Neiep 400 Ultimate Exam Prep - Verified Answers And Questions - Most Recent Edition 2026

NEIEP 400 ULTIMATE EXAM PREP - VERIFIED ANSWERS AND
QUESTIONS - MOST RECENT EDITION 2026




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National Electrical Code (NEC) Fundamentals
1. What is the primary purpose of the National Electrical Code?
ANSWER : To provide practical safeguarding of persons and
property from hazards arising from the use of electricity
2. How often is the NEC updated?
ANSWER : Every three years
3. What does Article 90 of the NEC cover?
ANSWER : Introduction and scope of the Code
4. What is the minimum burial depth for direct burial cable at 120V or
less?
ANSWER : 12 inches
5. What is the minimum burial depth for rigid metal conduit?
ANSWER : 6 inches
6. What does GFCI stand for?
ANSWER : Ground Fault Circuit Interrupter
7. At what current level does a GFCI typically trip?
ANSWER : 5 milliamps (mA)
8. What is the maximum spacing for receptacles in a dwelling?
ANSWER : 12 feet along the wall or 6 feet from any point
9. What is the minimum height for receptacles above a countertop?
ANSWER : Not to exceed 20 inches
10. What color wire is used for grounding?
ANSWER : Green or bare copper

,11. What color is typically used for the neutral conductor?
ANSWER : White or gray
12. What is the standard voltage for residential service in the US?
ANSWER : 120/240 volts
13. What is the minimum clearance above a driveway for overhead
service conductors?
ANSWER : 12 feet
14. What is the minimum height for a service mast?
ANSWER : 10 feet above finished grade
15. What size copper conductor is required for a 100-amp service?
ANSWER : #4 AWG copper or #2 AWG aluminum
16. What is the ampacity of #12 AWG copper wire at 60°C?
ANSWER : 20 amperes
17. What is the ampacity of #10 AWG copper wire at 60°C?
ANSWER : 30 amperes
18. What is the maximum number of #12 THHN wires in 1/2-inch EMT?
ANSWER : 9 conductors
19. What does EMT stand for?
ANSWER : Electrical Metallic Tubing
20. What does IMC stand for?
ANSWER : Intermediate Metal Conduit
21. What is the minimum wire size for general lighting circuits?
ANSWER : #14 AWG
22. What is the maximum continuous load on a 20-amp circuit?
ANSWER : 16 amperes (80% of rating)
23. How many watts per square foot are required for general lighting
in a dwelling?
ANSWER : 3 watts per square foot
24. What is the minimum number of small appliance circuits required
in a kitchen?

, ANSWER : Two 20-ampere circuits
25. What is the minimum number of bathroom circuits required in a
dwelling?
ANSWER : One 20-ampere circuit

Wiring Methods and Materials
26. What is the minimum bending radius for 1/2-inch EMT?
ANSWER : 4 inches
27. What is the maximum distance between supports for 1/2-inch
EMT?
ANSWER : 10 feet
28. What is the maximum distance from a box to the first support for
EMT?
ANSWER : 3 feet
29. What type of cable is typically used for residential wiring?
ANSWER : NM-B (Non-Metallic sheathed cable, type B)
30. What does THHN stand for?
ANSWER : Thermoplastic High Heat-resistant Nylon-coated
31. What is the maximum temperature rating for THHN wire?
ANSWER : 90°C in dry locations, 75°C in wet locations
32. What is the maximum fill percentage for conduit with 1 conductor?
ANSWER : 53%
33. What is the maximum fill percentage for conduit with 2
conductors?
ANSWER : 31%
34. What is the maximum fill percentage for conduit with 3 or more
conductors?
ANSWER : 40%
35. What is the minimum depth for a junction box with NM cable?
ANSWER : 1/2 inch
36. What is the minimum spacing between parallel runs of conduit?