1b electrical
Liquidtight flexible metal conduit shall be securely fastened by a means approved by the authority having jurisdiction within _____ of termination.
1 ft
If a protective device rating is marked on an appliance, the branch-circuit overcurrent device rating shall not exceed _____ percent of the protective device rating marked on the appliance.
100
Type AC cable shall be secured at intervals not exceeding 4 1/2 ft and within _____ in. of every outlet box, cabinet, conduit body, or fitting.
12
What is the minimum cover requirement for Type UF cable supplying power to a 120V, 15A GFCI-protected circuit outdoors under a driveway of a one-family dwelling?
12 in.
Cables laid in wood notches require protection against nails or screws by using a steel plate at least _____ in. thick, installed before the building finish is applied.
1/16
For interior installations of Type SE cable with ungrounded conductor sizes _____ AWG and smaller, where installed in thermal insulation, the ampacity shall be in accordance with the conductor's temperature rating.
10
Low-voltage lighting systems shall be installed not less than _____ ft horizontally from the nearest edge of the water in pools, spas, fountains, or similar locations, unless permitted by Article 680.
10
Resistor R1 has a resistance of 5 ohms and resistors R2, R3, and R4 have a resistance of 15 ohms each. The total resistance of this series-parallel circuit is _____. See Figure.
10 ohms
A multipole, general-use snap switch shall not be fed from more than a single circuit unless it is listed and marked as a _____ switch.
2-circuit 3-circuit a or b
The opening of the ungrounded or grounded conductor of a _____ circuit during the replacement of a device does not cause a safety hazard, so pigtailing of these conductors is not required.
2-wire
Receptacles rated _____ or less and designed for the direct connection of aluminum conductors shall be listed and marked CO/ALR.
20A
What is the nameplate FLA for a 5 hp, 230V, single-phase motor, with 93 percent power factor and 87 percent efficiency?
20A
A 3-conductor SJE cable (one conductor is used for grounding) has a maximum ampacity of _____ for each 16 AWG conductor.
13A
The minimum size copper conductor permitted for branch circuits under 600V is _____ AWG.
14
If a branch circuit supplies a single nonmotor-operated appliance, the rating of overcurrent protection shall not exceed _____ percent of the appliance rated current if the overcurrent protection rating is not marked and the appliance is rated over 13.30A.
150
Short-circuit and ground-fault protection for an individual air-conditioner motor-compressor shall not exceed _____ percent of the motor-compressor rated-load current or branch-circuit selection current, whichever is greater.
175
The smallest size fixture wire permitted by the NEC is _____ AWG.
18
Conduits and raceways, including end fittings, shall not rise more than _____ in. above the bottom of a switchboard enclosure.
3
For liquidtight flexible metal conduit, if flexibility is necessary after installation, unsecured lengths from the last point the raceway is securely fastened shall not exceed _____.
3 ft for trade sizes 1/2 through 1 1/4 4 ft for trade sizes 1 1/2 through 2 5 ft for trade sizes 2 1/2 and larger Correct! all of these
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
PVC conduit shall be securely fastened within _____ in. of each box.
36
Motor control circuit transformers, with a primary current rating of less than 2A, can have the primary protection device set at no more than _____ percent of the rated primary current rating
500
The allowable ampacity of 18 TFFN is _____.
6A
Where Type TC-ER cable is used to connect a generator and associated equipment having terminals rated _____ or higher, the cable shall not be limited in ampacity by 334.80 or 340.80.
75º C
The insulation temperature rating of conductors in Type NM cable shall be _____.
90º C
_____ is defined as the area between the top of direct-burial cable and the top surface of the finished grade.
Cover
The ampacity adjustment factors of Table 310.15(B)(3)(a) do not apply to Type AC or Type MC cable without an overall outer jacket, if which of the following condition(s) is(are) met?
Each cable has not more than three current-carrying conductors. The conductors are 12 AWG copper. No more than 20 current-carrying conductors are installed without maintaining spacing. all of these
Motors must be protected against excessive winding heat by a properly sized overload protection device based on the motor _____ current rating.
FLA
According to the equal resistance method, when all the resistances of the parallel circuit have the same resistance, divide the resistance of one element by the largest resistor in parallel.
False
Conduit bodies containing conductors larger than 6 AWG shall have a cross-sectional area at least twice that of the largest conduit to which they can be attached.
False
Flexible cord sets and power-supply cords shall not be permitted above suspended or dropped ceilings even if contained within an enclosure for use in "other spaces used for environmental air."
False
If a permanently installed electric baseboard heater has factory-installed receptacle outlets, the receptacle is permitted to be connected to the heater circuits.
False
In a parallel circuit, the total circuit resistance is always greater than the smallest resistance.
False
Incandescent luminaires that have open lamps, and pendant-type luminaires, shall be permitted in clothes closets where proper clearance is maintained from combustible products.
False
Low-voltage lighting systems can be concealed or extended through a building wall, floor, or ceiling without regard to the wiring method used.
False
Panelboard circuit directories can include labels that depend on transient conditions of occupancy.
False
Which of the following switches shall indicate whether they are in the open (off) or closed (on) position?
General-use switches. Motor-circuit switches. Circuit breakers. all of these
_____ clips identified for use with the type of ceiling framing member(s) and luminaires shall be permitted to be used to secure luminaires to the ceiling framing members.
Listed
Luminaires and equipment shall be mechanically connected to an equipment grounding conductor as specified in 250.118 and shall be sized in accordance with _____.
Table 250.122
Type _____ cable is a fabricated assembly of insulated conductors in a flexible interlocked metallic armor.
AC
The number of conductors permitted in LFNC shall not exceed the percentage fill specified in _____.
Chapter 9, Table 1
The number of conductors permitted in PVC conduit shall not exceed the percentage fill specified in _____.
Chapter 9, Table 1
A balanced multiwire branch circuit has current flow only on the ungrounded conductors.
True
A motor must have two opposing magnetic fields in order to rotate. The stationary field winding is mounted on the stator, and the rotating part is referred to as the armature.
True
A multiwire circuit has two or more ungrounded conductors having a potential difference between them, and having an equal difference of potential between each ungrounded conductor and the neutral conductor.
True
Boxes, conduit bodies, and fittings installed in wet locations shall be listed for use in wet locations.
True
Conductors shall be permitted for use in any of the wiring methods recognized in Chapter 3 and as permitted in the NEC.
True
Current for the field winding can be supplied from the dc generator output or by an external dc voltage source.
True
Each current-carrying conductor of a paralleled set of conductors shall be counted as a current-carrying conductor for the purpose of applying the adjustment factors of 310.15(B)(3)(a).
True
Each motor shall be provided with an individual controller.
True
Electrons leaving a power supply are always trying to return to the same power supply; they are not trying to go into the earth.
True
Fixture wires shall not be used for branch-circuit wiring, except as permitted in other articles of the Code.
True
Isolated ground receptacles installed in nonmetallic boxes shall be covered with a nonmetallic faceplate, unless the box contains a feature or accessory that permits the effective grounding of the faceplate.
True
Kirchoff's Voltage Law states, "In a series circuit, the sum of the voltage drops across all of the resistors equals the applied voltage."
True
Lampholders of the screw-shell type shall be installed for use as lampholders only.
True
Low-voltage lighting systems shall be listed or assembled with listed components.
True
Luminaires can be used as a raceway for circuit conductors only when listed and marked for use as a raceway.
True
Luminaires that require adjusting or aiming after installation can be cord connected without an attachment plug provided the exposed cord is suitable for hard-usage or extra-hard-usage and is not longer than that required for maximum adjustment.
True
Motor controllers and terminals of control circuit devices shall be connected with copper conductors unless identified for use with a different conductor.
True
No conductor shall be used where its operating temperature exceeds that designated for the type of insulated conductor involved.
True
On a three-phase, 4-wire, wye circuit, where the major portion of the load consists of nonlinear loads, the neutral conductor shall be counted when applying 310.15(B)(3)(a) adjustment factors.
