Cable testing and diagnostics are various techniques used to help assess the overall insulation quality of medium voltage cable systems, such as withstand testing, tan delta testing, and partial discharge testing.

The testing of wires and cables can be carried out using different tests, such as tensile tests, fatigue tests or hardness tests. The characteristic values determined from these tests are used to evaluate the load capacity of the material. All metals can be formed into wire, which is a very common metal product.