Using a personal fall arrest system is no different than using any other personal protective equipment. In the hierarchy of protection, it is the last resort. The first step should be to remove fall hazards through engineering controls, such as guardrails.
According to the U.S. Bureau of Labor Statistics, more than 50 workers die annually in excavation and trenching accidents. Though most electricians are not directly involved in excavating operations, electrical workers may get involved when completing underground line work.