2024 Edition

Master Electrician - Test 2 - 2014 NEC

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1.	Photovoltaic systems with dc source circuits, dc output circuits, or both, operating at a PV system MAXIMUM system voltage of at LEAST_____ or greater, is required to be protected by a listed (dc) arc-fault circuit interrupter, PV type, or other system components listed to provide equivalent protection.
		A. 24 volts
		B. 80 volts
		C. 100 volts
		D. 120 volts
The requirement indicated in Section 690.11 is limited to PV systems with a maximum voltage of 80 volts or greater. PV systems can be subjected to extreme environmental conditions such as, wind, rain, snow, ice, and elevated temperature extremes. These systems can deteriorate over time and eventually develop insulation failures or internal PV module conductor fault conditions. The AFCI device is provided to interrupt arcing faults resulting from a failure in the intended continuity of a conductor, connection, module, or other system component in the dc PV circuits. Incorrect answer. Please choose another answer.

2.	In wall or ceilings with a surface of noncombustible material such as concrete, tile or gypsum, outlet boxes employing a flush-type cover or faceplate shall be installed so that the front edge of the box, plaster ring, or extension ring will not be set back of the finished surface more than _____.
		A. 1/4 in.
		B. 1/2 in.
		C. 3/4 in.
		D. 1 in.
Section 314.20 applies only to the construction of the surface of the wall or ceiling and not to its structure or subsurface. Therefore, a wall constructed of wood but sheathed with an outer layer of gypsum board is permitted to contain boxes set back or recessed not more than in. Using an opposite example, a wall constructed of metal studs but finished with wood panels requires that the outlet boxes be mounted flush with the combustible material. Incorrect answer. Please choose another answer.

3.	What is the MINIMUM size equipment bonding jumper allowed for receptacles connected to a 20-ampere branch circuit in a critical care area of a hospital?
		A. 8 AWG
		B. 10 AWG
		C. 12 AWG
		D. 14 AWG
In compliance with Section 517.19(D), each patient care vicinity in a critical care area of a hospital is permitted to have a patient equipment grounding point. An equipment bonding jumper not smaller than 10 AWG shall be used to connect the grounding terminal of all grounding-type receptacles to the patient equipment grounding point. Incorrect answer. Please choose another answer.

4.	The branch circuit conductors supplying one or more units of information technology equipment shall have an ampacity of NOT less than _____ of the connected load.
		A. 80 percent
		B. 100 percent
		C. 115 percent
		D. 125 percent
The intent of Section 645.5(A) is to recognize that information technology equipment can operate for over 3 hours, therefore it is to be considered a continuous load and the branch-circuit conductors supplying the equipment are to have an ampacity not less than 125% of the total connected load. Incorrect answer. Please choose another answer.

5.	Where luminaires are located over an indoor installed hot tub and protected by a ground-fault circuit-interrupter, they shall be installed at a MINIMUM height of _____.
		A. 8 ft.
		B. 10 ft.
		C. 12 ft.
		D. 7 ft.
Section 680.43(B)(1)(b) permits GFCI protected luminaires over indoor installed hot tubs to be installed at a minimum height of 7 ft. The intent of this rule is to protect persons from an electrical shock hazard. Incorrect answer. Please choose another answer.

6.	Where a motor of more than 1 horsepower has a temperature rise of 50 deg. C indicated on the nameplate, for the purpose of selecting the overload device, this device shall be selected to trip at NO more than _____ of the motor's full-load ampere rating. (Assume no exceptions or modifications are necessary.)
		A. 100 percent
		B. 115 percent
		C. 125 percent
		D. 130 percent
Where a motor has a temperature rise of 50C marked on the nameplate, for the purpose of selecting the overload device, Section 430.32(A)(1) requires this device shall be selected to trip at not more than 115% of the motor nameplate full-load current rating. Motors are required to be protected from overloads and the basic premise of this rule is that the operation of a motor in excess of its normal full-load rating for a prolonged period of time causes damage or dangerous overheating that may start a fire. Overload protection is intended to protect the motor and the system components from damaging overload currents. Incorrect answer. Please choose another answer.

7.	The MINIMUM burial depth for conduit or cables installed under an airport runway, concourse or tarmac is _____ .
		A. 1 feet
		B. 2 feet
		C. 3 feet
		D. 1 foot
Table 300.5 indicates all wiring methods installed under airport runways and adjacent areas to be placed at a depth of not less than 18 in. This required depth reduces the risk of damaging the conductors and raceways that may be caused by heavy aircraft traffic. Incorrect answer. Please choose another answer.

8.	Liquidtight flexible metal conduit (LFMC) is approved for use as an equipment grounding conductor if it does NOT exceed _____ in length.
		A. 10 feet
		B. 12 feet
		C. 6 feet
		D. 8 feet
Section 250.118(6)d permits liquidtight flexible metal conduit (LFMC) for use as an equipment grounding conductor if it does not exceed 6 feet in length. However, when LFMC is used to connect equipment where flexibility is necessary due to the anticipated movement of the equipment after installation, Section 250.118(6)e mandates an equipment grounding conductor to be installed regardless of the length of the LFMC. Incorrect answer. Please choose another answer.

9.	In dwelling units and guest rooms of hotels and motels, overcurrent protection devices shall NOT be located in _____.
		A. bedrooms
		B. bathrooms
		C. kitchens
		D. hallways
Overcurrent protection devices are not permitted to be located in bathrooms of dwelling units and guest rooms of hotel and motels. Reference Section 240.24(E). Incorrect answer. Please choose another answer.

10.	Determine the MINIMUM size THWN copper branch-circuit conductors permitted to supply an ac motor when given the following related information: * all terminations are rated for 75C * nameplate current rating is 25 amperes * 15 minute rated motor * short-time duty
		A. 12 AWG
		B. 10 AWG
		C. 8 AWG
		D. 6 AWG
In compliance with Section 430.22(E), for motors that are not continuous duty, the motor nameplate currents and Table 430.22(E) are used to determine the branch- circuit ampacity. Table 430.22(E) shows the duty-cycle service for a 15 minute, short-time duty motor and indicates the nameplate current rating of 25 amperes is to multiplied by 120% to determine the ampacity of the conductors. FLC of motor = 25 amperes x 120% = 30 amperes Size 10 AWG THWN copper conductors with an allowable ampacity of 35 amperes should be selected from Table 310.15(B)(16). Incorrect answer. Please choose another answer.

11.	The conductors in multiconductor portable cables, of over 600 volts nominal, used to connect mobile equipment and machinery, shall be at least size _____ copper or larger and employ flexible stranding.
		A. 8 AWG
		B. 10 AWG
		C. 12 AWG
		D. 14 AWG
Section 400.31(A) applies to multiconductor portable cables, over 600 volts, used to connect mobile equipment and machinery. The conductors shall be 12 AWG or larger and shall employ flexible stranding. Incorrect answer. Please choose another answer.

12.	Apply no exceptions and determine the MAXIMUM standard size nontime-delay fuse permitted for branch-circuit, short-circuit, and ground-fault protection for an ac motor where given the following related information: * 2 hp - 120-volts, single-phase * continuous-duty * nameplate current rating - 22 amperes * no code letter
		A. 70 amperes
		B. 80 amperes
		C. 85 amperes
		D. 90 amperes
To comply with the rules specified in Section 430.6(A)(1), for single-phase, general motor applications, the ampere rating of the overcurrent protective devices are to be based on the ampere values expressed in Table 430.248. This table shows the motor to have a full-load running current of 24 amperes. Table 430.52 indicates where nontime delay fuses are used to protect a single-phase motor they are to have a rating of not more than 300% of the motor FLC. FLC of motor - 24 amperes x 300% = 72 amperes In this situation where exceptions are not applied, you must go down to the next standard size nontime-delay fuse with an ampere rating of 70 amperes. [240.6(A)] Incorrect answer. Please choose another answer.

