At what amperage does grip paralysis threshold occur?

• A. 5-15 mA
• B. 15-50 mA
• C. 100-300 mA
• D. 300-700 mA

Answer: (B)

The grip paralysis threshold typically occurs at an amperage range of 15-50 mA. At this level of electrical current passing through the human body, muscular contractions can become uncontrollable, and the individual may be unable to release their grip on a conductor. This paralysis happens because the electrical current disrupts normal muscle and nerve function, affecting the ability to control movement. Understanding this range is crucial for safety in both residential and industrial electrical environments, as it highlights the significant risks associated with electrical shock.

The other ranges provided, while they indicate various levels of potential harm or reaction to electrical current, are generally associated with different physiological responses. For example, lower ranges can cause a sensation of shock or pain, while higher currents can lead to severe injuries or even fatality, but they do not correlate specifically with the grip paralysis phenomenon.