True
Switches shall not be installed within tubs or shower spaces unless installed as part of a listed tub or shower assembly.
True
That portion of the series-parallel circuit that contains resistances in parallel must comply with the rules for parallel circuits.
True
That portion of the series-parallel circuit that contains resistances in series must comply with the rules for series circuits.
True
The NEC allows a lighting outlet on the wall in a clothes closet when it is at least 6 in. away from storage space.
True
The actual motor current depends upon the load on the motor and the operating voltage at the motor terminals.
True
Type MC cable installed through, or parallel to, framing members shall be protected against physical damage from penetration by screws or nails by 1 1/4 in. separation or protected by a suitable metal plate.
True
Type NM cable shall closely follow the surface of the building finish or running boards when run exposed.
True
Type SE cable can be used for interior wiring as long as it complies with the installation requirements of Part II of Article 334, excluding 334.80.
True
Type TC cable can be used in one- and two-family dwelling units.
True
Type TC-ER cable used for interior wiring in one- and two-family dwelling units that is suitable for pulling through structural members is marked "TC-ER-JP."
True
Type UF cable is permitted to be used for inside wiring.
True
Type UF cable shall not be used where subject to physical damage.
True
Type USE cable used for service laterals shall be permitted to emerge from the ground if terminated in an enclosure at an outside location and protected in accordance with 300.5(D).
True
Unless specifically permitted in 400.10, flexible cables, flexible cord sets, and power-supply cords shall not be used where subject to physical damage.
True
When IMC is cut in the field, reaming is required to remove the burrs and rough edges.
True
When determining the number of current-carrying conductors, a grounding or bonding conductor shall not be counted when applying the provisions of 310.15(B)(3)(a).
True
When electric-discharge and LED luminaires that are designed not to be supported solely by the outlet box are surface mounted over a concealed outlet box, the luminaire shall provide access to the wiring within the outlet box by means of suitable openings in the back of the luminaire.
True
When power supplies are connected in parallel, the voltage remains the same, but the current or amp-hour capacity will be increased.
True
When working with series-parallel circuits, it is best to redraw the circuit so you can see the series components and the parallel branches.
True
Where Type TC cable is installed in one- and two-family dwelling units, 725.136 provides rules for limitations on Class 2 or 3 circuits contained within the same cable with conductors of electric light, power, or Class 1 circuits.
True
Bonded 15 kW or smaller portable generators shall be provided with GFCI protection on all 125V, _____ receptacle outlets.
a and b
Electric space-heating cables shall not be installed _____.
a and b
Overload devices are intended to protect motors, motor control apparatus, and motor branch-circuit conductors against _____.
a and b
Range hoods shall be permitted to be cord-and-plug-connected with a flexible cord identified as suitable for use on range hoods in the installation instructions of the appliance manufacturer provided _____.
a and b
The GFCI required for appliances shall be readily accessible, listed, and _____.
a and b
The disconnecting means for air-conditioning and refrigerating equipment shall be _____ from the air-conditioning or refrigerating equipment.
a and b
The wiring space within enclosures for switches and overcurrent devices shall be permitted for other wiring and equipment subject to limitations for specific equipment as provided in _____.
a and b
_ rated 250V or less and 60A or less, single- or 3-phase, shall be provided with GFCI protection for personnel.
a and b
The allowable ampacity of flexible cords and flexible cables is found in _____.
Tables 400.5(A)(1) and (2)
ENT and fittings can be _____, provided fittings identified for this purpose are used.
encased in poured concrete embedded in a concrete slab on grade where the tubing is placed on sand or approved screenings Correct Answer a or b
A motor can be provided with combined overcurrent protection using a single protective device to provide branch-circuit _____ protection where the rating of the device provides the overload protection specified in 430.32.
all of these
An attachment plug and receptacle can serve as the disconnecting means for cord-connected _____.
all of these
Electric space-heating cables shall not be installed _____.
all of these
Equipment such as _____ shall be considered appliances, and the provisions of Article 422 apply in addition to those of Article 440.
all of these
Factors that impact the available short-circuit current include circuit conductor _____.
all of these
Ground-fault circuit-interrupter protection for personnel shall be provided for cables installed in electrically heated floors of _____.
all of these
Means shall be provided to simultaneously disconnect the _____ of all fixed electric space-heating equipment from all ungrounded conductors.
all of these
The motor disconnecting means shall not be required to be in sight from the motor and the driven machinery location, provided _____.
all of these
rated 250V or less and 60A or less, single- or 3-phase, shall be provided with GFCI protection for personnel.
all of these
Joints between PVC conduit, couplings, fittings, and boxes shall be made by _____.
an approved method
Joints between lengths of ENT, couplings, fittings, and boxes shall be made by _____.
an approved method
Listed tamper-resistant receptacles shall be provided where replacements are made at receptacle outlets that are required to be tamper-resistant elsewhere in this Code except where a non-grounding receptacle is replaced with _____ receptacle
another non-grounding
Constant-voltage generators, except ac generator exciters, shall be protected from overload by _____ or other acceptable overcurrent protective means suitable for the conditions of use.
any of these
The GFCI required for appliances shall be readily accessible, listed, and located _____.
any of these
The rules of _____, as applicable, shall apply to air-conditioning and refrigerating equipment that does not incorporate a hermetic refrigerant motor-compressor.
any of these
Where corrosion protection is necessary for ferrous metal equipment and the conduit is threaded in the field, the threads shall be coated with a(n) _____ electrically conductive, corrosion-resistant compound.
approved
LFMC shall be supported and secured _____.
at intervals not exceeding 4 1/2 ft
Flexible cords and flexible cables shall be protected by _____ where passing through holes in covers, outlet boxes, or similar enclosures.
bushings fittings a or b
IMC shall be secured _____.
by fastening within 3 ft of each outlet box, junction box, device box, cabinet, conduit body, or other conduit termination within 5 ft of a box or termination fitting when structural members do not readily permit the raceway to be secured within 3 ft of the termina-tion except when the IMC is within 3 ft of the service head for an above-the-roof termination of a mast Correct Answer any of these
Extreme _____ may cause PVC conduit to become brittle, and therefore more susceptible to damage from physical contact.
cold
In walls constructed of wood or other _____ material, electrical cabinets shall be flush with the finished surface or project therefrom.
combustible
DC motors use brushes with springs to hold them in contact with a(n) _____.
commutator
Galvanized steel, stainless steel and red brass RMC elbows, couplings, and fittings shall be permitted to be installed in concrete, in direct contact with the earth, or in areas subject to severe corrosive influences when protected by _____ approved for the condition.
corrosion protection
Running threads shall not be used on RMC for connection at _____.
couplings
All conductors of the same circuit, including the grounded and equipment grounding conductors and bonding conductors shall be contained within the same _____, unless otherwise permitted elsewhere in the Code.
raceway cable trench all of these
Backfill used for underground wiring shall not damage _____ or prevent adequate compaction of fill or contribute to corrosion.
raceways cables conductors all of these
The _____ current for a hermetic refrigerant motor-compressor is the current resulting when the motor-compressor is operated at the rated load, rated voltage, and rated frequency of the equipment it serves.
rated-load
Cut ends of RMC shall be _____ or otherwise finished to remove rough edges.
reamed
Branch-circuit conductors to individual appliances shall not be sized _____ than required by the appliance markings.
smaller
The number of fixture wires in a single conduit or tubing shall not exceed the percentage fill specified in _____.
hapter 9, Table 1
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, including fundamental and harmonic currents.
heat
When non-grounding-type receptacles are replaced by GFCI-type receptacles where attachment to an equipment grounding conductor does not exist in the receptacle enclosure, _____ shall be marked "No Equipment Ground."
hese receptacles their cover plates a or b
Conductors rated at a temperature _____ than the listed temperature rating of PVC conduit shall be permitted to be installed in PVC conduit, provided the conductors are not operated at a temperature above the raceway's listed temperature rating.
higher
Switches and circuit breakers used as switches can be mounted _____ if they are installed adjacent to motors, appliances, or other equipment that they supply and are accessible by portable means.
higher than 6 ft 7 in.
