CCI CCI Electrical Systems Inspection 3

Question 1

Which of the following best describes arc-fault circuit interrupters (AFCIs) and where they are required?

Accepted Answer

AFCI breakers are required in most living areas of new residential construction per NEC

Answer

NEC now requires AFCI protection in virtually all living areas of new residential construction including bedrooms, living rooms, kitchens, and hallways.

Question 2

During electrical rough-in inspection, what is the minimum box fill volume required for a single 12 AWG conductor entering a box?

Accepted Answer

2.25 cubic inches

Answer

Per NEC Table 314.16(B), each 12 AWG conductor requires 2.25 cubic inches of box fill volume to prevent overheating and overcrowding.

Question 3

What is the inspection criterion for determining if a neutral conductor is properly sized for a feeder?

Accepted Answer

The neutral must be sized to carry the maximum unbalanced load from the line conductors

Answer

The neutral conductor must be sized to handle the maximum unbalanced load between phase conductors, which may be smaller than phase conductors in balanced three-phase systems.

Question 4

When should a construction inspector require an electrical permit and inspection for temporary power during construction?

Accepted Answer

Temporary power installations always require a permit and inspection like permanent installations

Answer

Temporary electrical installations for construction require permits and inspection under NEC Article 590 just as permanent installations do.

Question 5

What is the primary concern an inspector should have when observing aluminum wiring connections at outlets and switches?

Accepted Answer

Aluminum wire requires CO/ALR rated devices to prevent loose connections due to thermal expansion differences

Answer

Aluminum expands and contracts at a different rate than copper, requiring CO/ALR rated devices specifically designed for aluminum connections to prevent fire hazards.

(CCI) Certified Construction Inspector Practice Test

(CCI) Certified Construction Inspector Practice Test

CCI CCI Electrical Systems Inspection 3