CCI CCI Electrical Systems Inspection 2 — Questions and Answers
Question 1: During an electrical inspection, what is the purpose of a load calculation?
- To determine if the service entrance capacity is adequate for the building's electrical demand (Correct answer)
- To calculate the number of outlets needed per room
- To verify wire gauge selection for individual circuits
- To check conduit fill percentages
Correct answer: To determine if the service entrance capacity is adequate for the building's electrical demand
Load calculations ensure the electrical service entrance has sufficient ampacity to safely supply all anticipated electrical loads in the building.
Question 2: What NEC article governs the installation of electrical wiring in hazardous locations?
- Article 500 (Correct answer)
- Article 300
- Article 230
- Article 410
Correct answer: Article 500
NEC Article 500 covers hazardous classified locations where flammable gases, vapors, or combustible dusts may be present.
Question 3: A CCI inspector notices a junction box is installed without a cover plate. What is the correct action?
- Require correction — all junction boxes must have accessible, secured cover plates (Correct answer)
- Allow it if the box is in an unfinished space
- Allow it temporarily during active construction phase
- Only require a cover if the box contains spliced conductors
Correct answer: Require correction — all junction boxes must have accessible, secured cover plates
The NEC requires all junction boxes to be covered with accessible cover plates at all times, regardless of location or stage of construction.
Question 4: What is the maximum conduit fill percentage allowed for three or more conductors per NEC Chapter 9?
- 40% (Correct answer)
- 53%
- 31%
- 60%
Correct answer: 40%
NEC Chapter 9 limits conduit fill to 40% of the conduit's cross-sectional area when three or more conductors are installed.
Question 5: When inspecting service entrance conductors, how must they be protected where they pass through the exterior wall?
- Installed in a weatherproof conduit or raceway approved for outdoor use (Correct answer)
- Wrapped with waterproof electrical tape
- Coated with sealant only
- No special protection is required for short wall penetrations
Correct answer: Installed in a weatherproof conduit or raceway approved for outdoor use
Service entrance conductors must be installed in weather-rated conduit or raceway through wall penetrations to prevent moisture intrusion and mechanical damage.
Question 6: What is the required depth of burial for direct-buried electrical cable (UF cable) under a residential driveway per NEC?
- 24 inches (Correct answer)
- 12 inches
- 18 inches
- 6 inches
Correct answer: 24 inches
NEC Table 300.5 requires direct-buried cables under driveways subject to vehicular traffic to be buried a minimum of 24 inches deep.
CCI CCI Electrical Systems Inspection 2
During an electrical inspection, what is the purpose of a load calculation?