The most effective way to reduce conductor voltage drop and power loss is to lower the current flowing through the conductors. This is accomplished by _____ the transmission voltage.
increasing
Central heating equipment, other than fixed electric space-heating equipment, shall be supplied by a(n) _____ branch circuit.
individual
PVC conduit shall not be used _____, unless specifically permitted.
in hazardous (classified) locations for the support of luminaires or other equipment where subject to physical damage unless identified for such use Correct! all of these
A short circuit is a _____ electrical connection between any two conductors of the electrical system.
ine-to-line line-to-neutral a or b
Insulated secondary circuit conductors of low-voltage lighting systems shall be _____.
installed not less than 7 ft above the finished floor unless listed for a lower installation height
Type TC cable shall not be _____.
installed where it will be exposed to physical damage installed outside of a raceway or cable tray system, unless permitted in 336.10(4), 336.10(7), 336.10(9), and 336.10(10) used where exposed to direct rays of the sun, unless identified as sunlight resistant Correct Answer all of these
Type USE cable is not permitted for _____ wiring.
interior
Grommets or bushings for the protection of Type NM cable installed through or parallel to framing members shall be _____ for the purpose.
listed
Type AC cable and associated fittings shall be _____.
listed
Type TC cable and associated fittings shall be _____.
listed
Type UF cable and associated fittings shall be _____.
listed
Types SE and USE cables and associated fittings shall be _____.
listed
Unbonded 15 kW or smaller portable generators with both 125V and 125/250V receptacle outlets shall have _____ GFCI protection for personnel integral to the generator or receptacle on all 125V, 15A and 20A receptacle outlets.
listed
The purpose or use of panelboard circuits and circuit _____, including spare positions, shall be legibly identified on a circuit directory located on the face or inside of the door of a panelboard, and at each switch or circuit breaker in a switchboard or switchgear.
modifications
A(n) _____ conductor that carries only the unbalanced current from other conductors of the same circuit shall not be required to be counted when applying the provisions of 310.15(B)(3)(a).
neutral
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
Appliances that have a unit switch with a marked-_____ position that disconnects all the ungrounded conductors can serve as the appliance disconnecting means.
off
Flexible cord sets and power-supply cords shall not be concealed behind building _____, or run through doorways, windows, or similar openings.
structural ceilings suspended or dropped ceilings floors or walls all of these
A listed expansion/deflection fitting or other approved means shall be used where a raceway crosses a _____ intended for expansion, contraction or deflection used in buildings, bridges, parking garages, or other structures.
structural joint
EMT shall not be used where _____.
subject to severe physical damage used for the support of luminaires except conduit bodies no larger than the largest trade size of the tubing Correct Answer a and c
A panelboard shall be protected by an overcurrent device within the panelboard, or at any point on the _____ side of the panelboard.
supply
Wiring methods installed behind panels that allow access shall be _____ according to their applicable articles.
supported
Kirchoff's Current Law states, "In a series circuit, the current is _____ through the transformer, the conductors, and the appliance."
the same
Surface extensions shall be made by mounting and mechanically securing an extension ring over the box, unless otherwise permitted.
true
The cut ends of PVC conduit shall be trimmed to remove the burrs and rough edges.
true
Type AC cable installed through, or parallel to, framing members shall be protected against physical damage from penetration by screws or nails.
true
All cut ends of LFMC conduit shall be _____ inside and outside to remove rough edges.
trimmed
A series circuit is a circuit in which a specific amount of current leaves the voltage source and flows through every electrical device in a single path before it returns to the voltage source.
true
Aluminum RMC shall be permitted to be installed where approved for the environment.
true
Article 400 covers general requirements, applications, and construction specifications for flexible cords and flexible cables.
true
EMT shall not be threaded.
true
ENT shall be installed as a complete system in accordance with 300.18 and shall be securely fastened in place by an approved means and supported in accordance with 362.30(A) and (B).
true
In switchboards, switchgear, and panelboards, load terminals for field wiring shall be so located that it is not necessary to reach across or beyond a(n) _____ ungrounded bus in order to make connections.
uninsulated
When calculating box fill, each space within a box installed with a barrier shall be calculated separately.
true
Where PVC conduit enters a box, fitting, or other enclosure, a bushing or adapter shall be provided to protect the conductor from abrasion unless the design of the box, fitting, or enclosure affords equivalent protection.
true
Where Type NM cable is run at angles with joists in unfinished basements and crawl spaces, it is permissible to secure cables not smaller than _____ AWG conductors directly to the lower edges of the joist.
two, 6 three, 8 A or b
Cabinets, cutout boxes, and meter socket enclosures installed in wet locations shall be _____.
weatherproof
Materials such as straps, bolts, screws, and so forth, which are associated with the installation of IMC in wet locations shall be _____.
weatherproof protected against corrosion by corrosion-resistant materials B or C
What is the neutral current for a 4-wire, 120/208V circuit, where L1 = 20A, L2 = 20A, and L3 = 20A?
0A
A cable, raceway, or box installed under metal-corrugated sheet roof decking shall be supported so the top of the cable, raceway, or box is not less than _____ in. from the lowest surface of the roof decking to the top of the cable, raceway, or box.
1 1/2
A parallel circuit has three resistors. One resistor is rated 2 ohms, one is rated 3 ohms, and the other is rated 5 ohms. The total resistance of the parallel circuit is _____. Remember, the total resistance of any parallel circuit is always less than the smallest resistor.
1 ohm
Determine the total circuit resistance of the parallel circuit shown in the Figure based on the following facts:1. The current on ammeter 1 reads 0.75A.2. The voltage of the circuit is 30V.3. Bell 2 has a resistance of 48 ohms.Tip: The total resistance of a parallel circuit is always less than the smallest resistor.
22 ohms
A step-up substation located at the generating facilities transforms the 13.80 kV generator output to _____.
69 kV or higher
No matter how many resistances there are in a series circuit, the sum of the voltages across all of the resistances equals the voltage of the source according to the Law of Proportion.
False
To prevent fires and electric shock, the NEC specifies that neutral current can flow on metal parts of the electrical system.
False
The advantage of the reciprocal method is that the formula can be used for as many resistances as the parallel circuit contains.
True
The current of the circuit can be determined by the formula I = ES/RT.
True
The grounded conductor is a conductor that is intentionally grounded to the earth.
True
As current flows through the element of a fuse, it generates heat. When a sustained overload occurs, the heat melts _____, stopping the flow of current.
a portion of the element
For locations not specifically identified in Table 300.5, a lesser cover depth than required in Column 5 shall be permitted where specified in the installation instructions of a(n) _____ low-voltage lighting system.
listed
Where portions of a cable raceway or sleeve are subjected to different temperatures and condensation is known to be a problem, the _____ shall be filled with an approved material to prevent the circulation of warm air to a colder section of the raceway or sleeve.
raceway sleeve a or b
Type UF cable can be used in commercial garages.
False
A balanced 3-wire, 120/240V, single-phase circuit is connected so that the ungrounded conductors are from different transformer phases (Line 1 and Line 2). The current on the neutral conductor is _____ percent of the ungrounded conductor current.
0
If the neutral of the circuit in the diagram is opened, the circuit becomes one series circuit of 240V. Under this condition, the current of the circuit is _____. Tip: Determine the total resistance. See Figure.
0.58A
The reading of Voltmeter 2 (V2) is _____. See Figure.
1.50V
In general, the minimum size conductor permitted for use in parallel installations is _____ AWG.
1/0
Sectioned equipment grounding conductors smaller than _____ AWG shall be permitted in multiconductor cables, if the combined circular mil area of the sectioned equipment grounding conductors in each cable complies with 250.122.
