Discussion
Which voltage class requires insulating gloves and special training?
Answer: D
Traction systems operating at hundreds of volts present a genuine electrocution risk and require certified equipment and training. Twelve volts cannot drive a dangerous current through skin, though it can certainly cause burns through a ring or a spanner. Tracing the requirement back to the physical constraint that produces it makes the answer follow. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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