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The Electrical Levels 1-4 exam has 103 questions and runs 3 hours.
These 10 free Electrical Levels 1-4 questions are organized by exam domain, so you can see how each part of the NCCER Electrical Levels 1-4 blueprint is tested. Reveal the answer and explanation under each question.
An electrician has shut down a conveyor, opened and isolated its disconnect, applied a personal lock and tag, and bled off the stored energy in the drive's capacitors. What must be done before any work begins on the equipment?
Correct answer: D - Verify the zero-energy state by testing the circuit
A 4 in. square box contains six 12 AWG conductors that enter the box and are spliced inside, two 12 AWG equipment grounding conductors, two internal cable clamps, and one duplex receptacle mounted on a yoke. What is the total conductor count for the box fill calculation?
Correct answer: B - 10 conductors
An electrician must offset a run of 1/2 in. EMT to clear a 4 in. obstruction using two 30° bends. What is the distance between the two bend marks?
Correct answer: C - 8 in.
During an inspection, an electrician points to an Informational Note in the NEC to justify an installation method. How must that Informational Note be treated?
Correct answer: A - As explanatory material that is not enforceable as a requirement
A 200 A service is supplied by 3/0 AWG copper service-entrance conductors. What is the minimum size copper grounding electrode conductor required?
Correct answer: C - 4 AWG
A 480 V, three-phase load draws 40 A at a power factor of 0.85. What is the true power delivered to the load?
Correct answer: B - 28.3 kW
A three-phase motor is running under load when one line fuse opens. What is the most likely immediate result?
Correct answer: A - The motor continues to run but draws excessive current on the remaining phases
A sump pump motor is controlled by a float switch wired directly into the magnetic starter's coil circuit. After a brief power outage, the motor restarts by itself with no one present. Which statement best explains this?
Correct answer: C - A two-wire control circuit provides no low-voltage protection
The available fault current at a panelboard is calculated at 18,000 A. Which branch-circuit breaker may be installed in that panelboard?
Correct answer: D - A breaker with a 22,000 A interrupting rating
Six current-carrying 8 AWG THWN-2 copper conductors are installed in a single raceway at an ambient temperature of 30°C. The circuit terminates on equipment rated 75°C. What ampacity may be used for these conductors?
Correct answer: B - 44 A
The Electrical Levels 1-4 exam also covers these domains. Drill them in the full free practice test:
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