Download Printable Version of Questions for Evaluation Test

Printable Version of Questions for Evaluation Test
1. When are you required to use an approved electrically conductive corrosion resistance
compound on conduit threads?
2. Carnival and circus overhead wiring outside of tents and concession areas where the
voltage-to-ground does not exceed 150V shall maintain a vertical clearance of
____________ above platforms, projections or surfaces from which they might be
reached.
3. Class III locations are those that are hazardous because of the presence of
_______________.
4. What is the feeder or service demand load for two 3 kW ranges?
5. If the transfer switch for a portable generator switches the ___________________
conductor, then the portable generator shall be grounded in accordance with NEC Article
250.30.
6. Service conductors shall be considered outside when run under the building if installed
in conduit and buried ______________ under earth.
7. Under a raised floor in an Information Technology Equipment room, liquidtight
flexible non-metallic conduit shall be permitted to enclose branch-circuit conductors for
information technology communication equipment. True or False
8. A feeder for a motor circuit shall have a protective device with a rating or setting
________________ the largest rating of the branch-circuit short-circuit and ground-fault
protective device for any motor in the group, plus the sum of the full load currents of the
other motors of the group.
9. The purpose of 60/120V power systems is to reduce objectionable noise in areas
containing sensitive electronic equipment. Its use is restricted to ________________
occupancies that are under close supervision by qualified personnel.
10. What is the feeder or service demand load for a kitchen/service area equipped with a
waste disposal (940VA), dishwasher (1,250VA), water heater (4,500VA) and a trash
compactor (1,100VA)?
11. The outer metal sheath of interlocked MC cable is not listed as an acceptable
grounding return path; however, if the interlocked MC cable contains an insulated 12
AWG or larger equipment grounding conductor, it can be used to supply branch circuits
in patient care areas of health care facilities. True or False
12. A branch circuit voltage that exceeds 277 volts to ground and does not exceed 600V
between conductors is used to wire the auxiliary equipment of electrical discharge lamps
mounted on poles. The minimum height of these luminaries shall not be less than
__________.
13. When sizing a pull box in a straight run which contains conductors 4 AWG or larger,
the length of the pull box shall not be less than ____________times the diameter of the
largest raceway for systems not over 600 volts nominal.
14. A 480V, three-phase service is fed by an overhead service drop. The service drop
crosses the alleyway behind the building. What is the minimum clearance that must be
maintained between the service drop and the alleyway ground?
15. Water heaters having a capacity of ___________ gallons or less shall have a branchcircuit rating not less than 125% of the nameplate rating of the water heater.
16. A single device consisting of multiple receptacles comprised of _____________ or
more receptacles shall be computed at not less than 90 VA per receptacle.
17. Energized parts of service equipment shall be _______________________ so that
they will not be exposed to accidental contact or they shall be guarded.
18. Round boxes shall not be used with any wiring connector when a locknut or bushing
is connected to the side of the box. True or False
19. Dwelling unit or mobile home feeder conductors not over 400A can be sized
according to 310.15(B)(6). True or False
20. The additional service disconnecting means for a fire pump must be installed in the
same location and grouped together with the main service disconnect.
21. Motors shall be located so that adequate ____________ is provided and so that
maintenance, such as lubrication of bearings and replacing of brushes, can be readily
accomplished.
22. The minimum point of attachment of the service-drop conductors to a building shall
in no case be less than _________________.
23. No overcurrent device shall be inserted in a(n) _________________ conductor except
a circuit breaker that simultaneously opens all conductors of the circuit in service
equipment.
24. The ampacity of branch-circuit conductors and the rating or setting of overcurrent
protective devices supplying fixed electric heating equipment for pipelines and vessels
shall not be less than __________________ percent of the total load of the heaters.
25. Wherever NM cable passes through factory or field openings in metal members, it
must be protected by ________________________ bushings or grommets that cover the
metal edges.
26. Fixture wires 18 AWG TFFN are rated for ________________.
27. The requirement for maintaining a three-foot vertical clearance from the edge of the
roof shall not apply to the final conductor span where the conductors are attached to
________________.
28. Ground fault protection is required for solidly grounded wye electrical services for
more than ___________ volts to ground but not exceeding ___________ volts phase-tophase for each disconnect rated 1000 amperes or more.
29. An electrician determining the box fill for a two-gang plastic nail on box that is 2 1/8"
deep will use the cubic inch volume of a four square deep box for the purposes of box fill
determination.
30. IGS cable is a factory assembly of one or more conductors, each individually
insulated and enclosed in a loose-fit, nonmetallic flexible conduit as an integrated gas
spacer cable rated ____________________ volts.
31. The 125V, battery back-up smoke detector circuit for the bedroom of a single family
dwelling shall be protected by an AFCI. True or False
32. Transformers of more than ______________ rating shall be installed in a transformer
room of fire-resistant construction.
