2024 Edition

Master Electrician - Test 3 - 2014 NEC

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1.	Given: After all demand factors have been taken into consideration for a commercial building, the balanced demand load is determined to be 75 kVA; the building has a 208Y/120-volt, 3-phase electrical system. What MINIMUM size copper conductors with THWN insulation are required for the ungrounded (phase) service-entrance conductors?
		A. 2/0 AWG
		B. 3/0 AWG
		C. 4/0 AWG
		D. 250 kcmil
First, apply the 3-phase current formula to find the load in amperes: I = kVA x 1000 I = 75 kVA x 1000 = 75,000 = 208.1 amperes E x 1.732 208 x 1.732 360.25 Size 4/0 AWG THWN copper conductors with an ampacity of 230 amperes should be selected as shown in Table 310.15(B)(16). Incorrect answer. Please choose another answer.

2.	The NEC requires a MINIMUM of _____ receptacles to be provided in each operating room of a hospital.
		A. 36
		B. 24
		C. 12
		D. 8
Section 517.19(C) indicates the minimum number of receptacles to be provided for an operating room of a health care facility is 36. At least 12 of the 36 receptacles are required to be connected to either the normal system branch or the critical branch circuit supplied by a different transfer switch than the other receptacles at the same location. Incorrect answer. Please choose another answer.

3.	In general, round access openings in a manhole shall NOT be less than _____ in diameter.
		A. 18 inches
		B. 24 inches
		C. 26 inches
		D. 30 inches
Manhole openings for personnel are to be of an adequate size to provide ready access and egress. Therefore, Section 110.75(A) requires round access openings for a manhole to be not less than 26 inches in diameter. Incorrect answer. Please choose another answer.

4.	For other than dwelling units, all 125-volt, single-phase, 15- and 20-ampere receptacles located _____ shall be provided with GFCI protection for personnel.
		A. in kitchens
		B. in bathrooms
		C. on rooftops
		D. in all these locations
You should have selected, in all these locations, because Sections 210.8(B)(1),(2)&(3) requires all 15- and 20-ampere, 125-volt receptacles located in nondwelling-type kitchens, bathrooms, and on rooftops to be GFCI protected. This rule is in place to protect persons from accidental shock hazards and possible electrocution when using cord-and-plug connected appliances and equipment. Incorrect answer. Please choose another answer.

5.	In regard to a 7 hp, 480-volt, 3-phase ac motor with an 80 percent power factor and a full-load ampere rating of 19 amperes indicated on the nameplate, and a service factor of 1.15; when the initial setting of the overload device you have selected is not sufficient to carry the load, what is the MAXIMUM setting permitted for the overload protection?
		A. 21.85 amperes
		B. 23.75 amperes
		C. 24.70 amperes
		D. 26.60 amperes
In compliance with Section 430.6(A)(2), the ampere rating provided on the motor nameplate is used to size the overload protective devices intended to protect the motor. The basic premise of overload protection 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 system components from damaging overload currents. Overload protection shall be selected to trip or shall be rated at no more than the percentage values of the motor nameplate full-load current rating given in Section 430.32(A)(1). However, modification of this value shall be permitted as provided in 430.32(C). Since the motor in the question has a service factor of 1.15, multiply the nameplate current rating of 19 amperes times 140% to determine the maximum setting or rating of the overload protection device. 19 amperes x 140% = 26.60 amperes Incorrect answer. Please choose another answer.

6.	Health care facilities require ground fault protection:
		A. on all 208Y/120-volt, 3-phase, 4-wire systems.
		B. on the next level of feeders after the service disconnect.
		C. to be omitted from all life-safety branch-circuits.
		D. on all essential electrical systems feeders.
Whenever ground-fault protection of service equipment is provided for a health care facility, whether by design or in compliance with the requirements in Section 215.10 or 230.95, an additional step of ground-fault protection shall be provided in all next level feeder disconnecting means downstream toward the load. As per the provisions of Section 517.17(B), ground-fault protection must be applied to every feeder. The additional levels of ground-fault protection shall not be installed on the load side of an essential electrical system transfer switch. Incorrect answer. Please choose another answer.

7.	What MINIMUM voltage is required after 1 hours to serve emergency lighting from a storage battery, when the normal source voltage of 120 volts is interrupted?
		A. 60 volts
		B. 90 volts
		C. 105 volts
		D. 120 volts
If the alternate source of supply for emergency lighting systems is a storage battery, the battery source operates only if the normal source fails. A transfer means (throw over switch) is to be provided to energize the emergency equipment from the alternate supply when the normal source of supply is interrupted. As per Section 700.12(A) the storage batteries are to be of a suitable rating and capacity to supply and maintain the total load for a minimum period of 1 hours, without the voltage applied to the load falling below 87 percent of normal. Therefore, if the normal source of supply is 120 volts, then the storage batteries are to maintain a voltage of not less than 105 volts for a period of not less than 1 hours. 120 volts x 87.5% = 105 volts Incorrect answer. Please choose another answer.

8.	Where the heating, air-conditioning or refrigeration equipment is installed on the roof of an apartment building, a 15- or 20-ampere, 125-volt receptacle _____.
		A. is not required for dwelling units
		B. may be connected to the line side of the equipment disconnecting means, provided the receptacle is of the GFCI type
		C. shall be located on the same level and within 25 ft. of the equipment
		D. may be located anywhere on the roof where the equipment is located, provided the receptacle is GFCI protected and within at least 75 ft. of the equipment
By requiring a permanently installed receptacle within 25 ft. of the HACR equipment, Section 210.63 improves worker safety by eliminating the need to use makeshift methods of obtaining 120 volt power for cord-and-plug connected equipment when servicing and/or troubleshooting the HACR equipment. Incorrect answer. Please choose another answer.

9.	Atmospheres containing combustible metal dusts such as aluminum or magnesium are considered to be material _____ classifications.
		A. Group E
		B. Group D
		C. Group C
		D. Group F
Section 500.6(B) separates combustible dusts into three Class II groups - E, F and G depending on their properties. When installed in Class II locations, equipment must be approved not only for the class but also for the specific group and installation standards. As indicated by Section 500.6(B)(1), atmospheres containing combustible metal dusts such as aluminum or magnesium are considered to be material Group E classifications. Incorrect answer. Please choose another answer.

10.	Aluminum or steel cable trays shall be permitted to be used as equipment grounding conductors, provided _____ . I. the cable tray sections and fittings are identified as an equipment grounding conductor II. the cable tray sections and fittings are durably marked to show the cross-sectional area of the metal
		A. I only
		B. II only
		C. Neither I nor II
		D. Both I and II
Section 392.60(A) permits the use of cable tray as the equipment grounding conductor in certain installations. The cable tray is to be electrically continuous and effectively bonded and grounded. As per Sections 392.60(B)(1)&(3), aluminum or steel cable trays are permitted to be used as equipment grounding conductors, provided the cable tray sections and fittings are identified as an equipment grounding conductor and the cable tray sections and fittings are durably marked to show the cross-sectional area of the metal. Incorrect answer. Please choose another answer.

11.	What is the MINIMUM number of 120-volt, 15-ampere, general lighting branch circuits required for a dwelling unit having a calculated general lighting load of 9,600 VA?
		A. six
		B. five
		C. four
		D. three
First find the VA of one circuit: 120 volts x 15 amperes = 1,800 VA Next, divide the load of 9,600 VA by 1,800 VA (one circuit): 9,600 VA (load) = 5.3 = 6 circuits 1,800 VA (1 circuit) Incorrect answer. Please choose another answer.

12.	In regard to emergency systems, where internal combustion engines are used as the prime movers, they shall NOT be solely dependent on a public utility gas system for their fuel supply, unless _____ .
		A. it is acceptable to the authority having jurisdiction
		B. the gas system is listed and approved
		C. the gas system and electrical utility are jointly owned and maintained
		D. none of these apply
The exception to Section 700.12(B)(3) permits where acceptable to the authority having jurisdiction, where internal combustion engines are used as the prime movers for emergency systems, they are permitted to be solely dependent on a public utility gas system for their supply. Incorrect answer. Please choose another answer.

