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?

Correct Answer: Option D — working knowledge of the circuit being worked on and all means of isolation and grounding

USCG high-voltage safety rules and IEEE 45 require qualified safety personnel to possess comprehensive knowledge of the specific circuit, isolation procedures, and positive grounding methods to prevent fatal electrical accidents.