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Electrician’s Licensing Exam – Electrical Trade
Certification – study material
NEC Article ______ defines breakers and fuses. - correct answer ✔✔According to NEC Article 100, a device that opens and closes a circuit by nonautomatic means automatically closes for a predetermined overcurrent. Annex _____ of NEC covers conduit fill. - correct answer ✔✔Annex C of NEC covers conduit and tubing fill for conductors and fixture wire fill. NEMA stands for National Electrical Manufacturers Association - correct answer ✔✔True - NEMA is the acronym for National Electrical Manufacturers Association. What does it mean when a receptacle has "NEMA 5-20R" on it? - correct answer ✔✔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. NEC Tables 310-10 through 310-21 provide information on. - correct answer ✔✔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. Which NEC tables(s) cover(s) the fill of metal boxes? - correct answer ✔✔The fill of metal boxes appears in NEC Tables 314.6 A and B. NEC Article _____ address EMT. - correct answer ✔✔NEC Article 358 covers EMT.
Which NEC articles cover the installation requirements for RMC, IMC, and EMT? - correct answer ✔✔NEC Articles 342, 344, and 358 outline the installation requirements of RMC, IMC, and EMT. IN NEC 2008, what does Table 370.6A cover? - correct answer ✔✔Shows in two columns (milimeters and inches), how many wires in trade size you can place in a box. What NEC table would you go to to find trade size of conduit and raceway size? - correct answer ✔✔Chapter 9, Table 4 outlines trade size of conduit as well as raceway size. NEC Articles _____ and _____ covers metallic and non-metallic raceways in buildings. - correct answer ✔✔NEC Article 386 covers metallic or metal raceway; NEC Article 388 covers PVC pipe. The Panel Board requirements for Application in Construction appear in NEC Article? - correct answer ✔✔NEC Article 408 covers panel board applications. The smaller kitchen counter requiring a receptacle is _____ inches. - correct answer ✔✔A 12in. counter requires a receptacle because it holds small appliances. What new code is needed for protection in all habitable spaces? - correct answer ✔✔According to new codes, ARC fault protection is needed many additional parts of the house. A 12-foot hallway requires one receptacle to meet code. (True or False) - correct answer ✔✔True, One is required, Two are suggested. NEC Article 100 is dedicated to? - correct answer ✔✔Definitions
Define a grounding system according to NEC. - correct answer ✔✔A gounding system is connected to the ground or to a conductive body that extends the ground connection. What is the topic of NEC Section 250-122? - correct answer ✔✔Is dedicated to the sizes of the grounding conductor What is the NEC definition of a circuit breaker? - correct answer ✔✔A device designed to trip when an overcurrent is detected. NEC Section 300-13 provides information on? - correct answer ✔✔Mechanical and Electrical continuity conductors. What is the subject of NEC Section 250-2D? - correct answer ✔✔Bonding jumpers ______ are the subject of NEC Section 680-20. - correct answer ✔✔Electrical installations at permanently installed pools. Which NEC Section covers equipment grounding conductors. - correct answer ✔✔NEC Section 250- Which NEC sections covers identification of equipment grounding conductors? - correct answer ✔✔NEC Section 250-119 1- Which NEC Section covers ground terminal identification. - correct answer ✔✔NEC Section 250- Bonding is the establishment of ______ connection between metal parts. - correct answer ✔✔Reliable
NEC Section 250-134 provides information on what topic? - correct answer ✔✔Equipment fastened or connection between metal parts. Equipment grounding conductor _____ is (are) discussed in NEC Section 250-
- correct answer ✔✔Connections NEC Section 250-118 states that a grounded conduct must run _____ flexible conduit. - correct answer ✔✔inside NEC Section _____ oversees bonding of flexible type conduit. - correct answer ✔✔NEC Section 250.118(5) Which NEC article covers cable trays? - correct answer ✔✔NEC Article 392 What is the proper procedure for bonding a motor conduit with metal flex? - correct answer ✔✔A bonding jumper should be installed inside or outside raceway within 6ft. of attachment. (NEC 250.118) Threaded pipe can be used for bonding purposes? (True or False) - correct answer ✔✔True (NEC 250.92B) Shoulder fittings with locknuts are allowable as bonding devices? (True or False) - correct answer ✔✔True (NEC 250.92B) What kind of information does NEC Section 250-66 cover? - correct answer ✔✔Covers the sizes of alternating current grounding electrode conductors. NEC Section 250-102 is devoted to equipment _____. - correct answer ✔✔Equipment Bonding Jumpers
Which NEC Article covers grounding? - correct answer ✔✔NEC Article 250 System and circuit grounding involves taking alternating current to ground? (True or False) - correct answer ✔✔True The process of equipment _____ exposes current-carrying parts to a grounding system. - correct answer ✔✔Grounding Small power tools are protected in what two ways? - correct answer ✔✔1.Insulated Housings.
