NEC final
If all terminals are rated for 75°C, what minimum size THW conductor is needed for a branch circuit supplying a 40 gallon water heater rated 240V at 22A?
#10 AWG
What is the minimum size service entrance conductor needed to feed a water heater rated at 120V, 5A?
#14AWG Cu
What minimum size THWN conductor is required for a branch circuit powering a 10HP, 230V single phase squirrel cage motor? (all terminals rated for 75°C)
#6 AWG
A 45' straight horizontal run of schedule 80 PVC between junction boxes in an area where it will be subject to a temperature change of 15°F will have a ______" expansion/contraction in length. Correct Answer
.2745"
A minimum size of ______" EMT is required to hold four #12 AWG THHN, four #10 AWG THHN and four #8 AWG THHN
1
Where a NM cable is installed through bored holes in wood members, the holes shall be bored so that the edge of the hole is not less than _____" from the nearest edge of the wood member.
1 ¼
A RMC run underneath a metal-corrugated sheet roof decking shall be installed so there is not less than ______" between the lowest surface of the roof decking and the top of the RMC.
1-1/2
In damp or wet locations, surface-type cabinets shall be placed or equipped so as to prevent moisture from entering and accumulating within the cabinet, and shall be mounted so that there is at least _______" airspace between the enclosure and the wall.
1/4
The front edge of a box installed in a drywall(gypsum) wall shall be made so that the front edge of the box will not be set back more than ______" from the finished surface.
1/4
Noncombustible surfaces that are broken or incomplete shall be repaired so there will be no gaps or open spaces greater than _______ in. at the edge of a cabinet or cutout box employing a flush-type cover.
1/8
An enclosure mounted to structural or supporting elements of a suspended ceiling shall be not more than ________cu. in. in size.
100
Handhole enclosure covers shall require the use of tools to open, or they shall weigh over __ lb.
100
Ground-fault protection of equipment shall be provided for solidly grounded wye electrical systems of more than 150 volts-to-ground, but not exceeding 1,000V phase-to-phase for each individual device used as a building or structure main disconnecting means rated __ or more, unless specifically exempted.
1000A
What is the minimum size equipment grounding conductor needed for equipment fed from a 40A breaker?
10AWG
A 14-2 UF cable is run underground to a 120V post light under the yard of a residence. The circuit is protected with a 15A GFCI breaker, the minimum burial depth required is ________in.
12
Transformers not over 112 ½ kVA installed indoors shall have a separation of at least ______in. from combustible material.
12
Underground service conductors that supply power to limited loads of a single branch circuit shall not be smaller than _____________ .
12 AWG Copper
Sign and outline lighting outlets shall be calculated at a minimum of ______________ volt-amperes for each required branch circuit specified in 600.5(A).
1200
A transformer with no secondary protection has a primary rated at 480V at 14A. the primary overcurrent device can be sized no more than ________% of the rated primary current.
125
Conductors for a continuous duty motor shall be sized no less than _________% of the motor full load current.
125
What is the minimum vertical clearance needed for 240V overhead service conductors above a residential driveway?
12ft
The minimum bending radius for a 1" nonmetallic underground conduit with conductors (NUCC) is ___________".
14
The minimum size copper conductor permitted for branch circuits under 600V is ______AWG.
14
What is the full load current for a three phase 208V, 5H.P. wound rotor motor?
16.7
Receptacle outlets in or on floors shall not be counted as part of the required number of receptacle outlets for dwelling unit wall spaces, unless they are located within _____ in. of the wall.
18
If a set of 120/240V overhead feeder conductors terminates at a through-the-roof raceway or approved support, with not more than 6 ft of these conductors, 4 ft horizontally, passing over the roof overhang, the minimum clearance above the roof for these conductors is not less than ___________.
18 in
Where used outside, aluminum or copper-clad aluminum grounding electrode conductors shall not be terminated within _______ of the earth.
18 in
Any combustible ceiling finish that is exposed between the edge of a ceiling-suspended (paddle) fan canopy or pan and an outlet box and that has a surface area of _____ sq in. or more shall be covered with noncombustible material.
180
For other than dwelling occupancies, banks, or office buildings, each receptacle outlet shall be calculated at not less than _________ VA.
180
Exposed Type NM cable is permitted to be installed in types of construction other than type ___________.
