1, yes. General cable life assessment is based on the thermal characteristics test of materials, calculated according to arrhenius formula and least square method, and then simulated according to the calculation results. If the test results meet the expected requirements, it can be inferred that the cable life meets the calculation results, and the process is complicated. Generally, cables are not evaluated by life test, but only materials are identified. At present, the service life of cables is 20-30 years, and common materials such as PVC, XLPE, EPR and so on.

2. Cables are usually rope-like cables twisted by several or several groups of steel wires (at least two in each group). Each group of wires is insulated from each other and often twisted around a center, and the whole shell is covered with a highly insulating coating. The cable has the characteristics of internal electrification and external insulation.