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Electrician's Licensing Exam: Questions and Answers, Exams of Electrical Engineering

Heythrop College, University of LondonElectrical Engineering

A comprehensive set of questions and answers related to the national electrical code (nec), covering various aspects of electrical installations, grounding, bonding, service drops, and safety practices. It is a valuable resource for individuals preparing for electrician licensing exams or seeking to enhance their understanding of electrical codes.

Typology: Exams

2024/2025

Available from 03/14/2025

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Electrician's Licensing Exam
1. NEC Article defines breakers and fuses. <Ans> According to NEC
Article 100, a device that opens and closes a circuit by nonautomatic means
automatically closes for a predetermined overcurrent.
2. Annex of NEC covers conduit fill. <Ans> Annex C of NEC covers
conduit and tubing fill for conductors and fixture wire fill.
3. NEMA stands for National Electrical Manufacturers Association
<Ans> True - NEMA is the acronym for National Electrical Manufacturers
Association.
4. What does it mean when a receptacle has "NEMA 5-20R" on it? <Ans> A
receptacle with NEMA 5-20R on it has an amperes rating of 20, will take a NEMA-
5-15P or NEMA-5-20P plug, and has a voltage rating of 125.
5. NEC Tables 310-10 through 310-21 provide information on. <Ans> The
sizes of copper and aluminum wire, as well as the coating of wire that has fewer
than three current carrying wires in a cable or conduit or that is buried in the earth.
6. Which NEC tables(s) cover(s) the fill of metal boxes? <Ans> The fill of
metal boxes appears in NEC Tables 314.6 A and B.
7. NEC Article address EMT. <Ans> NEC Article 358 covers EMT.
8. Which NEC articles cover the installation requirements for RMC, IMC, and
EMT? <Ans> NEC Articles 342, 344, and 358 outline the installation requirements
of RMC, IMC, and EMT.
9. IN NEC 2008, what does Table 370.6A cover? <Ans> Shows in two columns
(milime- ters and inches), how many wires in trade size you can place in a box.
10. What NEC table would you go to to find trade size of conduit and raceway
size? <Ans> Chapter 9, Table 4 outlines trade size of conduit as well as raceway
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Download Electrician's Licensing Exam: Questions and Answers and more Exams Electrical Engineering in PDF only on Docsity!

Electrician's Licensing Exam

  1. NEC Article defines breakers and fuses. According to NEC Article 100, a device that opens and closes a circuit by nonautomatic means automatically closes for a predetermined overcurrent.
  2. Annex of NEC covers conduit fill. Annex C of NEC covers conduit and tubing fill for conductors and fixture wire fill.
  3. NEMA stands for National Electrical Manufacturers Association True - NEMA is the acronym for National Electrical Manufacturers Association.
  4. What does it mean when a receptacle has "NEMA 5-20R" on it? A receptacle with NEMA 5-20R on it has an amperes rating of 20, will take a NEMA- 5-15P or NEMA-5-20P plug, and has a voltage rating of 125.
  5. NEC Tables 310-10 through 310-21 provide information on. The sizes of copper and aluminum wire, as well as the coating of wire that has fewer than three current carrying wires in a cable or conduit or that is buried in the earth.
  6. Which NEC tables(s) cover(s) the fill of metal boxes? The fill of metal boxes appears in NEC Tables 314.6 A and B.
  7. NEC Article address EMT. NEC Article 358 covers EMT.
  8. Which NEC articles cover the installation requirements for RMC, IMC, and EMT? NEC Articles 342, 344, and 358 outline the installation requirements of RMC, IMC, and EMT.
  9. IN NEC 2008, what does Table 370.6A cover? Shows in two columns (milime- ters and inches), how many wires in trade size you can place in a box.
  10. What NEC table would you go to to find trade size of conduit and raceway size? Chapter 9, Table 4 outlines trade size of conduit as well as raceway

size.