2 (II)
A bare 4 AWG copper conductor installed horizontally near the bottom or vertically, and within that portion of a concrete foundation or footing that is in direct contact with the earth, can be used as a grounding electrode when the conductor is at least _____ ft in length.
20
The area permissible for filling a 10" x 10" metal wireway is _________ sq. in.
20
What is the minimum length between conduit entries required for a straight pull box that contains four #1/0 THW inside of a 2 ½" EMT?
20"
The total volume occupied by two internal cable clamps, six 12 AWG conductors, and a single-pole switch is _______ cu in.
20.25
Receptacles rated __________ or less directly connected to aluminum conductors shall be listed and marked CO/ALR.
20A
Type PFAH insulated conductors are rated for _______°C
250
A 3/8" FMC ,using fittings inside the conduit, is permitted to contain a maximum of ________ #14 AWG TFN conductors.
3
Conduits and raceways, including end fittings, shall not rise more than in. above the bottom of a switchboard enclosure.
3
The recommended maximum total voltage drop on branch circuit conductors is ____ %.
3
Schedule 40 PVC shall be secured within ____________ of the junction box.
3'
The maximum trade size FMT is _________.
3/4
Where the number of current-carrying conductors contained in a sheet metal auxiliary gutter is ____ or less, the adjustment factors of 310.15(C)(1) shall not apply.
30
Where rock bottom is encountered when driving a ground rod at an angle up to 45°, the electrode can be buried in a trench that is at least ______________ deep.
30 in.
Plate electrodes shall be installed not less than __________ below the surface of the earth.
30"
Underground service conductors shall be protected from damage in accordance with ___________ including minimum cover requirements.
300.5
For feeder installations consisting of not more than two 2-wire branch circuits, the building disconnecting means shall have a rating of not less than ____________.
30A
When a ground ring is used as a grounding electrode, it shall be buried at a depth below the earth's surface of not less than _________.
30in
Type S fuses shall be classified at not over 125V for the following ampacity ranges except _____.
31-40A
What is the de-rated ampacity of a #10 AWG THHN run in an ambient temperature of 110°F?
34.8A
Listed outlet boxes to support ceiling-suspended fans that weigh more than ________ lb shall have the maximum allowable weight marked on the box.
35
An in-sink waste disposer can be cord-and-plug-connected, but the cord shall not be less than 18 in. or more than_________ in. in length.
36
For EMT, there shall not be more than __________ ⁰ total of bend between pull points.
360
A box fits 8 wires. You install two duplex receptacles. How many wires can the box fit now?
4
When sizing a feeder for the fixed appliance loads in dwelling units, a demand factor of 75 percent of the total nameplate ratings can be applied if there are _____ or more appliances fastened in place on the same feeder.
4
A demand factor of _____ percent applies to a multifamily dwelling with ten units if the optional calculation method is used.
43
Where fixed multioutlet assemblies are used in other than dwelling units or the guest rooms of hotels or motels, each __ ft or fraction thereof of each separate and continuous length shall be considered as one outlet of not less than 180 VA where appliances are unlikely to be used simultaneously.
5
Grounding electrodes of the rod type less than _____________ in. in diameter shall be listed.
5/8
Boxes mounted for ceiling outlets used exclusively for lighting shall be required to support a luminaire weighing a minimum of _________ lb.
50
The total rating of utilization equipment fastened in place shall not exceed ____________ % of the branch circuit ampere rating where lighting units and cord and plug connected utilization equipment are supplied.
50
Conductors located above an electric space-heated ceiling are considered to be operating in an ambient temperature of _______ .
50°c
A NM cable making a penetration through a floor shall be protected from physical damage where necessary by an approved raceway extending at least _______" above the floor. Correct!
6
An insulated grounded conductor _______ AWG or smaller shall be identified by a continuous white or gray outer finish, or by three continuous white or gray stripes along its entire length on other than green insulation.
6
Grounding electrode conductors ________ AWG and larger that are not exposed to physical damage can be run along the surface of the building construction without metal covering or protection.
6
If multiple rod, pipe or plate electrodes are installed, they shall not be less than ______ ft apart.
6
Torque requirements for motor control circuit device terminals shall be a minimum of ___ lb-in. (unless otherwise identified) for screw-type pressure terminals used for 14 AWG and smaller copper conductors.
7
There are __________W per Horsepower in a 100% efficient electric motor.
746
Splices are permitted in the cabinets containing switch and overcurrent devices as long as they do not exceed more than _____% of the cross-sectional area of that space.