33. Plaster, drywall, or plasterboard surfaces that are broken or incomplete shall be
repaired so there will be no gaps or open spaces greater than ___________ mm at the
edge of a box or fitting.
34. ______________ is a type of multi-conductor cable permitted for use as an
underground service-entrance cable.
35. What is the minimum demand load for five 5 kW cook tops, two 4 kW ovens and four
7 kW ranges?
36. Fixed electric space-heating equipment requiring supply conductors with an
insulation rated over ________ shall be clearly and permanently marked.
37. On fixed stage equipment, portable or strip luminaries and connector strips shall be
wired with conductors having an insulation rating suitable for the temperature but not less
than __________________.
38. What is the demand on the feeder neutral of an apartment complex of ten, 5 kW
household dryers? The apartment complex has a 240 V, single-phase service.
39. A fuel cell system shall be evaluated and __________________ for its intended
application prior to installation.
40. A hermetic motor-compressor controller shall have both a continuous-duty full load
current and a _______________ current rating not less than the respective rating(s) on
the compressor.
41. Can type MC cable be used to feed a luminaire rated over 600 Volts that is installed
in a highway tunnel?
42. The minimum sized service-drop conductor permitted by the Code is
________________ AWG copper or ______________ AWG aluminum or copper clad
aluminum.
43. The outer sheath of MI cable is made of _________________.
44. Service conductors that are not encased in concrete and buried 18" or more below
grade shall have their location identified by a warning ribbon placed in the trench at least
________________ above the underground installation.
45. THHN circuit conductors that operate at 277V may not occupy the same enclosure or
raceway containing conductors that operate at 48V dc that have a 300V insulation rating.
True or False
46. The patient care area is any portion of a health care facility, including the business
offices, corridors, lounges, day rooms, dining rooms or similar areas. True or False
47. A luminaire may be wall-mounted on a standard box providing it is no larger than 16"
in diameter. True or False
48. An intentionally constructed, permanent, low-impedance electrically conductive path
designed and intended to carry current under-fault conditions from the point of a ground
fault on a wiring system to the electrical supply source is a definition of:
49. What is the maximum time period that decorative lighting used for Halloween may be
installed and used?
50. In non-residential use, what is the maximum overcurrent protection for 2 AWG RHW
aluminum conductors with an ambient temperature of 88 degrees F?
51. The minimum clearance from storage space to the outside edge of a recessed,
uncovered, fluorescent fixture in a closet is _______________________.
52. Motors with 50- and 60-Hz ratings shall be marked with a ___________________
designating the locked rotor kilovolt-ampere per horsepower on 60 Hz.
53. When installing multi-conductor cables in EMT, the fill capacity shall not exceed the
allowable percentage of fill specified in ____________.
54. In general, the neutral of a solidly grounded neutral system shall be permitted to be
grounded at more than one point. True or False
55. What is the total cooking equipment demand on the main service entrance for a
single-family dwelling that is equipped with a single 2.1kW cooktop and one 4.9kW
wall-mounted oven and one 4.8kW wall-mounted oven?
56. A single family dwelling must have at least ________________ 20 ampere branch
circuits.
57. An unattended self-service gasoline station is required to have two emergency
disconnects, what is the maximum distance from the dispenser that one of the disconnects
may be located.
58. What is the recommended sized overload for a 10hp, single-phase AC motor
operating on a 208V circuit? The nameplate rating of the motor is 51.6 amps. The motor
has a marked service factor of 1.15.
59. What is the net computed load for a dwelling unit that is 200 square meters and has
one kitchen?
60. Which of the following functions shall not be connected to the life safety branch
circuits in a hospital:
61. A molded case switch rated in amperes shall be permitted as a controller for all
motors, including design _______.
62. What is the total cooking equipment demand on the main service entrance for an
apartment complex that has 55 units? Each apartment is equipped with a 3.1kW cooktop
and two 3.55kW wall mounted ovens.
63. Exposed vertical risers from fixed equipment in other than dwelling units shall be
permitted to be supported at intervals not exceeding _______ meters, if the conduit is
made up of threaded couplings, the conduit is firmly supported at the top and bottom of
the riser, an no other means of intermediate support is readily available.
64. The radius of a bend made in liquidtight flexible metal conduit shall be measured to
the ______________ conduit.
65. In general, when installing a motor in one location and the motor controller in another
location that are not within sight of each other, the minimum number of disconnecting
means means required is _____________.
66. A ballast in a fluorescent exit luminaire fixture ___________ be required to be
thermally protected.
67. A snap switch is located within reach of earth ground and is not grounded with an
equipment-grounding conductor and no means of grounding exists within the snap switch
enclosure. In this situation, the snap switch must be equipped with a
__________________.
68. What is the minimum size type SO cord required to feed a 40 hp, 460 volt, threephase, AC, wound rotor motor in an ambient temperature of 86 degrees F?
69. Heavy duty lighting track is lighting track identified for use exceeding ____________
amperes.