13.	Which of the following listed is NOT permitted for use as both controller and disconnecting means for a motor?
		A. inverse time circuit breaker
		B. instantaneous-trip circuit breaker
		C. oil switch
		D. air-break switch
Where used as both controller and disconnecting means for a motor, Sections 430.111(B)(1),(2)&(3) recognizes the permitted use of an oil switch, an air-break switch, and an inverse time circuit breaker, but the use of an instantaneous-trip circuit breaker is not permitted. It is the intent of Section 430.111 to permit omission of an additional device to serve as a disconnecting means. Incorrect answer. Please choose another answer.

14.	Where located in Class I, Division 1 locations, transformers containing oil or a liquid that will burn shall be _____.
		A. enclosed in a fence
		B. installed in vaults only
		C. identified for Class I locations
		D. installed in a fire-resistant room
As mandated by Section 501.100(A)(1), where transformers containing oil or a liquid that will burn are located in a Class I, Division 1 location, they shall be installed in vaults only. The purpose of this rule is to prevent the spread of burning oil to other combustible materials in the event of a fire or an explosion. Incorrect answer. Please choose another answer.

15.	Where a conduit or tubing nipple has a length of NOT more than ____ it is not necessary to derate for the number of current-carrying conductors contained in the nipple.
		A. 42 inches
		B. 36 inches
		C. 24 inches
		D. 30 inches
Section 310.15(B)(3)(2) states adjustment factors shall not apply to conductors in raceways having a length not exceeding 24 in. This section recognizes where conductors are installed in short sections of raceways of not over 24 inches in length, the heating effect caused by the number of current-carrying conductors in the raceway is very little and the reduction of the ampacity of the conductors is insignificant. Incorrect answer. Please choose another answer.

16.	A junction box to be installed will contain the following: * three - size 6 AWG ungrounded conductors * three - size 6 AWG grounded conductors * one - size 8 AWG equipment grounding conductor * three - size 12 AWG ungrounded conductors * three - size 12 AWG grounded conductors * one - size 12 equipment grounding conductor * four - internal clamps The junction box is required to have a volume of at LEAST _____ .
		A. 51.50 cubic inches
		B. 53.75 cubic inches
		C. 46.50 cubic inches
		D. 56.50 cubic inches
When installing conductors of different sizes in junction boxes, the total box volume required is determined by adding the individual volumes of the box components. Section 314.16 provides the requirements, and identifies the allowances for the number of conductors permitted to be housed within a box. Table 314.16(B) shows the volume, in cubic inches of the individual conductors. Each ungrounded or grounded conductor that enters the box and terminates or spliced within the box shall be counted once. [314.16(B)(1)] Internal box clamps are to be counted as one conductor, based on the largest conductor present in the box. [314.16(B)(2)] Equipment grounding conductors, one or more, are counted as one conductor, based on the largest equipment grounding conductor present in the box. [314.16(B)(5)] Size 6 AWG ungrounded conductors - 3 x 5.00 cu. in. = 15.00 cu. in. Size 6 AWG grounded conductors - 3 x 5.00 cu. in. = 15.00 cu. in. Size 8 AWG grounding conductor - 1 x 3.00 cu. in. = 3.00 cu. in. Size 12 AWG ungrounded conductors - 3 x 2.25 cu. in. = 6.75 cu. in. Size 12 AWG grounded conductors - 3 x 2.25 cu. in. = 6.75 cu. in. Size 12 AWG grounding conductor - -0- internal clamps - 1 x 5.00 cu. in. = 5.00 cu. in. TOTAL = 51.50 cu. in. Incorrect answer. Please choose another answer.

17.	When a fiber optic cable or communications raceway passes through a fire-resistant-rated partition or wall it must be _____.
		A. removed
		B. firestopped
		C. shielded
		D. sleeved
Section 770.26 requires openings around penetrations of optical fiber cables and communications raceways through fire-resistant-rated partitions to be firestopped using approved methods. This rule is in place so that the possible spread of fire will not be increased if a fire occurs. Incorrect answer. Please choose another answer.

18.	With respect to service-drop conductors and open overhead wiring of not more than 750-volts to ground, the MINIMUM vertical clearance that must be maintained from the base of a swimming pool diving board and the conductors is _____ .
		A. 14 feet
		B. 16 feet
		C. 20 feet
		D. 22 feet
Table 680.8(A) and Figure 680.8(A) illustrate where service-drop conductors and open overhead wiring from 0-750 volts cross above a swimming pool, a clearance of not less than 22 ft. must be maintained from the base of the diving board and the conductors. The intent of these clearances is to prevent inadvertent contact with the conductors when using skimmers with aluminum handles when cleaning the pool. Incorrect answer. Please choose another answer.

19.	The life safety branch of the essential electrical system of a health care facility shall provide power to _____ . I. automatic doors used for building egress II. illuminate electrical equipment rooms
		A. I only
		B. II only
		C. both I and II
		D. neither I nor II
The purpose of Section 517.32(H) is to provide an automatic means of egress from a health care facility in the event of an emergency. Incorrect answer. Please choose another answer.

20.	When a building contains _____, the building may have more than one service without special permission being granted from the local authority having jurisdiction.
		A. exit lights
		B. fire pumps
		C. computers
		D. four-hour rated fire-resistant walls
The general requirement of Section 230.2 is that a building shall be supplied by only one service. However, Section 230.2(A)(1) permits an additional service to be provided to supply fire pumps. The concept of this rule is to maintain fire protection upon interruption of the normal service. Incorrect answer. Please choose another answer.

21.	In general, service-drop conductors shall have a vertical clearance of at LEAST _____ above the roof surface of a building having no overhang.
		A. 10 feet
		B. 12 feet
		C. 14 feet
		D. 8 feet
In order to prevent the potential for personnel making inadvertent contact with service-drop conductors, Section 230.24(A) requires a vertical clearance of not less than 8 ft. be maintained from the conductors to the roof surface. Incorrect answer. Please choose another answer.

22.	Under general conditions, the phase arrangement on the three-phase busses for a three-phase ac panelboard or switchboard shall be A, B, C, as viewed from _____. I. back to front II. bottom to top
		A. I only
		B. II only
		C. neither I nor II
		D. both I and II
Section 408.3(E)(1) addresses the phase arrangement of 3-phase buses of ac panelboards and switchboards. The phase arrangement on 3-phase busses shall be A, B, C, from front to back, top to bottom, or left to right as viewed from the front of the switchboard or panelboard. The purpose of the rule is to standardize the phase arrangement of 3-phase ac equipment used in the electrical industry. Incorrect answer. Please choose another answer.

23.	Where a dwelling unit is provided with a deck or porch that is accessible from inside the dwelling, at least one 125-volt, 15- or 20-ampere receptacle outlet is required to be installed accessible from the deck or porch. This receptacle is required to be located at a height of NOT more than _____ above the deck or porch surface.
		A. 18 inches
		B. 24 inches
		C. 5 feet
		D. 6 feet
The intent of Section 210.52(E)(3) is to provide a receptacle on the porch or deck of dwellings so that the occupants have access to electrical power without the need of extension cords passing through doorways, which may cause a tripping or electrical hazard. Incorrect answer. Please choose another answer.

24.	Which of the following listed raceways is NOT permitted for use of enclosing control wiring for electric motor-driven fire pumps?
		A. flexible metal conduit (FMC)
		B. liquidtight flexible metal conduit (LFMC)
		C. liquidtight flexible nonmetallic conduit (LFNC)
		D. intermediate metal conduit (IMC)
Section 695.14(E) permits liquidtight flexible metal conduit (LFMC), liquidtight flexible nonmetallic conduit (LFNC) and intermediate metal conduit (IMC) to be used as wiring methods for use of enclosing control wiring for electric motor-driven fire pumps. Flexible metal conduit (FMC) is not approved for such use. Incorrect answer. Please choose another answer.

