AIT Code Requirements 3 — Questions and Answers
Question 1: According to the NEC, which wire gauge is the minimum size permitted for a 20-ampere branch circuit?
- 14 AWG
- 12 AWG (Correct answer)
- 10 AWG
- 8 AWG
Correct answer: 12 AWG
NEC Article 210.19 requires a minimum of 12 AWG copper conductors for a 20-ampere branch circuit.
Question 2: What is the purpose of a 'variance' in the context of building codes and zoning regulations?
- A permit issued for hazardous work
- A legal exception allowing deviation from standard code requirements (Correct answer)
- An additional inspection required for complex projects
- A document listing all code violations found
Correct answer: A legal exception allowing deviation from standard code requirements
A variance grants legal permission to deviate from specific code or zoning requirements when strict compliance would cause undue hardship.
Question 3: Which NFPA standard specifically covers sprinkler systems for fire protection in buildings?
- NFPA 70
- NFPA 13 (Correct answer)
- NFPA 101
- NFPA 25
Correct answer: NFPA 13
NFPA 13 is the standard for the installation of automatic sprinkler systems.
Question 4: In construction, which code classification describes a building where the primary structure must be non-combustible?
- Type V construction
- Type I construction (Correct answer)
- Type III construction
- Type IV construction
Correct answer: Type I construction
Type I construction requires structural elements to be non-combustible and is the most fire-resistant classification.
Question 5: Under OSHA 29 CFR 1926, what is the minimum distance that a worker must maintain from an unguarded excavation edge?
- 2 feet (Correct answer)
- 4 feet
- 6 feet
- 10 feet
Correct answer: 2 feet
OSHA 1926.502 requires workers to stay at least 2 feet from the edge of an unprotected excavation.
Question 6: What is the primary purpose of the International Energy Conservation Code (IECC)?
- To regulate electrical panel sizing
- To set minimum energy efficiency standards for buildings (Correct answer)
- To govern renewable energy installations
- To define occupancy load calculations
Correct answer: To set minimum energy efficiency standards for buildings
The IECC establishes minimum energy efficiency requirements for the building envelope, mechanical, lighting, and service water heating systems.
Question 7: Under the NEC, what color is required for a grounding conductor (equipment ground) in a fixed wiring system?
- White or gray
- Green or bare (Correct answer)
- Black
- Red
Correct answer: Green or bare
NEC Article 250.119 requires equipment grounding conductors to be green, green with yellow stripe, or bare.
AIT Code Requirements 3
According to the NEC, which wire gauge is the minimum size permitted for a 20-ampere branch circuit?