Electricity is the lifeblood of 21st century industry, powering everything from automated production lines to ATMs and artificial intelligence.
When it’s not used correctly, however, it can prove deadly to workers.
Electrical shock is among the leading causes of job-related injuries and fatalities in the U.S. each year, according to the Electrical Safety Foundation. In the 12 years through 2022, the U.S. Occupational Safety and Health Administration recorded 1,322 workers killed in such cases, with 70 percent employed in non-electrical jobs.
The numbers have prompted not only scrutiny from government regulators but also progressively tighter rules governing employee safety and the development of state-of-the-art virtual reality training programs.
“The unique physical properties of electrical energy that allow it to power our world also make it extremely dangerous,” a report collected by the National Library of Medicine says, a situation complicated by the fact that many workers are unaware of potential electrical hazards.
Fatal Exposure: NFPA 70E
The combination of relatively high electrical energy levels in many environments with the human body’s comparatively low resistance “poses significant risks for any person who comes in contact,” the report explains.
While a person exposed to one milliamp of electrical current might barely perceive it, he or she would experience muscle paralysis when exposed to 20 milliamps and might be killed by 100 milliamps, the report explains.
The heart stops beating at 2 amps, but roughly 10 times that amount—20 amps—is required to trip many fuse breakers, underscoring the risk of workplace electrical exposure, the report says.
Among the latest steps to address that risk is the 2024 update to the National Fire Protection Association’s Standard 70E, a consensus guideline on electrical safety practices referred to by the U.S. Occupational Safety and Health Administration.
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