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Journeyman Electrician Exam (NEC) practice questions

215 free questions with answers and explanations.

Practice test
  1. 201.A journeyman electrician is installing a 20-ampere branch circuit for general-purpose receptacles in a new dwelling unit garage. How many such branch circuits are minimally required for this garage by the NEC?Equipment and Devices
  2. 202.A technician is installing a motor control circuit that operates at 120V and is protected by a 15A overcurrent protective device. The control circuit conductors are installed in a raceway. What is the minimum size copper control circuit conductor permitted for this installation, assuming it does not extend beyond the motor starter enclosure?Control Devices and Motors
  3. 203.A client requests a motor control system that provides soft starting and stopping, precise speed regulation over a wide range, and improved energy efficiency for a 100 hp pump motor. Which type of motor control device best meets these requirements?Control Devices and Motors
  4. 204.A dwelling unit has a total calculated general lighting and receptacle load of 10,000 VA. What is the minimum number of 15-ampere, 120-volt general-purpose branch circuits required to serve this load, excluding laundry and small-appliance circuits?Services, Feeders, and Branch Circuits
  5. 205.A service entrance conductor for a commercial building is installed underground in a rigid metal conduit (RMC). The service is 480Y/277V, 3-phase. What is the minimum cover depth required for this RMC, assuming it is not subject to vehicular traffic?Services, Feeders, and Branch Circuits
  6. 206.A technician is installing a 25 hp, 460V, three-phase motor. The motor nameplate indicates a full-load current (FLA) of 34A and a service factor (SF) of 1.15. What is the maximum permissible setting for the continuous-duty thermal overload protection device, assuming it is a separate device?Control Devices and Motors
  7. 207.A commercial building has a 480Y/277V, 3-phase, 4-wire service. The main service disconnecting means consists of six circuit breakers in a single enclosure. What is the maximum number of disconnecting means permitted for a single service?Services, Feeders, and Branch Circuits
  8. 208.A client requests a 120-volt, 20-ampere branch circuit for general-purpose receptacles in a dwelling unit. What is the minimum size copper equipment grounding conductor (EGC) required for this circuit?Services, Feeders, and Branch Circuits
  9. 209.A commercial occupancy has a 200-ampere, 120/208V, 3-phase, 4-wire service. The feeder supplying a panelboard has an overcurrent protective device rated for 150 amperes. What is the minimum required working space depth in front of this panelboard, assuming exposed live parts on one side and a grounded wall on the other, for a voltage to ground of 120V?Services, Feeders, and Branch Circuits
  10. 210.A dwelling unit has a 240V, 8 kW electric range. What is the calculated demand load in amperes for this range, assuming only one range is installed?Services, Feeders, and Branch Circuits
  11. 211.A commercial kitchen requires a feeder for a continuous load of 75 amperes and a noncontinuous load of 50 amperes. The feeder conductors are copper, rated 75°C. What is the minimum required rating of the overcurrent protective device (OCPD) for this feeder?Services, Feeders, and Branch Circuits
  12. 212.A client has a critical industrial process requiring a motor control system that must safely stop a 15 hp, 460V, three-phase motor even if the control circuit power is lost. Which type of motor control circuit provides this inherent safety feature?Control Devices and Motors
  13. 213.A dwelling unit has a 200-ampere, 120/240V, single-phase service. What is the minimum size aluminum grounding electrode conductor (GEC) required to connect to a concrete-encased electrode?Services, Feeders, and Branch Circuits
  14. 214.A technician is installing a new 25 hp, 460V, three-phase motor. The motor has a nameplate full-load current (FLA) of 34A and a Service Factor (SF) of 1.15. According to NEC 430.32(A)(1), what is the maximum setting for the continuous-duty thermal overload protection for this motor?Control Devices and Motors
  15. 215.A commercial building has a 400-ampere, 208Y/120V, 3-phase, 4-wire service. The main service disconnecting means is a single circuit breaker. The service entrance conductors are 500 kcmil copper, 75°C rated. What is the minimum size copper grounding electrode conductor (GEC) required to connect to a metal underground water pipe electrode?Services, Feeders, and Branch Circuits