75
A USE cable feeds a 240/120V residential service shall be protected by an enclosure or raceway extending from the minimum cover distance below grade to a point at least ________' above finished grade.
8
Where six current carrying conductors are run in the same conduit or cable, the ampacity of each conductor shall be adjusted by a factor of ________ percent.
80
If the circuit's overcurrent device exceeds _________, the conductor ampacity must have a rating not less than the rating of the overcurrent device.
800A
To determine the feeder calculated load for ten 3 kW household cooking appliances, use _____ of Table 220.55.
Column A
Grounded electrical systems shall be connected to earth in a manner that will ______________.
D. both A and B
If the 15 kW or smaller portable generator was manufactured or remanufactured prior to __________ , listed cord sets or devices incorporating listed GFCI protection for personnel identified for portable use shall be permitted.
January 1, 2015
On a three-phase, 4-wire, delta-connected service where the midpoint of one phase winding is grounded, the service conductor having the higher phase voltage-to-ground shall be durably and permanently marked by an outer finish that is _______ in color, or by other effective means, at each termination or junction point.
Orange
Luminaires containing a metal halide lamp (other than a thick-glass PAR lamp) shall be provided with a containment barrier that encloses the lamp, or shall be provided with a physical means that only allows the use of a(n) __________.
Type O lamp
A three-phase, 4-wire, __ power system used to supply power to nonlinear loads may necessitate that the power system design allow for the possibility of high harmonic currents on the neutral conductor.
Wye connected
Overcurrent devices are not permitted to be located in the bathrooms of_____________.
all of these
Parallel conductors shall have the same ___________.
all of these
In an FMC installation, _________ connectors shall not be concealed.
angle
The continuity of a grounded conductor shall not depend on a connection to__________.
any of these
When installed underground, all conductors of the same circuit, and where used, the grounded conductor and all equipment grounding conductors shall be installed ___________.
any of these
FMC shall be supported and secured _________________.
at intervals not exceeding 4 1/2 ft
Outside feeder tap conductors can be of unlimited length without overcurrent protection at the point they receive their supply if the tap conductors __________________________________ .
both of these
_____________________ shall not be used as grounding electrodes.
both of these
A premises wiring system supplied by a grounded AC service shall have a grounding electrode conductor connected to the grounded service conductor at _______________.
each service
In determining the highest rated motor for purposes of complying with 430.24, 430.53(8), and 430.53(C), the highest rated motor shall be based on the rated full-load current as selected ____________________.
from Tables 430.247, 430.248, 430.249, and 430.250
The motor ___________ currents listed in Tables 430.247 through 430.250 shall be used to determine the ampacity of motor circuit conductors and short-circuit and ground-fault protection devices.
full-load
Where it is unlikely that two or more noncoincidental loads will be in use simultaneously, only the ___________ the loads used at one time is required to be used in computing the total load to a feeder.
largest of
Storage batteries, other than lead-acid batteries, and battery management equipment shall be ____________.
listed
The grounded conductor of an alternating-current system operating at 1,000V or less shall be routed with the ungrounded conductors and connected to each disconnecting means grounded conductor terminal or bus, which is then connected to the service disconnecting means enclosure via a(n) _______ that is installed between the service neutral conductor and the service disconnecting means enclosure.
main bonding jumper
The conductors used to connect the surge protective device to the line or bus and to ground shall not be any longer than ________ and shall avoid unnecessary bends.
necessary
Separately derived system generators shall have the _________ conductor sized not smaller than required to carry the maximum unbalanced current as determined by 220.61.
neutral
Cut ends of RMC shall be _______ or otherwise finished to remove rough edges.
reamed
Additional services shall be permitted for a single building or other structure sufficiently large to make two or more services necessary if permitted by ______________ .
special permission
The motor branch-circuit short-circuit and ground-fault protective device shall be capable of carrying the __________ current of the motor.
starting
Cabinets, cutout boxes, and meter socket enclosures installed in wet locations shall be _______.
weatherproof
Wire installed in a conduit, located in a trench filled with concrete, are installed in a __________ location.
wet
____________ is not permitted to be installed in a cable tray.
Single conductor cable smaller than 1/0 AWG
Cut ends of PVC conduit shall be __________ to remove the burrs and rough edges.
Trimmed
The conduit run in question 35 requires an expansion fitting.
yes