IEC 2nd Yr, 1st semester Final (210-216)
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
Refer to figure 201.15. The minimum working clearance at Point Z is ___ feet. The panel is 120/208-volt 3ø, 4W
3
Service equipment shall have an ampere interrupting rating (AIR) ___ the fault current available at the service location.
greater than or equal to
Unless specifically listed for them, a surge-protected device is not permitted on a(n) ____ system.
impedance-grounded
Service conductors supplying one building shall not ___ of another building.
pass through the interior
The Code applies to the installation of electrical conductors, equipment and raceways in which of the following?
recreational vehicles
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
Refer to Figure 207.17, shown above. The NEC cover requirements for the underground conduit in Area B are taken from the row in Table 300.5 entitled ____
In or under airport runways, including adjacent areas where trespassing prohibited
What is an acceptable color for the grounded conductor?
White
When NM cable is run on the surface of ___ facing the attic, the cables require protection from physical damage by using substantial guard strips.
any of these
The overall diameter of a 1/0 bare stranded copper conductor is ___ inches.
.372
The minimum trade size EMT required is ___. This is a run that is 45' long. The following conductors will be installed: four -#12 THHN/THWN + three-#THHN/THWN + two-#6 THHN/THWN.
1
What is the minimum number of 120-volt receptacles required in a dwelling laundry room.
1
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
Refer to partial circuit plan shown in Figure 115.103. You are required to size the box that will contain split-wired receptacle. If the cables entering this box were all #12 MC cables, what is the smallest 4" square metal box that could be used here? The box will have a 1" -rise plaster ring installed that adds a volume of 6.1in^3 to the total volume. The MC cables will be connected to the box using external connectors. There are no cable clamps within this box. HINT: don't forget to count the wires for the device and the ground(s) that are i the MC cable.
1.5
XHHW 500 kcmil conductors have an insulation that is ___ mm thick.
1.65
Except by special permission, no conductor larger than ___ shall be installed in cellular metal floor raceways.
1/0 AWG
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
An overhead feeder is to be installed to a residential garage. The conductors are insulated and have a voltage of 120 volts to ground. This circuit does not pass over a sidewalk or driveway. What is the minimum height above the ground that must be maintained?
10 ft.
For a one-family dwelling, the service disconnecting means shall have a rating of not less than ___ amperes, 3-wire.
100
An overhead feeder is to be installed to a residential garage. The conductors are insulated and have a voltage of 120 volts to ground. This circuit does not pass over a sidewalk or driveway. What is the minimum height above the ground that must be maintained?
10ft.
Refer to Figure 210.6, shown above. The conductors connected to the terminal lugs are 350 kcmil. The minimum wire bending space required at II is ___ inches. These lugs are NOT removable.
12
Where loads are likely to be ON for 8 hours, the computed load for sizing branch-circuit conductors and OCPDs must be calculated by multiplying the actual load by ___%.
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
How much current can each conductor carry? Six, current-carrying 250 kcmil conductors are run in a pipe that is located in a 129ºF ambient temperature location? The 75ºC OCPD terminations are far away from the high temp area.
176
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
Refer to Figure 208.51. The minimum CALCULATED dimension for "height" is ____ inches. All conducors enter the right size of the pull box and exit the bottom.
18.5
What is the minimum number of 20-ampere branch circuits for small appliances required in a residence?
2
Refer to figure 108.014. Where this kitchen is in a house, which receptacles are required to be GFCI protected?
2,4,11,6,7,8,9 only
What is the cubic-inch allowance for a 10 AWG conductor?
2.50
The minimum CALCULATED dimension for "width" shown in Figure 208.55 is ___ inches. Conduit G=2" Conduit H = 2.5" Conduit J = 1.5" Conduit = 2" Conduit L = 1" Conduit M = 1.5" Conduit N = 2"
20
Where contained in a cable, the Code reference that states when a conductor with white insulation may be used as an underground circuit conductor is in Section...
200.7
Arc-fault requirements for dwelling units are found in Section ___.
210.12
When calculating the size of the required service, you should consult household electric clothes dryer demand factors given in Table ___
220.54
In dwelling units, receptacles supplying countertops in the dining room shall be installed so that no point along the wall is more than ___ inches to the nearest receptacle.
24
Where a 14" section of trade size 3.5 Schedule 40 PVC is installed between enclosures, no more than ___ 2/0 AWG THHN/ THWN conductors can be installed.
26
In a dwelling a receptacle is to be installed on a wall adjacent to a sliding glass door. The door consists of two 3-foot glass panels as shown below (one fixed, one sliding). The distance between points and is 3 feet. The maximum distance between point and the receptacle is ___ feet.
3
One conduit is run from Panel LA to a pull box as shown in Figure 205.13. The 250-amp breaker has 250 kcmil circuit conductors connected to it, and 500 kcmil circuit conductors are connected to the 400-amp breaker. Only one grounding conductor is required in this conduit for all contained circuits. The smallest EGC permitted to be installed in the conduit between the panel and the pull box is ___ AWG.
3
For purposes of calculating a residential service, the general-purpose lighting load is calculated at ___ per square foot of area.
3 volt-amperes
For purposes of calculating a residential service, the general-purpose, lighting load is calculated at ___
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
Schedule 40 PVC is to be installed in a straight run between two junction boxes on the back exterior wall of a strip shopping center. The summertime temperature is 100ºF and the wintertime temperature is -5ºF. An expansion fitting would be required in this 80' run of PVC because it would expand ___ inches between winter and summer.
