CEI Cheat Sheet 2026

The 30 highest-yield CEI facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which of the following best describes a key competency required for commercial & industrial systems in CEI practice? → Strong analytical skills combined with effective communication and ethical judgment
2. During inspection, a motor nameplate indicates 'SF 1.15.' What does this service factor mean? → The motor is rated for continuous duty at 115% of its nameplate horsepower
3. Which NEC section addresses the requirement that service-entrance conductors must be protected against physical damage? → NEC 230.50
4. When inspecting a CT (current transformer) metering installation, why are instrument transformers used? → To reduce high current to a manageable level for meter measurement
5. Which safety gear is essential during inspections? → Gloves and safety glasses
6. Which of the following best describes a key competency required for renewable energy system inspection in CEI practice? → Strong analytical skills combined with effective communication and ethical judgment
7. What is the maximum distance allowed between a motor disconnect and the motor controller, according to NEC 430.102? → Within sight from the controller
8. Per NEC 215.2(A)(1), feeder conductor ampacity must be not less than which of the following? → 100% of non-continuous load plus 125% of continuous load
9. GFCI protection for all 125-volt, 15- and 20-ampere receptacles in bathrooms of dwelling units is required by NEC: → 210.8(A)(1)
10. What is the minimum wire gauge for household branch circuits? → 14 AWG
11. What is the minimum conductor size (AWG copper) required for a 30-ampere branch circuit per NEC Table 310.16? → 10 AWG
12. Which organization publishes the NEC? → NFPA
13. Per NEC 230.79(C), what is the minimum rating for the service disconnect for a single-family dwelling unit? → 100 amperes, 3-wire
14. Which tool is commonly used to detect electrical current? → Multimeter
15. In the context of CEI certification, what is the most important consideration when implementing code violation documentation? → Ensuring alignment with established standards, stakeholder needs, and best practices
16. Per NEC Article 100, an individual branch circuit is defined as one that: → Supplies only one piece of utilization equipment
17. What is the minimum individual branch circuit rating required for a household electric clothes dryer per NEC 220.54? → 30-ampere, 240-volt
18. When a feeder is tapped under the 25-foot tap rule (NEC 240.21(B)(2)), what is the minimum ampacity required for the tap conductor? → Not less than 1/3 the ampere rating of the feeder OCPD
19. When inspecting a motor disconnecting means, what is the minimum horsepower rating requirement for motors rated over 2 hp at 600V or less? → The disconnect must be rated at least equal to the motor's hp
20. During inspection, a residential 200A underground service is found using aluminum conductors. What is the minimum conductor size required? → 4/0 AWG aluminum
21. Why is personal protective equipment (PPE) important? → Reduce injury risk
22. In the context of CEI certification, what is the most important consideration when implementing renewable energy system inspection? → Ensuring alignment with established standards, stakeholder needs, and best practices
23. How often should electrical systems be inspected? → Regularly per code requirements
24. What is the role of documentation in inspections? → Record findings and approvals
25. What is the purpose of the main bonding jumper at the service equipment? → To connect the neutral conductor to the equipment grounding conductor
26. In the context of CEI certification, what is the most important consideration when implementing residential electrical inspection? → Ensuring alignment with established standards, stakeholder needs, and best practices
27. Which regulation governs workplace electrical safety? → OSHA
28. What must be done before beginning electrical inspections? → Verify power is off
29. What is the maximum overcurrent device rating permitted for a 15-ampere branch circuit per NEC 210.3? → 15 amperes
30. How should an inspector handle non-compliant installations? → Report and require correction