  1. NEC Articles and covers metallic and non-metallic raceways in buildings. NEC Article 386 covers metallic or metal raceway; NEC Article 388 covers PVC pipe.
  2. The Panel Board requirements for Application in Construction appear in NEC Article? NEC Article 408 covers panel board applications.
  3. The smaller kitchen counter requiring a receptacle is inches. A 12in. counter requires a receptacle because it holds small appliances.
  4. What new code is needed for protection in all habitable spaces? According to new codes, ARC fault protection is needed many additional parts of the house.
  5. A 12-foot hallway requires one receptacle to meet code. (True or False) - True, One is required, Two are suggested.
  6. NEC Article 100 is dedicated to? Definitions
  7. The main ground on a service is a(n). Ground Rod
  8. What does NEC Section 250-28A require? A main bonding jumper and a system bonding jumper.
  1. What is the subject of NEC Section 250-2D? Bonding jumpers
  2. are the subject of NEC Section 680-20. Electrical installations at permanently installed pools.
  3. Which NEC Section covers equipment grounding conductors. NEC Sec- tion 250-
  4. Which NEC sections covers identification of equipment grounding con- ductors? NEC Section 250-119 1-
  5. Which NEC Section covers ground terminal identification. NEC Section 250-
  6. Bonding is the establishment of connection between metal parts.- Reliable
  7. NEC Section 250-134 provides information on what topic? Equipment fas- tened or connection between metal parts.
  1. Equipment grounding conductor is (are) discussed in NEC Section 250-130. Connections
  2. NEC Section 250-118 states that a grounded conduct must run flexible conduit. inside
  3. NEC Section oversees bonding of flexible type conduit. NEC Section 250.118(5)
  4. Which NEC article covers cable trays? NEC Article 392
  5. What is the proper procedure for bonding a motor conduit with metal flex? A bonding jumper should be installed inside or outside raceway within 6ft. of attachment. (NEC 250.118)
  6. Threaded pipe can be used for bonding purposes? (True or False) True (NEC 250.92B)
  7. Shoulder fittings with locknuts are allowable as bonding devices? (True or False) True (NEC 250.92B)
  8. What kind of information does NEC Section 250-66 cover? Covers the sizes of alternating current grounding electrode conductors.
  9. NEC Section 250-102 is devoted to equipment. Equipment Bonding Jumpers
  10. Give guidelines for using sheet metal screws as bonding agents. Electri- cians can use sheet metal screws for bonding when those screws are green and have hexagonal heads (NEC 250.8), but it is generally considered unwise.
  11. Which NEC article covers service drops? NEC Article 230
  12. According to NEC, trees are approved service conductors. (True or False)- False, NEC does not approve tress as service conductors.
  1. System and circuit grounding involves taking alternating current to ground? (True or False) True
  2. The process of equipment exposes current-carrying parts to a grounding system. Grounding
  3. Small power tools are protected in what two ways? 1.Insulated Housings.
  4. Ground prong on plugs.
  5. When bonding a plumbing system to the electrical system, it is not neces- sary to jump the water meter as this connection is built into the meter. (True or False) False, run ground wire from panel to copper water pipe then jump the water meter using grounding clamps.
  6. Explain the proper way to ground a subpanel in the same building. To ground a subpanel in the same building, run a four-wire system from main panel to subpanel.
  7. Discuss the proper way to ground a subpanel in another building. To ground a subpanel in the another building, run bare copper wire from subpanel to ground rod inside or outside.
  8. Something that is is connected to ground or to a conductive body that extends the grounding connection. Grounded
  9. Describe a grounding conductor. A grounded conductor is a system or circuit that is intentionally grounded.
  10. Define the term grounding conductor. A grounding conductor is a conductor or circuit of a wiring system to a grounding electrode (ground rod).
  11. A(n) is the fundamental particle of electricity. Electron
  12. Voltage can be fatal to a person. (True or False) False, Current is

fatal to people not Voltage

  1. What determines the severity of an electrical shock? Voltage level, amount of protective clothing, and moisture on skin or outerwear all impact a ground connection.
  2. Grounding reduces the voltage that might cause a fatal electrical shock by allowing excess current to flow to the ground. (True or False) True
  3. and are two types of electrical faults. Ground and Arc are two types of electrical faults.
  4. On a 400-amp services, how many ground rods are required? 2 ground rods 6 ft apart.
  5. The standard length for IMC is? Two outside ground wire are needed on a 400 amp.
  6. NEC allows electricians to ground gas pipes to existing, grounded water pipes. (True or False) True, when those water pipes are grounded.

electrical service is simpler to troubleshoot and repair and is the easier option when running electricity across roadways, waterways, and right-of-ways.

