IS 7098 Pt.2-1985

标准号：IS 7098 Pt.2-1985
发布日期：1986/4/1 12:00:00
实施日期：1999/12/31 12:00:00
适用范围：1.1 This standard .( Part 2 ) covers the requirements of following categories of crosslinked polyethylene insulated and PVC sheathed power cables for single phase or three phase ( earthed or unearthed ) systems for electricity supply purposes:a) Types of Cables1) Single-core unscreened, unarmoured ( but non-magnelic metallic tape covered ),2) Single-core screened, unarmoured;3) Single-core armoured ( non-magnetic ) screened or unscreened; and4) Three-core armoured, screened or unscreened.b) Voltage Grade (U0 /U )1) Earthed System — 1·9/3·3 kV, 3·8/6·6 kV, 6·35/11 kV,12·7/22 kV and 19/33 kV.2) Unearthed System — 3·3/3·3 kV and 11/11 kV.Note 1—Cables of 6·35/11 kV grade (earthed sytem ) are suitable for use on 6·6/6·6 kV ( unearthed system ) also.Note 2 — The cables conforming to this standard may be operated continuously at a power frequency voltage 10 percent higher than rated voltage.Note 3 — Under Rule 54 of the Indian Electricity Rules 1956, in case of high voltage, the permissible variation of declared voltage at the point of commencement of supply is ±69+ percent.1.2 These cables are suitable for use where combination of ambient temperature and temperature-rise due to load results in conductor temperature not exceeding 90°C under normal operation and 250°C under short-circuit conditions.1.3 Armoured cables up to 11 kV grade specified in this standard are suitable for use in mines also. However, for such cables, additional requirements have been included, wherever necessary ( 3.1.1, 16.5 and 20.2 )