25.	For indoor installations about switchboards and panelboards, the space equal to the width and depth of the equipment and extending from the floor to a height of 6 feet above the equipment or to the structural ceiling is known as the _____.
		A. dedicated electrical space
		B. headroom space
		C. personnel space
		D. equipment clearance space
As covered in Section 110.26(E)(1)(a), the dedicated electrical space is required to be clear of piping, ducts, leak protection apparatus, or equipment foreign to the electrical installation. Plumbing, heating, ventilation and air-conditioning ducts must not be located in this dedicated electrical space. Associated electrical equipment such as busways, raceways, conduits and cables are permitted to enter equipment through this zone. Incorrect answer. Please choose another answer.

26.	A grounding electrode conductor that is the sole connection to a made grounding electrode, such as a driven ground rod, pipe or buried plate, shall NOT be required to be larger than size _____ copper conductor.
		A. 1/0 AWG
		B. 6 AWG
		C. 4 AWG
		D. 3/0 AWG
Section 250.66(A) permits that portion of a grounding electrode conductor that is the sole connection to a made grounding electrode such as a driven ground rod, pipe or buried plate, to be not larger than 6 AWG copper. Incorrect answer. Please choose another answer.

27.	For solar photovoltaic systems, locating the system grounded connection point as close as practicable to the photovoltaic source better protects the system from _____.
		A. excessive voltage drop
		B. excessive resistance in the grounding system
		C. voltage surges due to the lightning
		D. voltage surges due to ground-faults
The Informational Note of Section 690.42, indicates locating the grounding connection point as close as practicable to the photovoltaic source better protects the system from voltage surges due to lightning. Incorrect answer. Please choose another answer.

28.	Disregarding exceptions, the MINIMUM size grounded or ungrounded conductors permitted to be connected in parallel are _____.
		A. 6 AWG
		B. 1 AWG
		C. 1/0 AWG
		D. 2/0 AWG
As per Section 310.10(H)(1), phase conductors, neutral, or grounded conductors shall be permitted to be connected in parallel only in sizes 1/0 AWG or larger. Incorrect answer. Please choose another answer.

29.	A phase converter is an electrical device that converts _____.
		A. ac voltage to dc voltage
		B. 3-phase power to single-phase power
		C. single-phase power to 3-phase power
		D. ungrounded systems to grounded systems
Section 455.2 defines a phase converter as an electrical device that converts single- phase power to 3-phase power. Phase converters are commonly used to supply 3-phase motor loads in locations where only single-phase power is available from the local utility. Electrical installations on farms and in other rural areas are examples of such locations. Incorrect answer. Please choose another answer.

30.	Which one of the following wiring methods is permitted to be installed in ducts specifically fabricated for environmental air?
		A. rigid polyvinyl chloride conduit (PVC)
		B. electrical metallic tubing (EMT)
		C. armored cable (AC)
		D. nonmetallic sheathed cable (NM)
Section 300.22(B) applies to sheet metal ducts and other ducts specifically constructed to transport environmental air. The rules in this section limits the use of materials that would contribute smoke and products of combustion during a fire in an area that handles environmental air. This section lists the wiring methods permitted to be installed in environmental air ducts. The question had only electrical metallic tubing (EMT) approved for such use. Incorrect answer. Please choose another answer.

31.	An adjustable overload protection device protecting a single phase, 240-volt, continuous-duty, 5 hp, ac motor with a FLA rating of 26 amperes and a temperature rise of 50 deg. C marked on the nameplate, shall be selected to trip at NOT more than _____ . (Consider the value you select will enable the motor to start without tripping and modification of this value is not necessary.)
		A. 29.9 amperes
		B. 32.2 amperes
		C. 33.8 amperes
		D. 36.4 amperes
For general motor applications, separate motor overload protection is to be based on the motor nameplate current rating and not on the full-load running current value as given in the NEC tables. In compliance with Section 430.32(A)(1), the overload device shall be selected to trip or shall be rated at no than 115% of the motor nameplate full-load current rating where the motor has a temperature rise greater than 40C. Nameplate ampere rating of motor = 26 amperes x 115% = 29.9 amperes Incorrect answer. Please choose another answer.

32.	In Class II, Division 1 locations, where pendant mounted luminaires are suspended by rigid metal conduit (RMC) and a means for flexibility is not provided, the RMC shall have a length of NOT more than _____.
		A. 12 inches
		B. 18 inches
		C. 24 inches
		D. 30 inches
As specified in Section 502.130(A)(3), in Class II, Division 1 locations, where rigid metal conduit (RMC) supports pendant suspended luminaires and a means of flexibility is not provided, the RMC shall have a length of not more than 12 inches. Incorrect answer. Please choose another answer.

33.	A commercial kitchen is to have the following cooking related equipment installed: * one - 14 kW range * one - 5.0 kW water heater * one - 0.75 kW mixer * one - 2.5 kW dishwasher * one - 2.0 kW booster heater * one - 2.0 kW broiler Determine the demand load, in kW, after applying the demand factors for the kitchen equipment.
		A. 19.00 kW
		B. 26.25 kW
		C. 18.38 kW
		D. 17.06 kW
It is permissible to calculate the demand load for related commercial cooking equipment in accordance with Table 220.56. Commercial electric cooking appliances are sometimes used continuously from morning until night, therefore the demand factors for commercial applications are not as generous as those permitted for dwelling units. 14.00 kW - range 5.00 kW - water heater 0.75 kW - mixer 2.50 kW - dishwasher 2.00 kW - booster heater 2.00 kW - broiler 26.25 kW - total connected load x 65% = 17.06 kW *NOTE - However, Section 220.56 states the demand shall not be less than the two largest pieces of equipment. 14.00 kW + 5.00 kW = 19 kW demand Incorrect answer. Please choose another answer.

34.	In areas of a minor repair commercial garage where gaseous liquids and fuels are not transferred, any unventilated pit or below-grade work area is classified as a _____ hazardous location.
		A. Class I, Division 2
		B. Class II, Division 1
		C. Class II, Division 2
		D. Class I, Division 1
The condition specified in Section 511.3(D)(3)(b) applies to facilities that primarily do oil and filter changes and lubrication-type services, not the transfer of fuel. Where the pit below floor level is not provided with ventilation, this below-grade work area is classified as a Class I, Division 2 location. Incorrect answer. Please choose another answer.

35.	Where a motor controller enclosure is located outdoors and is subject to be exposed to sleet, it shall have a MINIMUM rating of _____, where the controller mechanism is required to be operable when ice covered.
		A. Type 3
		B. Type 3S
		C. Type 3R
		D. Type 3SX
Table 110.28 indicates where a motor controller is located outdoors and is exposed to sleet, it shall have a minimum rating of 3S, where the controller mechanism is required to be operable when ice covered. This enclosure selection table is in place to ensure installers select the proper enclosure that provides a degree of protection against specific environmental conditions. Incorrect answer. Please choose another answer.

36.	When buried raceways pass under a commercial driveway or parking lot the MINIMUM cover requirements _____ .
		A. decrease if installed in rigid metal conduit (RMC)
		B. do not change in regard to wiring methods used
		C. shall be increased for direct-buried cables
		D. shall be increased, decreased or remain the same, depending on the wiring method used
Due to the amount of heavy vehicle traffic across a commercial driveway or parking lot, Table 300.5 specifies the minimum cover requirements to be 24 in. regardless of the type of wiring method used. Incorrect answer. Please choose another answer.

37.	The National Electrical Code requires ventilation of a battery room where batteries are being charged to prevent _____.
		A. battery corrosion
		B. electrostatic charge
		C. deterioration of the building steel
		D. an accumulation of an explosive mixture
The fumes given off by some storage batteries are very corrosive and can produce an explosive mixture. To prevent this from happening, Section 480.9(A), requires ventilation of a battery room to prevent the accumulation of an explosive mixture. The ventilation method is not necessary to be mechanical. Hydrogen disperses rapidly and requires little air movement to prevent accumulation. Since hydrogen is lighter than air and tends to concentrate at ceiling level, a form of ventilation should be provided near the ceiling level. Ventilation methods may be a fan, roof ridge vent, or louvered area. Incorrect answer. Please choose another answer.

