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The NJ-EC exam has 100 questions and runs 4 hours 15 minutes.
These 10 free NJ-EC questions are organized by exam domain, so you can see how each part of the New Jersey Electrical Contractor License Exam blueprint is tested. Reveal the answer and explanation under each question.
A new dwelling kitchen has a 120-V, 20-A individual branch circuit for a refrigerator. Its receptacle is 9 ft from the sink and does not serve a countertop. The circuit already has AFCI protection. The installer proposes omitting GFCI protection to avoid loss of refrigerated food. Under the 2023 NEC, what protection must this circuit provide?
Correct answer: B - Both AFCI and GFCI; the kitchen GFCI requirement is not limited to countertop receptacles.
A feeder conductor must carry a 43-A noncontinuous load. It shares a long raceway with seven other current-carrying conductors at an ambient temperature of 40°C. Copper THHN conductors and 75°C-rated terminations are specified. Table 310.16 ampacities at 75°C/90°C are: 8 AWG, 50/55 A; 6 AWG, 65/75 A; 4 AWG, 85/95 A; and 3 AWG, 100/115 A. The conductor-count adjustment factor is 0.70, and the ambient correction factor for 90°C insulation is 0.91. What is the smallest listed size with adequate ampacity?
Correct answer: B - 6 AWG copper
A new detached workshop receives a 120/240-V feeder with two ungrounded conductors, an insulated neutral, and a wire-type equipment grounding conductor. The feeder grounding conductor and the building's grounding electrode conductor terminate on a grounding bar bonded to the panelboard enclosure. The neutral bar is also bonded to the enclosure. Which correction is required?
Correct answer: C - Remove the neutral-to-enclosure bond; keep the feeder grounding and grounding electrode connections intact.
The classification drawing for a process area specifies Class I, Division 2, Group D. The documented ignition temperature of the vapor is 190°C. Four luminaires are otherwise suitable for the supply voltage and ambient conditions; their hazardous-location approvals are limited to the markings shown. Which luminaire is acceptable for this location?
Correct answer: D - Class I, Division 2, Group D, T4: maximum surface temperature 135°C.
A continuous-duty motor is marked 15 hp, 460 V, three-phase, 18.0 A, service factor 1.0, and temperature rise 35°C. NEC Table 430.250 lists 21 A for this horsepower and voltage. The starter uses a separate current-actuated overload device. Before any allowance for starting difficulty, what maximum overload trip current does the NEC permit?
Correct answer: C - 22.5 A
On a commercial tenant fit-out, the engineer answers a request for information by approving a revised conduit route that adds labor and materials. The contract gives the engineer technical-review authority but reserves price and time changes to the owner's written authorization. The reroute is not urgent, and other contracted work can proceed. How should the contractor handle the extra work?
Correct answer: B - Continue unchanged work; obtain the owner's written approval for added scope, price, and time.
An intrusion panel's instructions specify 2.2 kΩ for a secure zone, 4.4 kΩ for alarm, and an open or short circuit for tamper. An enabled zone stays secure when its door opens. It remains secure after both field wires are disconnected from the panel. Removing a separate resistor bridging the panel's zone terminals then produces an open-circuit tamper. What explains all three observations?
Correct answer: D - An end-of-line resistor at the panel is masking the field circuit.
At a weekly project review, an electrical contractor's earned-value report shows a cost performance index (CPI) of 0.84 and a schedule performance index (SPI) of 1.12. The project manager asks what these indices say about performance to date. Which interpretation is justified?
Correct answer: C - Earned progress is ahead of plan, but costs exceed the budgeted value of completed work.
A permanently connected power-limited fire alarm control unit in a commercial building has a dedicated, correctly identified branch circuit. Its breaker has the proper rating, and the branch-circuit wiring complies with the installation requirements. The owner requests a dual-function GFCI/AFCI breaker as an added safety measure. Which instruction follows the 2023 NEC requirements for this supply?
Correct answer: A - Retain the dedicated branch circuit with neither GFCI nor AFCI protection.
An estimator has included $48,000 in job costs for a feeder replacement, but a required $6,000 access-lift rental was left out. Together, these amounts cover all costs charged to the job, with no profit included. The company's pricing target is a 25% gross margin on the selling price. After correcting the omission, which bid meets that target?
Correct answer: D - $72,000
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