Question 48Electricity & Electronics - Assistant Engineer

The correct answer is C) 30 mA. The threshold for respiratory paralysis and inability to breathe due to electric current through the body is generally considered to be around 30 mA. At this level of current, the muscles responsible for breathing become paralyzed, leading to a potentially life-threatening situation if the person remains in contact with the energized conductor. The other answer choices are not correct because 3-7 mA (A) is typically the range for muscle contraction and loss of muscle control, while 10-16 mA (B) is the range for inability to let go of the conductor. 75 mA for 5 seconds (D) is a higher level that can cause ventricular fibrillation and cardiac arrest, rather than just respiratory paralysis.