study - copy
1. Which one of the following applies when electrical wiring is concealed without inspection?
The person responsible for enclosing the wiring shall be responsible for all costs resulting from uncovering and replacing the cover material.
2. In a commercial building, what is the minimum size NM-B cable that can be used to supply a
115/230 volt air conditioner heat pump when the nameplate shows the rated load current to be 15.2 amps with a 25 amp max fuse or HACR circuit breaker?
14/3 w/ground
3. Which one of the following terms is used for the connection between the grounded circuit conductor and the supply-side bonding jumper, or the equipment grounding conductor, or both, at a separately derived system?
The system bonding jumper
4. In addition to a separate branch circuit to supply the lighting or receptacles) in an elevator machine room or control room/ machinery space, which of the following applies?
The space shall have at least one 125v, single phase, 15 or 20 amp duplex receptacle outlet with gfci protection.
A site plan is drawn to a scale of one inch equals 40 feet (1"=40'). What is the corresponding distance between two points where the measured dimension on the site plan is 5 7/8 inches?
235'
Refer to Figure 18 in the diagram booklet. The drawing shows the finish material of a clothes closet. A recessed LED luminaire with totally enclosed light source is installed in the ceiling of a clothes closet shown in Figure 18. A 10 inch wide shelf will be installed on the back of side walls of the closet. What is the minimum dimension represented by "X"?
6"
Excluding exceptions, which of the following is NOT a requirement for the disconnecting means for the ballasts for fluorescent luminaires?
The branch circuit overcurrent device located within sight of the luminaire or capable of being locked in the open position shall be permitted as the required disconnecting means.
Which one of the following applies when a receptacle located above the countertop and within 3 feet of the outside edge of the basin of a dwelling unit bathroom is replaced if the existing wiring method does not include an equipment grounding conductor that complies with Section 250.118?
A replacement non-grounding type receptacle shall be permitted to be installed where gfci protection is provided and the receptacle is marked "GFCI Protected" and "No Equipment Ground."
A two-story, one family dwelling has usable floor area based on outside dimensions of
36'x40'. What is the minimum number of 15-ampere, two wire, 120 volt general lighting branch circuits required? (Do not include small appliance or laundry circuits.)
5 circuits
10. Which one of the following wiring methods may be used where flexibility is needed at an outdoor hot tub on a deck attached to a one family dwelling?
Type MC cable with a covering impervious to moisture.
A 75 kva transformer with a 480 volt, three wire, delta connected primary and a 120/208 volt , four wire, wye connected secondary supplies a 200 ampere lighting and appliance branch circuit panelboard. Which one of the following provides the required overcurrent protection for the panelboard?
The panelboard shall be protected on the supply side at not more than 200 amperes.
Refer to Figure 9 in the Diagram Booklet. When the secondary voltage in a three phase, four wire, wye connected transformer bank is 480 volts phase to phase, what is the voltage between the ungrounded conductors and the grounded conductor?
277
Which one of the following requirements applies to unlicensed electrical workers?
They must always carry the registration card issued by the department when performing electrical work and must present it to department representatives or electrical inspection authorities upon request.
Which one of the following applies to an intersystem bonding termination?
Where an intersystem bonding termination exists on the premises, it must be used for the termination of communication system grounding conductors.
An EMT raceway containing five 20 ampere, 120 volt multi-wire branch circuits supplying electric hand dryers is routed from a 120/208 volt, three phase panelboard. The branch circuit overcurrent devices are arranged within the panelboard such that a minimum number of circuit conductors are required. For the purpose of applying the ampacity adjustment factors of Table 310.15(B)(3)(a), what is the minimum number of current carrying conductors that must be considered?
6
Which one of the following statements applies to remote control, signaling and power-limited circuits?
Class 1 remote-control and signaling circuits shall not exceed 600 volts
Which one of the statements defines the Class 1, Division 2 locations at or around the outdoor dispensing devices (not overhead type) at a motor fuel dispensing facility?
Within 18" horizontally in all directions extending to grade from the dispenser enclosure
or that portion of the dispenser enclosure containing liquid handling components and up to 18" above grade level within 20' horizontally of any edge of enclosure.