1/0
Surface-type cabinets, cutout boxes, and meter socket enclosures in damp or wet locations shall be mounted so there is at least _____-in. airspace between the enclosure and the wall or supporting surface.
1/4
An exposed wiring system for indoor wet locations where walls are frequently washed shall be mounted so that there is at least a _____ between the mounting surface and the electrical equipment.
1/4-in. airspace
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
For permanently connected motor-operated appliances with motors rated over _____, a switch or circuit breaker located within sight from the motor-operated appliance, or be capable of being locked in the open position in compliance with 110.25, can serve as the appliance disconnect.
1/8 hp
Nonmetallic-sheathed cables can enter the top of surface-mounted cabinets, cutout boxes, and meter socket enclosures through nonflexible raceways not less than 18 in. and not more than _____ ft in length if all of the required conditions are met.
10
When supplying a room air conditioner rated 120V, the length of a flexible supply cord shall not exceed _____ ft.
10
The reading on Voltmeter 2 (V2) is _____. See Figure.
10V
The ampacity of the conductors from the generator output terminals to the first distribution device(s) containing overcurrent protection shall not be less than _____ percent of the nameplate current rating of the generator.
115
Direct-buried service conductors that are not encased in concrete and that are buried 18 in. or more below grade shall have their location identified by a warning ribbon placed in the trench at least _____ in. above the underground installation.
12
A fixed storage-type water heater having a capacity of _____ gallons or less shall be considered a continuous load for the purposes of sizing branch circuits.
120
Distribution transformers reduce the primary distribution voltage to secondary distribution voltage, such as _____.
120/208V 120/240V 277/480V Correct! any of these
Three-phase ac generators have three equally spaced windings, _____ out-of-phase with each other.
120°
Branch-circuit conductors supplying a single air-conditioner motor-compressor shall have an ampacity not less than _____ percent of either the motor-compressor rated-load current or the branch-circuit selection current, whichever is greater.
125
Conductors supplying several motors shall not be sized smaller than _____ percent of the full-load current rating of the highest rated motor, plus the sum of the full-load current ratings of all other motors in the group, plus the ampacity of other loads.
125
Individual circuits for nonmotor-operated appliances that are continuously loaded shall have the branch-circuit rating sized not less than _____ percent of the appliance marked ampere rating, unless otherwise listed.
125
Receptacle outlets that are a part of a _____ kW or smaller portable generator shall have listed ground-fault circuit-interrupter protection (GFCI) for personnel integral to the generator or receptacle.
15
Article 411 covers lighting systems and their associated components operating at no more than _____ ac or _____ dc where wet contact is likely to occur
15V, 30V
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
Galvanized steel, stainless steel, and red brass RMC shall be permitted in or under cinder fill subject to permanent moisture, when protected on all sides by a layer of noncinder concrete not less than _____ in. thick.
2
Handholds in poles supporting luminaires shall not be required for poles _____ ft or less in height above finished grade, if the pole is provided with a hinged base.
20
The sum of the cross-sectional areas of all contained conductors and cables at any cross section of a metal wireway shall not exceed _____ percent of the interior cross-sectional area of the wireway.
20
Panelboards equipped with snap switches rated at 30A or less shall have overcurrent protection not exceeding _____.
200A
If a branch circuit supplies a single nonmotor-operated appliance, the rating of overcurrent protection shall not exceed _____ if the overcurrent protection rating is not marked and the appliance is rated 13.30A or less.
20A
For a dual-voltage 230/460V motor, the field windings are connected in parallel for _____ operation and in series for _____ operation.
230V, 460V
Conductor adjustment factors shall not apply to conductors in raceways having a length not exceeding _____ in.
24
The maximum rating or setting of an inverse time breaker used as the motor branch-circuit short-circuit and ground-fault protective device for a single-phase motor is _____ percent of the full-load current given in Table 430.248.
250
What is the voltage drop of each ungrounded conductor of a 4-wire multiwire circuit? Each conductor is 12 AWG, 100 ft in length, supplying a 16A load. The resistance of 12 AWG conductors is 2 ohms per 1,000 ft.
3.20V
What is the approximate output of a 5 hp, 480V, three-phase motor?
3.75 kW
For permanently connected appliances rated at not over _____ or 1/8 hp, the branch-circuit overcurrent device shall be permitted to serve as the disconnecting means where the switch or circuit breaker is within sight from the appliance or is lockable in accordance with 110.25.
300 VA
Receptacles shall not be grouped or ganged in enclosures unless the voltage between adjacent devices does not exceed _____.
300V
Article 411 covers lighting systems and their associated components operating at no more than _____ ac or _____ dc.
30V, 60V
Where flexible cords are used in ambient temperatures other than _____ the temperature correction factors from Table 310.15(B)(2)(a) shall be applied to the ampacity in Table 400.5(A)(1) and Table 400.5(A)(2).
30ºC
The reading of V4 is _____. See Figure.
3V
The length of the cord for a trash compactor shall not be longer than _____ ft, measured from the face of the attachment plug to the plane of the rear of the appliance.
4
Step-down substations reduce the voltage from the high-voltage transmission lines to a primary distribution voltage of _____.
4 kV to 35 kV
FMC supported by openings through framing members at intervals not greater than ____ft and securely fastened within ____in of termination points shall be permitted.
4.5, 12
Enclosures for switches or overcurrent devices are allowed to have conductors feeding through where the wiring space at any cross section is not filled to more than _____ percent of the cross-sectional area of the space.
40
What size motor, in horsepower, is required to produce 30 kW of output?
40 hp
Overcurrent protection for motor control circuits shall not exceed _____ percent if the conductor is based on Table 310.15(B)(17) and does not extend beyond the motor control equipment enclosure.
400
If Bell 2 consumes 12W of power when supplied by two 12V batteries (connected in series), the resistance of this bell is _____. See Figure.
48 ohms
In industrial establishments where conditions of maintenance and supervision ensure that only qualified persons service the installation, flexible cords and flexible cables can be installed in aboveground raceways that are no longer than _____ ft, to protect the flexible cord or flexible cable from physical damage.
50
The total marked rating of a cord-and-plug-connected room air conditioner, connected to the same branch circuit which supplies lighting units, other appliances, or general-use receptacles, shall not exceed _____ percent of the branch-circuit rating.
50
All appliances operating at _____ or more shall be listed.
50V
Conductors located above an electric space-heated ceiling are considered to be operating in an ambient temperature of _____.
50º C
Armored cable used to connect recessed luminaires or equipment within an accessible ceiling can be unsupported and unsecured for lengths up to _____ ft.
6
How many 16 AWG THWN conducotrs can fit in trade size 3/8 FMC with the fittings on the outside?
6
In clothes closets, recessed incandescent or LED luminaires with a completely enclosed light source can be installed in the wall or the ceiling, provided there is a minimum clearance of _____ in. between the luminaire and the nearest point of a storage space.
6
Rigid metal conduit that is directly buried outdoors shall have at least _____ in. of cover.
6
Type MC cable installed horizontally through wooden or metal framing members are considered secured and supported where such support does not exceed _____-ft intervals.
6
Type MC cable shall be secured at intervals not exceeding _____ ft
6
When Type AC cable is run across the top of a floor joist in an attic without permanent ladders or stairs, guard strips within _____ ft of the scuttle hole or attic entrance shall protect the cable.
6
When a motor starts, the current drawn is at least _____ times the motor FLA; this is known as motor "locked-rotor amperes" (LRA).
6
The length of the cord for a built-in dishwasher shall not be longer than _____ ft, measured from the face of the attachment plug to the plane of the rear of the appliance.
6.5
If cables meeting the requirements in 310.15(B)(3)(4)a through c with more than 20 current-carrying conductors are installed longer than 24 in. without maintaining spacing, are stacked, or are supported on bridle rings, a _____ percent adjustment factor shall be applied.
60
Where conductors are installed in raceways or cables exposed to direct sunlight on or above rooftops, a temperature adder of _____º F shall be added to the outdoor temperature where the conduits are less than 7/8 in. from the rooftop.
