NSC NSC Electrical Safety 1 — Questions and Answers
Question 1: What is the minimum approach distance for an unqualified worker near exposed electrical parts operating at 50 volts or greater?
- At least 10 feet (Correct answer)
- At least 3 feet
- At least 6 feet
- At least 1 foot
Correct answer: At least 10 feet
OSHA 1910.333 requires unqualified workers to maintain at least a 10-foot distance from exposed energized electrical parts at 50 volts or greater.
Question 2: According to the NSC, which of the following is the most common cause of electrical injuries in the workplace?
- Contact with overhead power lines (Correct answer)
- Defective power tools
- Overloaded circuits
- Wet conditions near outlets
Correct answer: Contact with overhead power lines
Contact with overhead power lines is the leading cause of electrical fatalities in the workplace, particularly in construction.
Question 3: What does GFCI stand for in electrical safety?
- Ground Fault Circuit Interrupter (Correct answer)
- General Fault Current Indicator
- Ground Fault Compliance Inspection
- General Frequency Circuit Interrupter
Correct answer: Ground Fault Circuit Interrupter
GFCI stands for Ground Fault Circuit Interrupter, a device that shuts off power when it detects a ground fault to prevent electrocution.
Question 4: Which OSHA standard covers electrical safety requirements for general industry workplaces?
- 29 CFR 1910.303–1910.399 (Correct answer)
- 29 CFR 1910.147
- 29 CFR 1910.134
- 29 CFR 1910.119
Correct answer: 29 CFR 1910.303–1910.399
OSHA 29 CFR 1910.303–1910.399 covers electrical safety design and work practice requirements for general industry.
Question 5: What is the purpose of an Arc Flash Risk Assessment in the workplace?
- To identify the incident energy levels of electrical equipment and determine required PPE (Correct answer)
- To audit fire suppression systems near electrical panels
- To certify electricians for high-voltage work
- To document the age of electrical equipment in the facility
Correct answer: To identify the incident energy levels of electrical equipment and determine required PPE
An arc flash risk assessment determines the energy level of potential arc flash events and the appropriate PPE category required.
Question 6: Extension cords should NOT be used as a substitute for what in the workplace?
- Permanent wiring (Correct answer)
- Surge protectors
- Ground fault circuit interrupters
- Power strips
Correct answer: Permanent wiring
Extension cords are for temporary use only and must never replace permanent wiring, which is required for sustained electrical loads.
NSC NSC Electrical Safety 1
What is the minimum approach distance for an unqualified worker near exposed electrical parts operating at 50 volts or greater?