13.	Wall-mounted 15- and 20-ampere, 125-volt receptacle outlets installed in dwelling units shall not be counted as part of the required number of receptacle outlets where they are located MORE than _____ above the floor.
		A. 18 inches
		B. 5 feet
		C. 24 inches
		D. 4 feet
The requirements addressed in Section 210.52 apply to 125-volt, 15- or 20-ampere receptacles located in dwelling units that are not part of a luminaire or appliance. These receptacles are normally used to supply lighting and general-use cord-and- plug connected appliances and electrical equipment. They are in addition to the ones that are more than 5 ft. above the floor or within cabinets or cupboards. Incorrect answer. Please choose another answer.

14.	Where ambient temperature and the number of current-carrying conductors in the raceway are not a factor, what MINIMUM size 75C copper ungrounded (phase) feeder conductors are required to supply 200 ampere rated continuous load?
		A. 2/0 AWG
		B. 3/0 AWG
		C. 4/0 AWG
		D. 250 kcmil
Section 215.2(A)(1)(a) states feeder conductors are to have an ampacity of not less than 125% of the continuous load, plus 100% of the noncontinuous load. 200 amperes x 125% = 250 amperes Therefore, size 250 kcmil 75C copper conductors with an allowable ampacity of 255 amperes should be selected from Table 310.15(B)(16). Incorrect answer. Please choose another answer.

15.	Apply the general method of calculation and determine the demand load, in kW, on the ungrounded service-entrance conductors for one (1) household electric range rated 20,800 watts.
		A. 20.8 kW
		B. 12.5 kW
		C. 11.6 kW
		D. 8.0 kW
When applying demand factors for household electric ranges all of the same rating over 12 kW through 27 kW, apply Note 1 and Column C of Table 220.55, which states to increase the Column C demand value by 5% for each kW that exceeds 12 kW. First find the portion that exceeds 12 kW: 21 kW - 12 KW = 9 kW Next multiply 9 kW by 5%: 9 kW x 5% = 45% increase in Column C 8 kW (1 range - Column C demand value) x 45% = 3.6 kW increase 8 kW (Column C demand value) + 3.6 kW (increase) = 11.6 kW demand Incorrect answer. Please choose another answer.

16.	Given: A busway has an ampere rating of 1,100 amperes. What is the MAXIMUM standard size overcurrent protection devices that may be used to protect the busway?
		A. 900 amperes
		B. 1,000 amperes
		C. 1,100 amperes
		D. 1,200 amperes
In compliance with Section 240.4(C), the ampacity of the conductors shall be equal to or greater than the overcurrent device, when over 800 amperes. Therefore, the maximum standard size overcurrent devices that may be used to protect a busway with an ampere rating of 1,100 amperes is 1,000 ampere rated overcurrent protective devices. The standard ratings of overcurrent protective devices are listed in Section 240.6(A). Incorrect answer. Please choose another answer.

17.	When sizing overcurrent protection for fire pump motors, the device(s) shall be selected or set to carry indefinitely the ____ of the motor.
		A. starting current
		B. full-load running current
		C. locked-rotor current
		D. full-load amperage as indicated on the nameplate
Sections 695.4(B)(2)(a)(1), 695.5(B) and 695.5(C)(2) address the provisions required for overcurrent protection for fire pumps. The requirement for sizing the overcurrent protection so it is able to carry the locked-rotor current indefinitely is a key factor to keeping the fire pump on line in the event of a fire. Due to the critical life safety and property protection function of a fire pump, when a fire occurs it is essential to keep the fire pump motors running as long as possible to help put out the fire. If the locked-rotor amperes is not indicated on the motor nameplate, the locked rotor currents found in Table 430.251(B) must be used to size the overcurrent protection. Incorrect answer. Please choose another answer.

18.	Ceiling-suspended luminaires (lighting fixtures) or paddle fans located _____ or more above the maximum water level of an indoor installed spa or hot tub shall NOT require GFCI protection.
		A. 7 feet
		B. 8 feet
		C. 10 feet
		D. 12 feet
The intent of Section 680.43(B)(1)(a) is to prevent persons from coming into inadvertent contact with luminaires or ceiling-suspended (paddle) fans located over a spa or hot tub. When GFCI protection is not provided, the luminaires and/or fans are to be installed at a height of not less than 12 ft. above the spa or hot tub. Incorrect answer. Please choose another answer.

19.	In general, all mechanical elements used to terminate a grounding electrode conductor or bonding jumper to a grounding electrode shall be accessible. Which of the following, if any, is/are an exception(s) to this rule? I. A connection to a concrete encased electrode. II. A compression connection to fire-proofed structural metal.
		A. I only
		B. II only
		C. neither I nor II
		D. both I and II
Exception No. 1 to Section 250.68(A) does not require the terminations to be accessible. Ground clamps and other connectors suitable for use where buried or embedded in concrete must be listed for such use as per 250.70. Exception No. 2 permits connections, including the attachment of a compression lug to structural steel, to be encapsulated by fireproofing material. This exception recognizes the importance of maintaining the integrity of the structural fireproofing. Incorrect answer. Please choose another answer.

20.	Where given the following conditions, determine the MINIMUM size copper branch-circuit conductors with Type XHHW-2 insulation required to supply a roof-top mounted air-conditioning unit with a full-load ampere rating of 45 amperes. 1) The conductors are to be installed in an EMT, exposed to sunlight 3 in. above the roof-top. 2) The ambient temperature on the rooftop is 115F. 3) The A/C unit is operating at a 3-phase voltage of 208; 3 conductors are considered current-carrying. 4) The terminations of the A/C unit are rated for 75C.
		A. 8 AWG
		B. 6 AWG
		C. 4 AWG
		D. 2 AWG
To solve this problem we need to take the following factors into consideration: 1) Branch-circuit conductors supplying a single A/C unit are to have a current-carrying capacity of at least 125% of the FLC rating of the unit. [440.32] 45 amperes x 125% = 56.25 amperes 2) The exception to 310.15(B)(3) permits conductors with Type XHHW-2 insulation to NOT be subject to the ambient temperature adjustments shown in Table 310.15(B)(3)(c), Ambient Temperature Adjustment for Raceways or Cables Exposed to sunlight on or Above Rooftops. 3) Because of the elevated ambient temperature, apply the ambient temperature correction factors shown in Table 310.15(B)(2)(a). 56.25 amperes .82 = 68.59 amperes 4) As mandated by Section 110.14(C), the temperature rating associated with the ampacity of a conductor shall be selected so as not to exceed the lowest temperature rating of any connected termination. Therefore, you should select size 4 AWG conductors with an ampacity of 85 amperes from the 75C column of Table 310.15(B)(16). Incorrect answer. Please choose another answer.

21.	Fuses shall NOT be permitted to be connected in parallel where _____. I. they are factory assembled and listed as a unit II. they are installed by a technician on the jobsite
		A. I only
		B. II only
		C. neither I nor II
		D. both I and II
Section 240.8 prohibits the use of fuses or circuit breakers connected in parallel unless they are factory assembled in parallel and listed as a unit. Incorrect answer. Please choose another answer.

22.	Each multiwire branch circuit shall be provided with a means that will simultaneously disconnect _____ at the point where the branch circuit originates.
		A. all ungrounded conductors
		B. not more than two ungrounded conductors
		C. all grounded and ungrounded conductors
		D. all grounded, ungrounded and grounding conductors
As addressed in Section 210.4(B), all ungrounded conductors of a multiwire branch circuit are required to be simultaneously disconnected to reduce the risk of shock to installers and personnel working on equipment supplied by a multiwire branch circuit. Incorrect answer. Please choose another answer.

