IS 1554 Pt.1-1976

标准号：IS 1554 Pt.1-1976
发布日期：1977/2/1 12:00:00
实施日期：1999/12/31 12:00:00
适用范围：1.1 This standard (Part I) covers requirements and tests for armoured and unarmoured single-core, twin-core, three-core and multi-core copper or aluminium conductored PVG insulated and sheathed cables for electric supply and control purposes.1.2 The cables covered in this standard are suitable for use on ac single phase or three phase (earthed or unearthed) systems for rated voltages up to and including 1100 V. These cables may be used on dc system for rated voltages up to and including 1500 V to earth.Note 1 — The cables conforming to this standard may be operated continuously at a power frequency voltage 10 percent higher than rated voltage.Note 2 — 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 supplyshall be +-6/9 percent.1.3 The cables covered in this standard are suitable for use where the com-bination of ambient temperature and temperature rise due to load results in a steady conductor temperature not exceeding 70°C.1.4 Heavy duty armoured cables specified herein are suitable for use in mines also. However, for diese cables conductance of armour shall be not less than 75 percent of that of the largest conductor contained in the cable. To satisfy this, substitution of galvanized steel wires/strips in armouring by required number of tinned copper wires/strips is permissible.Note — Mining cables to be used in gassy mines shall be of copper conductor only.