The principle relies on the hierarchy of controls, where hazard avoidance and rigorous adherence to standard operating procedures (SOPs) minimize the probability of electrical contact. The body acts as a parallel path for current in the event of an insulation failure or accidental touch, characterized by Ohm's Law $I = \frac{V}{R_{body}}$. Since $V$ can be high and $R_{body}$ is relatively low under wet or grounded conditions, the resulting current $I$ can easily exceed the fibrillatory threshold, necessitating constant caution.

In technical exams, always choose the absolute safety-first option (e.g., 'Always', 'Verified', 'Disconnected') over conditional adverbs when dealing with safety-related questions.