23.	Determine the Maximum ampere setting permitted for an overload protective device responsive to motor current, where used to protect a 20 hp, 240-volt, 3-phase, induction type ac motor with a temperature rise of 48C and a full-load ampere rating of 54 amperes indicated on the nameplate. Assume the initial setting of the overload protective device selected is not sufficient to start the motor, therefore modification of this value is necessary.
		A. 54.0 amperes
		B. 70.2 amperes
		C. 62.1 amperes
		D. 75.6 amperes
As required by Section 430.32(A)(1) the overload device shall be rated based on the motor nameplate full-load current rating and modification of the values given on 430.32(A)(1) are permitted, therefore the values shown in Section 430.32(C) are allowed to be used. Due to the high temperature rise of the motor multiply the nameplate FLC of the motor, 54 amperes, times 130%. 54 amperes (nameplate current rating) x 130% = 70.2 amperes Incorrect answer. Please choose another answer.

24.	A single electrode consisting of a ground rod, pipe, or plate that does not have a resistance to ground of 25 ohms or less, shall be supplemented by one (1) additional electrode. Which of the following listed is/are approved for this purpose?
		A. a concrete-encased electrode
		B. a ground ring
		C. the metal frame of the building
		D. all of these
Where a supplemental grounding electrode is required, Section 250.53(A)(2) states the additional electrode(s) may be of a type specified in 250.52(A)(2) through (A)(8). Supplemental grounding electrodes may be a concrete-encased electrode, a ground ring, the metal frame of a building, a ground ring, rod and pipe electrodes plus plate electrodes. Incorrect answer. Please choose another answer.

25.	What classified (hazardous) location(s), if any, does the NEC' permit flexible metal conduit (FMC) for connections to motors? I. Class I, Division 2 II. Class II, Division 1
		A. I only
		B. II only
		C. both I and II
		D. neither I nor II
As permitted by Section 501.10(B)(2)(2), flexible metal conduit (FMC) may be used for connection to motors in Class I, Division 2 locations. Section 502.10(A)(2) does not recognize FMC for such use in Class II, Division 1 locations. Incorrect answer. Please choose another answer.

26.	At carnivals and fairs, service equipment shall not be installed in a location that is accessible to unqualified persons, unless the equipment _____.
		A. is lockable
		B. is provided with GFCI protection
		C. is installed at a height of 6 feet or greater
		D. has a voltage to ground of not more than 125 volts
The intent of the rule addressed in Section 525.10(A) is to prevent unauthorized personnel access to energized electrical equipment where they may encounter a shock hazard or electrocution. Incorrect answer. Please choose another answer.

27.	Nonmetallic surface extensions shall be permitted to be run in any direction from an existing outlet, but NOT within _____ of the floor level.
		A. 1 foot
		B. 1 feet
		C. 2 feet
		D. 2 inches
The reason Section 382.15(A) does not allow exposed nonmetallic extensions to be on the floor or within 2 inches of the floor is because the raceway may be subject to water and physical damage during housekeeping. Incorrect answer. Please choose another answer.

28.	The NEC permits a building to have more than one service when: I. the load requirements of the building are at least in excess of 800 amperes. II. the building is separated by firewalls with a four-hour rating.
		A. I only
		B. II only
		C. either I or II
		D. neither I nor II
Under special conditions, special occupancies and capacity requirements, a building is permitted to have more than one service, but Sections 230.2(A),(B),&(C) does not recognize the conditions given in this question to merit an additional service. Incorrect answer. Please choose another answer.

29.	In the garage of a dwelling unit, a 125-volt, single-phase, 15-ampere, receptacle installed in the ceiling provided for the garage door opener must be _____ . I. a single receptacle II. FCI protected for personnel
		A. I only
		B. II only
		C. either I or II
		D. neither I nor II
There are no exceptions to the GFCI requirements for 125-volt, single-phase, receptacles located in a residential garage. This requirement ensures that all 15- and 20-ampere, 125-volt receptacles installed in garages provide GFCI protection for the user of cord-and-plug connected appliances or other equipment regardless of where the equipment is located in the garage. Refer to Section 210.8(A)(2). Incorrect answer. Please choose another answer.

30.	Cartridge fuses in circuits over _____ to ground shall be provided with a disconnecting means on their supply side.
		A. 120 volts
		B. 150 volts
		C. 277 volts
		D. 300 volts
As per Section 240.40, all fuses in circuits over 150 volts to ground, shall be provided with a disconnecting means on their supply side. Incorrect answer. Please choose another answer.

31.	Outlets supplying permanently installed swimming pool pump motors from single-phase, 15- or 20-ampere, 120- or 240-volt branch circuits, shall be provided with GFCI protection _____ .
		A. where installed outdoors
		B. when cord-and-plug connected
		C. when direct (hard-wired) connected
		D. where any of the above conditions exist
Section 680.21(C) requires all single-phase 120-volt and 240-volt, 15- or 20- ampere rated branch-circuits supplying permanently installed pool pump motors to have GFCI protection regardless of the type of wiring method used. Incorrect answer. Please choose another answer.

32.	The branch circuit conductors supplying a 240-volt, single-phase, 15 kW rated fixed electric space heater provided with a 10 ampere blower motor are required to have an ampacity of at LEAST _____ .
		A. 63 amperes
		B. 78 amperes
		C. 91 amperes
		D. 109 amperes
Section 424.3(B) mandates that the branch circuits sized to supply fixed electric space heating equipment are to be considered carrying a continuous load. Section 210.19(A)(1)(a) requires branch-circuit conductors are to have an ampacity of 125% of the continuous load(s) supplied. To solve this problem, first apply the single-phase current formula to find the FLC of the heater: I = kW x 1,000 I = 15 x 1,000 = 15,000 = 62.5 amperes (heater) volts 240 240 Next add the FLC of the heater and the blower together and apply the continuous load factor: 62.5 amperes (heater) +10.0 amperes (blower) 72.5 amperes x 125% = 91 amperes Incorrect answer. Please choose another answer.

33.	A commercial kitchen is to contain the following listed cooking related equipment: * one - 19 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 What is the demand load, in kW, on the ungrounded (phase) service-entrance conductors after applying the demand factors for the kitchen equipment?
		A. 24.00 kW
		B. 26.25 kW
		C. 18.38 kW
		D. 20.31 kW
For kitchen equipment in other than dwelling units, Section 220.56 permits the use of the values given in Table 220.56 to be used for calculating the demand load: 19.00 kW - range 5.00 kW - water heater 0.75 kW - mixer 2.50 kW - dishwasher 2.00 kW - booster heater 2.00 kW - broiler 31.25 kW - total connected load x 65% = 20.31 kW *NOTE: However the NEC states the demand shall not be less than the two largest pieces of equipment. 19.00 kW + 5.00 kW = 24 kW demand Incorrect answer. Please choose another answer.

34.	A metal underground water pipe is permitted for use as a grounding electrode where the water pipe is in direct contact with the earth for at LEAST _____ or more.
		A. 3 feet
		B. 5 feet
		C. 8 feet
		D. 10 feet
The effectiveness of underground metal water piping as a grounding electrode for electrical systems has long been recognized. As mandated by Section 250.52(A)(1), a metal underground water pipe must be in contact with the earth for at least 10 feet in order to qualify as an effective grounding electrode. Incorrect answer. Please choose another answer.

35.	A kitchen with a total demand load of 54,000 VA is to be added to an existing church. The electrical system is 208Y/120-volts, 3-phase. What MINIMUM size THWN copper feeder conductors are required for the kitchen addition?
		A. 1 AWG
		B. 1/0 AWG
		C. 2/0 AWG
		D. 3/0 AWG
First, determine the load, in amperes, of the kitchen addition by using the 3-phase current formula: I = 54,000 VA = 54,000 = 149.89 amperes 208 x 1.732 360.25 Then, select the conductor size from Table 310.15(B)(16). Size 1/0 AWG THWN conductors with an ampacity of 150 amperes should be selected. Incorrect answer. Please choose another answer.

