2nd year 1st semester
Refer to Figure 210.6, shown above. The conductors connected to the terminal lugs are 4/0 AWG. The minimum wire bending space required at II is ___ inches. These lugs are of the lay-in type.
6 (strait in the box
PVC shall not be permitted where subject to ambient temperature in excess of ___ degrees Fahrenheit unless listed otherwise.
122
Transient voltage surge suppressors are used to minimize the damage to connected equipment caused by ___.
line surges and spikes
Service conductors supplying one building shall not ___ of another building.
pass through the interior
The authority having jurisdiction has the responsibility ___.
all of these
Which of the following could be used in a concrete slab?
all of these
What minimum size schedule 80 PVC conduit is required for a 65' run? The conduit will contain three 350 kcmil, one 3/0, and one #2 THHN/THWN conductors.
3
Refer to Figure 208.51. The minimum CALCULATED dimension for "height" is ___ inches. All conductors enter the right size of the pull box and exit the bottom.Conduit G = 2" Conduit H = 21/2" Conduit J = 11/2"Conduit K = 1" Conduit L = 11/2" Conduit M = 2" Conduit N = 2"
181/2
What is the minimum number of 20-ampere branch circuits for small appliances required in a residence?
2
Select the size of the aluminum equipment grounding conductor required for a circuit protected by a 70-ampere fuse.
6 AWG
A feeder supplying a 5 kW wall-mounted oven and a 7 kW counter-mounted cooktop in a residence shall have a minimum demand factor of ___.
7.8 kW
Which of the following is not a standard circuit breaker size? Select one: a.75 b.110 c.50 d.25
75
When installed in raceways, conductors ___ AWG and larger shall be stranded.
8
If the equipment terminals are listed for 75°C, what size THHN conductors are required for a 50 ampere circuit?
8 AWG
Where installed in a 3-pole, 600-volt fused safety switch, the minimum number of fuses required to protect a 120-volt, 1-ph, 2-wire branch circuit is ___.
1
A unit load of ___ volt-amperes per square foot shall be used when calculating the lighting load of a restaurant.
1.5
XHHW 500 kcmil conductors have an insulation that is ___ mm thick.
1.65 315.10c
The smallest trade size EMT available that can be installed between two big pull boxes is ___.
1/2
Non combustible surfaces that are broken or incomplete shall be repaired so there will be no gaps or open spaces greater than ___ inch at the edge of the fitting or box.
1/8
The largest conductor permitted in 3/8" flexible conduit is ___ AWG.
10
Figure 208.33 The smallest (volume) junction box that can be used in the installation, shown above in Figure 208.33, is a ___. Conduits #1 and #4 each contain twenty-four 10 AWG wires. Conduits #2 and #5 each contain twelve 6 AWG wires. Conduits #3 and #6 each contain sixteen 8 AWG wires. All conductors are "wire nutted" inside the box. Additionally, each conduit contains a ground that is equal in size to the circuit conductors.
10" x 10" x 4" deep
For a one-family dwelling, the service disconnecting means shall have a rating of not less than ___ amperes, 3-wire.
100
The minimum feeder-circuit conductor size, before the application of any adjustment or correction factors, shall have an allowable ampacity equal to or greater than the noncontinuous load plus ___ percent of the continuous load.
125
The smallest permissible wire size for branch circuit conductors supplying other than cooking appliances is ___ AWG according to the NEC®.
14
What is the circular mil area of a 3/0 AWG conductor?
167,800
RMC is the wiring method used for the illustration shown below. The conduits are threaded wrenchtight into the entries in the bottom of the "bell" box. No additional support is required for this installation (the earth can support the conduits) if the conduit length from the finish surface (dirt here) to the box is ___ inches or less.
18
Underground service conductors that are not encased in concrete and that are buried ___ or more below grade shall have their location identified by a warning ribbon that is placed at least 12 inches above the underground installation.
18 inches
Where it is impracticable to locate the service head above the point of attachment, the service head location shall be permitted no further than ___ from the point of attachment.
2'
What is the cubic-inch allowance for a 10 AWG conductor?
2.50 (314.16)
Figure 208.55Drawingis N.T.S.All conductors are4 AWG or larger.All conductors enter the right side of the box and exit the left side of the box. The minimum CALCULATED dimension for "width" shown in Figure 208.55 is ___ inches.ConduitG= 2" ConduitH= 21/2" ConduitJ= 11/2" ConduitK= 2"ConduitL= 1" ConduitM= 11/2" ConduitN= 2"
20
Arc-fault requirements for dwelling units are found in Section ___.
210.12
Figure 207.14 Refer to Figure 207.14. The wiring method is Type USE cable. The minimum distance permitted at Point B is ___ inches. Select one:
24 (BURRY TABBLE CHAPTER 300
A duplex receptacle with two circuits on the same yoke is permitted to have ___ as a means of disconnect. I. two single-pole circuit breakers without tie handles II. one double-pole circuit breaker III. two single-pole circuit breakers with tie handles
2or 3
Figure 201.15 Refer to Figure 201.15. The minimum working clearance at Point Z is ___ feet. The panel is 120/208-volt, 3Ø, 4W.
3
For purposes of calculating a residential service, the general-purpose lighting load is calculated at ___ per square foot of area.