In addition to non-power limited fire alarm (NPLFA) wiring, which one of the following circuit types is NOT permitted in the same raceway or cable with power-limited fire alarm (PLFA) circuits?
Class 1 circuits
Refer to Figure 19 in the Diagram Booklet. The drawing represents an 800 ampere, 277/480 volt, three phase service installed in a single occupancy building. The service entrance conductors consist of two paralleled 750 kcmil aluminum conductors per phase installed in two trade size 5" raceways. What size is the copper supply side bonding jumper installed in the two service entrance conduits?
1/0 AWG
20. Which one of the following wiring methods may be installed in holes bored in joists, rafter or wood members where there is less than 1¼ inches of material to the nearest edge of the wood member without protection from a steel plate or bushing?
Electrical Metallic Tubing: Type EMT
A 40 HP, 3 phase, continuous duty, induction type squirrel-cage motor with a service factor rating of 1.15; a power factor rating of 85; and a nameplate rating of 208-230/460 volts; 101-
94/47 amperes is supplied by a 480v branch circuit. What is the required minimum branch circuit conductor ampacity?
65 amperes
A 20 inch long PVC Schedule 40 conduit is installed vertically from a 200 ampere panelboard located in the basement of a dwelling. A fitting is installed on the outer end of the raceway.
The following cables are installed in the raceway: three 14-2 Type NM that are elliptical in cross section and each measure .162 inches, three 12-2 NM that are elliptical in cross section and each measure .179 inches; one 10-2 Type NM that is elliptical in cross section and measures .492 inches; one 10/3 Type NM cable that measures .422 inches in diameter; and one 8-3 Type NM cable that measures .680 inches in diameter. What minimum trade size conduit is required for the cables?
2
A 50 ampere, 125/250 volt straight blade receptacle is installed in a metal outlet box fitted with a two gang plaster ring with a 4.5 cubic inch volume. The outlet is supplied by a 50 ampere branch circuit extended using Type SE cable. The cable includes 3- #6 AWG circuit conductors and one 6 AWG EGC. The cable is secured to the box with a separate non-metallic sheathed cable connector. What is the minimum cubic inch volume required for the box and plaster ring assembly?
35.5 cu in
Refer to Figure 17 in the Diagram Booklet. The drawing represents the family room in a one-family dwelling. If "x" is 12' and "y" is 16'. What is the minimum number of required receptacles?
5
Which one of the following applies to the disconnection means for a branch circuit or feeder to a separate structure?
It shall be a circuit breaker, molded case switch, general use switch, snap switch or other approved means
Which one of the following statements regarding inspection of electrical work is true?
At or before commencement of any installation required to be inspected, the contractor, installer, special electrician, or owner making the installation shall submit to the commissioner a request for inspection
Refer to Figure 1 in the Diagram Booklet. What is the power consumed by resistor #3?
5 watts
Unless identified barriers are securely installed between the adjacent devices, snap switches, that are grouped or ganged in the same enclosure with other snap switches, receptacles, or similar devices shall be arranged so that the voltage between adjacent devices does not exceed:
300 volts
Which one of the following applies to an outlet installed for the purpose of charging an electric vehicle?
Shall be supplied by a separate(individual) branch circuit.
30. A 480v three phase feeder circuit supplies the following, continuous duty, induction type, alternating-current motors. 3-30 hp with nameplate rating of 230/460 v, 78/39 amps
1-20 hp with nameplate rating of 230/460 v, 48/24 amps
2-7.5 hp with nameplate rating of 230/460 v, 18.8/9.4 amps
What is the minimum size Type THWN copper conductor required for the feeder?
3/0 AWG
Which one of the following requirements applies to a licensed electrical contractor?
Contractor's name as it appears on the contractor's license shall be provided in any advertisement or printed matter that offers or implies the performance of electrical work
Which one of the following is the purpose for installing a minimum size #8 solid copper conductor bonding the metallic structural components, underwater lighting, electrical equipment and metal wiring methods associated with swimming pools?
To form the equipotential grid to reduce voltage gradients in the pool area
Which one of the following applies where premises wiring includes branch circuits supplied from more than one nominal voltage?
