OSHA OSHA - Safety Certificate Electrical Safety Standards Questions and Answers 2 — Questions and Answers
Question 1: What is the minimum approach distance for an unqualified worker near exposed energized parts operating at 50 kV?
- 10 feet (Correct answer)
- 6 feet
- 20 feet
- 3 feet
Correct answer: 10 feet
OSHA 29 CFR 1926.416 requires unqualified workers to maintain at least 10 feet from overhead power lines energized at 50 kV or below.
Question 2: Under OSHA's Lockout/Tagout standard, what must be done BEFORE servicing equipment that has stored electrical energy in capacitors?
- The stored energy must be dissipated or restrained before servicing begins (Correct answer)
- A warning sign must be posted near the capacitors
- The circuit breaker must be switched off only
- The equipment must be unplugged and left for 24 hours
Correct answer: The stored energy must be dissipated or restrained before servicing begins
OSHA 29 CFR 1910.147 requires that all potentially hazardous stored energy, including charged capacitors, be relieved or restrained before any servicing work begins.
Question 3: Which OSHA standard specifically addresses electrical safety requirements for construction work?
- 29 CFR 1926 Subpart K (Correct answer)
- 29 CFR 1910 Subpart S
- 29 CFR 1926 Subpart P
- 29 CFR 1910 Subpart Z
Correct answer: 29 CFR 1926 Subpart K
29 CFR 1926 Subpart K covers electrical safety standards specifically applicable to construction industry workplaces.
Question 4: What color is the standard insulation for a grounding conductor according to OSHA and NEC requirements?
- Green or green with yellow stripes (Correct answer)
- White
- Black
- Red
Correct answer: Green or green with yellow stripes
OSHA and NEC standards require grounding conductors to be identified by green insulation or green with yellow stripes.
Question 5: According to OSHA, what is the primary purpose of Ground Fault Circuit Interrupters (GFCIs) on construction sites?
- To protect workers from electrocution caused by ground faults (Correct answer)
- To prevent equipment overloads
- To reduce electricity consumption
- To protect circuits from short circuits
Correct answer: To protect workers from electrocution caused by ground faults
GFCIs are required on construction sites primarily to protect employees from electrocution by detecting imbalances in current flow caused by ground faults.
Question 6: Under OSHA regulations, at what voltage level must employers implement electrical safety work practices for employees?
- 50 volts and above (Correct answer)
- 120 volts and above
- 240 volts and above
- Any voltage level
Correct answer: 50 volts and above
OSHA considers 50 volts as the threshold above which electrical energy poses a significant risk of injury, requiring safety work practices.
OSHA OSHA - Safety Certificate Electrical Safety Standards Questions and Answers 2
What is the minimum approach distance for an unqualified worker near exposed energized parts operating at 50 kV?