- Ground prong on plugs. When bonding a plumbing system to the electrical system, it is not necessary to jump the water meter as this connection is built into the meter. (True or False) - correct answer ✔✔False, run ground wire from panel to copper water pipe then jump the water meter using grounding clamps. Explain the proper way to ground a subpanel in the same building. - correct answer ✔✔To ground a subpanel in the same building, run a four-wire system from main panel to subpanel. Discuss the proper way to ground a subpanel in another building. - correct answer ✔✔To ground a subpanel in the another building, run bare copper wire from subpanel to ground rod inside or outside. Something that is ______ is connected to ground or to a conductive body that extends the grounding connection. - correct answer ✔✔Grounded Describe a grounding conductor. - correct answer ✔✔A grounded conductor is a system or circuit that is intentionally grounded.
Define the term grounding conductor. - correct answer ✔✔A grounding conductor is a conductor or circuit of a wiring system to a grounding electrode (ground rod). A(n) _____ is the fundamental particle of electricity. - correct answer ✔✔Electron Voltage can be fatal to a person. (True or False) - correct answer ✔✔False, Current is fatal to people not Voltage What determines the severity of an electrical shock? - correct answer ✔✔Voltage level, amount of protective clothing, and moisture on skin or outerwear all impact a ground connection. Grounding reduces the voltage that might cause a fatal electrical shock by allowing excess current to flow to the ground. (True or False) - correct answer ✔✔True _____ and ______ are two types of electrical faults. - correct answer ✔✔Ground and Arc are two types of electrical faults. On a 400-amp services, how many ground rods are required? - correct answer ✔✔2 ground rods 6 ft apart. The standard length for IMC is? - correct answer ✔✔Two outside ground wire are needed on a 400 amp. NEC allows electricians to ground gas pipes to existing, grounded water pipes. (True or False) - correct answer ✔✔True, when those water pipes are grounded.
Underground service is simpler to troubleshoot and repair than overhead service? (True or False) - correct answer ✔✔Relative to underground service, overhead electrical service is simpler to troubleshoot and repair and is the easier option when running electricity across roadways, waterways, and right-of-ways. In NEC, Table _____ provides the sizing of grounding electrode conductors. - correct answer ✔✔NEC 250.66 provides the sizing of grounding electrode conductors Describe the process for bonding three 200-amp disconnects to make a proper grounding system. - correct answer ✔✔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. In terms of AWG, what is the minimum grounding conductor size permitted? - correct answer ✔✔The smallest grounding conductor permitted is 6 awg or larger. The way to ground a transformer in a commercial building is to place a grounding rod inside the building? (True or False) - correct answer ✔✔False, The way to ground a transformer in a commercial building is to place a grounding rod outside or beneath the building. Why do stoves require a four-wire system? - correct answer ✔✔Two hots are needed to operate the stove neutral. The timers and clocks can serve as ground for tripping mechanism. Why do dryers require a four-wire system? - correct answer ✔✔Two hots are needed to operate the heater neutral. The timers can serve as ground for tripping mechanism.
