10 advantages of copper-based power cables over their aluminium equivalents
The basic expectations from a power cable include less resistivity, good flexibility, good strength, good stability against fatigue, good corrosion resistance etc. Although for the sake of economy of initial installation, in India we often find use of aluminium conductor-based power cables; the total life-cycle cost of such cables is more than their copper–conductor-based equivalents. Let us see 13 advantages of copper-based power cables over their aluminium equivalents.
• Copper cables offer low resistivity. The aluminium power cables offer almost 1.68 times more resistivity than their copper cables.
• Copper cable alloys offer 20-40% elongation, so the average goes to around 30% whereas for aluminium it is around 18%.
• Copper cables can bear much higher stress than aluminium cables.
• Copper offers more than 1.5 times better elasticity than aluminium, so copper wires have more antifatigue property than aluminium wires.
• With the same cross-section, copper conductor-based wires can show almost 30 times better load capacity than aluminium conductor-based wires.
• Copper conductors show better corrosion resistance than aluminium conductors.
• Out of identical samples of copper and aluminium conductors, copper conductors show much lower voltage drop owing to their low resistivity.
• Out of identical samples of copper and aluminium conductors, with the same amount of current through both, copper will be less hot. Thus, it provides enhanced value of safety.
• Due to lower resistivity, copper-based wires show lower loss of energy than aluminium-based wires.
• Permissible bending radius is smaller for copper wires, thus those are easy for handling during wiring.