NWSA Electrical Safety and Grounding 1 — Questions and Answers
Question 1: What is the minimum safe approach distance for unqualified workers near energized overhead power lines rated up to 50kV?
- 3 feet
- 10 feet (Correct answer)
- 15 feet
- 20 feet
Correct answer: 10 feet
OSHA 1926.1408 requires unqualified workers to stay at least 10 feet away from energized overhead lines rated up to 50kV.
Question 2: Which OSHA construction standard specifically covers general electrical safety requirements for construction workers?
- 1910.147
- 1910.269
- 1926.503
- 1926.416 (Correct answer)
Correct answer: 1926.416
OSHA 1926.416 establishes the general electrical safety requirements applicable to workers in the construction industry.
Question 3: What color identifies the equipment grounding conductor in standard US electrical wiring?
- Green or bare copper (Correct answer)
- White or gray
- Black
- Red
Correct answer: Green or bare copper
US wiring standards identify the equipment grounding conductor by green insulation or bare (uninsulated) copper.
Question 4: GFCI protection on construction sites is required for which type of power?
- All permanent wiring only
- Only 240-volt circuits
- Temporary power distribution and portable electric tools (Correct answer)
- Fixed interior receptacles only
Correct answer: Temporary power distribution and portable electric tools
OSHA requires GFCI protection for all 120-volt, single-phase temporary power outlets and portable electric tools used at construction sites.
Question 5: The primary purpose of electrically bonding two metallic tower components together is to:
- Increase RF signal strength
- Reduce metal corrosion over time
- Improve structural load capacity
- Equalize electrical potential and prevent arcing or shock (Correct answer)
Correct answer: Equalize electrical potential and prevent arcing or shock
Bonding eliminates voltage differences between metallic components, preventing dangerous arcing, sparking, or electric shock hazards.
Question 6: Static electricity buildup on a tower structure poses which primary hazard to workers?
- Shock or ignition of flammable materials upon discharge (Correct answer)
- Accelerated corrosion of structural bolts
- Degradation of RF signal quality
- Long-term structural fatigue
Correct answer: Shock or ignition of flammable materials upon discharge
Accumulated static charge can discharge suddenly, delivering a shock to workers or igniting nearby flammable vapors and fuels.
NWSA Electrical Safety and Grounding 1
What is the minimum safe approach distance for unqualified workers near energized overhead power lines rated up to 50kV?