The History of Aluminum Cable in the U.S.
Stage One :The inappropriate pure aluminum cable and copper connection terminals triggered accidents.
Stage Two :Based on pure aluminum material 8000 series aluminum alloy were produced, which aims at enhancing the creep property of general aluminum cable and solving the problem of connection terminals.
Sate Three:In 1985,the U.S .Electrical Law stipulates that in 2000V below some types of wire aluminum conductor should be used 8000 series aluminum alloy.The United States, aluminum alloy cable were just used for low pressure part of the field, not the medium pressure field.
Stage four:With the implement of B800 Standard in 1988, the U.S . aluminum alloy cable’s history is no more than 30 years.
1350 aluminum and 8000 series aluminum
A1350 electrical aluminum is pure aluminum, The aluminum composition of 1050 aluminum is 99.5% min.8000 series aluminum belong to other aluminum alloy series. Its aluminum composition is 98%min. Si ,Cu, Fe ,Me, and other trace elements takes up totally 1% -1.5% in 8000 aluminum alloy. This means that the 8000 series aluminum alloy is based on pure aluminum, adding a little trace element, The trace element can improve the creep properties of aluminum,making it suitable for manufacturing aluminum alloy cable, and did not change the properties of aluminum.
Therefore,compared with 1000 series pure aluminum,8000 series aluminum alloy’s performance has no a fundamental improvement,and its creep resistance has been enhanced.
From the aluminum alloy product standard indicators we know that 8000 series aluminum alloy’s mechanical tensile strength is lower than the pure aluminum and pure copper by 30% and 100% respectively.Thus, fracture and cracks are more often seen on 8000 series aluminum alloy cable,which undoubtedly is a major risk for the stable operation of the cable.
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