38.	For other than Design B energy-efficient motors, where the setting specified in Table 430.52 of the NEC is not sufficient for the starting current of the motor, the setting of an instantaneous trip circuit breaker shall be permitted to be increased, but in NO case exceed _____ of the full-load current of the motor.
		A. 1300 percent
		B. 1700 percent
		C. 1100 percent
		D. 800 percent
As permitted by Exception No. 1 to the mandates covered in Section 430.52(C)(3), for other than Design B energy-efficient motors, where the setting specified in Table 430.52 is not sufficient for the starting current of the motor, the setting of an instantaneous trip circuit breaker may be permitted to be increased at a value not to exceed 1300% of the motor full-load current. Incorrect answer. Please choose another answer.

39.	Where given the following related information, determine the MAXIMUM standard size overcurrent protection required for the primary and secondary side of a transformer, when both primary and secondary overcurrent protection is to be provided. * 150 kVA rating * Primary - 480-volts, 3-phase, 3-wire * Secondary - 208Y/120-volts, 3-phase, 4-wire
		A. Primary - 500 amperes, Secondary - 500 amperes
		B. Primary - 450 amperes, Secondary - 600 amperes
		C. Primary - 500 amperes, Secondary - 450 amperes
		D. Primary - 450 amperes, Secondary - 500 amperes
As per Section 450.3(B), to determine the overcurrent protection required for a transformer of less than 600 volts, the protection shall be provided in accordance with Table 450.3(B). First determine the full-load current rating of the transformer by applying the 3-phase current formula, then multiply by the values shown in Table 450.3(B). (Primary) I = VA I = 150,000 = 150,000 = 180 amps x 250% = 450 amperes E x 1.732 480 x 1.732 831.36 (Secondary) I = VA I = 150,000 = 150,000 = 416 amps x 125% = 520 amperes E x 1.732 208 x 1.732 36.25 Since this full-load current value does not correspond to a standard size overcurrent device, and it is permitted to go up to the next standard size, a 600 ampere rated overcurrent protective device is permitted. Incorrect answer. Please choose another answer.

40.	Where a flat cable assembly, Type FC, is installed LESS than _____ above the floor level or fixed working platform, it shall be protected by a cover identified for the use.
		A. 6 feet
		B. 7 feet
		C. 8 feet
		D. 10 feet
The intent of Section 322.10(3) is to protect the flat cable assembly from physical damage. Incorrect answer. Please choose another answer.

41.	Apply no exceptions and determine the MAXIMUM standard size time-delay fuses permitted to be used for branch-circuit, short-circuit, and ground-fault protection for a 15 hp, 480-volt, three-phase, continuous-duty, wound rotor motor.
		A. 30 amperes
		B. 35 amperes
		C. 40 amperes
		D. 50 amperes
In compliance with the motor rules specified in Section 430.6(A)(1), for 3-phase, general motor applications, the ampere rating of the overcurrent protective devices are to be based on the motor full-load running current value given in Table 430.250. The table shows the motor to have a full-load current rating of 21 amperes. The actual rating or setting of the overcurrent protection devices are to be sized in accordance with Table 430.52. FLC of motor = 21 amperes x 150% = 31.50 amperes In this question exceptions are not to be applied, therefore you are required to go down to the next standard size fuses, indicated in Section 240.6(A), having a rating of 30 amperes. Incorrect answer. Please choose another answer.

42.	In general, when conductors of different insulation ratings are installed in a common raceway and the voltage is 1000 volts or less, the NEC requires _____ .
		A. all conductors shall have an insulation rating equal to at least the maximum circuit voltage applied to any conductor in the raceway
		B. the conduit allowable fill to be limited to 31 percent
		C. all conductors within the raceway shall have a temperature rating of 75C
		D. the insulation of the lower rated conductors to be identified with blue or yellow colors
The intent of Section 300.3(C)(1) is to make it clear that the maximum circuit voltage in the raceway, not the maximum insulation voltage rating of the conductors, is what determines the minimum voltage rating required for the insulation of conductors for systems of 1000 volts or less. Incorrect answer. Please choose another answer.

43.	Where a service-entrance conduit having a length of six (6) ft. contains four (4) size 2 AWG THWN copper current-carrying conductors, and ambient temperature is not to be taken into consideration, each of the conductors have an allowable ampacity of _____.
		A. 115 amperes
		B. 110 amperes
		C. 100 amperes
		D. 92 amperes
Prior to derating, Table 310.15(B)(16) shows the ampacity of size 2 AWG THWN copper conductors to be 115 amperes, which is multiplied by 0.8 [selected from the adjustment factors found in Table 310.15(B)(3)(a)]. Therefore, the allowable ampacity of the conductors is reduced to 92 amperes. 115 amperes x .8 = 92 amperes Incorrect answer. Please choose another answer.

44.	A 6,000 sq. ft. bank building is to be constructed and the number of general-purpose receptacles to be installed in the building is yet to be determined; the building will also have an electric sign. Determine the MINIMUM number of 120-volt, 20-ampere branch circuits required for the lighting, receptacles and the sign.
		A. 12
		B. 13
		C. 14
		D. 15
To solve this problem, take into consideration the following: 1) As per Article 100, lighting circuits for a commercial building such as a bank are considered continuous loads. 2) In compliance with Section 210.19(A)(1), branch-circuits must have an allowable ampacity of not less than 125% of the continuous loads to be served. 3) General-use receptacles are not considered continuous loads. 4) Electric signs are to be on a separate dedicated circuit. Section 600.5(A) 5) Minimum lighting loads are to be calculated in accordance with the values given on Table 220.12. 6) As per Section 220.14(K)(2), when the number of receptacles to be installed is unknown, an additional one (1) VA per sq. ft. is to be added to the general- lighting load. Therefore, do the math as shown to determine the minimum number of 120-volt, 20-ampere branch circuits required for this building. 6,000 sq. ft. x 3.5 VA = 21,000 VA x 125% = 26,250 VA (lighting) 6,000 sq. ft. x 1.0 VA = 6,000 VA (receptacles) 32,250 VA (receptacles & lighting) 120 volts x 20 amperes = 2,400 VA of one circuit 32,250 VA (load) 2,400 VA (one circuit) = 13.4 circuits = 14 circuits 14 circuits (lighting & receptacles) + 1 sign circuit = 15 circuits total Incorrect answer. Please choose another answer.

45.	Unless otherwise provided, Type AC cable shall be supported at intervals NOT exceeding _____ where installed on or across framing members.
		A. 8 feet
		B. 5 feet
		C. 4 feet
		D. 6 feet
The intent of Section 320.30(B) is to ensure Type AC cable is adequately supported where installed on or across framing members. Incorrect answer. Please choose another answer.

46.	Where a 200 kW, 3-phase, 480Y/277-volt, 4-wire back-up generator is installed at a commercial building and the design and operation of the generator does not prevent overloading, determine the MINIMUM size THWN copper conductors required from the generator terminals to the first distribution device(s) containing overcurrent protection.
		A. 250 kcmil
		B. 300 kcmil
		C. 400 kcmil
		D. 500 kcmil
To determine the allowable ampacity of the conductors required from the terminals of the generator to the first overcurrent device, first apply the 3-phase current formula to find the full-load current rating of the generator: I = kW x 1,000 I = 200 x 1,000 = 200,000 = 240.56 amperes (FLC) volts x 1.732 480 x 1.732 831.36 Next, as per Section 445.13, multiply by 115%: 241 amperes x 115% = 277 amperes (required ampacity of conductors) Finally, size 300 kcmil THWN conductors with an allowable ampacity of 285 amperes should be selected from Table 310.15(B)(16). Incorrect answer. Please choose another answer.

