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Article 250-310 Grounding and Bonding
1. The connection
(attachment) of the grounding electrode conductor to a grounding electrode must
___.
a) be accessible
b) be made in a manner that will ensure a permanent and
effective grounding path
c) a and b
d) none of these
250.68(A) and (B)
2. The grounding conductor
connection to the grounding electrode must be made by ____.
a) listed lugs
b) exothermic welding
c) listed pressure connectors
d) any of these
250.70 and 250.8
3. A metal elbow that is
installed in an underground installation of rigid nonmetallic conduit and is
isolated from possible contact by a minimum cover ____ to any part of the
elbow, is not required to be grounded.
a) of 6 in.
b) of 12 in.
c) of 18 in.
d) as specified in Table
250.80
Ex
4. Metal enclosures and
raceways for conductors added to existing installations of ____, which do not provide
an equipment ground are not required to be grounded if they are less than 25
ft. long, they are free from probable contact with the grounded conductive
material, and are guarded against contact by persons.
a)
nonmetallic-sheathed cable
b) open widing
c)
knob-and-tube wiring
d) all of
these
250.86
Ex 1
5. Bonding must be provided
where necessary to ensure ____ and the capacity to conduct safely any fault
current likely to be imposed.
a) electrical continuity
b) fiduciary responsibility
c) listing requirementts
d) electrical demand
250.90
6. Service equipment, service
raceways, and service conductor enclosures must be bonded ____.
a) to the grounded service conductor
b) by threaded raceways
into enclosures, couplings, hubs, conduit bodies, etc.
c) by listed bonding
devices with bonding jumpers
d) any of these
250.92(B)(1) through (4)
7. Service metal raceways and
metal clad cables, are considered effectively bonded
when using threadlless couplings and connectors that are _____.
a) nonmetallic
b) made up of tight
c) sealed
d) these are never allowed for bonding
250.92
(B)(3)
8. An accessible means
external to enclosures for connecting intersystem ____ conductors must be
provided at the service equipment and at the disconnecting means.
a) bonding
b) grounding
c)
secondary
d) a and b
250.94
9. When bonding enclosures,
metal raceways, frames, fittings, and other metal noncurrent-carrying parts, any
nonconductive paint, enamel, or similar coating must be removed at _____.
a) contact surfaces
b) threads
c)
secondary
d) a and b
250.96(A)
10. For circuits over 250
volts-to-ground, electrical continuity can me maintained between a box or
enclosure where no oversized, concentric, or eccentric knockouts are
encountered, and a metal conduit by ____.
a) threadless fittings for cables with metal sheath
b) double locknuts on threaded conduit (one inside and one
outside the box or enclosure)
c) fittings that have
shoulders that seat firmly against the box with a locknut on the inside or
listed fittings identified for the purpose.
d) all of
these
250.97
Ex 1, 2, 3, and 4
11. Regardless of the voltage
of the electrical system, the electrical continuity of non-current carrying
metal parts of equipment, raceways, and other enclosures in any hazardous
(classified) location as defined in Article 500 must be ensured b any of the
methods specified in 250.92(B)(2) through (B)(4). One or more of these _______
methods must be used whether or not supplementary equipment grounding
conductors are installed.
a) grounded
b) securing
c) sealing
d) bonding
250.100
12. Equipment bonding jumpers
on the supply side of the service must be no smaller than the sized shown in
____.
a)
Table 250.66
b)
Table 250.122
c)
Table 310.16
d)
Table 310.15(B)(6)
250.102(C)
13. A service is supplied by
three metal raceways. Each raceway contains 600 kcmil ungrounded (phase)
conductors. Determine the size of the service bonding jumper for each raceway.
a)
1/0 AWG
b)
2/0 AWG
c)
225 kcmil
d)
500 kcmil
250.102(C),
Table 250.66
14. What is the minimum size
copper bonding jumper for a service raceway containing 4/0 THHN aluminum conductors?
a) 6 AWG aluminum
b) 3
AWG copper
c) 4 AWG aluminum
d) 4
AWG copper
250.102
(C) Table 250.66
15. The equipment bonding
jumper can be installed on the outside of a raceway providing the length of the
run is not more than ____ and the bonding jumper is routed with the raceway.
a)
12 in.
b)
24 in.
c)
36 in.
d)
72 in.
