CME Safety and Emergency Procedures 5

Question 1

What is the minimum depth of burial required by the NEC for direct-buried 120/240V residential service entrance cable (USE-2) with no additional protection?

Accepted Answer

24 inches

Answer

NEC Table 300.5 requires a minimum burial depth of 24 inches for direct-buried residential service entrance cables without supplemental protection.

Question 2

A worker receives a severe electrical burn on the hand. After calling 911, what is the correct first aid treatment?

Accepted Answer

Cover the burn loosely with a sterile non-stick bandage and keep the victim warm

Answer

Electrical burns should be covered loosely with a sterile dressing; ice, ointments, or breaking blisters can worsen the injury and increase infection risk.

Question 3

According to NFPA 70E, who is responsible for identifying, documenting, and labeling arc flash hazards on electrical equipment?

Accepted Answer

The building owner or their designated representative

Answer

NFPA 70E places responsibility for performing arc flash risk assessments and labeling equipment on the owner or operator of the electrical equipment.

Question 4

In an emergency where a worker's clothing catches fire from an arc flash, what is the correct immediate response?

Accepted Answer

The victim should stop, drop, and roll to smother the flames

Answer

Stop, drop, and roll is the universally recommended technique to smother flames on a person's clothing and body.

Question 5

Which OSHA standard specifically prohibits working on or near energized parts above 50 volts unless de-energizing creates a greater hazard or is infeasible due to equipment design or operational limitations?

Accepted Answer

29 CFR 1910.333(a)(1)

Answer

OSHA 29 CFR 1910.333(a)(1) establishes the de-energizing requirement for work on or near parts energized above 50V, with limited exceptions.

(CME) Certified Master Electrician Practice Test

(CME) Certified Master Electrician Practice Test

CME Safety and Emergency Procedures 5