CME Safety and Emergency Procedures 3 — Questions and Answers
Question 1: An electrician discovers a coworker unresponsive after contact with a live panel. The scene is confirmed safe. What is the correct sequence of actions?
- Call 911, check responsiveness, begin CPR if needed, use AED if available (Correct answer)
- Begin CPR immediately, then call 911 after two minutes
- Use AED first, then call 911, then begin CPR
- Wait for EMS before touching the victim to avoid liability
Correct answer: Call 911, check responsiveness, begin CPR if needed, use AED if available
The correct chain of survival is: call 911, assess the victim, begin CPR if needed, and deploy an AED as soon as possible.
Question 2: Under NFPA 70E, what document must be generated before any electrical work begins on equipment that cannot be de-energized?
- A job hazard analysis (JHA) filed with OSHA
- An energized electrical work permit signed by management (Correct answer)
- A hot work permit from the fire marshal
- A lockout/tagout authorization from the safety director
Correct answer: An energized electrical work permit signed by management
NFPA 70E requires an energized electrical work permit, signed by an authorized management representative, before energized work proceeds.
Question 3: What is the purpose of an equipotential bonding grid on a livestock farm electrical installation?
- To reduce neutral-to-earth voltage that can harm animals and personnel (Correct answer)
- To increase the ground fault trip speed of the main breaker
- To provide a second grounding electrode for lightning protection
- To balance three-phase loads across the service entrance
Correct answer: To reduce neutral-to-earth voltage that can harm animals and personnel
Equipotential bonding grids equalize potential across areas where animals or people stand, eliminating dangerous step-and-touch voltage differences.
Question 4: OSHA 1926.416 requires that before electrical work begins, the qualified person must determine the nominal voltage of exposed live parts. What minimum insulated tool rating is required for work on systems up to 1,000V?
- 500V rated
- 1,000V rated (Correct answer)
- 1,500V rated
- 2,000V rated
Correct answer: 1,000V rated
Insulated tools used on systems up to 1,000V must be rated for at least 1,000V per OSHA construction electrical safety requirements.
Question 5: Which NFPA 70E arc flash PPE category requires a minimum arc rating of 40 cal/cm²?
- Category 1
- Category 2
- Category 3
- Category 4 (Correct answer)
Correct answer: Category 4
NFPA 70E PPE Category 4 requires a minimum arc rating of 40 cal/cm² for all PPE components.
Question 6: A 480V motor control center is being serviced. The qualified electrician must maintain what minimum distance for the restricted approach boundary?
- Avoid contact (1 inch) (Correct answer)
- Restricted boundary = 1 ft 0 in
- Restricted boundary = 2 ft 2 in
- Restricted boundary = 3 ft 6 in
Correct answer: Avoid contact (1 inch)
Per NFPA 70E Table 130.4(D)(a), for 151–750V systems, the restricted approach boundary is 'avoid contact' (essentially 0 inches clearance).
Question 7: Which type of injury accounts for the majority of electrical fatalities in the US construction industry according to OSHA statistics?
- Arc flash burns
- Electrocution from contact with energized conductors (Correct answer)
- Falls caused by electrical shock
- Explosions from arcing faults
Correct answer: Electrocution from contact with energized conductors
Direct electrocution from contact with energized conductors is the leading cause of electrical fatalities in US construction.
CME Safety and Emergency Procedures 3
An electrician discovers a coworker unresponsive after contact with a live panel.
The scene is confirmed safe.
What is the correct sequence of actions?