250.102
(E)
16. The metal water-piping
system(s) must be bonded to the ____.
a) grounded conductor at the service
b) service equipment enclosure
c) equipment grounding bar or bus at any panelboard within the
building
d) a or b
250.104(A)(1)
17. A building or structure
that is supplied by a feeder must have the interior metal water-piping system
bonded with a conductor sized from ____.
a)
Table 250. 66
b) Table
250.122
c)
Table 310.16
d) none of these
250.104(A)(3)
18. Exposed structural metal
that is interconnected to form a steel building frame that is not intentionally
grounded and is likely to become energized, must be bonded to:
a) The
service equipment enclosure
b)
The grounded conductor at the service
c)
The grounding electrode where of sufficient size
d) any of these
250.104(C)
19. Lightning protection
system ground terminals ____ be bonded to the building grounding electrode
system.
a) must
b) must not
c) can
d) none of these
250.106
20. Exposed
non-current-carrying metal parts of fixed equipment likely to become energized
must be grounded where ____.
a) within 8 ft vertically or 5 ft horizontally of ground or
grounded metal objects
b) located in wet or damp locations and not isolated
c) in electrical contact with metal
d) any of these
250.110(1),
(2), and (3)
21. Electrical equipment permanently mounted on skids, and the
skids, must be grounded with an equipment bonding jumper sized as required by
____.
a)
250.50
b)
250.66
c)
250.122
d)
310.15
250.112(K)
22. An
equipment grounding conductor run
with, or enclosing, the circuit conductors must be ___ or metal raceway as
listed in 250.118.
a) a copper conductor
b) an aluminum conductor
c) a copper-clad aluminum conductor
d) any of these
250.118
23. For flexible metal
conduit (FMC) and liquidlight flexible metal conduit (LFMC), an equipment grounding
conductor is required regardless of the size of the overcurrent protection if
the FMC or LMFC is installed for the reason of ____.
a) physical protection
b) flexibility
c) protection from moisture
d) communication systems
250.118(5)(d) and (6)(e)
24. Liquidtight flexible
metal conduit (LFMC) in ¾ through 1 ¼ in. trade sizes can be used as the
equipment grounding conductor if the length in any ground return path does not
exceed 6 ft and the circuit conductors contained in the conduit are protected
by overcurrent devices rated at ____ or less when the conduit is not installed
for flexibility.
a)
15A
b)
20A
c)
30A
d)
60A
250.118(6)(c)
25. Conductors with
insulation that is ____ cannot be used for ungrounded or grounded conductors.
a) green
b) green with one or more yellow stripes
c) a or b
d) white
250.119
26. Equipment grounding
conductors for feeder taps must be sized in accordance with ____ based on the
ampere rating of the circuit protection device ahead of the feeder, but in no
case is it required to be larger than the circuit conductors.
a)
Table 250.66
b)
Table 250.94
c)
Table 250.122
d)
Table 220.19
250.122(G)
27. The equipment conductor
must not be smaller than shown in Table 250.122, but it must not be required to
be larger than the circuit conductors supplying the equipment.
a)
True
b)
False
250.122(A)
28. When a single equipment
grounding conductor is used for multiple circuits in the same raceway or cable,
the single equipment grounding conductor must be sized according to ____.
a) the combined rating of all the overcurrent protection
devices
b) the largest overcurrent protection device of the multiple
circuits
c) the combined rating of all the loads
d) any of these
250.122(C)
29. The terminal of a wiring
device for the connection of the equipment grounding conductor must be
identified by a green-colored, ____.
a) not readily removable terminal screw with a hexagonal head
b) hexagonal, not readily removable terminal nut
c) pressure wire connector
d) any of these
250.126
30. When considering whether
equipment is effectively grounded, the structural metal frame of a building is
permitted to be used as the required equipment grounding conductor for ac
equipment.