Air-conditioning units, hot water heaters, and baseboard heat require a four- wire system? (True or False) - correct answer ✔✔False, a A/C unit needs only 220 and a ground to complete the circuit. Which of the following NEC sections outlines which air-conditioning systems requires no grounding? - correct answer ✔✔NEC 250. Explain where and why isolated systems are used. - correct answer ✔✔Isolated systems are used in healthcare facilities due to explosive gases. Electricians should put grounded conductors on yellow reciprocal screws? (True or False) - correct answer ✔✔False, grounding conuctors belong on the green screws. On a 200-amp service, the electrician should use _____ or _____ size grounded conductor in the service cable. - correct answer ✔✔2/0 or 4/ When using 500 MCM, _____ or ______ size ground wire is appropriate on a 400-amp service. - correct answer ✔✔350MCM or 400MCM Name a common application for high impedance grounding. - correct answer ✔✔High impedance grounding is used for grounding radio towers. NEC 250.20(E) What is the proper way to test conduit for proper grounding? - correct answer ✔✔To test conduit for proper grounding, check ohms or use 120V receptacle and touch to ground to check for voltage. How does an NEC violation affect the occupancy of an existing installation? - correct answer ✔✔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.
NEC Article 426 recognizes which three kinds of heating systems? - correct answer ✔✔Resistive, impedance, and skin effect. What is proper phase arrangement when wiring a three-phase panelboard? - correct answer ✔✔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. When installing an autotransformer, it is important to remember to insert an OCPD in series with the shunt winding. (True or False) - correct answer ✔✔False, Per NEC 450.4 a OCPD is no needed. Which NEC guidelines guarantee the best workmanship and safest installations possible. - correct answer ✔✔NEC 90.1(C) When NEC Article 100 describes "Feeder" as. - correct answer ✔✔"All circuit conductors between 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," NEC Article _____ outlines the restrictions for using plastic junction or device boxes. - correct answer ✔✔NEC 314. NEC Chapters 1-4 governs basic practices in effect in hazardous areas, except as modified by specific requirements outlined in NEC Chapter _____. - correct answer ✔✔Chapter 5 Name two hazards found in a Class III hazardous environments. - correct answer ✔✔1. Air-borne Particulate
- Sawdust
General-purpose enclosures are NEC approved for intrinsically safe apparatuses. (True or False) - correct answer ✔✔True, Intrinsically safe areas are safe with out enclosure, but enclosure are required for other protections. Fusing the load side of a transformer sufficiently protects the transformer. (True or False) - correct answer ✔✔False, Fuses on the load side do not protect the transformer. Per NEC 450.3, when a transformer is enclosed, install _____ fuses at the transformer's primary. - correct answer ✔✔OCPD The NEC defines ampacity as, - correct answer ✔✔"the current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating" Where does NEC list the types of insulation material deemed acceptable in wet locations? - correct answer ✔✔NEC 310. Leads to an unused current transformer should be. - correct answer ✔✔NEC 110.23 states that, "Unused current transformers associated with potentially energized circuits shall be short circuited." In what sections does NEC outline the requirements for appliance calculations? - correct answer ✔✔NEC 220.16 - 220.20 cover appliance calculations. Typically, transformers are available in one of two types: _____ and _____. - correct answer ✔✔Liquid Filled and Dry Versions NEC Chapter 9, Table 5, states, - correct answer ✔✔To locate wire type and size to be installed. Repeat for each conductor, keeping a running total. Derate by 40% to ge the total raceway area.
