When working on a high voltage circuit, you should always have another person present with you. This person should have a good working knowledge of the hazards associated with working on high voltage electrical circuits as well as the first aid techniques for treating electrical shock. What other knowledge is essential?
• Electrical safety procedures for high voltage work • Role of a safety observer/standby person during electrical maintenance • Difference between knowing the system layout vs. material ratings (insulation, ampacity, etc.)
• Ask yourself: What is the main job of the second person in a high-voltage work situation—are they primarily there to do engineering calculations or to act quickly and safely in an emergency? • Which option best helps this second person prevent an accident or make the system safe if something goes wrong? • Which type of knowledge would allow this person to safely secure the equipment (make it dead and safe to touch) if needed?
• Focus on practical safety control of the circuit, not design data or ratings. • Check which choice deals with how to make and keep the circuit safe (isolation, grounding, lockout/tagout concepts), not theoretical insulation or ampacity properties. • Eliminate answers that mainly deal with detailed electrical design parameters rather than emergency or safety response actions.
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