The cable fault tester under UHV power can help many power workers conduct various power tests more conveniently.

There are many reasons why cables may malfunction during use, and the most serious of them can lead to fires or other serious malfunctions.  

Some of the main reasons for cable failures include:

ageing:

If the expected service life of the cable exceeds its designed optimal operating conditions, it can significantly reduce the service life of the cable. The aging process often leads to embrittlement, cracking, and eventual failure of insulation and sheath materials, exposing conductors and potentially causing short circuits, which may be the cause of electrical fires.

Application:

If the selected cable is not suitable for the application, it is more likely to fail in service. For example, cables that are not strong enough for the environment, or mechanically strong enough to wear and tear or have chemical resistance to environmental conditions, are more likely to fail than cables whose structure is suitable for the installation environment.

Mechanical malfunction:

If the cable is damaged during installation or subsequent use, its integrity will be affected and its service life and applicability will be reduced.

Degradation of cable sheath:

There are various reasons why sheath materials may degrade, including overheating or undercooling, chemicals, weather conditions, and wear of the sheath. All these factors will ultimately lead to electrical failures, as the insulation core is no longer protected like the originally designed sheath.

Insulation moisture:

Moisture ingress can cause serious problems, including short circuits and corrosion of copper wires.

Cable heating:

Excessive heating of cables can lead to degradation and premature failure of insulation and sheath materials. 

Electrical overload:

Electrical overload typically occurs when cables are underestimated for use in applications or when excessive loads are applied to the cables. In home applications, this is often due to too many devices being plugged into one socket and overloading the wiring to a single socket, expansion adapter, or combination socket.

Rodent attacks:

Rodents often attack outer cables. This type of damage may be widespread, significantly reducing the sheath or insulation performance of the cable, which is another possible source of electrical fire.

Ultraviolet irradiation:

Exposure to ultraviolet radiation can have a significant impact on cable insulation and sheath. Cables that may be exposed to ultraviolet radiation should be designed with anti ultraviolet materials with appropriate carbon black content, or protected with protective coverings such as installed in cable conduits to avoid direct sunlight. UV exposure often leads to insulation rupture and potential short circuit faults as a result.