NEC Apprentice of the Year (AOY) Practice Exam

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• How does the NEC define a "temporary wiring installation"?
• Which NEC table is used to determine the minimum size equipment grounding conductor for a generator supplying a separate building?
• If two ground rod type electrodes are installed for an AC service, what is the minimum separation required between them?
• How is the grounded conductor typically connected to the service disconnecting means enclosure?
• What type of barriers are required for hazardous locations?
• Listed current-limiting fuses have which of the following features to prevent incorrect installations?
• Which element in the grounded electrical circuit is not an effective path for ground fault current?
• Why are service conductors not considered tap conductors?
• How often is the NEC updated?
• What must be ensured for the installation of temporary electrical systems according to NEC?
• Current will take which path to return to its source?
• What is the voltage threshold above which medium- and high-voltage cables are generally required to be shielded?
• What is a common requirement for obtaining an electrical installer license?
• What is required from electrical installers in regard to licensing?
• Why is licensing important for electrical installers?
• What is the definition of a "circuit"?
• Which of the following is NOT considered an acceptable grounding electrode for a building or structure?
• A person in which condition with an energized circuit could result in all circuit current passing through their body?
• What standard must be followed when handling arc-fault circuits?
• When is a bond required for electrical equipment?
• What purpose do electrical panels serve?
• Accepted industry practices are described in which document related to electrical construction?
• What does "bonding" refer to in electrical installation?
• Which of the following is NOT classified as a device in electrical terms?
• The recommended mounting heights for NECA-1, Section 11, Table 3, are measured from the finished floor to the what?
• What is a major advantage of wire mesh cable tray (WMCT) installations?
• What is the available fault current at a transformer with 1,000 kVA and 1.3% impedance?
• What color wire is typically used for grounding?
• What does Article 310 of the NEC specifically concern?
• Which statement is true regarding continuing education for licensed electrical installers?
• An electrical system supplying industrial electric furnaces is not required to be what?
• What type of switches must be installed to control a single luminaire from multiple locations?
• What does “non-metallic sheathed cable” refer to in the NEC?
• Which agency primarily oversees the compliance and standards of electrical safety?
• Which of the following best describes the term “combustible dust” as it relates to hazardous locations?
• What is the minimum size for a bonding jumper between a power system grounding electrode and a separate electrode?
• A spool of single conductor, black electrical wire is generally considered to be a what conductor?
• Which of the following is NOT considered a type of ground-fault protection of equipment?
• Motor overcurrent protection includes the motor overload protection and which other type?
• What kind of environments must be considered while performing load calculations?
• What is a primary reason for grounding electrical systems?
• Which of the following best describes the purpose of licensing in the electrical installation field?
• What is the primary purpose of a ground-fault circuit-interrupter (GFCI)?
• What is the purpose of specifying ampacity in conductors?
• Which of the following is NOT a common operating function of a circuit breaker?
• NEC Table 8 of Chapter 9 may be used to find the what of an aluminum conductor?
• What is the function of a circuit breaker?
• Why is adequate illumination important in commercial lighting requirements?
• Describe a receptacle in the context of the NEC.
• Which of the following is a key principle covered by the NEC?
• What is the primary purpose of a Ground Fault Circuit Interrupter (GFCI)?
• Which type of systems is chapter 8 of the National Electrical Code specifically related to?
• What is the recommended installation height for light switches according to the NEC?
• What is the role of a grounding electrode system?
• What must be ensured when using conductors in wet locations?
• Where the grounded conductor for a service carries no load, what is the minimum size required?
• What must be done before working on energized equipment according to the NEC?
• In electrical installation, what is the necessity of having a connection to ground (earth)?
• Which of the following steps is generally NOT required to achieve a license as an electrical installer?
• How are hazardous locations defined according to the NEC?
• Current-limiting OCPDs provide superior protection by reducing what during short-circuit conditions?
• In electrical wiring, what does "voltage drop" refer to?
• What should be done at all critical points in an electrical system?
• Ungrounded AC systems operating between 120 volts and what voltage must have ground detectors installed?
• What should be done if an electrical conductor is found to be damaged?
• What classification describes equipment that prevents moisture from entering under specified conditions?
• In the NEC, what is meant by "overcurrent protection"?
• Using Table 310.4(A), the insulation thickness of an 8 AWG THW conductor is what?