Where grounded conductors of different systems are installed in the same raceway, cable, box, auxiliary gutter, or other type of enclosure, each grounded conductor shall be identified by system and the means of identification shall be documented that is readily available or permanently posted where the conductors of different systems originate
Which of the following applies where a building supplied with electrical service also had a water supply from a metal underground water pipe in direct contact with the earth for 10 feet or more?
If a rod, pipe or plate electrode is the only type electrode available to supplement a metal underground water pipe and has a resistance to earth of more than 25 ohms, it must be supplemented by another rod, pipe or plate electrode
Refer to Figure 22 in the Diagram Booklet. Which one of the following correctly describes a requirement for the dedicated electrical space for electrical equipment installed indoors?
The dedicated space is equal to the width and depth of the equipment extending from the floor to a height of the structural ceiling or 6 feet above the equipment, whichever is lower
In which one of the following is a non-locking type 125 volt, 15 and 20 ampere receptacles required to be tamper-resistant?
A duplex receptacle located above a side-by-side clothes washer and dryer in a dwelling unit
Which one of the following applies to equipment grounding conductors?
They are never required to be larger than the ungrounded conductors) of the circuit.
Which one of the following applies to overhead wiring in those areas of a marina that can be used for moving vessels?
The clearance shall not be less than 20 feet.
An individual dwelling unit within a multifamily dwelling has a load of 25.9 kVA calculated in accordance with Article 220. The service is supplied by a 120/240 volt, single phase system. What is the minimum size Type THWN-2 copper conductor permitted for the feeder conductors supplying this individual dwelling unit?
2 AWG
Which one of the following applies to the installation of the receptacle outlet with ground-fault circuit-interrupter (GFCI) protection supplied by a 20-ampere branch circuit in dwelling unit bathrooms?
The receptacle outlets) may be installed on the side or face of the basin cabinet not more than 12 inches below the countertop.
What is the maximum number or 4/0 AWG type XHHW-2 compact aluminum conductors that may be installed in a trade size 2 ½" Schedule 80 Rigid PVC conduit (not a nipple)?
6
Which one of the following applies where physical contact occurs between conductors of dissimilar metal, such as copper and aluminum?
Connections of dissimilar metal is permitted and shall be made with connectors identified for the purpose and conditions of use
Which one of the following statements does not apply to a multiwire branch circuit?
A multiwire branch circuit is a circuit consisting of two or more conductors supplied by a three phase system
Which item in the following list is acceptable toward the minimum qualifying experience requirement for the journeyman exam?
Experience gained while working in Minnesota for an employer who is not required to be licensed as a contractor when the work is inspected and done under the supervision of a properly licensed electrician
Which one of the following is the minimum conductor ampacity of a 22 foot tap when the feeder is protected by a 600 ampere overcurrent protective device?
200 ampere rated conductor
50. Under which one of the conditions listed below is the next higher standard overcurrent device rating (above the ampacity of the conductors being protected) permitted to be used?
The conductors being protected are not a part of a branch circuit suppling more than one receptacle for cord-and-plug-connected portable loads
Which one of the following enclosures or raceways is NOT suitable for the protection of conductors emerging from the ground where the enclosure or raceway is exposed and subject to physical damage?
High Density Polyethylene conduit: Type HDPE
In which one of the following is the installation of a 3 pole circuit breaker marked 100 ampere,
480Y/277 volts permitted.
A 480 volt 3-wire branch circuit supplied by a 480/277 volt wye-connected system
Which of the following wiring method is NOT permitted to be used where subject to physical damage?
Liquidtight Flexible Metal Conduit: Type LFMC
A trade size 1" rigid polyvinyl chloride conduit is installed exposed in the first level of a four level outdoor parking ramp. The conduit extends 115 feet in a straight line between two junction boxes.
The conduit is installed when the outside temperature is 60F. The anticipated minimum temperature is -30F and the maximum anticipated temperature is 105F. Based on the temperature at installation, what is the anticipated expansion or contraction of the conduit?
The conduit will expand more than 2 inches.
55. Which one of the following applies to the overcurrent device for the conductors supplying one or more electric welders?
The device shall be rated or set at no more than 200% of the conductor ampacity.
56. Refer to Figure 4 in Diagram Booklet. Without taking single phase transformer losses into consideration, if Ammeter A-1 reads 10 amperes and Ammeter A-2 amperes reads 17 amperes. What is the Ammeter reading at A-N?