36.	A feeder at a school welding shop is to supply the following listed 240-volt, single-phase transformer arc welders all with a 50 percent duty cycle. * two (2) with 60 amperes rated primary current * two (2) with 50 amperes rated primary current * two (2) with 40 amperes rated primary current The feeder is required to have an ampacity of at LEAST _____.
		A. 213 amperes
		B. 196 amperes
		C. 182 amperes
		D. 176 amperes
Even under high-production conditions, the loads on transformer arc welders are considered intermittent. Select the appropriate factor from Table 630.11(A) based on the type of welder and the duty cycle of the welder to size the supply conductors. When a feeder supplies more than one arc welder, the conductor ampacity rating is based on the sum of the current ratings of the individual arc welders determined by applying the values shown in Table 630.11(A) and as per Section 630.11(B), multiplying by 100% of the two largest welders, plus 85% of the third largest welder, plus 70% of other fourth largest welder, plus 60 percent of all remaining welders in the group. 60 amperes x .71 = 43 amperes x 100% = 43 amperes 60 amperes x .71 = 43 amperes x 100% = 43 amperes 50 amperes x .71 = 36 amperes x 85% = 31 amperes 50 amperes x .71 = 36 amperes x 70% = 25 amperes 40 amperes x .71 = 28 amperes x 60% = 17 amperes 40 amperes x .71 = 28 amperes x 60% = 17 amperes TOTAL = 176 amperes Incorrect answer. Please choose another answer.

37.	Rigid polyvinyl chloride conduit (PVC) LARGER than trade size _____ shall not be used.
		A. 4 in.
		B. 5 in.
		C. 6 in.
		D. 3 in.
Section 352.20(B) states PVC conduit larger than trade size 6 in. shall not be used. Incorrect answer. Please choose another answer.

38.	What is the MAXIMUM balanced demand load, in VA, permitted to be connected to a new service of a commercial building where given the following conditions? I. The service is 208Y/120-volts, 3-phase, with a 600 ampere rated main circuit breaker. II. The maximum load must not exceed 80 percent of the ampere rating of the main circuit breaker.
		A. 57,600 VA
		B. 99,840 VA
		C. 172,923 VA
		D. 178,692 VA
To solve this problem, apply the 3-phase power formula: P = I x E x 1.732, and multiply by 80%: P = 600 amperes x 208 volts x 1.732 x 80% = 172,923 VA Incorrect answer. Please choose another answer.

39.	Splices and taps in surface nonmetallic raceways without covers capable of being opened in place shall be _____.
		A. permitted anywhere within the raceway
		B. made only in boxes
		C. made only in raceway lengths exceeding 12 inches
		D. made only with conductors having a temperature rating of not less than 90 C
As per Section 388.56, where surface nonmetallic raceways have covers not capable of being opened in place, splices and taps of conductors shall be made only in boxes. Incorrect answer. Please choose another answer.

40.	Openings around electrical penetrations of a wall of a designated information technology room are required to be _____ .
		A. insulated
		B. airtight
		C. firestopped
		D. sound proof
Section 645.3(A), states the rules in Section 300.21 shall apply to penetrations of the fire-resistant room boundary. Section 300.21 requires openings around electrical penetrations through fire-resistant-rated walls, shall be firestopped using approved methods to maintain the fire resistance rating. The intent of this rule is to prevent the passing of products of combustion such as flame, excessive temperature and smoke through fire-rated construction. Incorrect answer. Please choose another answer.

41.	Given: A four (4) unit multifamily dwelling has a 14 kW, 240-volt, single-phase, electric range installed in each dwelling unit. Apply the general method of calculation for dwellings and determine the demand load, in kW, on the ungrounded (phase) service-entrance conductors for the electric ranges.
		A. 17.0 kW
		B. 18.7 kW
		C. 25.2 kW
		D. 56.0 kW
General method of calculation: When applying demand factors for household electric ranges all of the same rating over 12 kW through 27 kW, apply Note 1 and Column C of Table 220.55, which states we are to increase the Column C demand value by 5% for each kW that exceeds 12 kW. First find the portion that exceeds 12 kW: 14 kW - 12 kW = 2 kW Next multiply 2 kW by 5%: 2 KW x 5% = 10% increase in Column C demand value 17 kW (4 ranges - Column C demand value) X 10% = 1.7 kW increase 17 kW (Column C demand value) + 1.7 kW (increase) = 18.7 kW Incorrect answer. Please choose another answer.

42.	Refer to the previous question; apply the optional method of calculation for dwellings to determine the demand load, in kW, on the ungrounded service-entrance conductors for the electric ranges.
		A. 17.0 kW
		B. l8.7 kW
		C. 25.2 kW
		D. 56.0 kW
Optional method of calculation: Section 220.84 states it is permissible to calculate the load of a feeder or service that supplies three (3) or more dwelling units of a multifamily dwelling in accordance with Table 220.84. As per Section 220.84(C)(3)b. the calculated load to which Table 220.84 applies is based on the nameplate ratings of the electric ranges. Table 220.84 shows the demand factor for four (4) electric ranges is 45%. 14 kW x 4 ranges = 56 kW x 45% (demand factor) = 25.2 kW demand Incorrect answer. Please choose another answer.

43.	Where size 4/0 AWG multiconductor cables, rated for 2000 volts or less, are placed in a ladder type cable tray, what is the MAXIMUM fill area, in square inches, of 9 inch wide cable tray?
		A. 9 square inches
		B. 10 square inches
		C. 12 square inches
		D. 14 square inches
Column 1 of Table 392.22(A) indicates the maximum fill area of 9 in. wide ladder type cable tray to be 10 square inches Incorrect answer. Please choose another answer.

44.	Where installed for a commercial occupancy, determine the MINIMUM size THWN copper conductors required from the terminals of a 3-phase, 277/480-volt, 4-wire, 200 kW generator to the first distribution device(s) containing overcurrent protection. Assume the design and operation of the generator does NOT prevent overloading.
		A. 250 kcmil
		B. 300 kcmil
		C. 400 kcmil
		D. 500 kcmil
Section 445.13 specifies the ampacity of the conductors from the generator terminals to the first distribution device(s) containing overcurrent protection shall not be less than 115 percent of the name plate current rating of the generator. The first step is to determine the full-load current available at the generator terminals by applying the 3-phase current formula. 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 The next step is to calculate the required ampacity of the conductors. 241 amperes x 115% = 277 amperes (required ampacity of conductors) The final step is to select the proper size conductors from Table 310.15(B)(16). Size 300 kcmil THWN conductors with an allowable ampacity of 285 amperes should be selected. Incorrect answer. Please choose another answer.

45.	Enclosures containing circuit breakers, switches and motor controllers located in Class II, Division 2 locations, shall be _____ or otherwise identified for the location.
		A. gastight
		B. vapor-proof
		C. dusttight
		D. stainless steel
Class II, Division 1 and 2 locations are defined in Section 500.5(C) as "hazardous because of the presence of combustible dust." Therefore, Section 502.115(B) requires enclosures for circuit breakers, switches, and motor controllers to be dusttight or otherwise identified for the location where installed in a Class II, Division 2 location. Incorrect answer. Please choose another answer.

46.	An electrical system comprised of multiple power sources is known as _____.
		A. a legally required standby system
		B. an optional standby system
		C. an emergency system
		D. a hybrid system
Article 100 defines a hybrid system as a system comprised of multiple power sources. These power sources may include photovoltaic, wind, micro-hydro generators, engine-driven generators, and others, but do not include electrical production and distribution network systems. Incorrect answer. Please choose another answer.

47.	In _____ of dwelling units all 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets or devices are to be provided with AFCI protection. I. kitchens II laundry areas
		A. I only
		B. II only
		C. both I and II
		D. neither I nor II
The 2014 Edition of the NEC has expanded Section 210.12(A) to include kitchens and laundry areas of a dwelling in the list of locations to be provided with AFCI protection to provide increased safety by reducing the number of arcing events in dwellings. Incorrect answer. Please choose another answer.