60
What's the voltage drop across R1, if R1 is equal to 5 ohms and the total resistance of R2, R3, and R4 is 5 ohms? See Figure.
60V
The ampacity of Type UF cable shall be that of _____ conductors in accordance with 310.15.
60º C
Type AC cable installed in thermal insulation shall have conductors that are rated at 90º C. The ampacity of the cable in this application shall not exceed that of a _____ rated conductor.
60º C
Where raceways or cables are exposed to direct sunlight on or above rooftops, raceways or cables shall be installed a minimum distance of _____ in. above the roof to the bottom of the raceway or cable.
7/8
No parts of cord-connected luminaires, chain-, cable-, or cord-suspended luminaires, lighting track, pendants, or paddle fans shall be located within a zone measured 3 ft horizontally and _____ ft vertically from the top of the bathtub rim or shower stall threshold.
8
The minimum clearance between the heating elements of electric space-heating cables installed in ceilings and outlet boxes and junction boxes used for mounting surface luminaires shall not be less than _____ in.
8
The minimum radius of a field bend on trade size 1 1/4 RMC is _____ in.
8
When Type NM cable is used with nonmetallic boxes not larger than 2 1/4 x 4 in., securing the cable to the box shall not be required if the cable is fastened within _____ in. of that box.
8
For stationary motors of 2 hp or less and 300V or less on ac circuits, the controller can be an ac-rated only general-use snap switch where the motor full-load current rating is not more than _____ percent of the rating of the switch.
80
Where six current-carrying conductors are run in the same conduit or cable, the ampacity of each conductor shall be lowered to _____ percent of its ampacity.
80
In the Figure, the total current of the circuit can be measured by ammeter _____.
A3
The total current of the circuit shown in the Figure can be read on _____.
Ammeter 1 Ammeter 2 Ammeter 3 all of these
_____ connectors shall not be concealed when used in installations of LFMC.
Angle
Panelboards supplied by a three-phase, 4-wire, delta-connected system shall have the phase with higher voltage-to-ground (high-leg) connected to the _____ phase.
B
The number of conductors permitted in ENT shall not exceed the percentage fill specified in _____.
Chapter 9, Table 1
_____ is an unthreaded thinwall raceway of circular cross section designed for the routing and physical protection of electrical conductors and cables when joined together with listed fittings.
EMT
FMC shall be permitted to be used in____locations.
Exposed Concealed a and b
Placing a load on a shunt-wound dc motor causes the motor to slow down, which increases the rate at which the field flux lines are cut by the armature. As a result, the armature CEMF increases producing an increase in the applied armature voltage and current. The increase in current results in increased motor speed.
False
The label required for switchboards, switchgear, and panelboards [408.4(B)] shall be permanently affixed, of sufficient durability to withstand the environment involved, and handwritten.
False
The neutral conductor of a 4-wire, 120/208V or 277/480V, three-phase system has neutral current flow when the ungrounded conductors are equally loaded.
False
The power consumed in a series circuit is equal to the power consumed by the largest resistance in the series circuit.
False
There can never be variations in the formulas used or the order in which they are used for series circuits.
False
Type NM cable can be installed as open runs in dropped or suspended ceilings in other than one- and two-family and multifamily dwellings.
False
Type NM cables shall not be used in one- and two-family dwellings exceeding three floors above grade.
False
Type UF cable can be used for service conductors.
False
When installed under metal-corrugated sheet roof decking, the rules for spacing from roof decking apply equally to rigid metal conduit and intermediate metal conduit.
False
When power supplies are connected in series, the circuit voltage remains the same as when only one power supply is connected to it, provided that all the polarities are connected properly.
False
Receptacle assemblies and _____ receptacle assemblies listed for work surface or countertop applications shall be permitted to be installed in work surfaces.
GFCI
Replacement luminaires are not required to be connected to an equipment grounding conductor if no equipment grounding conductor exists at the outlet box and the luminaire is _____.
GFCI protected
When replacing receptacles in locations that would require GFCI protection under the current NEC, _____ receptacles shall be installed.
GFCI-protected
_____ breakers operate on the principle of electromagnetism only and are used for very large motors.
Instantaneous trip
_____ breakers operate on the principle that as the current increases, the time it takes for the device to open decreases.
Inverse time
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
_____ is a raceway of circular cross section having an outer liquidtight, nonmetallic, sunlight-resistant jacket over an inner flexible metal core.
LFMC
If the rotating part of the motor winding is jammed so that it cannot rotate, no CEMF is produced in the motor winding. As a result, the motor operates at _____ and the windings will be destroyed by excessive heat.
LRC
Type _____ cable is a factory assembly of insulated circuit conductors within an armor of interlocking metal tape, or a smooth or corrugated metallic sheath.
MC
Metal raceways shall be bonded to the metal pole with a(n) _____.
Metal raceways shall be bonded to the metal pole with a(n) _____.
For general motor applications, the motor branch-circuit short-circuit and ground-fault protection device shall be sized based on the _____ values.
NEC Table
Type _____ cable is a factory assembly that encloses two or more insulated conductors within a nonmetallic jacket.
NM
Type _____ cable is an assembly primarily used for services.
SE
Type _____ cable is a factory assembly of two or more insulated conductors, with or without associated bare of covered grounding conductors, under a nonmetallic jacket.
TC
A parallel circuit has two or more paths in which current may flow.
True
According to Kirchoff's Current Law, the total current provided by the source to a parallel circuit equals the sum of the currents of all of the branches.
True
Article 440 applies to electric motor-driven air-conditioning and refrigerating equipment that has a hermetic refrigerant motor-compressor.
True
Article 445 contains installation and other requirements for generators.
True
GFCI protection for 15 kW or smaller portable generators shall not be required where the 125V receptacle outlets(s) is interlocked such that it is not available for use when any 125/250V receptacle(s) is in use.
True
If the ungrounded conductors of a multiwire circuit are not terminated to different phases, this can cause the neutral current to exceed the grounded conductor rating.
True
If you know the current of the circuit and the resistance of each resistor, the power of each resistor can be determined by the formula P = I2 x R.
True
In a parallel circuit, the voltage drop across each resistance is equal to the sum of the voltage drops of each of the resistors in parallel.
True
In an ac induction motor, the stator produces a rotating magnetic field that induces current in the rotor windings. The rotor current generates a magnetic field in opposition to the magnetic field of the stator, thereby causing the rotor to turn.
True
PVC conduit can support nonmetallic conduit bodies not larger than the largest trade size of an entering raceway, but the conduit bodies shall not contain devices, luminaires, or other equipment.
True
Receptacles mounted to and supported by a cover shall be secured by more than one screw unless listed and identified for securing by a single screw.
True
Resistance opposes the flow of electrons. In a series circuit, the total circuit resistance is equal to the sum of all of the resistances in series.
True
Section 590.6(A)(3) provides the GFCI requirements for 15 kW or smaller portable generators used for temporary electric power and lighting.
True
The neutral conductor of a 3-wire, 120/240V, single-phase circuit only carries current when the current on the ungrounded conductors is not identical.
True
The opening time for a protection device is inversely proportional to the magnitude of the current. The greater the current value, the less time it takes for the protection device to open.
True
The opposition to current flow results in a voltage drop of the circuit voltage.
True
The total power consumed in a parallel circuit equals the sum of the power of all branches.
True
Threadless couplings and connectors used on threaded IMC ends shall be listed for the purpose.
True
To calculate the total resistance of the circuit: RT = R1 + R2 + R3 +
True
To determine the resistance of each resistive element in the circuit, use the formula R = E2/P. E is the rated voltage of the resistor, and P is the rated power of the resistor.
True
Trade size 1 IMC run straight with threaded couplings shall be supported at intervals not exceeding 12 ft.
True
Where conductors in parallel are run in separate raceways, the raceways shall have the same electrical characteristics.