47.	All switches and circuit breakers located in wet locations of recreational vehicle parks shall be listed _____.
		A. weatherproof
		B. watertight
		C. waterproof
		D. raintight
Section 551.78(A) requires all switches and circuit breakers located in wet locations of a RV park to be weatherproof. This rule is to ensure the equipment is sufficiently protected when exposed to weather conditions and water. Incorrect answer. Please choose another answer.

48.	A dwelling unit to be built will have 1,400 sq. ft. of livable space on the main floor, a 1,400 sq. ft. basement (unfinished but adaptable for future use), a 200 sq. ft. open porch and a 600 sq. ft. garage. Determine the MINIMUM number of 15- ampere, 120-volt general lighting branch-circuits required for the dwelling.
		A. four
		B. five
		C. six
		D. seven
To determine the minimum number of 15-ampere, 120-volt general lighting circuits required for the dwelling, refer to Section 220.12 and note that open porches and garages are not to be included in the calculation. A unit load not less than specified in Table 220.12 shall constitute the minimum lighting load. First, determine the usable square feet of the building and multiply by 3 VA as shown in Table 220.12: 1,400 sq. ft. + 1,400 sq. ft. = 2,800 sq. ft. x 3 VA = 8,400 VA Next, find the VA of one circuit by multiplying 120 volts by 15 amperes: 120 volts x 15 amperes = 1,800 VA of one circuit Then, divide the lighting load (8,400 VA) by the VA of one circuit (1,800 VA): 8,400 VA (load) = 4.6 = 5 circuits total 1800 VA (one circuit) Incorrect answer. Please choose another answer.

49.	In order to determine the proper size of a junction box or pull box containing size 4 AWG THWN copper conductors, the volume allowance, in cubic inches, required per ungrounded and grounded conductor is _____.
		A. 5.00 cubic inches
		B. 5.50 cubic inches
		C. 6.25 cubic inches
		D. none of these
For the purpose of determining box size and permitted fill, Table 314.16(B) shows the volume allowance, in cubic inches, required per conductor from sizes 18 AWG to 6 AWG. However, when sizing pull and junction boxes housing conductors of size 4 AWG and larger, the required box dimension is to be calculated based on the diameter of the raceways entering and exiting the enclosure and the rules covered by Section 314.28 are to be applied. Incorrect answer. Please choose another answer.

50.	Noncombustible surfaces, such as drywall or plasterboard that are damaged around boxes having a flush-type cover or faceplate, shall be repaired so there will be no gaps greater than _____ at the edge of the box.
		A. 1/8 in.
		B. 1/4 in.
		C. 3/8 in.
		D. in.
Section 314.21 requires noncombustible surfaces that are damaged around boxes to be repaired so there will be no gaps greater than 1/8 in. around the box. Incorrect answer. Please choose another answer.

51.	Thermal insulation is not permitted to be installed above a recessed luminaire or WITHIN _____ of the recessed luminaire's enclosure, wiring compartment, ballast, transformer, LED driver or power supply, unless the luminaire is identified as Type IC for insulation contact.
		A. 3 inches
		B. 4 inches
		C. 6 inches
		D. 8 inches
A listed Type IC recessed luminaire is provided with thermal protection to deactivate the lamp should the luminaire be mislamped so that it overheats. Unless a recessed luminaire is listed as Type IC, Section 410.116(B) requires thermal insulation to not be installed above a recessed luminaire or within 3 in. of the recessed luminaire's enclosure, wiring compartment, ballast, transformer, LED driver or power supply. Incorrect answer. Please choose another answer.

52.	What is the MINIMUM height allowed for a fence enclosing an outdoor installation of 2,400-volt electrical equipment?
		A. 6 feet
		B. 7 feet
		C. 8 feet
		D. 9 feet
The intent of the rules set forth by Section 110.31 is to ensure enclosures housing electrical equipment over 600 volts is accessible to qualified persons only and to deter persons that are not qualified. Therefore, where a fence is used to enclose an outdoor installation of 2,400 volt electrical equipment, the fence is required to be not less than 7 ft. in height. Incorrect answer. Please choose another answer.

53.	The MINIMUM size copper conductor permitted for use as an equipment grounding conductor for secondary circuits of an instrument transformer is ___.
		A. 8 AWG
		B. 10 AWG
		C. 12 AWG
		D. 14 AWG
Section 250.178 requires the minimum size copper equipment grounding conductor required for grounding secondary circuits of an instrument transformer, such as a current transformer, to be 12 AWG. Incorrect answer. Please choose another answer.

54.	Storage batteries used as a source of power for emergency systems shall be of a suitable rating and capacity to supply and maintain the total load for at LEAST _____.
		A. 1/2 hour
		B. 1 hour
		C. 1 1/2 hours
		D. 2 hours
As mandated by Section 700.12(A), storage batteries used as a source of power for emergency systems shall be of a suitable rating and capacity to maintain the total load for at least 1 hours, without the voltage applied to the load falling below 87 percent of normal. Incorrect answer. Please choose another answer.

55.	Receptacle outlets installed in floors of dwelling units shall not be counted as part of the required number of receptacle outlets, unless located within at LEAST _____ of the wall.
		A. 12 inches
		B. 18 inches
		C. 24 inches
		D. 30 inches
Because of the need to provide a sufficient number of general-use receptacles for the cord-and-plug connected appliances in dwelling units, those receptacle outlets installed in floors more than 18 in. from the wall, are not to be counted as part of the required number of receptacle outlets. Refer to Section 210.52(A)(3). Incorrect answer. Please choose another answer.

56.	Given: A 32 unit apartment complex to be constructed will have an 8 kW household electric range in each unit. Use the optional method of calculation and determine the demand load, in kW, on the ungrounded service-entrance conductors for the electric ranges.
		A. 22.00 kW
		B. 47.00 kW
		C. 89.52 kW
		D. 79.36 kW
In compliance with Section 220.84(C)(3), when using the optional method of calculation for multifamily dwellings, the nameplate ratings of the appliances are to be used and the demand factors of Table 220.84 apply. 8 kW x 32 units x .31 (demand factor) = 79.36 kW Incorrect answer. Please choose another answer.

57.	Where the service of a building is provided with ground-fault protection, the MAXIMUM trip time-delay shall be _____ for ground-faults equal to or greater than 3,000 amperes.
		A. one second
		B. five seconds
		C. 30 seconds
		D. one minute
Ground-fault protection of services is designed to provide protection from line-to- ground-faults that occur on the load side of the service disconnecting means. The requirements of Section 230.95(A) place a restriction on ground fault currents greater than 3,000 amperes and limits the duration of the fault to be not more than 1 second. This time restriction limits the amount of damage done by an arcing fault, which is directly proportional to the time the arcing fault is allowed to burn. Incorrect answer. Please choose another answer.

58.	Each grounding electrode plate shall expose NOT less than _____ of surface to exterior soil.
		A. 1 sq. ft.
		B. 1 sq. ft.
		C. 2 sq. ft.
		D. 3 sq. ft.
To ensure the effectiveness of a grounding electrode plate, each grounding electrode plate shall expose not less than 2 sq. ft. of surface to exterior soil. Refer to Section 250.52(A)(7). Incorrect answer. Please choose another answer.

59.	Underground service conductors that are not encased in concrete and buried 18 inches or more below grade shall have their location identified by a warning ribbon placed at LEAST _____ above the underground installation.
		A. 6 inches
		B. 8 inches
		C. 12 inches
		D. 18 inches
The warning ribbon required in Section 300.5(D)(3) is to be placed in the trench at least 12 inches above the underground installation. This requirement reduces the risk of an accident, an electrocution, or an arc-flash incident during excavation near underground service conductors that are not encased in concrete. Incorrect answer. Please choose another answer.

