Fictitious calculation method for determinationof dimensions of protective coverings ofcables:Part 1 Elastomeric and thermoplasticinsulatedcables

This Standard has Two Amendments.

Amendment 1 and 2 is Added.