48.	Given: A one-family dwelling to be built will have 4,000 sq. ft. of livable space, a 600 sq. ft. garage, a 400 sq. ft. open porch, a 2,000 sq. ft. unfinished basement (adaptable for future use), three (3) small-appliance branch-circuits and a branch circuit for the laundry room. Determine the demand load, in VA, on the ungrounded service-entrance conductors for the general lighting and receptacle loads using the standard method of calculation for a one-family dwelling.
		A. 10,350 VA
		B. 9,825 VA
		C. 7,350 VA
		D. 24,000 VA
To solve this problem take into consideration the following related information regarding calculations for dwelling units: 1) According to Section 220.12, a unit load of 3 VA as specified in Table 220.12 shall constitute the minimum lighting load. The calculation floor area shall not include garages and open porches. 2) As per Section 220.52(A), each small appliance circuit shall be calculated at 1,500 VA each. 3) Section 220.52(B) specifies a load of not less than 1,500 VA is to be included for the laundry branch circuit. 4) As permitted by Section 220.42, the demand factors specified in Table 220.42 shall apply to that portion of the total branch circuit load calculated for general illumination. Therefore, to calculate the demand load do the math as follows. 4,000 sq. ft. + 2,000 sq. ft. = 6,000 sq. ft. x 3 VA = 18,000 VA three small appliance circuits @ 1,500 VA each = 4,500 VA one laundry circuit @ 1,500 VA = 1,500 VA Total connected load = 24,000 VA 1st 3,000 VA @ 100% 3,000 VA 24,000 VA - 3,000 VA = 21,000 VA (remainder) @ 35% = 7,350 VA Total demand load = 10,350 VA Incorrect answer. Please choose another answer.

49.	Determine the MINIMUM size Type SOW flexible cord that may be used to supply a 30 hp, 3-phase, 480-volt, continuous-duty, ac motor from the motor controller to the motor terminations. Assume voltage-drop and elevated ambient temperature are not considerations.
		A. 4 AWG
		B. 6 AWG
		C. 8 AWG
		D. 10 AWG
In compliance with Section 430.6, where flexible cord is used to supply motors, the size of the conductors shall be selected in accordance with Section 400.5. For general motor applications, Section 430.6(A)(1) indicates the full-load current values given in Table 430.250 are to be used where sizing the conductors for a 3- phase ac motor. Section 430.22 requires conductors that supply a single motor used in a continuous duty application shall have an ampacity of not less than 125% of the motor full-load current rating. Locate the FLC of the motor, 40 amperes, as shown in Table 430.250, then as per Section 430.22 multiply by 125% to determine the required ampacity of the conductors to supply the motor. FLC of 30 hp motor = 40 amperes x 125% = 50 amperes Size 4 AWG SOW cord with an allowable ampacity of 60 amperes should be selected from Column A of Table 400.5(A)(1). Incorrect answer. Please choose another answer.

50.	Portable structures for fairs, carnivals and similar events shall not be located under or within a MINIMUM of _____ horizontally of conductors operating in excess of 600 volts.
		A. 22 feet
		B. 15 feet
		C. 10 feet
		D. 12 feet
As mandated by Section 525.5(B)(2), at fairs, carnivals and similar events, portable structures, which includes rides, attractions and vendor booths are not permitted within an area of 15 ft. horizontally of conductors operating in excess of 600 volts. This area extends from the overhead conductors down to grade level. Incorrect answer. Please choose another answer.

51.	Flexible cord and cables shall be permitted to be attached to building surfaces _____.
		A. under no circumstances
		B. where concealed
		C. where used as a substitute for the fixed wiring of a structure
		D. where the length of the cord or cable from a busway plug-in device to a suitable tension "take-up" support device does not exceed 6 feet
In general, flexible cords and cables are not permitted to be attached to building surfaces. However, the exception following Section 400.8(4), permits flexible cords and cables to be attached to building surfaces in accordance with the provisions indicated in Section 368.56, which provides the requirements for the installation of flexible cords installed as branches from busways. Section 368.56(B)(2) permits flexible cord and cables to be attached to building surfaces where the length of the cord or cable from a busway plug-in device to a suitable tension "take-up" support does not exceed 6 feet. Incorrect answer. Please choose another answer.

52.	In regard to outside branch circuits of overhead spans of open individual conductors for 1000 volts or less up to 50 feet in length, the NEC mandates the conductors to be NOT less than _____ copper in size.
		A. 12 AWG
		B. 10 AWG
		C. 8 AWG
		D. 6 AWG
Section 225.6(A)(1) requires overhead spans of open individual conductors of 1000 volts or less, and up to 50 ft. in length to be not less than 10 AWG copper in size. Incorrect answer. Please choose another answer.

53.	As defined in the NEC, a controller is any switch or device that is normally used to _____.
		A. start and stop a motor by making and breaking the motor circuit current
		B. start and stop a motor by making and breaking the control circuit current
		C. control a motor by making and breaking the overload circuit current
		D. disconnect or start a motor by any means
Section 430.2 defines a controller as any switch or device that is normally used to start and stop a motor by making and breaking the motor circuit current. Incorrect answer. Please choose another answer.

54.	The MINIMUM spacing required between live uninsulated metal parts in feeder circuits of 480-volt industrial control panels and bare metal parts of the enclosure is _____.
		A. 1/2 in.
		B. 3/4 in.
		C. 1 in.
		D. 1 in.
As per Section 409.106, the spacing requirements between live uninsulated metal parts in feeder circuits of 480-volt industrial control panels and bare metal parts of the enclosure shall be as shown in Table 430.97(D). This table indicates a clearance of not less than 1 inch must be maintained between the components. Incorrect answer. Please choose another answer.

55.	The insulated conductors of Type TC cables shall be in sizes _____ to 1000 kcmil copper, nickel, or nickel-coated copper.
		A. 18 AWG
		B. 16 AWG
		C. 14 AWG
		D. 12 AWG
Section 336.104 states, the insulated conductors of Type TC cables shall be in sizes 18 AWG to 1000 kcmil copper, nickel or nickel-coated copper. Incorrect answer. Please choose another answer.

56.	All swimming pool electric water heaters shall have the heating elements subdivided into loads not exceeding 48 amperes and protected at NOT over _____ .
		A. 45 amperes
		B. 50 amperes
		C. 55 amperes
		D. 60 amperes
All electric pool water heaters shall have the heating elements subdivided into loads not exceeding 48 amperes and protected at not over 60 amperes. Refer to Section 680.9. Incorrect answer. Please choose another answer.

57.	In regard to emergency and legally required standby systems, transfer switches shall be _____ and approved by the authority having jurisdiction.
		A. manual
		B. automatic
		C. nonautomatic
		D. red in color
Sections 700.5(A) and 701.5(A) require transfer switches to be automatic. Incorrect answer. Please choose another answer.

58.	Where Type SE service-entrance cable is used for interior wiring as a substitute for Type NM cable for branch circuits and feeders, and installed in thermal insulation, the ampacity shall be in accordance with the _____ conductor temperature rating.
		A. 40C
		B. 60C
		C. 75C
		D. 90C
According to Section 338.10(B)(4)(a), Type SE cable is only limited to operating at a 60C ampacity when it is installed in thermal insulation. Type SE cable is permitted to have conductors with either 75C or 90C insulation, and any adjustment or correction is to be based on the temperature rating of the conductors in the specific SE cable. If there is not temperature rating marked on the surface of the conductors, the conductors have a 75C insulation temperature rating, and ampacity adjustment or correction is based on that rating. Where Type SE cable is installed in thermal insulation, the adjusted and/or corrected ampacity of the conductors cannot exceed those shown in the 60C column of Table 310.15(B)(16). Incorrect answer. Please choose another answer.