  1. In NEC, Table provides the sizing of grounding electrode conduc- tors. NEC 250.66 provides the sizing of grounding electrode conductors
  2. Describe the process for bonding three 200-amp disconnects to make a proper grounding system. To make a proper grounding system using three 200-amp disconnects, use a ground wire of sufficient size to go from panel to panel with a lug, screw, or ground bar, if provided.
  3. In terms of AWG, what is the minimum grounding conductor size permit- ted? The smallest grounding conductor permitted is 6 awg or larger.
  4. The way to ground a transformer in a commercial building is to place a grounding rod inside the building? (True or False) False, The way to ground a transformer in a commercial building is to place a grounding rod outside or beneath the building.
  5. Why do stoves require a four-wire system? Two hots are needed to operate the stove neutral.The timers and clocks can serve as ground for tripping mechanism.
  1. Why do dryers require a four-wire system? Two hots are needed to operate the heater neutral. The timers can serve as ground for tripping mechanism.
  2. Air-conditioning units, hot water heaters, and baseboard heat require a four-wire system? (True or False) False, a A/C unit needs only 220 and a ground to complete the circuit.
  3. Which of the following NEC sections outlines which air-conditioning sys- tems requires no grounding? NEC 250.
  4. Explain where and why isolated systems are used. Isolated systems are used in healthcare facilities due to explosive gases.
  5. Electricians should put grounded conductors on yellow reciprocal screws? (True or False) False, grounding conuctors belong on the green screws.
  6. On a 200-amp service, the electrician should use or size grounded conductor in the service cable. 2/0 or 4/
  7. When using 500 MCM, or size ground wire is appropriate on a 400-amp service. 350MCM or 400MCM
  8. Name a common application for high impedance grounding. High imped- ance grounding is used for grounding radio towers. NEC 250.20(E)
  9. What is the proper way to test conduit for proper grounding? To test conduit for proper grounding, check ohms or use 120V receptacle and touch to ground to check for voltage.
  10. How does an NEC violation affect the occupancy of an existing installa- tion? Per NEC 90.4, 510.2, and various local codes, occupancy is permitted in the event of a code violation as long as the occupancy remains unchanged and no hazardous condition exists.
  1. NEC 90.1(A) states that the purpose of NEC is the "practical safeguarding of from hazards arising from the use of electricity". people and property
  2. NEC Article 426 recognizes which three kinds of heating systems? Re- sistive, impedance, and skin effect.
  3. What is proper phase arrangement when wiring a three-phase panel- board? Per NEC 450.3, phases must arrange in a particular order A, B, C, from left to right or from top to bottom as seen from the front.
  4. When installing an autotransformer, it is important to remember to insert an OCPD in series with the shunt winding. (True or False) False, Per NEC 450.4 a OCPD is no needed.
  5. Which NEC guidelines guarantee the best workmanship and safest instal- lations possible. NEC 90.1(C)
  6. When NEC Article 100 describes "Feeder" as. "All circuit conductors be- tween the service equipment, the source of a separately derived system, or other power source of a separately derived system, or other power supply source and the final branch-circuit overcurrent device,"
  7. NEC Article outlines the restrictions for using plastic junction or device boxes. NEC 314.
  8. NEC Chapters 1-4 governs basic practices in effect in hazardous areas, except as modified by specific requirements outlined in NEC Chapter .- Chapter 5
  9. Name two hazards found in a Class III hazardous environments. 1. Air-borne Particulate
  10. Sawdust
  1. General-purpose enclosures are NEC approved for intrinsically safe ap- paratuses. (True or False) True, Intrinsically safe areas are safe with out enclo- sure, but enclosure are required for other protections.
  2. Fusing the load side of a transformer sufficiently protects the transformer. (True or False) False, Fuses on the load side do not protect the transformer.
  3. Per NEC 450.3, when a transformer is enclosed, install fuses at the transformer's primary. OCPD
  4. The NEC defines ampacity as, "the current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating"
  5. Where does NEC list the types of insulation material deemed acceptable in wet locations? NEC 310.
  6. Leads to an unused current transformer should be. NEC 110.23 states that, "Unused current transformers associated with potentially energized circuits shall be short circuited."

