IS 9968 : Part 1 : 2025 Elastomer Insulated Cables - Specification - Part 1 for Working Voltages up to and Including 1 100 volts
1 SCOPE
1.1 This standard specifies the requirements of elastomer/rubber/silicon insulated cables for fixed wiring cables, flexible cables and flexible cords for electric power and lighting for operation at voltages up to and including 1 100 volts.
1.2 The following types of cables and cords are covered in this standard:
1.2.1 Cables for Fixed Wiring
a) Braided and compounded/varnished;
b) Elastomer sheathed (normal duty);
c) Elastomer sheathed (normal duty) with earth continuity conductor;
d) Rubber insulated and/or sheathed cables; and
e) Silicon Insulated and/or sheathed cables.
1.2.2 Flexible Cables
a) Braided and varnished;
b) Elastomer sheathed (heavy duty); and
c) Rubber/silicon insulated sheathed cables.
1.2.3 Flexible Cords
a) Braided or unbraided;
b) Elastomer Sheathed (normal duty);
c) Unkinkable flexible cords - braided and compounded (workshop type); and
d) Unkinkable flexible cords - braided and compounded.
1.3 The cables covered in this standard are suitable for use on single-phase or three-phase (earthed or unearthed) system for rated voltages up to and including 1 100 volts. These cables may be used on dc system for rated voltages up to and including 1 500 volts to earth.
1.4 The cables covered in this standard are suitable for use where the combination of ambient temperature and temperature rise due to load results in conductor temperature not exceeding the following:
2 REFERENCES
The standards listed in Annex A contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibilityof applying the most recent edition of these standard.
Sl No.
(1) | Type of Insulation
(2) | Normal Continuous Operation
(3) | Short-Circuit Condition
(4) |
| i) | Insulation for general service | 60°C | 200°C |
| ii) | Heat resisting insulation | 90°C | 250°C |
| iii) | Silicon rubber insulation | 150°C | 350°C |
Note: The short-circuit temperatures mentioned above are based on intrinsic properties of the insulating materials. It is essential that the accessories used in the system, with mechanical and/or soldered connections, are suitable for these temperatures.