1, the lack of electricity: lack of current, voltage, resistance and other basic electrical knowledge, resulting in the operation process can not correctly determine the safety of electrical equipment, increasing the risk of electrocution.
2, equipment failure: due to improper management of electrical equipment, long-term use of aging electrical equipment, not timely replacement of damaged insulation materials, resulting in equipment failure, increasing the risk of electric shock.
3, environmental factors: the installation of cables and equipment in the environment of conductive media and corrosive media, which can easily lead to aging and damage to the insulation material, increasing the risk of electric shock.