60.	Determine the MAXIMUM standard size time-delay fuses permitted for branch-circuit, short-circuit and ground-fault protection for a 50 hp, 3-phase, 480-volt, induction-type motor with a full-load ampere rating of 61 amperes marked on the nameplate. Apply no exceptions.
		A. 100 amperes
		B. 110 amperes
		C. 115 amperes
		D. 125 amperes
Section 430.6(A)(1) indicates to size the overcurrent protection for a 3-phase 50 hp, 480-volt, motor used in a general application, the full-load running current value, 65 amperes, shown on Table 430.250 shall be used. For 3-phase motors, Table 430.52 requires the rating of time-delay fuses to be no more than 175% of the FLC of the motor. FLC of motor - 65 amperes x 175% = 113.75 amperes Since exceptions were not applicable on this question, you should have selected fuses with a standard rating of 110 amperes from Section 240.6(A). Incorrect answer. Please choose another answer.

61.	Given: A 100 kVA, dry-type transformer with a 4,160-volt primary is to be installed indoors at an industrial occupancy. The transformer must have a clearance of at LEAST _____ from combustible material.
		A. 6 inches
		B. 10 inches
		C. 18 inches
		D. 12 inches
Where installed indoors, to reduce the risk of a fire, dry-type transformers having a rating of 112 kVA or less are to have a separation of at least 12 in. from combustible material. Refer to Section 450.21(A). Incorrect answer. Please choose another answer.

62.	For track lighting installed in a retail store, a MAXIMUM of two (2) feet of lighting track or fraction thereof shall be considered _____.
		A. 150 VA
		B. 180 VA
		C. 200 VA
		D. 100 VA
Section 220.43(B) is meant to be used for load calculations. This section requires a load of 150 VA is to be used for every two (2) feet of lighting track or fraction thereof. Incorrect answer. Please choose another answer.

63.	Where fixed wiring above bulk fuel storage tanks is installed in PVC conduit, the PVC shall be _____.
		A. Schedule 20
		B. Schedule 40
		C. Schedule 80
		D. Schedule 100
As per Section 515.7(A), where PVC conduit is used as a fixed wiring method above bulk fuel storage tanks, the PVC shall be Schedule 80 PVC conduit. Incorrect answer. Please choose another answer.

64.	Where multioutlet assemblies are installed in an office building where the cord-connected equipment is likely to be used simultaneously, each one (1) ft. of multioutlet assembly or faction therof shall be considered as one outlet of NOT less than _____.
		A. 90 VA
		B. 100 VA
		C. 150 VA
		D. 180 VA
The requirement of Section 220.14(H)(2) states that where appliances are likely to be used simultaneously, each foot of multioutlet assembly is to be considered as one outlet rated 180 volt-amperes. Incorrect answer. Please choose another answer.

65.	In general, 4 inch wide underfloor raceways shall have a covering of wood or concrete of NOT less than _____ above the raceway.
		A. 1/2 in.
		B. 3/4 in.
		C. 1 in.
		D. 1 1/4 in.
In order to provide adequate protection of underfloor raceways, Section 390.4(A) requires 4 in. wide raceways to have a covering of wood or concrete not less than 3/4 in. above the raceway. Incorrect answer. Please choose another answer.

66.	Where not in excess of 600 volts, service-drop conductors over an orchard shall have a vertical clearance from final grade of NOT less than _____.
		A. 12 feet
		B. 18 feet
		C. 15 feet
		D. 10 feet
Where aerial service-drop conductors of not over 600 volts cross above an orchard they are required to have a vertical clearance of not less 18 ft. from final grade. The intent of the requirements listed in Section 230.24(B)(4) is to protect the conductors from physical damage and to protect persons from accidental contact with the conductors. Incorrect answer. Please choose another answer.

67.	Where a hot tub is installed outdoors at a dwelling unit, what is the MAXIMUM distance a 15- or 20-ampere, 125-volt receptacle is permitted to be located from the hot tub?
		A. 20 feet
		B. 15 feet
		C. 10 feet
		D. 5 feet
As per Section 680.42, the rules that govern outdoor installations for a spa or hot tub shall comply with the provisions that cover permanently installed swimming pools. In compliance with Section 680.22(A)(1), where a spa or hot tub is installed at a dwelling unit, at least one (1) 125-volt, 15- or 20-ampere receptacle is to be located not more than 20 ft. from the inside wall of the spa or hot tub. The intent of this requirement is to permit ordinary appliances to be safely plugged in and used near the spa or hot tub but to avoid the need for extension cords in the vicinity of the spa or hot tub. Incorrect answer. Please choose another answer.

68.	What is the MAXIMUM length permitted of a flexible cord that may be used to cord-and-plug connect a water circulating pump motor for a swimming pool at a dwelling?
		A. 3 feet
		B. 4 feet
		C. 6 feet
		D. 10 feet
Section 680.21(A)(5) permits pool-associated motors to be cord-and-plug connected. The flexible cord shall not exceed 3 ft. in length. This wiring method is permitted due to the vibration of the motors and flexibility is required. Incorrect answer. Please choose another answer.

69.	The MAXIMUM height above the floor or working platform to the center of the operating handle of a service disconnecting switch when it is in the ON position must not exceed _____.
		A. 6 feet
		B. 6 ft. 6 in.
		C. 6 ft. 7 in.
		D. 7 feet
In general, Section 404.8(A) requires the maximum height above the floor or working platform to the center of the operating handle of a switch when it is in the ON position must not exceed 6 ft. 7 in. Incorrect answer. Please choose another answer.

70.	The upward discharging vent of an underground fuel tank of motor fuel dispensing facilities is classified as a Class I, Division 1 location WITHIN _____ of the open vent.
		A. 3 feet
		B. 5 feet
		C. 6 feet
		D. 8 feet
Due to the presence of gaseous vapors, Table 514.3(B)(1) indicates the upward discharging vent of an underground fuel tank of motor fuel dispensing facilities is a Class I, Division 1 location within 5 feet of the open end of the vent. Incorrect answer. Please choose another answer.

71.	Flexible metallic tubing (FMT) shall NOT be used in lengths exceeding ____.
		A. 5 feet
		B. 6 feet
		C. 8 feet
		D. 10 feet
Unlike flexible metal conduit (FMC) or liquidtight flexible metal conduit (LFMC), as per Section 360.12(6), flexible metallic tubing (FMT) is limited in use to 6 ft. lengths. Incorrect answer. Please choose another answer.

72.	A retail store is to have eighty (80) feet of accent track lighting installed where the track lighting will be in use continuously during business hours. For the purpose of sizing branch circuits, feeders and service entrance conductors, determine the connected load in VA.
		A. 15,000 VA
		B. 10,000 VA
		C. 12,500 VA
		D. 7,500 VA
For track lighting in non-dwelling occupancies, to comply with Section 220.43(B) a load of 150 VA is to be included for every two (2) feet of lighting track. To solve this problem , multiply 150 VA per linear foot by 80 ft. of track, by 125% (continuous load), then divide by 2. 150 VA x 80 ft. x 1.25 = 15,000 = 7,500 VA 2 2 Incorrect answer. Please choose another answer.

73.	What is the MINIMUM permitted sill height of a transformer vault doorway?
		A. 2 inches
		B. 8 inches
		C. 6 inches
		D. 4 inches
A door sill or curb of a transformer vault is to be of sufficient height to confine the oil from the largest transformer in the vault, and in no case shall be less than 4 inches in height. Reference Section 450.43(B). Incorrect answer. Please choose another answer.

74.	PVC conduit used exposed in areas of physical damage shall be _____.
		A. Type Schedule 80
		B. Type Schedule 40
		C. Type Schedule 100
		D. prohibited
The Informational Note following Section 352.10(F) states PVC conduit, Type Schedule 80 is identified for areas of physical damage. Incorrect answer. Please choose another answer.

