Discussion
Which threshold determines whether a system needs shock protection?
Answer: B
Below about sixty volts direct current the shock risk is considered low, which is why forty eight volt systems avoid the full high voltage regime. Above it, orange cabling, interlocks and training are required. The threshold shapes the whole architecture. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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