Aluminum-core wire and cable, with aluminum as the core conductor, are widely used in power transmission and distribution systems. 

Their key features include:

1. Lightweight and Economical: Aluminum's density is only approximately 30% of copper's, significantly reducing cable weight and lowering transportation and installation costs.

 Aluminum's price is significantly lower than copper, offering significant material cost advantages and making it particularly suitable for large-section, long-distance lines.

2. Conductivity: Aluminum's conductivity is approximately 61% of copper's. To achieve a similar current-carrying capacity, 

the cross-sectional area of an aluminum conductor must be approximately 1.6 times larger than that of copper.

3. Applications: Primarily used in fixed installations such as high-voltage/ultra-high-voltage overhead transmission lines (a core advantage), 

medium- and low-voltage distribution networks, and main power supply systems for large buildings and factories.

4. Key Considerations

*High Connection Requirements: Aluminum is susceptible to oxidation, resulting in high contact resistance and heat generation at the connection. 

Specialized copper-aluminum transition terminals, anti-oxidation compound grease, and rigorous processing techniques are essential to prevent loosening and failure.

*Mechanical Strength: Pure aluminum has lower tensile strength and creep resistance than copper, requiring greater care during connection and bending. 

Specially treated aluminum alloys can improve this property.