75.	Determine the MAXIMUM setting permitted for the overload protection for a 7 hp, 3-phase, 480-volt, induction-type ac motor with a full-load current of 15 amperes, an 86% power factor, and a service factor of 1.00 indicated on the nameplate. (Assume exceptions and modifications are not to be applied.)
		A. 17.25 amperes
		B. 12.65 amperes
		C. 18.75 amperes
		D. 13.75 amperes
Where a motor has a service factor of 1.00 marked on the nameplate, for the purpose of selecting the rating or setting of the overload device, Section 430.32(A)(1) requires this device shall be selected to trip at not more than 115% of the motor nameplate full-load current rating. The power factor of the motor is not to be a consideration when sizing overload devices. Therefore, nameplate current rating of motor = 15 amperes x 1.15 = 17.25 amperes Incorrect answer. Please choose another answer.

76.	Where a portable generator is used for a portable optional standby source and is not considered a separately derived system, the equipment grounding conductor shall be bonded to _____.
		A. the generator frame and the grounded conductor
		B. the system grounding electrode
		C. a grounding conductor only
		D. the grounded conductor
Optional standby systems are intended to supply on-site generated power to selected loads either automatically or manually. Article 702 applies not only to permanently installed generators but also to portable generators. Optional standby systems are intended to supply power to buildings or structures where life safety does not depend on the performance of the system. Section 702.11(B) requires where a portable generator is used as a non-separately derived system, the equipment grounding conductor shall be bonded to the system grounding electrode. Incorrect answer. Please choose another answer.

77.	Unless special permission is granted, main feeders for supplying power to elevators shall be installed _____.
		A. inside the hoistway
		B. outside the hoistway
		C. in flexible metal conduit
		D. in rigid metal conduit
Section 620.37(A) requires only electrical equipment and wiring used directly in connection with the elevator may be installed in the hoistway and the machine room. However, unless special permission is granted, Section 620.37(C) does not permit main feeders for supplying elevators to be located in the hoistway. Incorrect answer. Please choose another answer.

78.	For electrical systems over 1000 volts, where straight pulls of conductors in junction boxes are being made, the length of the box shall NOT be less than _____ the outside diameter of the largest shielded or lead-covered conductor or cable entering the box.
		A. 8 times
		B. 12 times
		C. 32 times
		D. 48 times
Where straight pulls of conductors over 1000 volts are being made in junction boxes, the length of the box shall not be less than 48 times the outside diameter of the largest shielded or lead-covered conductor or cable entering the box. Reference Section 314.71(A). Incorrect answer. Please choose another answer.

79.	For trade size 3/4 in. Type MI cable, the radius of the inner edge of the bend shall NOT be less than _____ times the external diameter of the cable.
		A. three
		B. four
		C. five
		D. seven
In compliance with Section 332.24(1), the minimum bend radius for trade size in. Type MI cable is to be not less than five times the external diameter of the cable. The specified minimum bending radius of Type MI cable is intended to prevent mechanical damage to the conductor insulation or the sheath that could result in a short-circuit or ground-fault. Incorrect answer. Please choose another answer.

80.	Manhole covers shall be OVER _____ in weight or otherwise require the use of tools to open.
		A. 25 lbs.
		B. 50 lbs.
		C. 75 lbs.
		D. 100 lbs.
The intent of Section 110.75(D), requiring manhole covers to be over 100 lbs. or requiring the use of tools to open, is to prevent unqualified personnel from entering the manhole and being exposed to an electrical hazard. Incorrect answer. Please choose another answer.

81.	Size 4/0 AWG, 75C aluminum secondary conductors of a 3-phase, delta-wye transformer, shall be protected at NOT more than _____ .
		A. 175 amperes
		B. 200 amperes
		C. the calculated load connected to the transformer
		D. none of these, because secondary protection is not required for multiphase, delta-wye transformer secondary conductors
Section 240.4(F) requires secondary overcurrent protection on delta-wye connected transformers. In regard to this transformer, Table 310.15(B)(16) indicates size 4/0 AWG, 75C aluminum conductors to have an allowable ampacity of 180 amperes. Since the ampacity of the conductors does not correspond to a standard overcurrent protective device ampere rating, as permitted by Section 240.4(B)(3), you may go up to the next standard ampere rating which is 200 amperes. Incorrect answer. Please choose another answer.

82.	For the purpose of determining conductor fill in conduit, a multiconductor flexible cord or cable of four (4) conductors shall be treated as _____ conductor(s).
		A. one
		B. two
		C. three
		D. four
For the purpose of determining conductor fill in conduit, Note 9 to the tables located in Chapter 9, requires multiconductor cable or cords of two or more conductors shall be treated as a single conductor. Incorrect answer. Please choose another answer.

83.	Ceiling suspended (paddle) fans weighing more than _____ shall be supported independently of the outlet box.
		A. 30 lb.
		B. 25 lb.
		C. 50 lb.
		D. 70 lb.
Section 314.27(C) addresses requirements for supporting ceiling-suspended (paddle) fans. Outlet boxes specifically listed to adequately support ceiling-mounted paddle fans are readily available. However, the boxes are not listed for use to support fans that weigh more than 70 lb. Incorrect answer. Please choose another answer.

84.	What is the MAXIMUM size overcurrent protection device required to protect size 14 AWG copper conductors used for a pump motor control-circuit that is protected by the motor branch circuit protection device and extends beyond the enclosure?
		A. 15 amperes
		B. 20 amperes
		C. 45 amperes
		D. 100 amperes
Where a motor control circuit conductor is tapped from the load side of the motor overcurrent protective device, the size of the tapped conductor and the rating of the overcurrent device are based on whether the conductor stays within the motor control enclosure or leaves it. Due to the initial high inrush of current when the motor starts, the overcurrent protection is similar to the overcurrent protection provided for a motor and is allowed to be greater than the ampacity of the conductor. Section 430.72(B)(2) permits where the conductors extend beyond the motor control equipment enclosure, the rating of the protective device shall not exceed the value specified in Column C of Table 430.72(B). Incorrect answer. Please choose another answer.

85.	In general, multiconductor flat cable of size 4 AWG or larger conductors shall be permitted to employ an external _____ on the grounded (neutral) conductor.
		A. color coding
		B. marking
		C. green color
		D. ridge
The intent of Section 200.6(E) is to provide a means of identifying the grounded (neutral) conductor of multiconductor flat cable of 4 AWG or larger. The cable shall be permitted to employ an external ridge on the grounded conductor. Incorrect answer. Please choose another answer.

86.	A 120/240-volt, single-phase feeder of a retail shopping mall is to supply a noncontinuous load of 20,000 VA and a continuous load 16,000 VA. Consider the overcurrent device protecting the feeder conductors is not listed for operation at 100 percent of its rating and determine the MINIMUM size 75C copper conductors required for this installation.
		A. 1/0 AWG
		B. 2/0 AWG
		C. 3/0 AWG
		D. 1 AWG
As per Section 215.2(A)(1)(a), feeder conductors are required to have an ampacity to carry 100% of the noncontinuous load, plus 125% of the continuous load: 20,000 VA x 100% = 20,000 VA 16,000 VA x 125% = 20,000 VA Total = 40,000 VA Apply the single-phase current formula to find the load: I = power I = 40,000 VA = 166.6 amperes volts 240 volts In accordance with Table 310.15(B)(16), size 2/0 AWG 75 rated copper conductors with an allowable ampacity of 175 amperes should be selected. Incorrect answer. Please choose another answer.

87.	Apply the general method of calculations for dwelling units and determine the demand load, in kW, on the ungrounded (line) service-entrance conductors for the electric ranges, where a 12 unit multifamily dwelling has an 8 kW range in each apartment.
		A. 39.36 kW
		B. 32.00 kW
		C. 27.00 kW
		D. 30.72 kW
Column B of Table 220.55 shows the demand factor is 32% for 12 household electric ranges having a rating of 8 kW each: 12 (ranges) x 8 kW x .32 = 30.72 kW demand Incorrect answer. Please choose another answer.