True
Where one or more internal cable clamps are present in the box, a single volume allowance in accordance with Table 314.16(B) shall be made based on the largest conductor present in the box.
True
Type _____ cable is a factory assembly of conductors with an overall covering of nonmetallic material suitable for direct burial in the earth.
UF
Type _____ cable is a multiconductor assembly identified for use as underground service-entrance cable.
USE
_____ motors are fractional horsepower motors that operate equally well on ac and dc and are used for vacuum cleaners, electric drills, mixers, and light household appliances.
Universal
Type _____ insulated conductors shall not be subject to the ampacity adjustment provisions of 310.15(B)(3)(c).
XHHW-2
Where IMC enters a box, fitting, or other enclosure, _____ shall be provided to protect the wire from abrasion unless the design of the box, fitting, or enclosure affords equivalent protection.
a bushing
Where RMC enters a box, fitting, or other enclosure, _____ shall be provided to protect the wire from abrasion, unless the design of the box, fitting, or enclosure affords equivalent protection.
a bushing
An attachment plug and receptacle can serve as the disconnecting means for a single-phase room air conditioner rated 250V or less if _____.
a or b
Disconnecting means for air-conditioning or refrigerating equipment can be installed _____ the air-conditioning or refrigerating equipment, but not on panels that are designed to allow access to the equipment, and not over the equipment nameplate.
a or b
Electric space-heating cables shall not be installed _____ walls.
a or b
Lampholders installed in damp locations shall be listed for use in _____ locations.
a or b
Luminaires using a _____ lamp, that is subject to physical damage and installed in playing and spectator seating areas of indoor sports, mixed-use, or all-purpose facilities, shall be of the type that protects the lamp with a glass or plastic lens.
a or b
Metal wireways are sheet metal troughs with _____ for housing and protecting electric conductors and cable.
a or b
To reverse the rotation of a dc motor, you must reverse the _____.
a or b
All conductors of the same circuit shall be _____, unless otherwise specifically permitted in the Code.
a or b in the same raceway or cable in close proximity in the same trench
Where exposed to sunlight, nonmetallic raceways, cable trays, boxes, cables with a nonmetallic outer jacket, fittings, and support hardware shall be _____.
a or b listed as sunlight resistant identified as sunlight resistant
Where Type NM cables pass through cut or drilled slots or holes in metal members, the cable shall be protected by _____ which are installed in the opening prior to the installation of the cable and which securely cover all metal edges.
a or blisted bushings listed grommets
The electric utility grounds the primary and secondary neutral conductor to the earth at multiple locations for the purpose of reducing the _____ of the return current path.
ac resistance
For cord-and-plug-(or attachment fitting-) connected appliances, a(n) _____ plug (or attachment fitting) and receptacle combination shall be per-mitted to serve as the disconnecting means.
accessible
For cord-and-plug-connected household electric ranges, an attachment plug and receptacle connection at the rear base of the range can serve as the disconnecting means, if it is _____ and meets the intent of 422.33(A).
accessible from the front by the removal of a drawer
The receptacle for a built-in dishwasher shall be located _____ occupied by the dishwasher.
adjacent to the space
Where more than two Type NM cables are installed through the same opening in wood framing that is to be sealed with thermal insulation, caulk, or sealing foam, the allowable ampacity of each conductor shall be _____.
adjusted in accordance with Table 310.15(B)(3)(a)
Cables or raceways installed using directional boring equipment shall be _____ for this purpose.
approved
IMC, elbows, couplings, and fittings shall be permitted to be installed in concrete, in direct contact with the earth, or in areas subject to severe corrosive influences where protected by corrosion protection _____
approved
The voltmeters shown in the Figure are connected _____ each of the loads.
b and c
A 2-wire, 120V circuit, from a 2-wire 220V system, contains
b and c a grounded conductor ungrounded conductors
Bends in LFNC shall _____ between pull points.
be limited to 360º
Bends in PVC conduit shall _____ between pull points.
be limited to 360º
Type MC cable shall be listed and fittings used for connecting Type MC cable to boxes, cabinets, or other equipment shall _____.
be listed and identified for such use
Where attachment to an equipment grounding conductor does not exist in the receptacle enclosure, a non-grounding-type receptacle shall be permitted to be replaced with a GFCI-type receptacle; however, some equipment or appliance manufacturers require that the _____ to the equipment or appliance includes an equipment grounding conductor.
branch circuit
Type SE cable shall be permitted to be used as _____ in wiring systems where all of the circuit conductors of the cable are of the thermoset or thermoplastic type.
branch circuits feeders Correct Answer a or b
Fixture wires are used to connect luminaires to the _____ conductors supplying the luminaires.
branch-circuit
Exposed runs of cable, except as provided in 300.11(A), shall closely follow the surface of the _____.
building finish running boards Correct Answer a or b
Type AC cable is permitted in _____.
cable trays exposed installations
Openings in cabinets, cutout boxes, and meter socket enclosures through which conductors enter shall be _____.
closed in an approved manner
LFMC shall not be required to be secured or supported where fished between access points through _____ spaces in finished buildings or struc-tures and supporting is impractical.
concealed
Unbroken lengths of electric nonmetallic tubing shall not be required to be secured where fished between access points for _____ work in finished buildings or structures and securing is impractical.
concealed
Threadless couplings and connectors used with RMC buried in masonry or concrete shall be the _____ type.
concrete tight
Switches controlling line-to-neutral lighting loads shall have a grounded conductor provided at the switch location unless the _____.
conductors enter the device box through a raceway that has sufficient area to accommodate a grounded conductor box enclosing the switch is accessible for the installation of an additional or replacement cable without removing finish materials A or B
Fixed electric space-heating equipment and motors shall be considered a _____ load for branch-circuit sizing.
continuous
Article 410 covers luminaires, portable luminaires, lampholders, pendants, incandescent filament lamps, arc lamps, electric-discharge lamps, and _____, and the wiring and equipment forming part of such products and lighting installations.
decorative lighting products lighting accessories for temporary seasonal and holiday use portable flexible lighting products all of these
A switchboard, switchgear, or panelboard containing a 4-wire, _____ system where the midpoint of one phase winding is grounded, shall be legi-bly and permanently field-marked to caution that one phase has a higher voltage-to-ground.
delta-connected
Type MC Cable listed for _____ is permitted to be installed underground under a building without installation in a raceway.
direct burial
The use of LFMC shall be permitted for _____.
direct burial where listed and marked for the purpose exposed work concealed work Correct! all of these
LFNC shall be permitted for _____.
direct burial where listed and marked for the purpose exposed work outdoors where listed and marked for this purpose Correct! all of these
A device or utilization equipment wider than a single 2 in. device box shall have _____ volume allowances provided for each gang required for mounting.
double
Raceways or cable trays containing electric conductors shall not contain any pipe or tube for steam, water, air, gas, drainage, or any service other than _____.
electrical
Direct-buried conductors, cables, or raceways, which are subject to movement by settlement or frost, shall be arranged to prevent damage to the _____ or to equipment connected to the raceways.
enclosed conductors
Conductors of ac and dc circuits, rated 1,000V or less, shall be permitted to occupy the same _____ provided that all conductors have an insulation rating equal to the maximum voltage applied to any conductor.
enclosure cable raceway any of these
The total resistance of a parallel circuit can be calculated by the _____ method.
equal resistance product-over-sum reciprocal Correct! any of these
A flexible cord conductor intended to be used as a(n) _____ conductor shall have a continuous identifying marker readily distinguishing it from the other conductor or conductors. One means of identification is a braid finished to show a continuous green color or a green color with one or more yellow stripes on one conductor.
equipment grounding
Type SE cables shall be permitted to be used for branch circuits or feeders where the insulated conductors are used for circuit wiring and the uninsulated conductor is used only for _____ purposes.
equipment grounding
When LFMC is used to connect equipment where flexibility is necessary to minimize the transmission of vibration from equipment or for equipment requiring movement after installation, a(n) _____ conductor shall be installed.
