Electrical Hazard Identification & Risk Assessment Flashcards
7 cards from real ESC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Electrical Hazard Identification & Risk Assessment flashcards as text
Which of the following best describes 'double insulation' as a safety feature on power tools?
Answer: An internal design using two independent insulation systems so no grounding conductor is needed
Double-insulated tools use two separate layers of insulation between live parts and the user, eliminating the need for an equipment grounding conductor.
When should an arc flash risk assessment be updated?
Answer: Whenever a major modification to the electrical system occurs or at regular intervals not exceeding 5 years
NFPA 70E requires arc flash risk assessments to be reviewed and updated whenever major electrical system changes occur or at least every five years.
A worker notices a burning smell near an electrical panel but sees no visible damage. The FIRST action should be:
Answer: Treat it as a potential hazard, evacuate the area, and notify the appropriate personnel
A burning smell indicates possible overheating or arcing inside the panel; the correct response is to treat it as a serious hazard and alert qualified personnel rather than self-investigating.
Which type of electrical fault has the highest potential to cause an arc flash?
Answer: An arcing three-phase fault
Arcing three-phase faults produce the highest incident energy and are the primary driver of severe arc flash hazards in industrial systems.
What does the hierarchy of risk controls recommend as the MOST preferred method to address an electrical hazard?
Answer: Eliminate the hazard entirely
The hierarchy of controls places elimination at the top because removing the hazard entirely is the most effective protection.
A 'touch potential' hazard most commonly occurs when:
Answer: A person touches a grounded metal object while standing on energized soil
Touch potential is the voltage difference between a grounded object and the ground surface, which can drive current through a person who contacts both simultaneously.
What information is typically found on an arc flash label affixed to electrical equipment?
Answer: Nominal voltage, incident energy, flash protection boundary, and minimum PPE category
NFPA 70E requires arc flash labels to include nominal voltage, incident energy or PPE category, and the flash protection boundary to inform workers of hazards.