cable is an important part of transfering electricity all around the world and actually the quility is so important because the lack of quality can cause damages and fire. 

Also the quallity has direct impression on price but the important point is to buy cable with the best price and quality.

There are different sizes of cable wich is used in different places, the bigger size is used in industrial places and smaler sizes use in building and houses.

The parts of cable is copper, aluminum and PVC coating and copper can transfer better than aluminum and copper is heavier and more expensive than aluminum.