Wires and cables will naturally age over time. By recognizing these signs in advance, problems can be dealt with in a timely manner.
The most obvious sign is the change in the outer skin. The originally smooth and tough outer skin gradually becomes hard and brittle, and easily falls and cracks with a gentle fold. This indicates that the outer skin has aged and cannot provide good protection anymore. In some areas, there may be obvious bulges and stickiness on the outer skin, which is also a signal that internal problems have begun to occur.
When used normally, even though there are not many high-power devices connected, the wires often inexplicably heat up, and even a faint burnt smell can be smelled, which is also a manifestation of aging of the circuit. There is also a situation where the circuit is not damaged, but often experiences tripping and poor contact. After excluding electrical problems, it is highly likely that the internal core has aged and oxidized, resulting in a decrease in conductivity.
Don't ignore these signs and replace the corresponding lines in a timely manner to avoid more serious problems in the future.