Disconnects and switches used with appliances must indicate, on their switches, the on- and off-positions. (True or False) - correct answer ✔✔True, Per NEC 422. In a three-phase delta system, the leg with the highest voltage must be _____. - correct answer ✔✔Identified as the "B" leg Branch circuits must be loaded equally in terms of wattage per unit area. (True or False) - correct answer ✔✔True, Per NEC 210. An electrician can safely recess a panel board into a flammable wall. (True or False) - correct answer ✔✔False, NEC 312.3, disallows recessing panels in flammable walls. All metallic boxes and components must be grounded unless a grounding conductor is absent. (True or False) - correct answer ✔✔False, NEC 314.4, requires all metallic boxes to be grounded. Nameplates that rate protective devices describe which of the following? - correct answer ✔✔Per NEC 422.11, The size of the breaker to use. NEC maintains no ampacity requirements for fixture wiring because all fixtures undergo the UL approval process. (True or False) - correct answer ✔✔False, NEC 402.5 defines ampacity requirements for fixture wires. The calculations for protecting motor circuits are the same as those for non motor circuits. (True or False) - correct answer ✔✔False, Protecting a motor and a motor circuit are two very different things
Per NEC Article 410, luminaires may mount on drop-ceiling tiles. (True or False) - correct answer ✔✔False, ceiling tiles are never appropriate device support. The requirements for burying 240V conductors are found in NEC _____. - correct answer ✔✔NEC 300.5, provides requirements up to 600V NEC _____ outlines the requirements fo AC type (armored) cable. - correct answer ✔✔NEC 320 A garage door opener is considered an appliance for NEC purpose. (True or False) - correct answer ✔✔True, Per NEC 422. Appliances with motors over 0.125 hp must have a separate means of disconnect. (True or False) - correct answer ✔✔True, Per NEC 422. When running new work over old, hanging a second support from a primary support is acceptable practice. (True or False) - correct answer ✔✔True, Per NEC 300.11 hanging a second support when running new over old is acceptable and a common practice. Installation of a floor drain in a vault intended for wet transformer(s) is ______. - correct answer ✔✔Per NEC 450.46 only transformers over 100KW require a drain, however installing a drain in case of dielectric spills is good practice. A TVSS provides adequate protection against lighting strikes. (True or False) - correct answer ✔✔False, a TVSS is only for protecting against predictable anomalies, and short-duration spikes of high-voltage. It is possible to violate the NEC by tightening a bolt or fastener too tight. (True or False) - correct answer ✔✔True, all equipment must be installed per
In a multiphase system in which one phase is used as a single-phase source, which conductor serves as ground? - correct answer ✔✔Per NEC 250.26, The Neutral conductor serves as ground. In NEC terms, what does the phrase in sight mean? - correct answer ✔✔Visible and within 50 ft. What is the difference between NFPA 70 and NEC? - correct answer ✔✔NEC is also know as the NFPA 70 Property owners can act as their own AHJs. (True or False) - correct answer ✔✔Per NEC 100, Property owners can act as their own "Authority Having Jurisdiction" (AHJ) What demand factor applies when calculating loading requirements for an apartment building with 21 units? A building with over 100 units? - correct answer ✔✔Per NEC 220.84, A 21 unit building would be rated at 32% and any occupancy over 62 units rated at 23% NEC defines "Bonding" as, - correct answer ✔✔"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." NEC Table 250.66 applies to the derived conductors of separately derived AC systems. (True or False) - correct answer ✔✔True 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. - correct answer ✔✔20ft. of bare copper not smaller than 2 AWG
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. - correct answer ✔✔Green finish NEC Table 220.42 can be used to calculate lighting loads in a restaurant dining area. (True or False) - correct answer ✔✔False, demand factors of lighting does not apply to this table. Outdoor lighting installations exceeding _____ are subject to the clearance requirements outlined in NEC 225.7 - correct answer ✔✔120V Open conductors belonging to separate circuits must be separated by? - correct answer ✔✔Per NEC 225.14, separated by 4in. NEC requires a panelboard circuit directory. (True or False) - correct answer ✔✔True, although there are exceptions. A tree over 50 ft. high may be used as an overhead service support for a single-story residence only. (True or False) - correct answer ✔✔Per NEC 230.10, vegetation is disallowed as a support device. What is the maximum number of sets of service conductors a service drop or lateral may supply? - correct answer ✔✔Per NEC 230.40, "Every service drop or lateral shall supply only one set of service entrance conductors." ampacity - correct answer ✔✔The maximum amount of electrical current a conductor or device can carry before sustaining immediate or progressive deterioration.
