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Residential Electrician Exam Questions Based on the National Electrical Code  
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The Residential Electrician Exam tests knowledge of the National Electrical Code (NEC) for residential wiring, safety, and calculations. It focuses on residential circuits, branch circuits, feeders, grounding, and services. Preparation includes practice exams, understanding blueprints, and reviewing NEC code updates, such as the 2023 or 2026 standards.  Key Aspects of the Exam: Code Focus: Based heavily on the National Electrical Code (NEC), with many states using recent versions like the 2023 or 2026 NEC. Content Areas: Covers residential electrical systems, including calculations, load... Show more
Residential Electrician Exam Questions Based on the National Electrical Code  
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25 Questions

1. A 120/208v 3-phase panel with exposed live parts on one side, and no live or grounded parts on the other side of the working space, must have a minimum clear working distance of _______ in front of the panel. [T110.26(A)(1)]
2. Snap switches rated 20-amperes or less directly connected to aluminum conductors shall be listed and marked ____. [404.14(C)]
3. Feeder conductors shall be tapped, without overcurrent protection at the tap if: [240.21(B)(1)(2)]
4. In a bathroom where receptacles are installed within 6 feet from the ____ edge of the bowl of a sink, they must be GFCI protected. 210.8(A)(7)
5. Receptacle outlets in or on floors shall not be counted as part of the required number of receptacle outlets unless located within how many inches of the wall? [210.52(A)(3)]
6. At all points where the armor of ________ terminates, a fitting shall be provided to protect wires from abrasion, unless the design of the outlet boxes or fittings is such as to afford equal protection, and in addition, an insulating bushing or its equivalent protection shall be provided between the conductors and the armor? [320.40]
7. An insulated grounded conductor of 4 AWG or larger shall be identified by which one of the following means: [200.6 (B)(1)]
8. The total rating of utilization equipment fastened in place, other than luminaires, shall ________ of the branch-circuit ampere rating where lighting units, cord-and-plugconnected utilization equipment not fastened in place, or both, are also supplied. [210.23(A)(2)]
9. What is the allowable ampacity for a flexible Type-SO cord with 3 current-carrying conductors? [T400.5(A)(1)]
10. An enclosure designed for surface mounting that has swinging doors or covers secured directly to and telescoping with the walls of the enclosure is: [Article 100]
11. The branch-circuit rating for an appliance that is a continuous load, other than a motoroperated appliance, shall not be less than ________ of the marked rating, or not less than ________ of the marked rating if the branch-circuit device and its assembly are listed for continuous loading at 100% of its rating. [422.10(A)]
12. It is appropriate to use the “optional feeder and service load calculation' method to a dwelling unit having the total connected load served by a ____ or ____ set of 3 wire service or feeder conductors with an ampacity of 100 amps or greater. [220.82]
13. Feeder conductors shall be tapped, without overcurrent protection at the tap if: [240.21(B)(1)(2)]
14. Any insulated cable 0-750 volts to ground, supported on and cabled together with a solidly grounded bare messenger or solidly grounded neutral conductor must maintain a clearance of ____ feet in any direction from the water level, edge of water surface, base of diving platform, or permanently anchored raft. [T680.9(A)]
15. In a trench below 2 in thick concrete or equivalent, conductors installed in Ridgid Metal Conduit must be buried below a minimum of __________: [T300.5]
16. Multi-wire branch circuits shall supply only ___________________. [210.4(c)]
17. Overhead conductors for festoon lighting shall not be smaller than 12 AWG unless the conductors are: [225.6 (B)]
18. Heat-resistant thermoplastic insulation covering 8 AWG conductors are listed for use in ________ and ______ locations? [T310.104(A)]
19. Screws used for the purpose of attaching receptacles to a box shall be of the type provided with a listed receptacle, or shall be machine screws having __________ or part of listed assemblies or systems, in accordance with the manufacturer’s instructions. [406.5]
20. What is the minimum clearance parameter for an open overhead 240-volt feeder travelling over a pool, from the surface of the water? [T680.9(A)]
21. All pull boxes, junction boxes, and conduit bodies shall be provided with covers compatible with the box or conduit body construction and suitable for the conditions of use. Where used, metal covers shall: [314.28 (C)]
22. What is the maximum allowed 1/0 AWG THHN conductors can fit in a 1 1/2' EMT conduit? [Ch. 9 Table 1]
23. The ampacity of UF cable shall be that of: [T310.15(B)(16)]
24. For devices with screw shells, the terminal for the ____ conductor shall be connected to the screw shell. [200.10(C)]
25. Exposed live parts on one side of the working space and grounded parts on the other side of the working space must have ____ of clearance in a 277-volt to ground environment. [T110.26(A)(1)]

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