5 AMPERES
57. To the closest whole number, what is the maximum allowable ampacity of a four conductor feeder with 1/0 Type THWN copper conductors installed in a metal raceway to supply a three phase, 200-ampere panelboard in a boiler room with an ambient temperature of 124°F? The feeder is protected by a 275 ampere overcurrent device and the branch circuits in the panelboard supplying non- linear loads.
81 amperes
58. Under which circumstance could a class 2 power limited cable to be installed in the same raceway as 120/240 volt power circuit conductors?
When the cable is separated from the power conductors by a barrier.
59. Which one of the following applies to ground fault protection of equipment?
It is intended to disconnect all ungrounded conductors for line to ground faults.
60. Refer to Figure 21 in Diagram booklet. What is the minimum required working space represented by the letter Y? There is a 277/480 panelboard with electrical equipment on both sides of the aisle.
4 ft
61. In which one of the following conditions are conductors NOT considered as being outside the building or other structure?
Where installed behind, or within a wall or shaft with a minimum of a 2 hour fire rating.
62. Where electrical work is required to be performed by licensed individuals, which one of the following applies to unlicensed individuals?
Unlicensed individuals are required to maintain a current registration with the Department of Labor and Industry.
63. Refer to Figure 20 in the diagram Booklet PP-1, PP-2, PP-3 include service disconnects as allowed by Sections 230.40 Exception 2. The main circuit breakers in panels PP-1 and PP-2 are rated 400 amperes and supplied by four 500 kcml copper conductors. Which of the following correctly identifies the minimum size copper common grounding electrode conductor and the grounding electrode tap conductor to PP-1 and PP-2?
2/0 AWG common grounding electrode conductor and 1/0 AWG grounding electrode tap conductor.
64. Openings around electrical raceway and cable penetrations into or through fire-resistant rated walls, partitions, floors or ceilings shall be.
fire stopped using approved materials to maintain the fire-resistance rating.
65. Which one of the following terms is used for the conductor that connects the system grounded conductor or the equipment to a grounding electrode or to a point on the grounding electrode system?
The grounding electrode conductor.
66. Refer to Figure 10 in the Diagram booklet. Which one of the following is correct when the drawing represents a 120/240 volt, three-phase four wire delta connected system?
The voltage between the B phase and the grounded conductor is 208 volts.
67. All phase conductors, and where used, the grounded circuit conductor and all equipment grounding conductors are required to be grounded together when installed in metal raceways or metal enclosures. Which one of the following is the reason for this requirement?
To avoid heating the surrounding metal by induction.
68. The following Type NM cables are extended from a service panel in a dwelling unit through a single opening in the bottom plate of an outside wall of the structure: one 12-3 Type NM cable for two small appliance branch circuits; one 10-2 Type NM cable for an air conditioner circuit; and a 10-3 Type NM cable for a 125/ 250 volt electric clothes dryer circuit. The opening in the bottom plate is draft stopped using expanding foam sealant. What, if any, ampacity adjustment factor applies?
70%
69. Which one of the following terms is used for the conductor used to connect the system grounded conductor or the equipment to a grounding electrode or to appoint on the grounding electrode system?
Grounding electrode conductor.
70. A four-gang non-metallic box with internal cable clamps is installed in a bathroom of a new one family dwelling. There are two single pole switches and a three way switch connected to a 25 ampere circuit, and a duplex receptacle connected to 20 ampere circuit installed in the box. Three 12-2 Type NM cables, four 14-2 Type NM cables and three 14-3 Type NM cables enter the box. What is the minimum volume required for this box?
71.875 cubic inches
71. A commercial occupancy has a 225 ampere, 277/480 volt service. The service entrance conductors are 300 kcmil Type XHHW aluminum. What is the minimum size copper grounding electrode conductor required for the connection to a concrete encased electrode?
4 AWG
72. Which one of the following correctly states the continuing education requirements to renew a Class A journeyman electrician license?
16 hours of approved continuing education with at least 12 hours on the NEC and a maximum of 4 hours on related technical topics or Minnesota Statues and Rules regulating electrical licensing and inspections.