• What type of motors does Article 430 of the NEC cover?
• What is the most commonly used wiring method in residential installations?
• During fault conditions, how do circuit breaker contacts react when the current sensing means un-latches the latching mechanism?
• Which is NOT an important periodic factor to ensure circuit breakers are operating within specifications?
• What does Article 250 of the NEC address?
• A 120-volt, single-phase, 2-wire system is required to be what?
• What is the purpose of performing fault-current calculations?
• What is “derating” when referring to conductors?
• What is the primary concern related to safeguarding in the evaluation of electrical equipment?
• What type of equipment requires a properly sized bonding jumper for safety?
• Which conductor provides the best path back to the source of an electrical system?
• Application-limited OCPDs are allowed under what conditions?
• When conducting a short-circuit study, which of the following is considered a source of fault current?
• Who is responsible for the approval of electrical equipment?
• Which system must be in place for electrical service installations in residential areas according to NEC?
• What consequence does failing to adhere to licensing regulations generally lead to?
• In electrical terminologies, which term refers to the actual location where a utility connects to a property's wiring system?
• Which of the following is NOT a critical point for fault-current calculations?
• Which type of device is designed to limit the flow of electrical current?
• How is a "dedicated circuit" defined in electrical codes?
• What term best describes when current leaves the normal conductive path and creates a high current flow?
• The NEC indicates that underground conduits are to be located in a what location?
• According to 2014 NEC, how many equipment grounding conductor paths should an isolated grounding receptacle in a patient area have?
• What is the limiting temperature of any conductor in relation to its associated jurisdiction?
• What is the significance of the "NEC Handbook"?
• Which of the following is a common requirement for commercial electrical installations?
• Which of the following is NOT a true statement regarding Class J fuses?
• What is the minimum size bonding conductor required for metal parts associated with a neon sign, if the neon transformer output voltage is 7,500 volts?
• An arcing fault has a path that is best described as what?
• Grounding and bonding occur to provide which of the following?
• Which of the following fuses would be the best selection for DC photovoltaic source and output currents?
• What section of the NEC addresses residential and commercial wiring standards?
• The NEC permits busway taps only in an industrial establishment where the maximum length of the tap does not exceed which of the following?
• What does NEC stand for in the context of electrical training?
• Which classification is defined as an accessory that performs a mechanical function in a wiring system?
• If the largest ungrounded service-entrance conductor is 900 kcmil, what is the minimum size required for a bonding jumper?
• Motor circuit protectors (MCPs) are devices intended for what kind of protection for motor branch circuits?
• What is the minimum size for a wire-type equipment grounding conductor when a feeder is installed in PVC conduit for a separate building or structure?
• What is a feeder according to NEC terminology?
• As a circuit breaker interrupts a fault current, the contacts start to part and the ensuing arcing current is thrown to the which of the following?
• What type of work might unlicensed electrical installers be restricted from performing?
• When must an electrical worker ensure that a grounding electrode conductor is accessible?
• Which type of circuit must be used for temporary lighting according to the NEC?
• Which of the following is NOT a conductor type defined in the NEC?
• Bonding non-current carrying metal parts of equipment minimizes differences of which parameter?
• What is the maximum size for a grounding electrode required if the connection to earth is through a single ground rod?
• How does licensing benefit clients of electrical installers?
• What type of system has no connection from any conductor to ground or any conductive body that extends the ground connection?
• Which type of conductor is recognized by the NEC?
• Motor and branch-circuit overload protection is selected to trip based on a percentage of which of the following?
• How is an electrical raceway defined according to the NEC?
• Which statement is true regarding arc-flash hazard assessments?
• What are service-entrance conductors according to the NEC?
• What advantage do licensed electrical installers have over unlicensed ones?
• Feeder tap conductors are intended to be protected from what by the feeder OCPD?
• Under what conditions are separately derived systems not required to be grounded when supplied by transformers rated under 1,000 volts?
• What does UL's Field Evaluation Product Mark signify?
• For a grounded conductor to be used for grounding at a separate building supplied by an existing feeder, which must not be bonded to the grounding system?
• How is "electrical service" defined in NEC guidelines?
• What best defines a branch circuit that has equal voltage between the grounded and ungrounded conductors?
• Which NEC table determines the minimum size of a bonding jumper for a water piping system at a separate building?
