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Examoogle • User • info@examoogle.com • EE-2024-8821
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Low tension cables are generally used upto
200 V
500 V
700 V
1000 V
1000 V
Quick Summary: Low Tension (LT) cables, also known as Low Voltage cables, are designed for power distribution at voltage levels up to 1 kV (1000 V). These are commonly used in residential and commercial buildings for internal wiring and distribution networks.
Low Tension (LT) cables, also known as Low Voltage cables, are designed for power distribution at voltage levels up to 1 kV (1000 V). These are commonly used in residential and commercial buildings for internal wiring and distribution networks.
VLT≤1000 V — Voltage limit for Low Tension designation
The categorization of cables into Low, Medium, High, and Extra-High voltage is based on the insulation level required to prevent dielectric breakdown. Cables rated up to 1000 V are classified as Low Tension because the electrical stress on the insulation is manageable with standard thermoplastic (PVC) or cross-linked polyethylene (XLPE) compounds, requiring minimal thickness compared to HV cables.
Low tension cables are primarily used for domestic and light industrial power distribution.
The 1000 V limit is a standard classification set by the International Electrotechnical Commission (IEC) and Indian Standards (IS).
Beyond 1000 V up to 11 kV, cables are typically classified as High Tension (HT).
Cost-effective insulation materials
Easy to install and terminate
High flexibility for indoor use
Not suitable for long-distance bulk power transmission due to high ohmic losses
Limited dielectric strength for high-voltage applications
Residential interior wiring
Building service mains
Low-power industrial lighting and machine control
In industrial contexts, cables rated for 1.1 kV are often grouped with LT cables as the nearest standard insulation rating.
Options A, B, and C are incorrect as they underestimate the standard threshold defined by electrical standards.
D is correct — Low tension cables are standardized for operation at voltages up to 1000 V.
Always remember the hierarchy: LT (≤ 1 kV), HT (1 kV to 33 kV), and EHT (> 33 kV) to quickly classify power system equipment.