equipment grounding
Where multimotor and combination-load equipment for air-conditioning and refrigeration is installed outdoors on a roof, a(n) _____ conductor of the wire type shall be installed in outdoor portions of metallic raceway systems that use non-threaded fittings.
equipment grounding
Nonmetallic boxes for switches shall be installed with a wiring method that provides or includes a(n) _____.
equipment grounding conductor
When LFNC is used, and equipment grounding is required, a separate _____ shall be installed in the conduit.
equipment grounding conductor
In installations within walls or ceilings constructed of wood or other combustible surface material, boxes, plaster rings, extension rings, or listed extenders shall _____.
extend to the finished surface project from the finished surface Correct Answer a or b
Snap switches installed in boxes that are set back of the finished surface shall have the _____ seated against the finished wall surface.
extension plaster ears
A 115/230V rated motor connected to a 230V circuit must have the windings connected in series so that each winding will receive at least 230V.
false
Conductors larger than that for which the metal wireway is designed can be installed in any metal wireway.
false
FMC larger than metric designator 129 ( trade size 5) shall ot be used.
false
Nonmetallic-sheathed cable shall be permitted to be unsupported where the cable is _____.
fished between access points through concealed spaces in finished buildings or structures and supporting is impracticable not more than 4 1/2 ft from the last point of cable support to the point of connection to a luminaire or other piece of electrical equipment and the cable and point of connection are within an accessible ceiling in one-, two-, or multifamily dwellings Correct Answer a and b
Type MC cable can be unsupported and unsecured where the cable is _____.
fished between concealed access points in finished buildings or structures and support is impracticable/not more than 6 ft from the last point of support within an accessible ceiling for the connection of luminaires or other electrical equipment A or C
Where raceways or cables enter above the level of uninsulated live parts of cabinets, cutout boxes, and meter socket enclosures in a wet location, a(n) _____ shall be used.
fitting listed for wet locations
The radius of the curve of the inner edge of any bend, during or after installation, shall not be less than _____ times the diameter of Types USE or SE cable.
five
The radius of the curve of the inner edge of any bend shall not be less than _____ for Type AC cable.
five times the diameter of the cable
Flexible cord sets and power-supply cords shall not be used as a substitute for _____ wiring.
fixed
Receptacles for built-in dishwashers and trash compactors shall be located to protect against physical damage to the _____.
flexible cord
Type TC cable can be used _____.
for power, lighting, control, and signal circuits in cable trays including those with mechanically discontinuous segments up to 1 ft for Class 1 control circuits as permitted in Parts II and III of Article 725
A child care facility is a building or structure, or portion thereof, used for educational, supervision, or personal care services for more than _____ children seven years in age or less.
four
A run of IMC shall not contain more than the equivalent of _____ quarter bend(s) between pull points such as conduit bodies and boxes.
four
A run of RMC shall not contain more than the equivalent of _____ quarter bend(s) between pull points such as conduit bodies and boxes.
four
Horizontal runs of RMC supported by openings through _____ at intervals not exceeding 10 ft and securely fastened within 3 ft of termination points shall be permitted.
framing members
In determining the highest rated motor for purposes of complying with 430.24, 430.53(B), 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
Where practicable, contact of dissimilar metals shall be avoided in an IMC raceway installation to prevent the possibility of _____.
galvanic action
For the purposes of determining box fill, each device or utilization equipment in the box which is wider than a single device box counts as two conductors for each _____ required for the mounting.
gang
To remove dangerous touch voltage on metal parts from a(n) _____, the fault-current path must have low impedance to allow the fault current to quickly rise to facilitate the opening of the protection device.
ground fault
Each _____ conductor shall terminate within the panelboard at an individual terminal that is not used for another conductor.
grounded
Metal faceplates for snap switches, including dimmer and similar control switches, shall be _____.
grounded
Where a grounding means exists in the receptacle enclosure a(n) _____-type receptacle shall be used.
grounding
Electric space-heating cables shall not be installed over cabinets whose clearance from the ceiling is less than the minimum _____ dimension of the cabinet to the nearest cabinet edge that is open to the room or area.
horizontal
Spare or unused raceways shall be sealed with sealants _____ for use with the cable insulation, conductor insulation, bare conductor, shield, or other components.
identified
Type TC cable shall be permitted to be direct buried, where _____ for such use.
identified
Unused openings for circuit breakers and switches in switchboards and panelboards shall be closed using _____, or other approved means that provide protection substantially equivalent to the wall of the enclosure.
identified closures
Where used to securely fasten LFMC, cable ties shall be _____ for securement and support.
identified listed Correct! a and c
Metal wireways can pass transversely through a wall _____.
if the length passing through the wall is unbroken
Type UF cable shall not be used _____.
in any hazardous (classified) location except as otherwise permitted in this Code embedded in poured cement, concrete, or aggregate where exposed to direct rays of the sun, unless identified as sunlight resistant Correct Answer all of these
Where flexibility _____, liquidtight flexible metal conduit shall be permitted to be used as an equipment grounding conductor when installed in accordance with 250.118(6).
is not required after installation
Flexible cords and flexible cables shall be connected to fittings so that tension will not be transmitted to joints or terminals by _____.
knotting the cord winding the cord with tape fittings designed for the purpose any of thes
The voltage drop over a conductor is directly proportional to the _____ of the conductor.
length
Parallel conductors shall have the same _____.
length material size in circular mil area all of these
Cable ties used to secure and support LFNC shall be _____ as suitable for the application and for securing and supporting.
listed
labeledFor the purposes of 350.30, _____ LFMC fittings shall be permitted as a means of securement and support.
listed
A 125V 15A or 20A receptacle that additionally provides Class 2 power shall be _____ such that the Class 2 circuitry is integral with the receptacle [406.3(F)].
listed constructed a and b
Type MC cable shall be supported and secured by staples; cable ties _____ for securement and support; straps, hangers, or similar fittings; or other approved means designed and installed so as not to damage the cable.
listed identified Correct Answer a and b
Threadless couplings and connectors used with RMC in wet locations shall be _____.
listed for wet locations
Threadless couplings approved for use with IMC in wet locations shall be _____.
listed for wet locations
An in-sink waste disposer can be cord-and-plug-connected, but receptacles shall be _____ to protect against physical damage to the flexible cord.
located
Metal parts of the electric utility equipment are bonded to the utility neutral to provide a _____ path to the power source to assist in clearing a line-to-case fault.
low-impedance
The motor controller shall have horsepower ratings at the application voltage not _____ the horsepower rating of the motor.
lower than
Ferrous 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 severe corrosive influences, where _____ approved for the condition.
made of material
Coves for luminaires shall be located so that the lamps and equipment can be properly installed and _____.
maintained
Bends in LFNC shall be made so that the conduit will not be damaged and the internal diameter of the conduit will not be effectively reduced. Bends can be made _____.
manually without auxiliary equipment
Insulated conductors used in wet locations shall be _____.
moisture-impervious metal-sheathed MTW, RHW, RHW-2, TW, THW, THW-2, THHW, THWN, THWN-2, XHHW, XHHW-2, or ZW listed for wet locations any of these
Type UF cable shall not be used in _____.
motion picture studios storage battery rooms hoistways Correct Answer all of these
Each generator shall be provided with a _____ listing the manufacturer's name, the rated frequency, power factor, number of phases (if alter-nating current), and its rating in kilowatts or kilovolt-amperes.
nameplate
A unit switch with a marked "_____" position that is part of a fixed space heater, and disconnects all ungrounded conductors, shall be permitted to serve as the required disconnecting means.
off
Nonmetallic boxes can be used with _____.
nonmetallic sheaths nonmetallic raceways flexible cords Correct Answer all of these
HPD cord shall be permitted for _____.
not hard usage
When EMT is installed in wet locations, all supports, bolts, straps, and screws shall be _____.