• Which of the following items is NOT defined as a raceway?
• What is the lighting load for a two-story, single-family dwelling unit with dimensions of 32' by 85'?
• The circuit conductors between the final overcurrent protective device and the outlets are best defined as what?
• What must be true of all grounding electrodes at each building or structure served by electricity?
• In what way do licensing requirements vary between different regions?
• According to the NEC, where must a grounding electrode conductor be connected?
• The highest current at rated voltage that an OCPD can interrupt under standard test conditions is known as what?
• Which NEC rule clarifies grounding requirements for ungrounded systems?
• Which of the following insulation types is NOT moisture resistant?
• What does Article 520 of the NEC specifically address?
• What encloses the various parts of the most popular type of circuit breakers?
• In which scenario would grounding and bonding NOT provide protection?
• What is the requirement for outdoor receptacles as per NEC?
• Which of the following is not permitted to be used as a grounding electrode?
• In the NEC, which chapters apply to special occupancies and may modify the requirements in chapters 1 through 4?
• What are the minimum depth requirements for buried conductors, according to the NEC?
• A mark applied to the equipment by a testing laboratory such as United Laboratories (UL) provides evidence of what?
• Why is the Earth considered a poor conductor?
• High-impedance grounded neutral systems shall be permitted under which circumstances for 3-phase AC systems of 480 volts to 1,000 volts?
• Which aspect is generally not mandatory in the evaluation of electrical equipment?
• Which installation is covered by the National Electrical Code?
• Which of the following is NOT permitted as a conductor material for conductors covered by Article 310?
• What is a requirement for service disconnecting means as per the NEC?
• If a fault current exceeds the capability of the OCPD to interrupt, the OCPD may what?
• How can electrical installers demonstrate their compliance with safety standards?
• The current that flows due to a short-circuit condition is termed what?
• What does effective ground-fault current path refer to?
• What is the purpose of a junction box in electrical wiring?
• Which of the following is NOT a true statement regarding fuse testing and maintenance?
• What does Article 700 of the National Electrical Code (NEC) cover?
• What is the minimum size for covers of large junction or pull boxes that should be hinged or sectionalized?
• What is the function of a circuit breaker in electrical systems?
• The NEC indicates that an area outdoors, but located under canopies, is considered to be a what location?
• What is the primary purpose of grounding in an electrical system?
• Which of the following is a consequence of not being properly licensed as an electrical installer?
• What defines the faster reaction time of an overcurrent device at higher current levels during a fault?
• What is the required distance that outlets must be placed from the floor in living spaces according to NEC?
• Which factors should be considered during load calculations?
• An accessory like a locknut primarily serving a mechanical function is referred to as what?
• What is the minimum finish rating required for walls, floors, and ceilings where electrical nonmetallic tubing is concealed in buildings over three floors?
• What is the intention behind overcurrent protective devices (OCPDs)?
• In which environment must arc-fault circuit interrupters be primarily used?
• Why is it important to adhere to the NEC when installing electrical systems?
• A type XHHW insulated conductor in a wet location application has a maximum generating temperature of what?
• What is one method used to judge the suitability for the use of a device?
• According to Article 310, Part III, what is the smallest size general-use copper conductor permitted for general wiring?
• What is the minimum ampacity for a residential circuit in the NEC?
• What is the maximum allowable voltage in low-voltage installations according to most NEC guidelines?
• What does the term "load calculation" refer to in electrical terms?
• Why is it crucial to ensure that outlets are no higher than 48 inches from the floor?
• What is a service point in electrical terminology?
• What requirement does the NEC set for lighting in commercial spaces?
• How many 3-way switches and 4-way switches are needed to control a single stairway luminaire from four separate locations?
• Which category of OCPD is typically permitted to protect control circuits, luminaires, and appliances?
• For a 500-ampere service supplied with 750-kcmil copper as the largest ungrounded service-entrance conductor, what is the minimum size aluminum bonding jumper for the water piping system?
• What is the primary purpose of the NEC?
• Which of these is a common outcome of failing to replace a damaged conductor?
• If receptacles are not marked as CO/ALR, what type of conductors are they suitable for use with?
• Why might a construction company prefer hiring licensed electricians?
• In relation to electrical standards, what does ANSI stand for?
• A single rod, pipe, or plate electrode must have a resistance to ground not greater than what value?