59.	The continuity of a grounded conductor shall NOT depend on connection to a _____.
		A. metallic enclosure
		B. raceway
		C. cable armor
		D. any of these
Because grounded conductors are current-carrying, Section 200.2(B) requires grounded conductors be connected to a terminal or busbar that is specifically intended and identified for connection of grounded or neutral conductors. The continuity of a grounded conductor shall not depend on a connection to a metallic enclosure, raceway or cable armor. Connecting grounded conductors to a separate equipment grounding terminal or busbar (that is directly connected to a metal enclosure) results in the enclosure becoming a neutral conductor between the equipment grounding terminal and the point of connection for the grounded conductor. Incorrect answer. Please choose another answer.

60.	Where a receptacle outlet is removed from an underfloor raceway, the conductors supplying the outlet shall be _____ .
		A. capped with an approved insulating material
		B. taped off with red colored tape
		C. marked and identified
		D. removed from the raceway
In compliance with Section 390.8, where a receptacle outlet is removed from an underfloor raceway, the conductors supplying the outlet shall be removed from the raceway. Incorrect answer. Please choose another answer.

61.	What is the MINIMUM dimension required by the NEC for a working space containing exposed live parts on both sides of the equipment that will require examination and maintenance of the equipment when energized and operating at 480-volts between conductors?
		A. 4 feet
		B. 3 feet
		C. 6 feet
		D. 5 feet
The intent of Section 110.26(A) is to provide enough space for personnel to perform maintenance and examination of electrical equipment without jeopardizing worker safety. Examples of such equipment include panelboards, switchboards, motor control centers, motor controllers, disconnecting switches, and controls on heating and air-conditioning equipment. Where exposed live parts of the equipment, having a voltage to ground of 151-600 volts, are on both sides of the working space, Condition 3 of Table 110.26(A)(1) is to be applied. Under this condition the working space is required to be not less than 4 feet. Incorrect answer. Please choose another answer.

62.	Where a mobile home park has 25 mobile home lots calculated at 15,000 VA each, determine the MINIMUM required ampacity required for the ungrounded service-entrance conductors.
		A. 400 amperes
		B. 380 amperes
		C. 820 amperes
		D. 782 amperes
As required by Section 550.30, the secondary distribution system for a mobile home lot is to be single-phase, 120/240-volts. Section 550.31(1), mandates each mobile home lot is to be calculated at a minimum of 16,000 VA; this is the value to be used for this calculation. A demand factor of 24% is permitted to be applied as shown in Table 550.31. First determine the demand load: 25 lots x 16,000 VA (minimum) = 400,000VA " X .24 (demand factor) 96,000 VA (demand load) Next determine the load in amperes: I = power I = 96,000 VA = 400 amperes volts 240 volts Incorrect answer. Please choose another answer.

63.	Given: A 3-phase, 150 kVA transformer with a 208Y/120-volt secondary has an existing load of 212 amperes on each of the ungrounded phases. What is the MAXIMUM load, in amperes, that may be added to each of the ungrounded secondary phases?
		A. 416 amperes
		B. 180 amperes
		C. 204 amperes
		D. 250 amperes
First, apply the 3-phase current formula to find the full-load amperage rating of the transformer: I = kVA x 1000 I = 150 x 1000 = 150,000 = 416 amperes (FLA) E x 1.732 208 x 1.732 360.25 Next, subtract the existing load from the transformer FLA: 416 amperes (transformer FLA) - 212 amperes (existing load) = 204 amperes (additional load) Incorrect answer. Please choose another answer.

64.	In regard to an isolated grounding type receptacle, the reason the insulated isolated grounding conductor is not bonded to the outlet box is _____ .
		A. for the reduction of electrical noise
		B. to insure the circuit breaker will trip in the event of a ground-fault
		C. to prevent the circuit breaker from tripping in the event of a ground-fault
		D. for the reduction of voltage-drop
The reason the insulated isolated grounding conductor of isolated receptacles is not bonded to the box is for the reduction of electrical noise (electromagnetic interference) on the grounding circuit. This conductor may originate in the service panel, pass through any number of subpanels without being connected to the equipment grounding bus, and terminate at the isolated-ground-type receptacle ground terminal. Reference Section 250.146(D). Incorrect answer. Please choose another answer.

65.	Branch circuits that supply electric signs containing fluorescent lighting ballasts shall be rated NOT to exceed _____.
		A. 30 amperes
		B. 25 amperes
		C. 20 amperes
		D. 15 amperes
According to Section 600.5(B)(2) branch circuits that supply electric signs with incandescent or fluorescent lighting are limited to ratings of 20 amperes. Incorrect answer. Please choose another answer.

66.	Type CMP communications cable of NOT more than ____ in length shall be permitted in ducts used for environmental air if they are directly associated with the air distribution system.
		A. 8 feet
		B. 6 feet
		C. 4 feet
		D. 2 feet
Section 800.113(B)(1) permits Type CMP communications cables of not more than 4 ft. in length to be installed in fabricated ducts used for environmental air if they are directly associated with the air distribution system. Incorrect answer. Please choose another answer.

67.	The disconnecting switch or circuit breaker for electric signs and outline lighting systems shall open all _____ conductors simultaneously on multi-wire branch circuits supplying the sign or outline lighting system.
		A. grounded and ungrounded
		B. grounded, ungrounded and grounding
		C. grounding, ungrounded and bonding
		D. ungrounded
As per Section 600.6 the switch or circuit breaker for electric signs and outline lighting systems shall open all ungrounded (phase) conductors on multi-wire branch circuits. This rule complies with the rule mandated in Section 210.4(B). Incorrect answer. Please choose another answer.

68.	In dwelling units, hallways of at LEAST _____ or more in length shall have at least one 125-volt, 15- or 20-ampere receptacle provided.
		A. 6 feet
		B. 10 feet
		C. 12 feet
		D. 20 feet
The primary objective of Section 210.52(H) is to minimize the need to use extension cords to supply utilization equipment and to minimize the strain or damage to cords and receptacles for dwelling unit receptacles. Incorrect answer. Please choose another answer.

69.	Where constant wattage heating cables are installed in concrete floors, the cables shall NOT exceed ____ per linear foot per cable.
		A. 30 watts
		B. 54 watts
		C. 16 watts
		D. 37 watts
Where constant wattage heating cables are installed in concrete floors, Section 424.44(A) requires the heating cables to not exceed 16 watts per linear foot of cable. Incorrect answer. Please choose another answer.

70.	In general, the NEC does not mandate the maximum number of circuit breakers a panelboard may contain. An exception to this rule is ______, which is limited to no more than 42 overcurrent protection devices.
		A. a delta-connected panelboard
		B. a split-bus panelboard
		C. a 3-phase panelboard
		D. panelboards containing overcurrent protection devices rated only 30 amperes or less
Exception No. 2 following Section 408.36, limits a panelboard protected on its supply side by two main circuit breakers or two sets of fuses having a combined rating not greater than that of the panelboard, to no more than 42 overcurrent devices. This type of panelboard (split-bus) is commonly installed for dwelling units. Incorrect answer. Please choose another answer.

71.	When the water reaches the height of the established electrical datum plane for an irrigation pond, the service equipment must ______.
		A. be installed in a NEMA 6 enclosure
		B. float
		C. be installed in a NEMA 6P enclosure
		D. disconnect
In regard to an irrigation pond, to prevent damage to equipment and motors, when the water level reaches the height of the established electrical datum plane, the service must disconnect. Reference Section 682.11. Incorrect answer. Please choose another answer.

72.	General-use dimmer switches shall ONLY be used to control _____, unless listed for the control of other loads.
		A. permanently installed incandescent luminaires
		B. fluorescent luminaires
		C. temporary luminaires
		D. ceiling suspended (paddle) fans
Section 404.14(E) clarifies general-use dimmer switches are not permitted to control receptacles, cord-and-plug-connected table and floor lamps, ceiling fans, or fluorescent luminaires. They are only to be used to control permanently installed incandescent luminaires. Incorrect answer. Please choose another answer.