450.23-26 liquid-filled transformers have different requirements based on the dielectric fluid.

  1. NEC Article 526 helps electricians determine requirements for. - Deicing systems
  2. Disconnects and switches used with appliances must indicate, on their switches, the on- and off-positions. (True or False) True, Per NEC
  4. In a three-phase delta system, the leg with the highest voltage must be . Identified as the "B" leg
  5. Branch circuits must be loaded equally in terms of wattage per unit area. (True or False) True, Per NEC 210.
  6. An electrician can safely recess a panel board into a flammable wall. (True or False) False, NEC 312.3, disallows recessing panels in flammable walls.
  7. All metallic boxes and components must be grounded unless a grounding conductor is absent. (True or False) False, NEC 314.4, requires all metallic boxes to be grounded.
  1. Nameplates that rate protective devices describe which of the following?- Per NEC 422.11, The size of the breaker to use.
  2. NEC maintains no ampacity requirements for fixture wiring because all fixtures undergo the UL approval process. (True or False) False, NEC 402.5 defines ampacity requirements for fixture wires.
  3. The calculations for protecting motor circuits are the same as those for non motor circuits. (True or False) False, Protecting a motor and a motor circuit are two very different things
  4. Per NEC Article 410, luminaires may mount on drop-ceiling tiles. (True or False) False, ceiling tiles are never appropriate device support.
  5. The requirements for burying 240V conductors are found in NEC .- NEC 300.5, provides requirements up to 600V
  6. NEC outlines the requirements fo AC type (armored) cable. NEC 320
  7. A garage door opener is considered an appliance for NEC purpose. (True or False) True, Per NEC 422.
  8. Appliances with motors over 0.125 hp must have a separate means of disconnect. (True or False) True, Per NEC 422.
  9. When running new work over old, hanging a second support from a primary support is acceptable practice. (True or False) True, Per NEC 300.11 hanging a second support when running new over old is acceptable and a common practice.
  10. Installation of a floor drain in a vault intended for wet transformer(s) is . Per NEC 450.46 only transformers over 100KW require a drain, however installing a drain in case of dielectric spills is good practice.

of the first 10KW and 50% of the demand above 10KW. In this case, the demand factor would be 10,000 plus half the remaining 10,000 or 15,000W

  1. NEC allows how many disconnects per service entrance? Per NEC 225.34, a maximum of six disconnects are allowed per service entrance.
  2. In a given NEC section, Subsection (2) contains. Terms and Defini- tions
  3. Overcurrent insufficient to trip a breaker can prove hazardous under the right conditions. (True or False) True
  4. Name 3 situations AFCI protection is required. 1. Branch circuit in which the initial run is encased in AC up to the first receptacle, which is mounted in a plastic box.
  5. Branch circuit in which the initial run is encased in AC up to the first receptacle, which is mounted in a metal box.
  6. clothes closet measuring more than 10 sq ft.
  7. In a multiphase system in which one phase is used as a single-phase source, which conductor serves as ground? Per NEC 250.26, The Neutral conductor serves as ground.
  8. In NEC terms, what does the phrase in sight mean? Visible and within 50 ft.
  9. What is the difference between NFPA 70 and NEC? NEC is also know as the NFPA 70
  10. Property owners can act as their own AHJs. (True or False) Per NEC 100, Property owners can act as their own "Authority Having Jurisdiction" (AHJ)
  1. What demand factor applies when calculating loading requirements for an apartment building with 21 units? A building with over 100 units? Per NEC 220.84, A 21 unit building would be rated at 32% and any occupancy over 62 units rated at 23%
  2. NEC defines "Bonding" as, "The permanent joining of metallic parts to form an electrically conductive path that ensures electrical continuity and the capacity to conduct safely any current likely to be imposed."
  3. NEC Table 250.66 applies to the derived conductors of separately derived AC systems. (True or False) True
  4. A ground ring encircling a building or structure, in direct with the earth consisting of at least ft. of bare copper not smaller than AWG, shall be permitted as an electrode. 20ft. of bare copper not smaller than 2 AWG
  5. Where a main bonding jumper or a system bonding jumper is a screw only, the screw shall be identified with a finish that shall be visible with the screw installed. Green finish