The question is worded:
Which of the following is not a rule of thumb when concerning arc flash:
a. Incident energy decreased by the inverse square of the distance
b. Incident energy is proportional to time
c. Each layer of clothing under arc-rated reduces the heat to the body by 50%
d. Incident energy is inversely proportional to the short circuit current
D is the correct answer as incident energy is directly proportional to the short circuit current. THe question doesn't like that answer though
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