Electrician practice questions and answers 2026. Tap an option to test yourself — you'll see the correct answer and a plain-English explanation for every question. Free, no login.
Q11The ampacity of conductors that connect a capacitor to the terminals of a motor or to motor circuit conductors shall not be less than<code>________</code> the ampacity of the motor circuit conductors and not less than <code>________</code> % of the rated current of capacitors
✓ Correct answer: C. One third, 135%
Please Refer: NEC Code 460.8.
Q12Which of these fixture wires may be used in an operating temperature of 180°C?
✓ Correct answer: D. SF-1
NEC Table 402.3 specifies maximum operating temperatures for fixture wire materials. SF-1 is usable to 200°C. TFFN is usable up to 90°C. HFF and PGFF are usable up to 150°C.
Q13Splices and taps are permitted in a metal wireway provided they are accessible and do not fill the wireway to more than <code>________</code> of its area at that point.
✓ Correct answer: C. 75 percent
As per Section 376.56, splices and taps are permitted within a wireway, provided they are accessible. The splices and taps shall not fill the wireway to more than 75 percent at that point. Conductors in wireways can be accessed through hinged or removable covers.
Q14Where track lighting is installed in a continuous row, each individual section of not more than <code>________</code> in length shall be securely supported.
✓ Correct answer: C. 4 feet
As per Section 410.154, where lighting track is installed in a continuous row, each section must be supported at least every 4 ft. to adequately support the lighting track and the weight of the luminaires that can be installed.
Q15An enclosure for an overcurrent device is 8 inches wide and 5 inches deep. The maximum allowable wiring space for conductors, splices, and taps at any cross-section of the enclosure is <code>________</code>.
✓ Correct answer: D. 30 in<sup>2</sup>
NEC 312.8 discusses wiring space within switch and overcurrent device enclosures. 312.8(A) says that the area for conductors, splices, and taps at any cross-section can be no more than 75% of the cross-sectional area of an enclosure for overcurrent devices. This translates to 75% of (8 × 5) = 0.75 × 40 = 30 in<sup>2</sup>. <br/><br/>Choice A represents 40% of the cross-sectional area. <br/><br/>Choice B represents 50%. <br/><br/>Choice D represents 90%.
Q16Unless specifically identified for a higher percentage of fill, the cross-sectional area of the conductors or optical fiber tubes in a conduit seal, in Class I, Divisions 1 and 2 locations, shall not exceed <code>________</code> of the cross-sectional area of a rigid metal conduit (RMC) of the same trade size.
✓ Correct answer: D. 25 percent
The intent of Section 501.15(C)(6) is to minimize the passage of gases from one portion of the electrical system to another and to ensure an adequate area is available for pouring the sealing compound. As per Table 1, Chapter 9, the maximum permitted fill area for conduit is 40%; the maximum fill area permitted for standard conduit seals is 25%. If the conduit fill exceeds 25% of the cross-sectional area of the sealing fitting, a larger trade size sealing fitting is required.
Q17Conduit or tubing nipples not over 24 inches in length may be filled to a maximum of <code>________</code> of their cross-sectional area.
✓ Correct answer: C. 60 percent
Chapter 9, Informational Note Number 4 to the tables allows a permitted conduit or tubing fill of 60% of their cross-sectional area where the conduit or tubing is not more than 24 inches in length. This is permitted because short sections of the raceways readily permit easy pulling of the conductors and abrasion will not likely occur.
Q18When conductors are installed in a conduit or tubing nipple of <code>________</code> or less in length, the ampacity adjustment factors for more than three (3) current-carrying conductors in the raceway are not required to be applied.
✓ Correct answer: D. 24 inches
Section 310.15(C)(1)(b) clarifies that adjustment factors for more than three (3) current-carrying conductors in raceways shall not apply where the raceway is not more than 24 inches in length. <br/><br/>Where more than 3 current-carrying conductors are installed in short lengths of conduit or tubing, the heating effect caused from the additional conductors is insignificant. <br/><br/>Therefore, the ampacity of the conductors is not greatly reduced.
Q19At buildings where communications systems are likely to be used, an intersystem bonding termination shall be provided for the communications systems at an accessible location at the service equipment.<br/><br/>It shall be an aluminum or copper busbar not less than ¼ in. thick x 2 in. wide and be of sufficient length to accommodate not less than <code>________</code> terminations for communications systems in addition to other connections.
✓ Correct answer: D. three
According to Article 100 - Definitions, an intersystem bonding termination is a dedicated location that provides a means to connect communications systems (telephone cable, coaxial cable, satellite dishes, and antennas) to the building grounding electrode system.<br/><br/>The intersystem bonding termination device minimizes damage from induced voltage differences between the systems in the event of lightning occurring or a ground-fault. This bonding termination provides the communications installer an accessible location to bond the systems together without the need to open and work on energized equipment.<br/><br/>Section 250.94(A)(2) tells us that at least three (3) terminations are to be provided for the communications systems.
Q20Recessed or surface-mounted luminaires and recessed exhaust fans may be located within 8 ft from vertically from the top of a bathtub rim:
✓ Correct answer: A. True
Please Refer: NEC Code 410.10(D).
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