a)
True
b)
False
250.136(A)
31. Ranges and clothes dryers
for existing branch circuit installations that were installed with the frame
grounded by the grounded circuit conductor are allowed to continue this
practice if all conditions of the exception to 250.140 are met.
a)
True
b)
False
250.140 Ex
32. A grounded circuit
conductor must not be used for grounding non-current-carrying metal parts of
equipment on the load side of ____.
a) the service disconnecting means
b) the separately derived system disconnecting means
c) overcurrent protection devices for separately derived
systems not having a main disconnecting means
d) all of
these
250.142(B)
33. An ____ must be used to connect the grounding terminal of
a grounding-type receptacle to a grounded box.
a) equipment bonding jumper
b) equipment grounding jumper
c) a or b
d) a and b
250.146
34. An equipment bonding
jumper must be used to connect the grounding terminal of a grounding-type receptacle
to a grounded box. Where the box is surface-mounted, direct metal-to-metal
contact between the device yoke and the box can be permitted to ground the
receptacle to the box.
a)
True
b)
False
250.146(A)
35. Receptacle yokes designed
and _____ as self-grounding are permitted to establish the bonding path between
the device yoke and a grounded outlet box.
a) approved
b) advertised
c) listed
d) installed
250.146(B)
36. Contact devices or yokes designed and listed as self-grounding
are permitted in conjunction with the supporting screws to establish the
grounding circuit between the device yoke and flush-type boxes.
a)
True
b)
False
250.146(B)
37. Where circuit conductors
are spliced within a box, or terminated on equipment within or supported by a
box, any equipment grounding conductors associated with those circuit
conductors must be spliced or joined within the box or to the box with devices
suitable for the use.
a)
True
b)
False
250.148
38. When equipment grounding
conductor(s) are installed in a metal box, an electrical connection is required
between the equipment grounding conductor and the metal box, enclosure by means
of a ___.
a) grounding screw
b) soldered connection
c) listed grounding device
d) a or b
250.148(C) and (E)
39. The secondary circuits of
current and potential instrument transformer must be grounded where the primary
windings are connected to circuits of ____ or more to ground and, where on switchboards,
must be grounded irrespective of voltage.
a)300V
b)
600V
c)
1,000V
d)
150V
250.170
40. The grounding conductor
for secondarily circuits of instrument transformers and for instrument cases
must not be smaller than ____ AWG copper.
a)
18
b)
16
c)
14
d)
12
250.178
Article 280 Surge Arresters
41. Line and
ground-connecting conductors for a surge arrester must not be smaller than ____
AWG copper.
a)
14
b)
12
c)
10
d) 8
280.21
Article 285 Transient Voltage
Surge Suppressors (TVSSs)
42. Article 285 covers surge
arresters.
a)
True
b)
False
285.1
43. A TVSS is listed to limit
transient voltages by diverting or limiting surge current.
a)
True
b)
False
285.2
44. TVSSs must be marked with
their short-circuit current rating, and they must not
be installed where the available fault current is in excess of that rating.
a)
True
b)
False
285.6
45. A TVSS can be connected
anywhere on the premises wiring system.
a)
True
b)
False
285.21(A)
46. Unless specified
elsewhere in the Code, Chapter 3 must be used for voltages of ____.
a)
600 volts-to-ground or less
b)
300V between conductors or less
c)
600V, nominal, or less
d)
600V RMS
300.2(A)
47. All conductors of a
circuit, including the grounded and equipment grounding conductors,
must be contained within the same ____.
a) raceway
b) cable
c) trench
d) all of
these
300.3(B), see 300.5(1)
48. In both exposed and concealed
locations, where a cable or nonmetallic raceway-type wiring method is installed
through bored holes n joists, rafters, or wood members, holes must be bored so
that the edge of the holes is ____ the nearest edge of the wood member.
a) not less than 1 ¼ in from
b) immediately adjacent to
c) not less than 1/16 in from
d)
90° away from
300.4(A)(1)
49. Cables laid in wood
notches protection against nails or screws by using a steel plate at least ____ thick, installed before
the building finish is applied. A thinner plate that provides equal or better
protection may be used if listed and marked.
