Which of the following is NOT one of the three basic measures to avoid electric shock?

• A. Shielding
• B. Insulation
• C. Isolation
• D. Grounding

Answer: (A)

The main idea here is understanding the protective methods used to prevent electric shock. The three core safeguards are insulation, isolation, and grounding. Insulation uses non-conductive materials to block current from reaching you. Isolation means keeping live parts out of reach by separating them from where you work or touch. Grounding provides a safe path for fault current to earth, helping keep exposed surfaces at earth potential and enabling protective devices to trip if a fault occurs. Shielding, while useful for reducing exposure to electric fields or for equipment protection, does not prevent contact with live parts or provide a fault path. Because of that, shielding isn’t one of the standard basic measures to avoid electric shock.