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For small distribution line which conductor use?
AAC
Copper conductors
Tungsten
Any of the above
AAC
For small distribution lines, All Aluminium Conductors (AAC) are the preferred choice due to their optimal balance of weight, cost, and conductivity. In urban and short-span distribution networks, the mechanical stress requirements are lower, making the lighter weight and corrosion resistance of AAC advantageous compared to heavier conductors.
For small distribution lines, All Aluminium Conductors (AAC) are the preferred choice due to their optimal balance of weight, cost, and conductivity. In urban and short-span distribution networks, the mechanical stress requirements are lower, making the lighter weight and corrosion resistance of AAC advantageous compared to heavier conductors.
R=╧БALтАЛ тАФ Relation between resistance, resistivity, length, and cross-sectional area
PlossтАЛ=I2R тАФ Power loss calculation in the distribution conductor
AAC is composed of stranded aluminium wires, typically having a conductivity of about 61% IACS. Because it lacks a steel core (unlike ACSR), it is highly flexible and lightweight. This makes it suitable for short-span distribution where the sagging constraints are minimal, and high tensile strength is not the primary design driver.
AAC stands for All Aluminium Conductor.
AAC is widely used for low-voltage distribution and short-span transmission lines.
It provides excellent corrosion resistance due to the formation of a natural oxide layer on aluminium.
AAC has a lower strength-to-weight ratio compared to ACSR, making it unsuitable for very long, high-tension spans.
Cost-effective due to abundant material availability
Lightweight reducing structural burden on poles
High corrosion resistance
Lower tensile strength than ACSR
Higher sag on long spans
Not suitable for extra-high voltage (EHV) transmission
Low voltage residential distribution lines
Short span rural distribution networks
Internal busbar connections in substations
| Feature | AAC | ACSR |
|---|---|---|
Core Material | Aluminium only | Aluminium & Steel |
Strength | Moderate | High |
Copper conductors (Option B) are rarely used in modern overhead distribution due to high theft risk and significantly higher cost despite superior conductivity.
Tungsten (Option C) is used for lamp filaments due to its high melting point, not for power transmission.
Standard specifications for AAC conductors are governed by IS 398 (Part 1).
A is correct тАФ AAC is the standard conductor material for short-span, low-voltage distribution networks due to its lightweight and cost-effective nature.
Always evaluate the span length: if it is small, favor AAC for economy; if it is large, favor ACSR (Aluminium Conductor Steel Reinforced) for mechanical strength.