Which shock value can potentially lead to involuntary muscle contractions preventing a victim from pulling away?

The value of 20mA is significant because it falls within a range of electrical current that can induce involuntary muscle contractions in a person who is experiencing an electric shock. Specifically, currents above 10mA can lead to a condition known as “fixed contraction,” where the muscles contract so strongly that the individual cannot release their grip from the source of electricity.

At 20mA, this effect becomes more pronounced, increasing the risk of serious injury or fatality as the person is unable to pull away from the electrical source due to muscular paralysis or spasms. This is critical knowledge for electricians and individuals working with electrical systems, as it highlights the importance of safety measures to prevent exposure to such electrical currents which can be lethal. Understanding these thresholds of shock can guide the implementation of effective protective gear and protocols to ensure the safety of individuals working in environments that involve electricity.