88.	General-use receptacle outlets in a dwelling located in a living room or a bedroom, shall be installed such that no point measured horizontally in any wall space is more than _____ from a receptacle outlet.
		A. 12 feet
		B. 6 feet
		C. 10 feet
		D. 8 feet
According to Section 210.52(A)(1), general-use receptacles located in a living room or bedroom of a dwelling are to be spaced so that no point along the wall is more than 6 ft. from a receptacle. In other words, the receptacles are to be spaced not further than 12 ft. apart. The intent of this rule is receptacle outlets are to be located so that an appliance or lamp with a flexible cord attached may be placed anywhere in the room near a wall and be within 6 ft. of a receptacle, minimizing the use of extension cords. Incorrect answer. Please choose another answer.

89.	Interior metal water lines located NOT more than _____ from the point of entrance to the building shall be permitted to be used as a conductor to interconnect electrodes that are part of the grounding electrode system.
		A. 10 feet
		B. 8 feet
		C. 5 feet
		D. 20 feet
The requirement in Section 250.68(C)(1) limits grounding and bonding connections to occur only within the first 5 ft. of where the piping enters a building or structure, because of concerns that the use of PVC piping or fittings could interrupt the electrical continuity of the metal water piping. The piping at this point is not considered a grounding electrode, [only the underground portion is an electrode per Section 250.52(A)(1)]. Incorrect answer. Please choose another answer.

90.	The independent support wires used to support electrical metallic tubing (EMT) and flexible metal conduit (FMT) above a non-fire-rated ceiling shall be shall be distinguishable from the ceiling support wires by means of _____. I. color II. tagging
		A. I only
		B. II only
		C. either I or II
		D. neither I nor II
Unless the ceiling support system is installed in accordance with the ceiling system manufacturer's instructions, an independent means of secure support wires used to support any type of wiring shall be provided and are permitted to be attached to the ceiling assembly. The independent support wires shall be distinguishable from the ceiling support wires by color, tagging, or other effective means. Reference Section 300.11(A)(2). Incorrect answer. Please choose another answer.

91.	A single-phase, 230-volt branch circuit is to supply a 10 kW load having a full-load current rating of 50 amperes. Determine the power factor.
		A. 87%
		B. 69%
		C. 78%
		D. 83%
To determine the power factor apply the single-phase power factor formula: Power factor = watts Power factor = 10 kW x 1000 = 10,000 = .869 = 87% va 230 x 50 11,500 Incorrect answer. Please choose another answer.

92.	Power distribution blocks shall be permitted to be placed in pull and junction boxes having a volume over at LEAST ____ for connections of conductors installed in boxes where the power distribution blocks do not have uninsulated live parts exposed within the box, whether or not the box cover is installed.
		A. 30 cubic inches
		B. 60 cubic inches
		C. 75 cubic inches
		D. 100 cubic inches
Section 314.28(E) provides requirements for the installation of power distribution blocks as a termination or connection means for conductors contained within pull or junction boxes. The use of power distribution blocks in junction boxes or pull boxes is limited to enclosures over 100 cu. in Incorrect answer. Please choose another answer.

93.	The circuit disconnecting means for non-power-limited fire alarm (NPLFA) circuits shall have _____ colored identification, shall be accessible only to qualified persons and shall be identified as "FIRE ALARM CIRCUIT."
		A. red
		B. orange
		C. yellow
		D. blue
As mandated by Section 760.41(B), the circuit disconnecting means for NPLFA circuits shall have red identification and shall be accessible only to qualified persons. Incorrect answer. Please choose another answer.

94.	A flexible metal conduit (FMC) having a length of 4 ft. is to supply a panelboard from a transformer. The FMC will contain three (3) size 400 kcmil THWN copper conductors and one (1) size 350 kcmil THWN copper conductor. In compliance with the NEC, what is the MINIMUM trade size FMC required?
		A. 2 in.
		B. 3 in.
		C. 3 in.
		D. 4 in.
When given a conduit fill question like this where only one (1) conductor is smaller than the remaining conductors of all the same size, in order to save time when taking the test, refer to the conduit fill tables in Informative Annex C. Table C.3 of Annex C indicates a trade size 3 in. flexible metal conduit may contain five (5) size 400 kcmil THWN conductors. Incorrect answer. Please choose another answer.

95.	An outside overhead span of 3-phase, 4 wire, 480Y/277-volt conductors are to be installed between two buildings of a college campus. The area the conductors cross will not be subject to truck traffic. The conductors must have a MINIMUM clearance of _____ from final grade.
		A. 10 feet
		B. 12 feet
		C. 15 feet
		D. 18 feet
As per Section 225.18(2), overhead spans of open conductors over commercial areas not subject to truck traffic are required to have a clearance of at least 12 ft. from final grade, where the voltage to ground does not exceed 300-volts. The voltage to ground on a 480Y/277-volt system is 277-volts, therefore the 12 ft. clearance from final grade is permitted. Incorrect answer. Please choose another answer.

96.	Cables operating at over 600 volts and those operating at 600 volts or less, are permitted to be installed in a common cable tray without a fixed barrier, where the cables operating at over 600 volts are _____.
		A. Type MI
		B. Type NM
		C. Type CT
		D. Type MC
As allowed by the rules in Section 392.20(B)(1), Type MC cables operating at over 600 volts and those operating at 600-volts or less are permitted to be installed in a common cable tray without a fixed barrier provided. Incorrect answer. Please choose another answer.

97.	When calculating the total load for a mobile home park, before demand factors are taken into consideration, each individual mobile home lot shall be calculated at a MINIMUM value of _____ .
		A. 15,000 VA
		B. 16,000 VA
		C. 20,000 VA
		D. 24,000 VA
Mobile home park electrical systems must be calculated on the basis of the larger of (1) not less than 16,000 volt-amperes (at 120/240-volts, single-phase) for each mobile home lot or (2) the calculated load of the largest typical mobile home the lot will accommodate. Reference Section 550.31(1). However, the ampacity of the feeder-circuit conductors to each mobile home lot may not be less than 100 amperes as per Section 550.33(B). Incorrect answer. Please choose another answer.

98.	Where a restaurant located in a retail shopping mall has a main circuit breaker rated for 400 amperes, the required bonding jumper to the metal water piping system is to be at LEAST _____ copper.
		A. 6 AWG
		B. 2 AWG
		C. 3 AWG
		D. 4 AWG
Section 250.104(A)(2) recognizes that the increased use of nonmetallic water piping mains can result in the interior metal piping system of a multi-occupancy building to be isolated from ground and from other occupancies. Therefore, the water pipe is to be bonded to the panelboard or switchboard that serves only that particular occupancy. The bonding jumper, in this case, is permitted to be sized according to Table 250.122, based on the size of the overcurrent device supplying the occupancy. Since the main circuit breaker is rated 400 amperes, a size 3 AWG copper bonding jumper should be selected from Table 250.122. Incorrect answer. Please choose another answer.

99.	For either overhead or underground primary distribution systems that exceed 1000 volts on private property, the service disconnecting means shall be _____.
		A. installed in a location that is readily accessible
		B. installed at a height not exceeding 6 ft., 7 in.
		C. readily accessible to qualified persons only
		D. permitted to be located in a location that is not readily accessible
For primary distribution systems exceeding 1000 volts on private property, the service disconnecting is permitted to be located in a location that is not readily accessible. Reference Section 230.205(A). The purpose of this rule is to prevent ready access to unauthorized personnel. Incorrect answer. Please choose another answer.

100.	In general, all panelboards are required to have overcurrent protection, an exception to this rule is _____.
		A. panelboards that supply a second bus structure within the same panelboard assembly
		B. for existing panelboards used as service equipment in a one-family dwelling
		C. panelboards containing less than 42 overcurrent devices
		D. panelboards containing only single-pole overcurrent devices
In general, in compliance with Section 408.36, all panelboards are to be protected by an overcurrent protective device. However, Exception No. 3 to this rule states, for existing panelboards, individual protection shall not be required for a panelboard used as service equipment for an individual residential occupancy. Incorrect answer. Please choose another answer.