PC Safety Practices & Risk Management 2 — Questions and Answers
Question 1: Which OSHA standard primarily governs electrical safety in general industry workplaces?
- 29 CFR 1910.333 (Correct answer)
- 29 CFR 1926.404
- 29 CFR 1910.145
- 29 CFR 1926.501
Correct answer: 29 CFR 1910.333
29 CFR 1910.333 covers electrical safety-related work practices in general industry settings.
Question 2: What is the minimum approach distance (MAD) used for in electrical safety?
- The distance a worker must maintain from exposed energized conductors (Correct answer)
- The length of insulated gloves required
- The spacing between circuit breakers in a panel
- The distance between a meter and the service entrance
Correct answer: The distance a worker must maintain from exposed energized conductors
MAD defines the closest a qualified worker can approach energized conductors based on system voltage.
Question 3: A job hazard analysis (JHA) is best described as:
- A formal study that identifies hazards associated with specific job tasks before work begins (Correct answer)
- A post-accident investigation report
- An OSHA inspection checklist
- A permit required before entering a confined space
Correct answer: A formal study that identifies hazards associated with specific job tasks before work begins
A JHA proactively identifies hazards associated with each step of a task so controls can be implemented beforehand.
Question 4: Which class of fire extinguisher is appropriate for energized electrical equipment fires?
- Class C (Correct answer)
- Class A
- Class B
- Class D
Correct answer: Class C
Class C extinguishers use non-conductive agents and are rated for fires involving energized electrical equipment.
Question 5: When using an insulated aerial lift near energized lines, workers must maintain a minimum clearance of how many feet from lines under 50 kV?
- 10 feet (Correct answer)
- 3 feet
- 6 feet
- 15 feet
Correct answer: 10 feet
OSHA 29 CFR 1910.333 and NFPA 70E require at least 10 feet of clearance from unguarded energized lines up to 50 kV.
Question 6: What does the term 'flash boundary' refer to in NFPA 70E?
- The distance at which an arc flash could cause a second-degree burn through unprotected skin (Correct answer)
- The point at which a circuit breaker trips during a fault
- The minimum working clearance from a live panel
- The boundary of a permit-required confined space
Correct answer: The distance at which an arc flash could cause a second-degree burn through unprotected skin
The arc flash boundary is the distance where incident energy equals 1.2 cal/cm², which can cause a just-curable second-degree burn.
Question 7: Which document must be completed before performing hot work (welding or cutting) near electrical installations?
- Hot work permit (Correct answer)
- LOTO authorization form
- Equipment grounding log
- Material safety data sheet
Correct answer: Hot work permit
A hot work permit documents the hazards, precautions, and approvals required before any welding or open-flame work begins.
PC Safety Practices & Risk Management 2
Which OSHA standard primarily governs electrical safety in general industry workplaces?