_____ use caution when working near electricity.

Question

Examoogle · Accepted Answer

Always

Explanation: Electrical safety protocols dictate that one must always exercise caution when working near live circuits or electrical installations to prevent injury from electric shock, arc flash, or equipment damage. Electricity is often invisible and unpredictable; therefore, consistent application of safety measures is mandatory for hazard mitigation.

Working Principle: 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.

Key Formulas: $I = \frac{V}{R}$ — Ohm's Law governing current flow through the body; $P = I^2 R$ — Power dissipated as heat during electrical injury

Key Points: Always assume equipment is live unless proven de-energized and tested.; Use LOTO (Lockout/Tagout) procedures for maintenance.; Rubber-insulated gloves and PPE (Personal Protective Equipment) are mandatory.; Maintain appropriate clearance distances as per NEC or IS standards.

Advantages: Prevents accidental electrocution; Reduces risk of fires caused by short circuits

Disadvantages: May decrease speed of operations; Requires constant training and vigilance

Applications: Industrial plant maintenance; Domestic wiring repair; High-voltage transmission line work

Additional Info: The fibrillatory threshold for human heart is typically between 50mA to 100mA depending on duration.. Option B, C, and D are incorrect as they imply safety is conditional, whereas electrical hazards are persistent.

Answer: A is correct — One must always practice safety protocols because electrical hazards are pervasive and can result in fatal consequences even from minor lapses in attention.

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

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