At a minimum threshold, how many milliamps of current through the body produces a condition where most people would be unable to let go of the energized electrical conductor due to involuntary muscular contraction?
⢠Let-go current: the current at which a person can no longer voluntarily release an energized object ⢠Difference between perception threshold (you can feel it) and pain/lock-on threshold (you canât let go) ⢠How increasing milliamps (mA) affects muscle control vs. just sensation
⢠Which choice best matches the point where hand and forearm muscles contract so strongly that voluntary release is no longer possible for MOST people? ⢠Look at the lowest range where loss of muscular control is typically reported, not just feeling a tingle or mild pain. ⢠Compare the numbers: which range is commonly cited in safety materials as the âlet-goâ threshold for 60 Hz AC current through the body?
⢠Verify which mA range is associated with âlet-goâ or âinvoluntary muscle contractionâ, not fibrillation or severe burns. ⢠Eliminate options that are clearly in the just noticeable / mild shock range. ⢠Eliminate options that describe more severe effects (like respiratory arrest or VF) rather than the first point where the person canât let go.
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