Exam-style questions for journeyman electrician prep, aligned to the 2023 National Electrical Code®. Every question below is cross-verified against the code text by working electricians, with the article reference to prove it.
Try ten. See where you stand.
A branch circuit supplies 20 A continuously and 8 A noncontinuously. The 100%-rated-assembly exception does not apply. Using the ordinary 210.20(A) load rule, and assuming all other equipment and conductor-protection requirements allow the selection, what is the minimum standard OCPD rating in Table 240.6(A)?
An electrician runs a stairwell light controlled from top and bottom using three-way switches. To comply with the Code, the switching contacts must make and break which conductor of the circuit?
A panelboard operating at 120 volts to ground is mounted on a concrete wall with no live or grounded parts on the opposite side of the working space (Condition 1). What minimum depth of clear working space is required in front of it?
A 400 A service has a single made ground rod as its only grounding electrode. That rod is the sole connection to earth. What is the largest copper GEC size the Code requires you to run to that rod?
A feeder is made up of conductors with an allowable ampacity of 115 A. The circuit does not supply receptacles for cord-and-plug portable loads, and 115 A is not a standard device rating. Applying the next-higher-standard allowance, what is the largest overcurrent device permitted?
For one service using the multiple-disconnect arrangement permitted by 230.71(B), what is the maximum number of service disconnecting means in that arrangement?
A permanently installed pool at a dwelling unit requires at least one 125-volt, 15- or 20-ampere general-purpose receptacle. Measured from the inside wall of the pool, within what distance range must this required receptacle be located?
In a major repair garage for gasoline-fueled vehicles, repairs include draining gasoline from vehicle fuel tanks. The floor area lacks the ventilation that would allow it to be unclassified under Table 511.3(C). Considering the general floor area rather than a pit or an additional dispensing-location classification, how high does its Class I, Division 2 zone extend above the floor?
Six current-carrying conductors are installed in a single raceway for more than 24 in. What adjustment factor must be applied to their allowable ampacity per Table 310.15(C)(1)?
Where a cabinet or cutout box is used as a raceway (conductors feeding through with splices and taps), the conductors plus all splices and taps together must not fill more than what percentage of the cross-sectional area at that point?
The nine topic areas the exam draws from, and why code navigation beats memorization.
Ground rods, the 25-ohm rule, and the GEC sizing allowance that trips up oversizers.
Small-conductor caps, the next-size-up allowance, and the 125% continuous-load factor.
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