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VIR cables are usually used for
Internal wiring of buildings
6.6 kV
11 kV
33 kV
Internal wiring of buildings
VIR (Vulcanized Indian Rubber) cables are electrical conductors insulated with a layer of vulcanized rubber. Due to the degradation of rubber when exposed to atmospheric conditions and its limited dielectric strength, these cables are strictly restricted to low-voltage internal wiring in residential or commercial buildings.
VIR (Vulcanized Indian Rubber) cables are electrical conductors insulated with a layer of vulcanized rubber. Due to the degradation of rubber when exposed to atmospheric conditions and its limited dielectric strength, these cables are strictly restricted to low-voltage internal wiring in residential or commercial buildings.
VmaxтАЛтЙИ440V тАФ Typical maximum voltage rating for basic low-voltage VIR indoor wiring systems.
The vulcanization process involves heating raw rubber with sulfur to improve its mechanical strength and elasticity. However, the rubber insulation is prone to chemical oxidation and corrosion when in contact with bare copper conductors. Consequently, these cables are limited to low-voltage applications (typically up to 250V or 440V) and are unsuitable for medium or high-voltage transmission, which requires superior insulation like PILC or XLPE.
VIR stands for Vulcanized Indian Rubber.
The insulation is sensitive to oil, moisture, and chemical attack.
Largely obsolete in modern power systems, replaced by PVC or XLPE cables.
Used primarily for domestic indoor wiring where mechanical stress is minimal.
Flexible and easy to handle during installation.
Cost-effective for very low-voltage indoor applications.
Rubber reacts with copper, causing oxidation (requires tinned copper conductors).
Low dielectric strength makes it unsuitable for high voltages.
Poor resistance to fire, heat, and atmospheric weathering.
Internal wiring of residential buildings.
Temporary low-power electrical connections.
Options B, C, and D refer to medium and high voltage levels (6.6 kV, 11 kV, 33 kV). VIR cables lack the necessary dielectric insulation layers (like impregnated paper or cross-linked polyethylene) to withstand these high electrical stresses.
To prevent copper corrosion, VIR cables traditionally used tinned copper conductors.
A is correct тАФ VIR cables possess low dielectric strength and chemical instability, limiting them to low-voltage internal wiring of buildings.
Remember that modern cable insulation selection is driven by VratedтАЛ and environmental conditions; PVC is used for general purpose low-voltage, while XLPE is the standard for high-voltage cables due to its superior thermal and dielectric properties.