NEC ELECTRIC 2 — Questions and Answers
Question 1: What is the minimum size copper conductor permitted for a branch circuit supplying general-purpose receptacles in a dwelling?
- 14 AWG (Correct answer)
- 12 AWG
- 10 AWG
- 16 AWG
Correct answer: 14 AWG
14 AWG copper is the minimum size for a 15-ampere general-purpose branch circuit.
Question 2: GFCI protection is required for receptacles installed in which of the following dwelling locations?
- Bedrooms
- Bathrooms (Correct answer)
- Hallways
- Living rooms
Correct answer: Bathrooms
Bathrooms require GFCI protection because of the presence of water.
Question 3: What is the standard color used to identify the grounded (neutral) conductor in a typical installation?
- Black
- Green
- White or gray (Correct answer)
- Red
Correct answer: White or gray
White or gray identifies the grounded neutral conductor.
Question 4: The minimum burial depth for a residential 120-volt circuit under a driveway using rigid metal conduit is generally:
- 6 inches (Correct answer)
- 12 inches
- 18 inches
- 24 inches
Correct answer: 6 inches
Rigid metal conduit may be buried at 6 inches under a residential driveway per NEC burial tables.
Question 5: Which device is designed to protect against arcing faults in dwelling bedroom circuits?
- GFCI
- AFCI (Correct answer)
- Surge protector
- Fuse
Correct answer: AFCI
AFCI (arc-fault circuit interrupter) protects against dangerous arcing faults.
Question 6: The ampacity of a conductor is primarily affected by all of the following EXCEPT:
- Insulation temperature rating
- Ambient temperature
- Conductor color (Correct answer)
- Number of current-carrying conductors
Correct answer: Conductor color
Conductor color is for identification only and does not affect ampacity.
Question 7: What is the maximum number of 12 AWG THHN conductors permitted in a single device box before box fill calculations are exceeded depends on:
- Conductor color
- Box volume in cubic inches (Correct answer)
- Circuit voltage
- Breaker amperage
Correct answer: Box volume in cubic inches
Box fill is calculated from the box's volume in cubic inches versus the volume allowance per conductor.
NEC ELECTRIC 2
What is the minimum size copper conductor permitted for a branch circuit supplying general-purpose receptacles in a dwelling?