CEA Safety Standards & Regulations 2 — Questions and Answers
Question 1: Under OSHA 29 CFR 1910.303, what is the minimum working space clearance in front of electrical equipment rated 0–150 volts to ground?
- 2 feet
- 3 feet (Correct answer)
- 4 feet
- 6 feet
Correct answer: 3 feet
OSHA requires a minimum of 3 feet of working space in front of electrical equipment for voltages 0–150V to ground (Condition 1).
Question 2: Which NFPA standard specifically governs electrical safety in the workplace?
- NFPA 70
- NFPA 70E (Correct answer)
- NFPA 101
- NFPA 72
Correct answer: NFPA 70E
NFPA 70E is the Standard for Electrical Safety in the Workplace, covering arc flash, PPE, and safe work practices.
Question 3: What does an Energized Electrical Work Permit require before beginning work on live circuits?
- Only a verbal approval from the supervisor
- Written justification, hazard analysis, and signatures from qualified persons (Correct answer)
- A standard lock tag only
- Just PPE selection documentation
Correct answer: Written justification, hazard analysis, and signatures from qualified persons
NFPA 70E requires an Energized Electrical Work Permit to include written justification, shock/arc flash hazard analysis, required PPE, and approval signatures.
Question 4: Which color is OSHA-designated to indicate caution or a potential hazard on safety signs?
- Red
- Orange
- Yellow (Correct answer)
- Green
Correct answer: Yellow
OSHA designates yellow as the standard caution color, warning workers of potential hazards that are not immediately life-threatening.
Question 5: When must an apprentice electrician report a workplace electrical hazard under OSHA regulations?
- Only if the hazard causes an injury
- At the end of the workday
- Immediately upon discovery (Correct answer)
- Only if a supervisor requests a report
Correct answer: Immediately upon discovery
OSHA requires workers to report hazards immediately so corrective action can be taken before an injury occurs.
Question 6: What is the purpose of an equipotential bonding zone when working near energized conductors?
- To create a low-resistance path for fault current to flow to ground
- To ensure all nearby conductive surfaces are at the same voltage potential, reducing shock risk (Correct answer)
- To prevent static buildup on tools
- To increase circuit resistance for arc flash protection
Correct answer: To ensure all nearby conductive surfaces are at the same voltage potential, reducing shock risk
An equipotential bonding zone equalizes voltage between conductive surfaces so no dangerous potential difference exists across a worker's body.
Question 7: Under NEC Article 110.26, headroom clearance above electrical equipment must be at least:
- 5.5 feet
- 6 feet
- 6.5 feet (Correct answer)
- 7 feet
Correct answer: 6.5 feet
NEC 110.26(E) requires a minimum headroom of 6.5 feet (2.0 m) above the working space in front of electrical equipment.
CEA Safety Standards & Regulations 2
Under OSHA 29 CFR 1910.303, what is the minimum working space clearance in front of electrical equipment rated 0–150 volts to ground?