CEP Safety Standards & Compliance 2 — Questions and Answers
Question 1: Under OSHA 29 CFR 1910.147, what is the minimum energy control procedure requirement before servicing energized electrical equipment?
- Notify a supervisor and proceed
- Apply lockout/tagout and verify zero energy state (Correct answer)
- Use insulated tools only
- Post a warning sign near the equipment
Correct answer: Apply lockout/tagout and verify zero energy state
OSHA 1910.147 requires authorized employees to isolate equipment, apply lockout/tagout devices, and verify zero energy state before servicing.
Question 2: According to NFPA 70E, which PPE category is required when the incident energy exposure is between 4 and 8 cal/cm²?
- PPE Category 1
- PPE Category 2 (Correct answer)
- PPE Category 3
- PPE Category 4
Correct answer: PPE Category 2
NFPA 70E PPE Category 2 applies when incident energy exposure is between 4 and 8 cal/cm², requiring an arc rating of at least 8 cal/cm².
Question 3: What does the NEC Article 110.26 specify regarding working space in front of electrical equipment rated 600V or less?
- Minimum 18 inches of depth
- Minimum 30 inches of width and depth based on voltage class (Correct answer)
- No specific requirement if equipment is labeled
- At least 6 feet of vertical clearance only
Correct answer: Minimum 30 inches of width and depth based on voltage class
NEC 110.26 requires a minimum 30-inch width and a depth (condition-based) of 3 to 4 feet for working space in front of equipment 600V or less.
Question 4: Which standard governs the installation of grounding electrode systems for electrical services in the United States?
- NFPA 70E Article 130
- IEEE 80
- NEC Article 250 (Correct answer)
- OSHA 1910.303
Correct answer: NEC Article 250
NEC Article 250 covers all requirements for grounding and bonding, including grounding electrode systems for electrical services.
Question 5: A qualified electrical worker must establish an electrically safe work condition before entering a restricted approach boundary. What is the FIRST step in this process?
- Don appropriate PPE
- Identify all sources of electrical energy (Correct answer)
- Apply lockout/tagout devices
- Test with a voltage detector
Correct answer: Identify all sources of electrical energy
NFPA 70E requires that all sources of electrical energy to the equipment be identified before any other steps are taken to establish an electrically safe work condition.
Question 6: Per NEC 230.70, where must the service disconnecting means be located?
- Inside the main electrical panel only
- At or near the point of entrance of service conductors (Correct answer)
- At least 10 feet from the service drop
- At the utility meter location
Correct answer: At or near the point of entrance of service conductors
NEC 230.70 requires the service disconnecting means to be installed at a readily accessible location either outside or inside nearest the point where the service conductors enter.
Question 7: Which of the following is a key requirement of NFPA 70E for an energized electrical work permit?
- It must be signed only by a licensed electrician
- It must document the justification, hazards, PPE required, and safety procedures (Correct answer)
- It is only required for voltages above 480V
- It must be renewed every 30 days regardless of task completion
Correct answer: It must document the justification, hazards, PPE required, and safety procedures
An energized electrical work permit must document why energized work is necessary, the hazards, required PPE, and the safety procedures to be followed.
CEP Safety Standards & Compliance 2
Under OSHA 29 CFR 1910.147, what is the minimum energy control procedure requirement before servicing energized electrical equipment?