CEI Electrical Code & Standards 3

Question 1

According to the NEC, what is the minimum burial depth for a rigid metal conduit (RMC) installed under a residential driveway?

Accepted Answer

12 inches

Answer

NEC Table 300.5 requires RMC to be buried at least 6 inches under a residential driveway, but under a street or road 24 inches is required; under driveways for dwellings 12 inches applies.

Question 2

Under the NEC, what minimum headroom is required in electrical equipment rooms containing service equipment rated 1200 amperes or more?

Accepted Answer

6 feet

Answer

NEC 110.26(E)(1)(a) requires a minimum headroom of 6 feet 3 inches for service equipment rooms, but 6 feet applies in specific lower-rated scenarios.

Question 3

What is the maximum number of overcurrent devices (excluding the main breaker) permitted in a lighting and appliance branch circuit panelboard?

Accepted Answer

42

Answer

NEC 408.15 limits lighting and appliance branch circuit panelboards to a maximum of 42 overcurrent devices.

Question 4

Which NEC section requires arc-fault circuit interrupter (AFCI) protection for dwelling unit bedroom circuits?

Accepted Answer

210.12

Answer

NEC 210.12 requires AFCI protection for branch circuits supplying outlets in dwelling unit bedrooms and many other areas.

Question 5

Under the NEC, luminaires installed in clothes closets must maintain a minimum clearance of how many inches from storage space when they are surface-mounted fluorescent types?

Accepted Answer

6 inches

Answer

NEC 410.16(C)(3) permits surface-mounted fluorescent luminaires in clothes closets with a minimum 6-inch clearance from the storage area.

(CEI) Certified Electrical Inspector Practice Test

(CEI) Certified Electrical Inspector Practice Test

CEI Electrical Code & Standards 3