The main group of cables is flexible cables so termed to indicate that they consist of one or more cores each containing a group of wires the diameters of the wires and the construction of the cable being such that they afford flexibility. They are generally used for trailing cables and similar applications where heavy currents up to 630A (0.3, 0.4, 0.5, 0.6 mm) are to be carried for instance to welding plant.