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 is a leading indicator that an electrical system may be overloaded?
Answer: All of the above
All three signs — tripping breakers, warm covers, and dimming lights — are warning indicators of an overloaded or stressed electrical system.
Step potential is a hazard that arises when:
Answer: A voltage gradient exists in the soil and current flows between a person's feet
Step potential occurs when current spreads through the ground from a fault point, creating a voltage difference across the distance of a person's stride.
Which PPE Arc Flash Category (CAT) requires an arc rating of at least 40 cal/cm²?
Answer: Category 4
NFPA 70E PPE Category 4 requires arc-rated clothing and equipment with a minimum arc rating of 40 cal/cm² for the highest-risk tasks.
Why is it important to use a non-contact voltage tester before touching any wire or terminal?
Answer: To verify the absence of voltage without making direct contact with conductors
A non-contact voltage tester allows workers to detect the presence of voltage from a safe distance before any physical contact is made.
Which factor does NOT affect the severity of an electric shock?
Answer: The color of the electrical insulation on the conductor
Insulation color is a labeling convention and does not determine shock severity; the key factors are current magnitude, path, duration, and body resistance.
What is the purpose of performing an 'energized electrical work permit' process?
Answer: To formally document the justification, hazards, and controls required before performing live electrical work
An energized electrical work permit requires documented justification and approval for live work, ensuring all hazards and protective measures are identified before beginning.
A worker is using a voltage tester rated CAT III 600V. Which application would EXCEED this tool's safe rating?
Answer: Testing a 4,160V medium-voltage switchgear bus
A CAT III 600V-rated tester is not rated for medium-voltage applications like 4,160V systems, where a higher category and voltage rating tool is required.