North Carolina Electrical Contractor - Single-Family Detached Residential Dwelling (SP-SFD) Practice Exam
Free Practice Exam
Test your knowledge with 10 questions from our pool of 20 free questions.
- 10 questions per attempt
- 30 minute time limit
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Full Practice Exam
Complete exam simulation matching the real PSI test format.
- 40 questions (same as real exam)
- 180 minute time limit
- 11 topic areas covered
- 196 questions in pool
- Detailed explanations
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North Carolina Electrical Contractor - Single-Family Detached Residential Dwelling (SP-SFD) Practice Exam Guide
What's on the exam
Questions per topic, out of 40This practice exam follows the official content outline for the North Carolina Electrical Contractor - Single-Family Detached Residential Dwelling (SP-SFD) exam: Bonding and Grounding, Overcurrent Protection, Wiring Methods and Terminations, Boxes and Fittings, Service Entrance and Equipment, Motors and Control Wiring, Special Occupancies and Hazardous Locations, Load Calculations, Appliances, Equipment, and Lighting, General, Laws, Rules, Basic Business Practices, and Practical Applications.
You can practice two ways. The free practice exam gives you 10 questions per attempt, and you can retake it whenever you like. The full practice exam gives you 40 questions on a 3 hours clock, with a new draw from our question bank each attempt.
Bonding and Grounding 5 items
The outline lists: Systems and equipment requiring grounding and ground-fault protection; Location of connection and required interconnections; Conductor identification and color coding; Bonding jumpers; Grounding electrode conductors; Equipment grounding conductors; Grounding electrodes; Low-voltage specifications.
Overcurrent Protection 4 items
The outline lists: Location in circuit; Sizing requirements; Circuit breakers; Plug and cartridge fuses; Enclosures and locations.
Wiring Methods and Terminations 3 items
The outline lists: Permitted applications and usages; Characteristics; Conduit and wireway fill; Permitted applications and usages; Characteristics; Protection from damage; Permitted usages and ampacity ratings; Characteristics.
Boxes and Fittings 4 items
The outline lists: General information; Sizing requirements.
Service Entrance and Equipment 4 items
The outline lists: Installation requirements; Service equipment; General sizing requirements.
Motors and Control Wiring 2 items
The outline lists: General information; Branch circuit and feeder ampacity; Overload protection; Short-circuit and ground-fault protection; Disconnects/controllers; Size; Type; Location.
Special Occupancies and Hazardous Locations 1 item
The outline lists: Mobile homes and mobile home parks; Swimming pools; Underwater lighting fixtures.
Load Calculations 4 items
The outline lists: Branch circuits; Total computed load; Conductor ampacity requirements; Low-voltage.
Appliances, Equipment, and Lighting 3 items
The outline lists: Air conditioners; Residential, commercial, and industrial equipment; Lighting fixtures; Space heating equipment and boilers; Transformers.
General 2 items
The outline lists: Definitions; Installation requirements.
Laws, Rules, Basic Business Practices, and Practical Applications 8 items
The outline lists: Electrical Contractors Licensing Law (General Statutes Chapter 87, Article 4); Board’s Rules for the Implementation of the Electrical Contractors Licensing Law (Title 21, North Carolina Administrative Code, Chapter 18B); NASCLA Contractors’ Guide to Business, Law and Project Management - North Carolina Electrical Edition; National Fire Alarm Code.
Sample 1 — Laws, Rules, Basic Business Practices, and Practical Applications
Question: You applied and paid the examination application fee, passed the Single-Family Detached Dwelling (SP-SFD) examination, and the Board has reviewed your score. What non-refundable license fee must you now pay for this special restricted classification?
- A. $150.00
- B. $200.00
- C. $100.00
- D. $90.00
Correct Answer: C
Per the NASCLA Contractors' Guide (NC Electrical Edition), Chapter 3, Licensing Application: the non-refundable license fees are Limited $100, Intermediate $150, Unlimited $200, and All Special Restricted (which includes SP-SFD) $100. The $90 figure is the Application for Examination fee, not the license fee.
Reference: NASCLA Contractors' Guide to Business, Law and Project Management - North Carolina Electrical Edition, Chapter 3 — Licensing Application section
Sample 2 — Bonding and Grounding
Question: For bonding of circuits operating at over 250 volts to ground, the electrical continuity of metal raceways and cables with metal sheaths shall be ensured by one or more of the methods specified for services, except for bonding to the ______.
- A. Equipment grounding conductor
- B. Grounded service conductor
- C. Grounding electrode
- D. Supply-side bonding jumper
Correct Answer: B
Per NEC 250.97, for circuits of over 250 volts to ground, the electrical continuity of metal raceways and cables with metal sheaths shall be ensured by one or more of the methods specified for services in 250.92(B), except for (B)(1) — which is the method of bonding equipment to the grounded service conductor. This exception exists because the grounded service conductor bonding method is specific to service equipment only.
Reference: NEC 2020 Section 250.97
Sample 3 — Overcurrent Protection
Question: You are mounting a load center in the utility room of a new dwelling. Measured to the center of the grip of the operating handle of the circuit breaker when the handle is in its highest position, what is the maximum permitted height above the floor or working platform?
- A. 7 ft 0 in.
- B. 6 ft 0 in.
- C. 5 ft 6 in.
- D. 6 ft 7 in.
Correct Answer: D
Per NEC 2020, Section 240.24(A), circuit breakers and switches containing fuses shall be readily accessible and installed so that the center of the grip of the operating handle, when in its highest position, is not more than 2.0 m (6 ft 7 in.) above the floor or working platform, subject to the listed exceptions.
Reference: NEC 2020 Section 240.24(A)
Your first attempt tells you where you're starting from. After every attempt, the results page shows your score for each outline topic, so you can see what to study next. Compare your score with the real exam's passing score, 70% correct, and keep going until you pass consistently.
- Answer the questions you know first, and bookmark the rest. Our practice exams let you bookmark and come back.
- Return to your bookmarks on the second pass.
- Keep a steady pace. The real exam works out to about 4 minutes 30 seconds per question.
- After each attempt, look up each missed question's reference and read the section.
| Questions | 40 questions |
| Time limit | 3 hours |
| Passing score | 70% correct |
| Books in the exam room | Open book |
| Exam fee | $125 |
- Results are given immediately at the test center, with a diagnostic report of strengths and weaknesses for candidates who do not pass.
- A candidate who fails must wait 3 months before retaking the same classification and must re-apply to the Board for each attempt.
Source: NCBEEC Examination Information Handbook (North Carolina Board of Examiners of Electrical Contractors), July 2026. Check the bulletin before test day: fees and rules can change.