73.	Lampholders shall be constructed, installed, or equipped with shades or guards so that combustible material is not subjected to temperatures in EXCESS of ______.
		A. 130 degrees F
		B. 140 degrees F
		C. 162 degrees F
		D. 194 degrees F
The purpose of Section 410.97 is to prevent igniting combustible material near lampholders. Incorrect answer. Please choose another answer.

74.	Pendant conductors having a length of at LEAST ______ or more shall be twisted together where not cabled in a listed assembly.
		A. 3 feet
		B. 4 feet
		C. 5 feet
		D. 6 feet
Section 410.54(C) states pendant conductors longer than 3 ft. shall be twisted together where not cabled in a listed assembly. This rule ensures pendant conductors are installed in a neat and workmanlike manner. Incorrect answer. Please choose another answer.

75.	When installed in a metal enclosure, the grounding electrode conductor for a Type 1 surge-protective device (SPD) of 1 kV or less shall be _____.
		A. a minimum size of 12 AWG copper
		B. a minimum size of 6 AWG
		C. removed
		D. bonded to both ends of the enclosure
As per Section 285.28 grounding electrode conductors installed in metal enclosures housing a SPD shall comply with the requirements of Section 250.64(E). This section requires the housing to be made electrically continuous by bonding both ends to the grounding electrode conductor. Incorrect answer. Please choose another answer.

76.	At least one structural member of a building or structure that is direct contact with the earth for at LEAST _____ or more, with or without concrete encasement shall be permitted to be used as a grounding electrode.
		A. 20 feet
		B. 8 feet
		C. 10 feet
		D. 6 feet
As specified by Section 250.52(A)(2)(1), the metal frame of a building or structure can qualify as a grounding electrode if there is structural steel in direct contact with the earth for at least 10 ft. or if the structural steel is encased in concrete in direct contact with the earth for at least 10 ft. Incorrect answer. Please choose another answer.

77.	The circuit supplying an autotransformer-type dimmer installed in theaters and similar places shall NOT exceed _____ between conductors.
		A. 480 volts
		B. 277 volts
		C. 250 volts
		D. 150 volts
Circuits supplying autotransformer-type dimmers are not permitted to exceed 150 volts between conductors. With this type dimmer, any desired voltage may be applied to the lamps of luminaires, from full-line voltage to voltage so low that the lamps provide no illumination by means of a movable contact tap. This type of dimmer produces very little heat and operates at high efficiency. Reference Section 520.25(C). Incorrect answer. Please choose another answer.

78.	A twelve (12) unit apartment building will have a 5,500 watt electric clothes dryer placed in each apartment. Apply the general method of calculation and determine the demand load, in VA, on the ungrounded service-entrance conductors for the dryers.
		A. 49,500 VA
		B. 33,000 VA
		C. 30,360 VA
		D. 66,000 VA
Use Table 220.54 and first find the demand factor, in percent, for 12 dryers: 47% - 1% (minus 1% for each dryer exceeding 11) = 46% demand factor 12 dryers x 5,500 watts = 66,000 VA (connected load) x 46% = 30,360 VA demand Incorrect answer. Please choose another answer.

79.	Each luminaire installed in Class III, Divisions 1 and 2 locations shall be clearly marked to show the maximum wattage of the lamps that shall be permitted without exceeding an exposed surface temperature of _____ under normal conditions of use.
		A. 329F
		B. 165F
		C. 144F
		D. 125F
As per Section 503.130(A), luminaires installed in Class III, Divisions 1 and 2 are to be marked to show the maximum wattage of the lamps that shall be permitted without exceeding an exposed surface temperature of 329F. This rule is in place to prevent the overheating of luminaires which may cause igniting combustible fibers/flyings that are present in Class III locations. Fibers/flyings are hazardous not only because they are easily ignited, but also flames spread through them quickly. Such fires travel with a rapidity approaching an explosion and are commonly called flash fires. Incorrect answer. Please choose another answer.

80.	Conductors supplying a continuous-rated, varying-duty motor shall have an ampacity of NOT less than _____ of the motor nameplate current rating.
		A. 125 percent
		B. 140 percent
		C. 150 percent
		D. 200 percent
Most motor applications are continuous duty, meaning they operate at a constant load for an indefinitely period of time. For motors that are not continuous duty, the motor nameplate current rating and Table 430.22(E) are used to determine the branch circuit ampacity. This table indicates conductors supplying a continuous- rated, varying duty motor shall have an ampacity of at least 200% of the motor nameplate current rating. Incorrect answer. Please choose another answer.

81.	What is the MAXIMUM spacing allowed for supporting Type MC cable with size 12 AWG conductors where used as a branch circuit in a manufactured wiring system?
		A. 3 feet
		B. 5 feet
		C. 6 feet
		D. 10 feet
Section 330.30(B) contains the general requirements for supporting and securing Type MC cable. It must be secured at least every 6 ft. Incorrect answer. Please choose another answer.

82.	Receptacles or receptacle cover plates supplied from the essential electrical system in a hospital, shall be identified by _____ .
		A. brown in color
		B. white in color
		C. distinctive color or marking
		D. an orange triangle
Cover plates or the receptacles themselves are required to be identified where supplied by the essential electrical system in a hospital. This identification requirement applies to all receptacles supplied by the life safety and critical branches of the hospital essential electrical system. The NEC does not address a specific method of identification required, but the color red is used in many health care facilities to identify receptacles supplied by the essential electrical system. Reference Section 517.30(E). Incorrect answer. Please choose another answer.

83.	What is the MAXIMUM standard size circuit breaker that may be used for overcurrent protection of size 4/0 AWG THWN copper conductors that are not serving a motor load?
		A. 200 amperes
		B. 225 amperes
		C. 230 amperes
		D. 250 amperes
Table 310.15(B)(16) shows size 4/0 AWG THWN copper conductors to have an allowable ampacity of 230 amperes. Since this value does not correspond with a standard size overcurrent protective device, according to Sections 240.4(B)(2)&(3), you are permitted to go up to the next standard size rating of 250 amperes as indicated in Section 240.6(A). Incorrect answer. Please choose another answer.

84.	A multiwire branch circuit supplying a motor fuel dispensing pump, shall be provided with a switch that will disconnect _____ .
		A. only one ungrounded supply conductor
		B. all of the ungrounded supply conductors only
		C. only the neutral (grounded) conductor
		D. the grounded conductor and all of the ungrounded supply conductors
All conductors of a branch circuit, including the grounded conductor, supplying a motor fuel dispensing pump, must be provided with a switch or special-type circuit breaker that simultaneously disconnects all conductors. The intent of the rules specified in Section 514.11(A) is that no energized conductors are in the fuel dispenser vicinity during maintenance or inspection. Incorrect answer. Please choose another answer.

85.	The depth of the working space in front of a 120-volt, single-phase, fire alarm control panel (FACP) is required to be at LEAST _____.
		A. 2 feet
		B. 3 feet
		C. 3 feet
		D. 4 feet
The purpose of Table 110.26(A)(1) is to provide enough working space in front of electrical equipment for personnel to perform maintenance and inspections without jeopardizing worker safety. This table indicates where the voltage to ground present is not more than 150 volts, a minimum clear distance required in front of the equipment is 3 ft. Incorrect answer. Please choose another answer.

86.	Where an air conditioning unit is supplied with size 6 AWG CU conductors installed in a PVC conduit and protected by a 60 ampere circuit breaker, the MINIMUM size CU equipment grounding conductor permitted for this installation is _____ .
		A. 12 AWG
		B. 10 AWG
		C. 8 AWG
		D. 6 AWG
Equipment grounding conductors are to be sized in accordance with Table 250.122, based on the rating or setting of the overcurrent device ahead of the equipment. In this situation, the overcurrent protective device is rated 60 amperes, therefore the minimum size copper equipment grounding required is 10 AWG. Incorrect answer. Please choose another answer.