3.408
The minimum working clearance at at Point X in Figure 201.15 is ___ feet. The panel is 277/480-volt, 3ø, 4W.
3.5
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
the smallest size copper wire permitted to be used as a main bonding jumper in a 200-A main breaker panelboard is ____ AWG. The panel is fed from a transformer with one set of 3/0 AWG wire.
4
The cross-sectional area of a 4 AWG BARE copper conductor is ___ cmils.
41740
Refer to figure 204.3. The wire to Load #3 is 6 AWG, the wire to Load #2 is 1 AWG, and the wire to Load #1 is 2/0 AWG. Each of the loads is 3ø, 3-wire. In the conduit with 9 conductors, how much current can the wire to Load #3 carry in the high-temperature area where the temperature area where the temperature is 121ºF?
43
Refer to Figure 210.6, shown above. The conductors connected to the terminal lugs are 350 kcmil. The minimum wire bending space required at I is ___ inches. These lugs are of the lay-in type.
5
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
The minimum demand for an electric clothes dryer in a residential load calculation is ___ watts.
5000
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 run outside of the flexible conduit to maintain the continuity of the grounding path.
6
Where multiple rod, pipe, or plate electrodes are installed, the shall not be less than ___ apart.
6'
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
The current carried continuously in bare aluminum bars in auxiliary gutters shall not exceed ___ amperes per square inch
700
Refer to Figure 208.12 above. You will need at least ___ straps to support the conduit between enclosures A & B. Trade size 2 IMC with threaded couplings and connectors is used. You will cut and thread the conduit as required. The distance from enclosure A & B is 123 feet.
9
The authority having jurisdiction has the responsibility ___. for enforcing the NEC for approving equipment installations for granting special permission
All of these
Which chapters in the code apply generally?
Chapters 1-4
Live vegetation, such as trees, may support overhead conductor spans.
False
Although a residential basement is unfinished, the homeowner wants several receptacles to be installed. These receptacles are required to be ___.
GFCI protected
When a piece of equipment is connected to the earth, it meets the definition for...
Grounded
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 1.5 square with 5.0in^3 industrial cover. II. 4^11/16 x 1.25 square box with a 4.2in^3 industrial cover III. 4 x 2^1/8 square box with a 3.6in^3 industrial cover
I only
Fuses shall be plainly marked with their ___. I. ampere rating II. voltage rating III. interrupting rating where other than 10,000 amperes
I, II, & III
Which of the drawings, shown above in figure 207.12, fails to satisfy the NEC requirements for conductor length in boxes?
II & III only
The grounded conductor of a branch circuit that is 6 AWG or smaller shall be ___. I. without splices II. white or gray in color
II only
Which of the illustrations shown in Figure 210.1 would satisfy the Code requirements of 240.22 (1)?
II only
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 single-pole circuit breaker III. two single-pole circuit breakers with tie handles
II or III only
When ___ touch together, this is a ground fault. I. two ungrounded circuit conductors II. an ungrounded and a grounded circuit conductor III. an underground circuit conductor and the metal conduit
III only
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
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 are permitted to be buried in a trench underground? The wiring will be covered with stabilized sand to prevent physical damage.
Type MI cable
Where one or more complete paragraphs from the previous edition of the NEC have been deleted in the current edition, the deletion is identified by ___ between the remaining paragraphs.
a bullet
An insulated grounded conductor 6 AWG or smaller can not be identified by___
a conductor with a continuous red outer finish phased with with white tape at the termination points
Which of the following is not permitted to serve as an equipment grounding conductor?
a metallic water piping system
A 23-foot long hallway is shown above in Figure 108.020. If this hallway is in the Mayor's house, how many wall receptacles are required by the NEC®?
at least one
Service disconnecting means shall not be located in ___
bathrooms
Overhead branch circuit and feeder conductors shall not be installed ___ openings through which materials may be moved, such as openings in farm and commercial buildings, and shall not be installed where they will obstruct entrance to these building openings.
beneath
Two 20-ampere small appliance circuits ___ supply more than one kitchen of a dwelling.
cannot
Where installed in a metal raceway, all feeder conductors sharing a common neutral conductor shall be ___.
enclosed within the raceway
Where installed in a metal raceway, all feeder conductors sharing a common neutral conductor shall be ___
enclosed within the same raceway
Informational notes (I-Notes) in the National Electrical Code are ___.
explanatory information (not mandatory)
Informational Notes (I-Notes) in the National Electrical Code are___
exploratory 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 ___.
hallways
Branch circuits are rated according to their ___
overcurrent protective device rating
26 feet of Type AC cable is used to connect a 2 x 4 lay-in fluorescent luminaire to a "home run" box as shown above in Figure 208.2 Supports #1 & #2 are as far from the connectors as the NEC permits. You will have to instal ___ additional supports between #1 and #2.
more than 3
Feeder and service-entrance conductors with demand loads determined by 220.82 are permitted to have the ___ load determined by 220.61.
neutral
Along a kitchen countertop in a restaurant, the maximum spacing between receptacles is ___.
not specified
In general, a building or structure shall be supplied by only ___ service(s)
one
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
The ampacity of an insulated conductor is ___
the maximum amount f current it can carry continuously without damage to the insulation
In your home, Circuit 22 supplies the upper half and Circuit 24 supplies the lower half of a duplex receptacle. These breakers are permitted to be ___
two individual single-pole circuit breakers
