The human body's "can't let go" reaction to 60Hz current begins at approximately what current?

The "can't let go" reaction in response to electrical current, often referred to as the "let-go threshold," occurs at around 10-20 mA for a frequency of 60 Hz, with many sources suggesting that it typically starts to occur at approximately 16 mA. This is the level at which the electrical stimulus causes involuntary muscle contractions, making it difficult for a person to let go of the source of the electrical current.

At currents above this threshold, prolonging exposure can lead to more severe physiological effects, including possible injury or fatality. Understanding this threshold is critical for professionals working with electrical equipment in biomedical settings, as it informs safety protocols and risk assessment in environments where electric shocks may occur.