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Why Can't Power Cables Be Aluminum Alloy Cables?

Jun. 20, 2019

As a High Voltage Power Cable Supplier, let's analyze why the power cable cannot choose an aluminum cable. From the characteristics of aluminum alloy cables, aluminum alloy cables have natural defects in fire protection and corrosion protection. It is manifested in the following 8 aspects:

1. Corrosion resistance, 8000 series aluminum alloy is not as good as ordinary aluminum.

2. Temperature resistance, aluminum alloy is much different than copper.

Copper has a melting point of 1080 ° C and aluminum and aluminum alloys have a melting point of 660 ° C, so copper conductors are a better choice for fire resistant cables.

3. The thermal expansion coefficient of aluminum alloy is much higher than that of copper, and AA8030 aluminum alloy is even higher than ordinary aluminum.

Fireproof Cable

4. Aluminum alloy does not solve the problem of aluminum oxidation.

Aluminum or aluminum exposed to the atmosphere quickly forms a hard, strong but brittle, film of approximately 10 nm thickness with high electrical resistivity, and its hardness and adhesion make it difficult to form conductive contacts. This is why aluminum and aluminum alloys must be removed from the surface oxide layer before installation. The copper surface is also oxidized, but the oxide layer is soft and easily breaks down into a semiconductor when subjected to force, forming a metal-metal contact.

5. Aluminum alloy cables have improved in terms of stress relaxation and creep resistance but are far less than copper.

The addition of specific elements to the general aluminum can improve the creep properties of the general aluminum, but the degree of improvement is also very limited compared with the general aluminum, and there is still a huge gap compared with copper.

6. Aluminum alloy cables do not address the reliability of the aluminum connection.

7. Aluminum alloy cable joints are complex in process and easy to keep hidden.

If you want to know more about Fireproof Cable, please pay attention to our website. https://www.hy-cables.com

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