Safety Standards and Practices Flashcards
7 cards from real E2 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Safety Standards and Practices flashcards as text
What is the minimum approach distance for qualified workers near energized 480V conductors without PPE barriers?
Answer: Restricted approach boundary
The restricted approach boundary defines the closest distance a qualified worker may approach energized conductors without additional protection measures.
Under OSHA 29 CFR 1910.333, de-energized electrical equipment must be locked out before work begins unless the employer can demonstrate that de-energizing would:
Answer: Cause a greater hazard or is infeasible due to equipment design
OSHA allows energized work only when de-energizing creates a greater hazard or is infeasible due to equipment design or operational limitations.
Which NFPA 70E hazard/risk category requires an arc flash suit with a minimum arc rating of 40 cal/cm²?
Answer: Category 4
NFPA 70E Category 4 (now referred to in the PPE table) requires a minimum arc rating of 40 cal/cm² for protection against higher-energy arc flash incidents.
When inspecting a commercial switchboard, an inspector notices an arc flash label that is over 5 years old. According to NFPA 70E, this label should be:
Answer: Updated through a new arc flash hazard analysis
NFPA 70E requires arc flash hazard analyses to be reviewed at intervals not to exceed 5 years, necessitating an updated label.
A commercial building's electrical panel room has a working space depth of 2.5 feet in front of a 480V switchboard. According to NEC 110.26, this is:
Answer: A violation; minimum depth is 3 feet for voltages 151–600V
NEC 110.26(A)(1) requires a minimum working space depth of 3 feet for systems 151–600V (Condition 1).
An E2 inspector observes that a 277V fluorescent lighting circuit has no GFCI protection in a commercial kitchen wet location. Which code section applies?
Answer: NEC 210.8(B) requires GFCI for 277V circuits in commercial wet locations
NEC 210.8(B) requires GFCI protection for personnel in commercial kitchens, including 277V circuits used in wet locations.
During a commercial inspection, an inspector finds that a contractor used aluminum conductors for branch circuits in a multi-family dwelling. What is the primary safety concern?
Answer: Aluminum can cause loose connections leading to overheating at terminals rated for copper only
Aluminum conductors connected to terminals rated only for copper (CU) can loosen over time due to thermal expansion differences, creating a fire hazard.