a)
1/16 in
b)
1/8 in
c) ½
in
d) none of these
300.4(A)(2)
50. Where NM cable passes
through factory or field opening in metal members, it must be protected by ____
bushings or ____ grommets that cover metal edges. The protection fitting must
be securely fastened in the opening prior to the installation of the cable.
a) approved
b) identified
c) listed
d) none of these
300.4(B)(1)
51. Wiring methods installed
behind panels that allow access, such as the space above a dropped ceiling, are
required to be ____ according to their applicable Articles.
a) supported
b) painted
c) in a metal raceway
d) all of
these
300.4(C)
52. When unable to maintain
the minimum required distance from the edge of a wood framing member when
installing a cable or nonmetallic raceway parallel to framing member, the cable
or raceway must be protected from penetration by screws or nails by a steel
plate or bushing at least ____ and of appropriate length and width to cover the
area of the wiring. A thinner plate that provides equal or better protection
may be used if listed and marked.
a) ¼
in thick
b)
1/8 in thick
c)
1/16
d)
24 gauge
300.4(D)
53. Where underground
conductors and cables emerge from underground, they must be protected by
enclosures or raceways to a point _____ above finished grade. In no case can
the protection be required to exceed 18 in. below grade.
a) 3
ft.
b) 6
ft.
c) 8
ft.
d)
10 ft.
300.5(D)(1)
54. What is the minimum cover
requirement in inches for direct burial UF cable installed outdoors that
supplies power to a 120V, 30A circuit?
a) 6
in.
b)
12 in.
c)
18 in.
d)
24 in.
Table 300.5 Column 1
55. When installing raceways,
underground in rigid nonmetallic conduit and other approved raceways, there
must be a minimum of _____ of cover.
a)6 in.
b)
12 in.
c)
18 in.
d)
24 in.
Table 300.5, Column 3
56. UF cable used with a 24V
landscape lighting system is permitted to have a minimum cover of ____.
a) 6
in.
b)
12 in.
c)
18 in.
d)
24 in.
Table 300.5, Column 5
57. Direct-buried conductors
or cables can be splices or tapped without the use of splice boxes when the
splice or tap is made in accordance with 110.14(B).
a)
True
b)
False
300.5(E)
58. Conduits or raceways
through which moisture may contact live parts must be ____ at either or both
ends.
a) sealed
b) plugged
c) bushed
d) a or b
300.5(G)
59. All conductors of the
same circuit are required to be ____.
a) in the same raceway or cable
b) in close proximity in the same trench
c) in the same size
d) a or b
300.5(I), see 300.3(B)
60. Cables or raceways
installed using directional boring equipment must be ____ for this purpose.
a) marked
b) listed
c) labeled
d) approved
300.5(K)
61. Which of the following
metal parts must be protected from corrosion both inside and out?
a)
Ferrous metal raceways
b)
Metal elbows
c)
Boxes
d) all of
these
300.6(A)
62. Metal raceways, boxes,
fittings, supports, and support hardware can be installed in concrete or in
direct contact with the earth or other areas subject to sever corrosive
influences, where ____ approved for the conditions, or where provided with
corrosion protection approved for the purpose.
a) the soil is
b) made of material
c) the qualified installer is
d) none of these
300.6(A)(3)
63. Nonmetallic raceways,
cable trays, cablebus, auxiliary gutters, boxes, cables with a nonmetallic
outer jacket and internal metal armor or jacket, cable sheathing, cabinets,
elbows, couplings, nipples, fittings, supports and support hardware must be made
of material ____.
a) listed for the condition
b) approved for the condition
c) both a and b
d) either a or b
300.6(C)
64. Nonmetallic raceways,
cable trays, cablebus, auxiliary gutters, boxes, and cables with a nonmetallic
outer jacket must be made of material approved for the condition and where
exposed to chemicals, the materials or coatings must be ___.
a) listed as inherently resistant to chemicals
b) identified for the specific chemical reagent
c) both a and b
d) either a or b
300.6(C)(2)
65. In general, areas where
____ are handled and stored may present severe corrosive
conditions, particularly when wet or damp.
