An industrial accident is defined as an accident that occurs in an industrial setting due to human or environmental factors. The document discusses the main causes of industrial accidents, which are human error, lack of training, manufacturing defects, and improper maintenance. Human error is cited as the leading cause, where workers fail to follow safety procedures or use proper equipment. A lack of training means employees are unprepared to operate machinery. Manufacturing defects and lapses in maintenance can also lead to equipment failure and accidents.