A method and apparatus for electrical discharge machining of a workpiece wherein an erosion pulse is applied on the tool electrode. In one embodiment, a system for supporting a solar panel array includes the use of support columns and cables suspended between the support columns, with the solar panels received by solar panel receivers that are adapted to couple to the cables. A service element of the computing system is operable to cause a built-in-self-test to be executed to test the cache memory, the BIST being operable to determine whether any of the subdivisions is defective. The distal surface of the male andor female end is brought into axial abutting contact against a corresponding abutment surface.