70. What is the minimum cooking equipment demand on the service entrance for a range
that is rated at 16.9 kW?
71. A power panelboard is one having __________ percent or fewer of its overcurrent
devices protecting lighting and appliance branch circuits.
72. A panelboard equipped with a snap switches rated 20 amperes, 30 amperes and 40
amperes has an overcurrent protection in the form of a 250 ampere main breaker. Is this
installation legal?
73. What is the minimum required size copper equipment grounding conductor for a 15
ampere branch circuit installed in rigid metal conduit that supplies a swimming pool
motor?
74. At least one entrance not less than 24 inches wide and 6.5 feet high shall be provided
to give access to the working space about the electric equipment. Where the entrance has
personnel doors, the doors shall:
75. What is the minimum size common grounding electrode copper conductor needed to
run through a building to four , 480V to 208/120V, three-phase transformers? Each
transformer has a 3/0 AWG copper secondary phase conductor.
76. What is the maximum-sized over-current device which can be used to protect the
feeders for a circuit that supplies three 50 ampere at 30 duty cycle arc welders and four
variable-duty, automatically fed, 100 ampere resistance welders? All of the welders are
rated at 75 degrees C, and THHN conductors will be used.
77. 12 AWG, THHN conductors installed in EMT which passes over a ceiling that is
heated with electric space heating cable and having a clearance of 3 inches shall have
their ampacity reduced to _____________.
78. The emergency controls for attended self-service stations shall be located no more
than ___________ from the gasoline dispensers.
79. The purpose of the equipotential plane is to prevent a difference in voltage within the
plane in an agricultural building area. True or False
80. It permissible to supply a mobile home that is factory-equipped with gas or oil-fired
central heating equipment and cooking appliances with a listed mobile home powersupply cord rated ________.
81. The ampacity requirements for a disconnecting means for x-ray equipment shall be
based on the greater of _______ percent of the input required for the momentary rating or
100 percent of the input required for the long-time rating.
82. A center pivot irrigation machine may have hand-portable motors. True or False
83. What is the minimum size copper equipment grounding conductor required for a 400
ampere branch circuit? The ungrounded conductors are sized using an adjusted value
from the 90 C column of T310.16. The ungrounded conductors were then up-sized from
500 kcmil to 750 kcmil.
84. The voltage at the line terminals of a fire-pump motor controller (controller rated
voltage) shall not drop more than _____________ percent below normal (controller-rated
voltage) under motor-starting conditions.
85. What is the maximum-sized separate overload device that can be used to protect a
480V, 20 hp, three-phase induction motor? The motor has a nameplate full-load current
of 22.8A and a marked service factor of 1.12. Assume the motor will experience no
problems with start-up after the overloads are installed.
86. In general, an equipment bonding jumper installed on the outside of a raceway may
not exceed:
87. The grounding conductor for a coaxial cable protector shall be:
88. When a portable generator is used for a portable optional standby source and is not
considered a separately derived system, what shall the equipment-grounding conductor
be bonded to?
89. Service entrance conductors shall be considered outside the building if they are
installed in conduit and covered with at least _______ mm of earth.
90. Automatically operated doors used for building egress in a hospital shall be supplied
from the ___________________.
91. What is the minimum size equipment ground for a 5 hp, 3 phase 208 V motor with 20
ampere overload protection and 30 ampere duel element time delay fuse short circuit
protection?
92. How many grounded conductors may terminate in the same lug in a panelboard if the
grounded conductors are not a part of a parallel run.
93. What is the ampacity rating of each copper conductor when installing five 10/2 with
ground MC cables bundled together for a length of four feet? The equipment in the
circuit is rated at 90 degrees Centigrade.
94. What is the maximum size overcurrent device required to protect 14 AWG
conductors used for a pump motor circuit that is protected by the motor branch-circuit
protection? The circuit extends beyond the enclosure.
95. What is the maximum size solid ungrounded conductor that may be installed in a
raceway?
96. A three-phase 480V to 208/120V transformer is configured delta-wye. The secondary
line current on the transformer is 178.6 amperes. What is the secondary phase current?
97. A three-phase 480V to 208/120V transformer is configured delta-wye. The secondary
line current on the transformer is 56.9 amperes. What is the primary line current?
98. A circuit that has a total resistance of 57 ohms and a current of 9 amps will produce a
power of __________________ watts.
99. What is the line to line voltage drop on 480 volt three-phase ac system? The circuit
conductors are 3/0 copper and are installed underground in schedule 80 rigid nonmetallic
conduit. The circuit length is 116 meters one direction. The circuit has a full load current
of 116.9 amperes.
100. A resistance reading is taken between two 18 AWG solid copper conductors. A fault
exists between the two wires somewhere in a 200 foot conduit run. The reading is 1.2276
ohms. Approximately how far down the conduit is the fault located?
© 2001 Ted “Smitty” Smith