a) laboratory chemicals and acids
b) acids and alkali chemicals
c) acids and water
d) chemicals and water
300.6(D) FPN
66. Raceways must be provided
with expansion fittings where necessary to compensate for thermal expansion and
contraction.
a)
True
b)
False
300.7(B)
67. Metal raceways, cable
armor, and other metal enclosures for conductors must be ____ joined together
to form a continuous electrical conductor.
a) electrically
b) permanently
c) metallically
d) none of these
300.10
68. Where independent support
wires of a ceiling assembly are used to support raceways, able assemblies, r
boxes above a ceiling, they must be secured at both ends. Cables and raceways
must ____.
a) be identified for this purpose
b) not be supported by ceiling grids
c) not contain conductors larger than 14 AWG
d) be identified by paint them orange
300.11(A)
69. The independent support
wires for wiring in a fire-rated ceiling assembly must be distinguishable from
fire-rated suspended ceiling framing support wires by ____.
a) color
b) tagging
c) other effective means
d) any of these
300.11(A)(1)
70. Raceways are allowed to
be used as a means of support when the raceway contains electrical power supply
conductors for electrically controlled equipment and the raceway is used to
support Class 2 circuit conductors or cables that connect to eh same equipment.
a)
True
b)
False
300.11(B)(2)
71. Metal or nonmetallic
raceways, cable armors, and cable sheaths ___ between cabinets, boxes, fittings
or other enclosures or outlets.
a) can be attached with electrical tape
b) are allowed gaps for expansion
c) must be continuous
d) none of these
300.12
72. In multiwire circuits,
the continuity of the ____ conductor must not be dependent upon the device
connections.
a) undergrounded
b) grounded
c) grounding
d) a and b
300.13(B)
73. When the opening to an
outlet, junction, or switch pint is less than 8 in. in any dimension, each conductor
must be long enough to extend at least ____ outside the opening of the
enclosure.
a) 0
in.
b) 3
in.
c) 6
in
d)
12 in
300.14
74. A box or conduit body is
not required where cables enter or exit from conduit or tube that is used to
provide cable support or protection against physical damage. A fitting must be
provided on the end(s) of the conduit or tubing to ____.
a) allow for the future
connection of a box
b) be used for a future pull point
c) protect the cable from abrasion
d) allow the coupling of another section of conduit
300.15(C)
75. Splices and taps are
permitted in cabinets or cutout boxes if the conductors, splices, and taps do
not fill the wiring space at any cross-section to more than ____ percent.
a)
20
b)
40
c)
60
d)
75
300.15(1) and 312.8
76. A bushing is permitted in
lieu of a box or terminal where conductors emerge from a raceway and enter or
terminate at equipment, such as open switch boards, unenclosed control
equipment, or similar equipment.
a)
True
b)
False
300.16(B)
77. The number of conductors
permitted in a raceway must be limited to ____.
a) permit heat to dissipate
b) prevent damage to insulation during installation
c) prevent damage to insulation during removal of conductors
d) all of
these
300.17
78. Pre-wired raceway
assemblies are permitted only where specifically permitted in the Code for the applicable wiring method.
a)
True
b)
False
300.18(A)
79. Metal raceways must not
be ____ by welding to the raceway unless specifically designed to be, or
otherwise specifically permitted to be, by the Code.
a) supported
b) terminated
c) connected
d) all of
these
300.18(B)
80. A vertical run of 4/01
AWG copper must be supported at intervals not exceeding _____.
a)
80 ft.
b)
100 ft.
c)
120 ft.
d)
40 ft.
