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.
Q21Which of the following is not required to be marked on the nameplate of a transformer?
✓ Correct answer: A. overcurrent protection
The information given on a transformer nameplate is necessary to determine the overcurrent protection, but the overcurrent protection value is not indicated on the nameplate.<br/><br/>Refer to Section 450.11(A).<br/><br/>The overcurrent protection is to be determined in accordance with the values given in Tables 430.3(A) and 430.3(B).
Q22Food waste disposer or dishwasher shall be connected to any of the required 20-ampere small appliance branch circuits in the kitchen.
✓ Correct answer: B. False
Please Refer: NEC Code 210.52(B).
Q23For health care facilities, which of the following branches are not permitted to be arranged for delayed automatic connection to the alternate power source?
✓ Correct answer: C. Exit signs
517.32, 517.35(A). Many equipment branches are required to be automatically connected to an alternate source of power. The branches in 517.35(A) shall be permitted to do so with a delay.<br/><br/>Exit signs must be arranged to have an automatic, non-delayed connection to an alternate source of power. This is most commonly done through an internal battery.
Q24Which term best describes the duty cycle of an appliance that, each hour, is on for 20 minutes at between 30% and 90% load, on for 20 minutes at no load, and off for 20 minutes?
✓ Correct answer: D. Periodic
NEC 100 defines each of the terms listed in the answer choices. <br/><br/>Duty, Periodic is "intermittent operation in which the load conditions are regularly recurrent." Even though the 20-minute load period varies in load, the variation (and the other 40 minutes) are "regularly recurrent." Duty, Short-time (choice B) is a substantially constant load, which does not describe a 30-90% range. <br/><br/>Duty, Continuous (choice C) is when the appliance is at a constant load for an indefinitely long time. <br/><br/>Duty, Varying (choice D) requires both the load and time interval to vary widely; though the load here can vary widely, the time interval does not.
Q25A homeowner wants a new pendant luminaire installed in the ceiling over the middle of a bathtub. The bottom of the luminaire must be at least:
✓ Correct answer: A. 8 feet above the top of the bathtub rim
NEC 410.10(D)(1), which discusses luminaire locations in bathtub and shower areas, requires all parts of a pendant luminaire to be at least 8 feet above the bathtub rim. The 3-foot requirement is for luminaires to be 3 feet horizontally from the top of the bathtub rim.
Q26Which of these generators is allowed to have live parts exposed to accidental contact where accessible to unqualified persons?
✓ Correct answer: B. 30 V ac
NEC 445 discusses generators, with 445.14 discussing protection of a generator's live parts.<br/><br/>Live parts can be exposed to accidental contact where accessible to unqualified persons if a generator is less than 50 volts ac or 60 volts dc.<br/><br/>Choices A, B, and C are larger than this.
Q27The minimum size of an aluminum TW conductor required for connecting to a 15-hp 500-V DC motor is <code>________</code> AWG.
✓ Correct answer: A. 8
NEC Table 430.247 specifies full-load current for DC motors of various horsepowers and armature voltage ratings.<br/><br/>Go down to the row for 15 horsepower and then go across to 500 volts to find the full-load current for this combination as 27 A.<br/><br/>NEC 430.22 requires conductors supplying a single motor in continuous duty to have an ampacity of at least 125% of the motor's full-load current rating, so the conductor must be rated for 27 × 1.25 = 33.8 A.<br/><br/>Now look at Table 310.16 to find the smallest aluminum TW conductor size with an ampacity of at least 33.8 A.<br/><br/>Go down the fourth column for aluminum size TW until you find 35 A, which corresponds to 8 AWG.<br/><br/>The other choices are larger conductor sizes than what is needed.<br/><br/>Ensure that you understand how the tables in this question are used together, as finding the minimum conductor size is a common exam problem.
Q28A driven ground rod or pipe electrode is required to be driven to a depth of at least<code>________</code> into the earth.
✓ Correct answer: D. 8 feet
To ensure an adequate grounding system and qualify as an effective grounding electrode, according to Section 250.53(A)(4), all rod and pipe electrodes have at least 8 ft. of length in contact with the soil.
Q29Where a grounding ring consist of size 2 AWG bare copper wire encircling a building, buried 36 inches, in direct contact with the earth, what is the minimum length of the wire permitted for the grounding electrode in this ground ring?
✓ Correct answer: A. 20 feet
To qualify as a grounding electrode, the size 2 AWG bare copper conductor is to be in one continuous 20 ft. length. Refer to Section 250.52(A)(4). This type of grounding method is commonly used in sandy areas, such as West Texas, Eastern New Mexico, Arizona, and Southern California.
Q30The minimum cover required for 600 V nominal rated directly buried cable under streets, highways, roads and alleys shall be <code>________</code>:
✓ Correct answer: A. 24 inches
Please Refer: NEC Code – Table 300.5.
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