87.	Which of the following is NOT required to be marked on the nameplate of a transformer?
		A. overcurrent protection
		B. manufacturer
		C. kVA rating
		D. voltage
Section 450.11(A) recognizes the information given on the nameplate of a transformer includes the manufacturer, the kVA rating of the transformer and the voltage. The overcurrent protection is not required to be marked on the transformer nameplate. Incorrect answer. Please choose another answer.

88.	When combination surface nonmetallic raceways are used for both signaling and for power and lighting circuits, the different systems shall be _____.
		A. prohibited
		B. run in the same compartment
		C. run in separate compartments
		D. maintain a spacing of at least in.
A combination surface nonmetallic raceway is used primarily to contain conductors to supply power to receptacles, CATV and communications outlets, therefore, the different systems are required to be run in separate compartments. Reference Section 388.70. Incorrect answer. Please choose another answer.

89.	Where explosionproof equipment is provided with metric threaded entries, which of the following methods is approved to adapt the entries from metric threads to NPT threads?
		A. Approved adapters from metric threads to NPT threads shall be used.
		B. Tap the metric threaded entries to NPT threads.
		C. Thread the conduit with metric threads.
		D. All of these are approved methods.
To ensure the explosionproof integrity of the conduit system, where the explosion-proof equipment is provided with metric threaded entries, Section 500.8(E)(2) mandates approved adapters from metric threads to NPT (National Standard Pipe Taper) threads shall be used. Incorrect answer. Please choose another answer.

90.	An indoor located 100 kVA, dry-type transformer with a 4,160-volt primary is required to have a clearance of at LEAST _____from combustible material.
		A. 6 inches
		B. 10 inches
		C. 12 inches
		D. 8 inches
Section 450.21(A) requires transformers rated for more than 1000 volts and not over 112 kVA to have a clearance of not less than 12 in. from combustible material. Incorrect answer. Please choose another answer.

91.	A clearance of NOT less than _____ must be maintained from the maximum water level of a permanently installed swimming pool and messenger-supported tri-plex service-drop conductors of 0-750 volts.
		A. 10 feet
		B. 14 feet
		C. 19 feet
		D. 22 feet
In order to maintain a safe distance from the water level of a swimming pool to conductors of 0-750 volts, Table 680.8(A) indicates a clearance of at least 22 ft. is required. Incorrect answer. Please choose another answer.

92.	Where an apartment complex has a calculated connected lighting load of 205.4 kVA, what is the demand load, in kVA, on the ungrounded service-entrance conductors where applying the standard (general) method of calculation? Given: Each dwelling unit in the complex has cooking facilities provided.
		A. 58.9 kVA
		B. 60.2 kVA
		C. 16.5 kVA
		D. 65.3 kVA
The demand factors specified in Table 220.42 may be applied to calculate the general lighting demand loads for dwelling units. First, convert into VA: 205.4 kVA x 1,000 = 205,400 VA Next, apply the values given in Table 220.42: first 3,000 VA @ 100% = 3,000 VA 3,001 to 120,000 VA @ 35% = 117,000 VA @ 35% = 40,950 VA remainder 205,400 VA - 120,000 VA = 85,400 VA @ 25% = 21,350 VA Demand = 65,300 VA Finally, determine the kVA: 65,300 VA = 65.3 kVA 1,000 Incorrect answer. Please choose another answer.

93.	Cord-and-plug connected high-pressure spray washing machines shall be provided with GFCI protection for personnel when operating at _____. I. single-phase, 120-volts, 30 amperes II. 3-phase, 208-volts, 50 amperes
		A. I only
		B. II only
		C. either I or II
		D. neither I nor II
The GFCI protection requirements for high-pressure spray washers are addressed in Section 422.29. This requirement was initiated because at least ten documented electrocutions have been linked to nonindustrial high pressure spray washing machines of the type purchased by, or rented to consumers. These cord-and-plug connected machines present shock hazards to users in wet conditions. The same shock hazard exist for 3-phase machines as for single-phase. However, at this date, there are no 3-phase, 240-volt listed GFCI devices available to be located in the attachment plug or in the cord of the appliance, or listed GFCI devices intended for use on circuits operating greater than 150-volts to ground. Incorrect answer. Please choose another answer.

94.	For the purpose of sizing branch circuits for fixed storage-type water heaters with a capacity of 120 gallons or less, the water heater shall be considered ____ .
		A. a continuous load
		B. an intermittent load
		C. a noncontinuous load
		D. a short-time load
Section 422.13 recognizes fixed storage-type water heaters with a capacity of 120 gallons or less, may be operated at an indefinite period of time; therefore, they are considered a continuous load. Incorrect answer. Please choose another answer.

95.	When supplying a 36,000 VA, 240-volt, single-phase load in an area where the ambient temperature reaches 119F, determine the MINIMUM size 75C rated copper conductors required to supply the load.
		A. 1/0 AWG
		B. 2/0 AWG
		C. 3/0 AWG
		D. 4/0 AWG
First, apply the single-phase current formula to determine the load in amperes: I = power I = 36,000 VA = 150 amperes load volts 240 volts Next, due the elevated temperature, divide the load of 150 amperes by .75, the temperature correction factor given in Table 310.15(B)(2)(a): required ampacity = 150 amperes = 200 amperes .75 Then, size 3/0 AWG 75C copper conductors with an allowable ampacity of 200 amperes should be selected from Table 310.15(B)(16). Incorrect answer. Please choose another answer.

96.	Color coding shall be permitted to identify intrinsically safe conductors where they are colored ____ and where no other conductors of the same color are used.
		A. light blue
		B. orange
		C. yellow
		D. purple
Color coding shall be permitted to identify intrinsically safe conductors where they are colored light blue and where no other conductors of the same color are used. Reference Section 504.80(C). Incorrect answer. Please choose another answer.

97.	For an overhead type motor fuel dispensing device, the space within the dispenser enclosure shall be classified as a _____ location.
		A. Class I, Division 1
		B. Class I, Division 2
		C. Class II, Division 1
		D. Class II, Division 2
Table 514.3(B)(1) indicates the space within an overhead motor fuel dispensing enclosure and all electrical equipment integral with the dispensing hose or nozzle, is classified as a Class I, Division 1 hazardous location. Incorrect answer. Please choose another answer.

98.	Where exceptions are not to be applied, determine the MINIMUM required length of a junction box that has a trade size 3 in. conduit containing four (4) size 250 kcmil conductors, pulled through the box for a 90 angle pull.
		A. 21 inches
		B. 24 inches
		C. 28 inches
		D. 34 inches
Where splices or angle pulls of conductors of size 4 AWG or larger are made in junction boxes, Section 314.28(A)(2) requires the distance inside the box and the opposite wall shall not be less than six (6) times the trade size of the largest raceway entering the box.3.5 inches (conduit) x 6 = 21 inches Incorrect answer. Please choose another answer.

99.	An approved method of protection for equipment installed in Class I, Zone 0, hazardous locations is _____ .
		A. purged and pressurized
		B. encapsulation
		C. powder filling
		D. oil immersion
The encapsulation technique is a protection method in which the arcing, sparking, or hot parts are completely surrounded in a compound in such a way that an explosive gas or vapor cannot be ignited. Section 505.8(G) permits this protection technique to be used for equipment in Class I, Zone 0, hazardous locations. Incorrect answer. Please choose another answer.

100.	Electrical service and feeder conductors for electrified truck parking spaces at a truck plaza shall be calculated on the basis of NOT less than _____ per electrified truck parking space.
		A. 11 kVA
		B. 12 kVA
		C. 15 kVA
		D. 18 kVA
In order to provide adequate power requirements for electrified truck parking space systems, each electrified truck parking space is to be calculated at 11 kVA when sizing feeder or service conductors. Reference Section 626.11(A). Incorrect answer. Please choose another answer.