Table 300.19(A)
81. _____ is a nonferrous,
nonmagnetic metal that has no heating due to inductive hysteresis heating.
a)
Steel
b)
Iron
c)
Aluminum
d) all of
these
300.20(B) FPN
82. Openings around
electrical penetrations through fire-resistant-rated walls, partitions, floors,
or ceilings must ____ to maintain the fire resistance rating.
a) be documented
b) not be allowed
c) be firestopped using approved methods
d) be enlarged
300.21
83. Equipment and devices are
permitted within ducts or plenum chambers used to transport environmental air only
if necessary for their direct action upon, or sensing of, the ____.
a) contained air
b) air quality
c) air temperature
d) none of these
300.22(B)
84. One wiring method that is
permitted in ducts or plenums used for environmental air is ____.
a) flexible metal conduit of any length
b) electrical metallic tubing
c) armored cable (Type AC)
d)
nonmetallic-sheathed
cable
300.22(B)
85. The space above a hung
ceiling used for environmental air handling purposes is an example of ______
and the wiring limitations of _______apply.
a) a plenum, 300.22(B)
b) other spaces, 300.22(C)
c) a duct, 300.22 (B)
d) none of these
300.22(C) FPN
86. Electric wiring in the
air-handling area beneath raised floors for data-processing systems is
permitted in accordance with Article 645.
a)
True
b)
False
300.22(D)
Article 310 Conductors for
General Wiring
87. Conductors must be
insulated except where specifically allowed by the NEC to be bare, such as for equipment grounding or bonding
purposes.
a)
True
b)
False
310.2(A) Ex
88. In general, the minimum
size phase, neutral, or grounded conductor permitted for use in parallel
installations is ________ AWG.
a)
10
b) 1
c)
1/0
d) 4
310.4
89. When conductors are run
in parallel, the currents should be evenly divided between the individual
parallel conductors so that each conductor is evenly heated. This is
accomplished by ensuring that each of the conductors within a parallel set has
the same ____ and all conductors terminate in the same number.
a) length
b) material
c) cross-sectional area
d) none of these
310.4
90. It is not the intent of
310.4 to require that conductors of one phase, neutral, or grounded circuit
conductor be the same as those of another phase, neutral, or grounded circuit
conductor to achieve _____.
a) polarity
b) balance
c) grounding
d) none of these
310.4
91. The minimum size
conductor permitted n any building for branch circuits under 600V is ____ AWG.
a)
14
b)
12
c)
10
d) 8
Table 310.5
92. Insulated conductors used in wet locations must be ____.
a)
moisture-impervious metal-sheathed
b)
RHW, TW, THHW, THWN, XHHW
c) listed for wet locations
d) any of these
310.8(C)
93. Where conductors of
different insulation are associated together, the limiting temperature of any
conductor must not be exceeded.
a)
True
b)
False
310.10
94. There are four principal
determinants of conductor operating temperature, one of which is ____ generated
internally in the conductor as the result of load current flow.
a) friction
b) magnetism
c) heat
d) none of these
310.10 FPN No. 1 (2)
95. Letters used to designate
the number of conductors within a cable are ____.
a)
D- Two insulated conductors laid parallel
b)
M- Two or more insulated conductor twisted spirally
c)
T- Two or more insulated conductors twisted parallel
d) a and b
310.11(C)
96. TFE-insulated conductors
are manufactured in sizes from 14 through ____ AWG.
a) 2
b) 1
c)
2/0
d)
4/0
Table 310.13
97. Lettering on conductor
insulation indicates its intended condition of use. THWN is rated ____.
a)
75°C
b) for wet locations
c) a and b
d) not enough information
Table 310.13
98. The ampacities listed in
the Tables of Article 310 are based on temperature alone and do not take ____
into consideration.
a) continuous loads
b) voltage drop
c) insulation
d) wet locations
310.15(A)(1)
FPN No.1
99. Where six
current-carrying conductors are run in the same conduit or cable, the ampacity
of each conductor must be adjusted to a factor of ____ percent of its value.
a)
90
b)
60
c)
40
d)
80
Table 310.15(B)(2)(a)
100. Conductor derating factors
do not apply to conductors in nipples having a length not exceeding ______.
a)
12 in.
b)
24 in.
c)
36 in.
d)
48 in.
310.15(B)(2)(a)
Ex 3
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Course Title and Name 05
Nec Quiz
102 Course ID# 8542
List the name of each credential held by attendee
Credited____3hrs________
Email address Fax#
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To be completed by Gary Klinka www.garyklinka.com My credential link #70172
Attendee passed the course with a greater than 70% score on date