3 volt-amperes
When installing more than two conductors in a 50 foot run of 3 inch intermediate metal conduit, the maximum area that can be filled with conductors is ___ square inches.
3.169
According to 240.4(D)(7), the largest circuit breaker that can be used to protect a circuit that uses 10 AWG conductors has a rating of ___ A.
30
Figure 201.18 For the 120/208-volt panelboard shown in Figure 201.18, the minimum width of the working space directly in front of the panelboard is ___.
34 inches
Refer to Figure 210.6, shown above. The conductors connected to the terminal lugs are 4/0 AWG. The minimum wire bending space required at I is ___ inches. These lugs are NOT removable.
4
The cross-sectional area of a 4 AWG BARE copper conductor is ___ cmils.
41740
The minimum demand for an electric clothes dryer in a residential load calculation is ___ watts.
5,000
Fastened-in-place utilization equipment that is connected to a branch circuit with other loads shall not exceed ___ percent of the branch circuit rating.
50
A section of 8" x 8" wireway is shown in Figure 208.61. The maximum number of 2/0 AWG THHN/THWN conductors that can be installed in the wireway is ___.
57
In a single-family dwelling the receptacles shall be installed so that no point measured along the floorline is more than ___ ft. to the nearest outlet.
6
Lengths of flexible metal conduit longer than ___ feet are not acceptable as an equipment grounding conductor. In such cases a separate bonding jumper is required to be run outside of the flexible conduit to maintain the continuity of the grounding path.
6
Circuit breakers and switches containing fuses shall be readily accessible and installed so that the center of the grip of the operating handle of the switch or circuit breaker, when in its highest position, is not more than ___ above the floor or working platform.
6 feet, 7 inches
Where multiple rod, pipe, or plate electrodes are installed, they shall not be less than ___ apart.
6'
The ampacity of types NM and NMC cable shall be that of ___ degree C conductors.
60 [334.80]
A nipple contains four 6 AWG THW copper current-carrying conductors. The ampacity of each conductor would be ___ amperes.
65
What is the MINIMUM bend radius for 1 in. diameter corrugated sheath MC cable?
7 in [330.42a2]
Figure 108.014 Range and Ref are located less than 6 ft.from the outside edge of the kitchen sink.Refer to Figure 108.014. Where this kitchen is in a house, which receptacles are required to be GFCI protected?
All the receptacles (all in a kitchen/food preperation area)
The grounded conductor of a branch circuit that is 6 AWG or smaller shall be ___.I. without splices II. white or gray in color
Both 1 and 2
Which chapters in the Code apply generally?
Chapters 1-4
Refer to Figure 208.35, shown above. Which industrial cover/box combination will violate the NEC®? All the conductors are 12 AWG. I. 4 x 11/2 square with 5.0 in3 industrial cover II. 411/16 x 11/4 square box with a 4.2 in3 industrial coverIII. 4 x 21/8 square box with a 3.6 in3 industrial cover
I only
Which of the drawings, shown above in Figure 207.12, FAILS to satisfy the NEC® requirements for conductor length in boxes?
II & III only (at least 3 inches of wire going outside of the box)
The switch or breaker supplies a 120/240 V, 3-wire load. Which of the illustrations shown in Figure 210.1 would satisfy the Code requirements of 240.22(1)?
II only (all wire must disconnect at the same time including neutral HANDLE TIES DO NOT COUNT MUST BE PERM)
You need to get power to a 208-volt load. Your available power is from a 120/240-volt, 3Ø, 4-wire panelboard. Is it permitted for you to run a branch circuit from the neutral bar and a 1-pole circuit breaker installed in breaker space #4? The CB has a 120-volt rating.
No/yes?
Although a residential basement is unfinished, the homeowner wants several receptacles to be installed. These receptacles are required to be ___. Select one: a.GFCI protected b.connected to the same circuit c.AFCI protected d.all of these
all of these
Where installed in a metal raceway, all feeder conductors sharing a common neutral conductor shall be ___.
enclosed within the same raceway
A(n) ___ shall be used to connect the grounding terminal of a grounding type receptacle to a grounded box.
equipment bonding jumper
Informational Notes (I-Notes) in the National Electrical Code® are ___.
explanatory information (not mandatory)
The neutral conductor of a 120-volt circuit is referred to as the ___ conductor in the NEC®.
grounded
In NEC® 210.52(A)(1) , the "6-foot rule" for spacing receptacles applies to all the following areas of a house, except for ___. Select one: a.master bedrooms b.recreation rooms c.hallways d.dining rooms
hallways
Along a kitchen countertop in a restaurant, the maximum spacing between receptacles is ___.
not specified
On a 4-wire, delta-connected system where the midpoint of one phase winding is grounded, only the conductor or busbar having the higher phase voltage to ground shall be durably and permanently marked by an outer finish that is ___ in color.
orange
Where two internal cable clamps are present in a box, a ___ conductor volume allowance will be counted towards the box fill calculation, based on the largest conductor in the box.
single
The definition of a branch circuit is ___.
the circuit conductors between the final overcurrent device protecting the circuit and the outlet(s)
Which of the following may not be used in damp or wet locations?
type AC armored cable
