MULTI CORE
MULTI CORE WIRE AND CABLES
MULTI ROUND CORE FLEXIBLE WIRES AND CABLES
A multi round core flexible cable houses two or more insulated conductors (cores) in a common outer sheath, simplifying routing, reducing clutter, and improving protection compared to running multiple single cores separately. Typical builds include copper conductors to IS 8130, PVC insulation, and PVC sheath per IS 694 for low-voltage power, lighting, control, and instrumentation circuits up to 1100 V.
- Conductor: Electrolytic grade annealed copper (typically 99.9%+) in class 2 or class 5 stranding for flexibility and low resistance.
- Insulation: PVC types Type A (general), Type B HR (heat-resistant), Type C1 FR (fire retardant), Type C2 FRLS-H (low smoke/halogen), and zero halogen options like ZHFR for critical occupancy.
- Sheath: PVC ST1/ST2/ST3 per application; typical rated voltage Uo/U 660/1100 V; test voltage between cores 3000 V for enhanced insulation integrity.
- Rated voltage: 0.6/1 kV (660/1100 V) for standard IS 694 multicore cables.
- Temperature: Continuous operation up to 70 °C for standard PVC; short-circuit temperature up to 160 °C for brief events per comparable PVC power cable data sets.
- Resistance and current: Example data for flexible multicore up to 2.5 sq mm shows conductor resistances such as 19.5 Ω/km at 1.0 sq mm and current ratings like 12 A at 1.0 sq mm under catalogued conditions; actual derating depends on grouping and cores loaded.
- Power and installation cables are commonly supplied in 2, 3, 4, and 5 cores up to large cross-sections (e.g., 4–300 sq mm), while control types span 6–25 cores typically up to 2.5 sq mm for signaling and control circuits.
- Flexibility: Class 5 stranding ensures tight bend radii and quick routing in panels and moving machinery.