73. Except for rigid metal conduit and intermediate metal conduit, what is the minimum required spacing for cables, raceways, and boxes installed in exposed or concealed locations in or under metal corrugated sheet roof decking?
1 ½ inches measured from the lowest surface of the roof decking to the top of the cable, raceway or box.
74. Where the major portion of the load consists of non-linear loads, why does the NEC require the neutral be considered a current carrying conductor on a four-wire, three phase, wye-connected circuit?
Because there are harmonic currents present in the neutral conductor.
75. An electric kiln rated 208 volt, 8.4 KW, single phase, is supplied by a 60 ampere rated branch circuit. The Branch circuit is extended using 6 AWG-2 Type MC cable. The conductors in the cable are copper. The total length of the branch circuit is 80 feet. Using the information provided, what is the approximate percentage voltage drop on the branch circuit? Assume K=12.8
1.5%
78. A 480-volt delta, 120-208 volt wye three phase transformer installed is installed as a separately derived system. Two parallel 250 kcmil Type XHHW aluminum conductors per phase are installed in separate flexible metal conduit raceways between the transformer and a 400 ampere disconnect.
What is the minimum size aluminum system bonding jumper?
1/0 AWG
79. Which one of the following wiring methods is permitted for branch circuits serving the patient care space in a dental clinic?
Armored Cable: Type Ac
80. Refer to Figure 15 in the Diagram booklet. The routing of two feeder circuits requires the installation of a pull box to be used for an angle pull. Conduit "A' is trade size 3 ½" and conduit "B" is trade size 4". The conductors are not spliced in the pull box. From the options listed below, what is the minimum size box that complies with the NEC requirements?
30" x 30"
81. A feeder circuit to a distribution switchboard consists of three paralleled 350 kcmil THN copper conductors per phase, installed in three separate conduits. What is the maximum, standard size circuit breaker that may be used to protect this circuit? (The breaker terminations are rated 75 degrees C.
800 amperes
82. Refer to Figure 24 in the Diagram booklet. The drawing represents the kitchen of a dwelling unit.
What is the minimum number of receptacle outlets required to serve the kitchen countertop surfaces when the dimension represented by "X" is 16 inches?
8
83. What is the minimum cover required for Type UF cable installed inside PVC conduit routed under a parking area and across the lawn to extend a single 120 volt, 20 ampere branch circuit provided with ground fault circuit interrupter (GFCI) protection for an outdoor receptacle outlet at a dwelling unit?
12 inches
84. A 1200 ampere 3 phase feeder consisting of three, 750 kcmil Type THHN aluminum conductors per phase is installed in three separate rigid polyvinyl chloride conduits. What size aluminum equipment grounding conductor is required in each conduit?
250 KCMIL
85. Which one of the following is NOT a condition or requirement for Type NM cable to enter an outlet box without being secured to the box?
Within 12 inches of the box measured along the sheath of the cable, the cable is fastened to a support.
86. What is the minimum size of a single copper grounding electrode conductor installed to a metal underground water pipe electrode at a dwelling with a 200 ampere general service supplied by 250 kcmil aluminum service entrance conductors and a 125 ampere load management service supplied by 2/0 AWG aluminum service entrance conductors? Both sets of service entrance conductors are supplied by a single set of utility supply conductors.
2 AWG
87. Arc fault circuit interrupter protection is required for which one of the following branch circuit installations?
A 125 volt, single phase, 15 ampere branch circuit supplying a smoke alarm outlet installed in a bedroom of a dwelling unit.
88. In which manner shall grounded conductors that are NOT part of a parallel circuit be terminated within a panelboard?
In an individual terminal that is also not used for another conductor.
89. In which one of the following scenarios is a person holding a Minnesota Class A journeyman electrician license able to legally perform electrical work (in compliance with the Minnesota Electrical Act)?
The electrical work is performed while an employee of an employer where both an employed Class a master electrician and the employer are currently registered with the Minnesota Department of Labor and Industry.
90. In which one of the following circuits is the grounded circuit conductor considered to be a current carrying conductor?
A 3 conductor circuit supplied from a 4 wire 3 phase wye system.
91. Which one of the following does NOT apply to any vehicle used by a contractor while performing electrical work for which a contractor's license is required?
The marking shall include any identifying design elements or logo.