of corrosion-resistant materials protected against corrosion by corrosion-resistant materials Correct Answer a or b
Where a box is provided with _____ or more securely installed barriers, the volume shall be apportioned to each of the resulting spaces; each barrier, if not marked with its volume, shall be considered to take up 1/2 cu in. if metal, and 1 cu in. if nonmetallic.
one
Where insulated conductors are deflected within a metal wireway, the wireway shall be sized to meet the bending requirements corresponding to _____ wire per terminal in Table 312.6(A).
one
Where correction or adjustment factors are required by 310.15(B)(2) or (3), for single-phase feeder conductors installed for _____ dwellings, they shall be permitted to be applied to the ampacity associated with the temperature rating of the conductor.
one-family the individual dwelling units of two-family the individual dwelling units of multifamily all of these
A switchboard or panelboard containing an ungrounded ac electrical system is required to be legibly and permanently field marked to caution that the system is ungrounded and include the _____.
operating voltage between conductors
Electric space-heating cables shall be permitted to extend beyond the room or area in which they _____.
originate
All switchboards, switchgear, and panelboards supplied by a feeder(s) in _____ shall be permanently marked to indicate each device or equipment where the power supply originates.
other than one- or two-family dwellings
A panelboard shall be provided with physical means to prevent the installation of more _____ devices than that number for which the panelboard was designed, rated, and listed.
overcurrent
The purpose of overcurrent protection is to protect conductors and equipment against excessive or dangerous temperatures because of overcurrent. Overcurrent is current in excess of the rated current of equipment or conductors. It may result from a(n) _____.
overload
A single-phase, dual-rated, 120/240V motor will have its winding connected in _____ when supplied by 120V.
parallel
If the supply voltage is 120V, the total energy consumed for four 10-ohm resistors will be more if all of the resistors are connected in _____.
parallel
In general, when multiple light bulbs are wired in a single luminaire, they're connected in _____ to each other.
parallel
The wiring space of enclosures for switches or overcurrent devices shall be permitted to contain power monitoring equipment where the _____.
power monitoring equipment is identified as a field installable accessory as part of the listed equipment, or is a listed kit evaluated for field installation in switch or overcurrent device enclosures total area of all conductors, splices, taps, and equipment at any cross section of the wiring space does not exceed 75 percent of the cross-sectional area of that space Correct Answer a and b
Because of the earth's high resistance to current flow, it cannot be used for the purpose of clearing a line-to-case ground fault for _____ wiring.
premises
Materials such as straps, bolts, and so forth, associated with the installation of RMC in wet locations shall be _____.
protected against corrosion by corrosion-resistant materials corrosion resistant Correct Answer b or c
A snap switch that does not have means for connection to an equipment grounding conductor shall be permitted for replacement purposes only where the wiring method does not include an equipment grounding conductor and the switch is _____.
provided with a faceplate of nonconducting, noncombustible material with nonmetallic screws GFCI protected a or b
Luminaires designed for end-to-end assembly, or luminaires connected together by _____, can contain a 2-wire branch circuit, or one multiwire branch circuit, supplying the connected luminaires. One additional 2-wire branch circuit separately supplying one or more of the connected lumi-naires is permitted.
recognized wiring methods
The _____ of an ac generator contains the electromagnetic field, which cuts through the stationary conductor coils.
rotor
Flexible cord sets and power-supply cords shall not be used where they are _____.
run through holes in walls, ceilings, or floors run through doorways, windows, or similar openings attached to building surfaces, unless permitted by 368.56(B) all of these
Plug-in-type back-fed circuit breakers used to terminate field-installed ungrounded supply conductors shall be _____ by an additional fastener that requires more than a pull to release.
secured in place
Each cable entering a cutout box _____.
shall be secured to the cutout box
A _____ is a circuit that contains some resistances in series and some resistances in parallel with each other.
series-parallel circuit
Bends made in interlocked or corrugated sheath Type MC cable shall have a radius of at least _____ times the external diameter of the metallic sheath.
seven
Aluminum fittings and enclosures shall be permitted to be used with galvanized steel RMC, and galvanized steel fittings and enclosures shall be permitted to be used with aluminum RMC where not subject to _____.
severe corrosive influences
A luminaire marked "Suitable for Wet Locations" _____ be permitted to be used in a damp location.
shall
Duct heater controller equipment shall have a disconnecting means installed within _____ the controller except as allowed by 424.19(A).
sight from
Series circuits are often used for _____ applications.
signal control a and b
Switches or circuit breakers shall not disconnect the grounded conductor of a circuit unless the switch or circuit breaker _____.
simultaneously disconnects all conductors of the circuit
Short-radius conduit bodies such as capped elbows and service-entrance elbows that enclose conductors 6 AWG or smaller shall not contain _____.
splices taps devices Correct Answer any of these
The _____ rating of a conductor is the maximum temperature, at any location along its length, which the conductor can withstand over a prolonged period of time without serious degradation.
temperature
Smooth-sheath Type MC cable with an external diameter not greater than 3/4 in. shall have a bending radius not more than _____ times the cable external diameter.
ten
When separate equipment grounding conductors are provided in panelboards, a _____ shall be secured inside the cabinet.
terminal bar
Snap switches in listed assemblies are not required to be connected to an equipment grounding conductor if _____.
the device is provided with a nonmetallic faceplate that cannot be installed on any other type of device and the device does not have mounting means to accept other configurations of faceplates the device is equipped with a nonmetallic yoke all parts of the device that are accessible after installation of the faceplate are manufactured of nonmetallic material all of these
When bare conductors are installed with insulated conductors, their ampacities shall be limited to _____.
the lowest temperature rating for any of the insulated conductors
Running threads shall not be used on IMC for connection at couplings.
true
Cabinets, cutout boxes, and meter socket enclosures can be used for conductors feeding through, spliced, or tapping off to other enclosures, switches, or overcurrent devices where _____.
the total area of the conductors at any cross section does not exceed 40 percent of the cross-sectional area of that space the total area of conductors, splices, and taps installed at any cross section does not exceed 75 percent of the cross-sectional area of that space a warning label on the enclosure identifies the closest disconnecting means for any feed-through conductors Correct Answer all of these
The _____ sensing element causes the circuit breaker to open when a predetermined calibration temperature is reached.
thermal
Conductors smaller than 1/0 AWG can be connected in parallel to supply control power, provided _____.
they are all contained within the same raceway or cable each parallel conductor has an ampacity sufficient to carry the entire load the circuit overcurrent device rating does not exceed the ampacity of any individual parallel conductor all of these
Unless overload protection is provided by other approved means, the minimum number of overload units required for a three-phase alternating-current motor is _____.
three
EMT couplings and connectors shall be made up _____.
tight
Exposed runs of Type AC cable can be installed on the underside of joists where supported at each joist and located so it is not subject to physical damage.
true
Flat Type NM cables shall not be stapled on edge.
true
Flexible Metal Conduit (FMC) is a raceway of circular cross section made of helically wound, formed, interlocked metal strip.
true
Horizontal runs of IMC supported by openings through framing members at intervals not exceeding 10 ft and securely fastened within 3 ft of terminations shall be permitted.
true
PVC conduit shall be permitted for exposed work where subject to physical damage if identified for such use.
true
Swapping _____ of the line conductors can reverse a three-phase ac motor's rotation.
two
The product-over-sum method is used to calculate the resistance of _____ resistance(s) at a time.
two
When counting the number of conductors in a box, a conductor running through the box with an unbroken loop or coil not less than twice the minimum length required for free conductors shall be counted as _____ conductor(s).
two
Field bends in PVC conduit shall be made only _____.
with bending equipment identified for the purpose
Three-way and four-way switches shall be wired so that all switching is done only in the _____ circuit conductor.
ungrounded
The available short-circuit current is different at each point of the electrical system; it is highest at the _____.
utility transformer
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.
ventilation
The ampacities listed in 310.15 do not take _____ into consideration.
voltage drop
Flexible cords and flexible cables can be used for _____.
wiring of luminaires connection of portable luminaires or appliances connection of utilization equipment to facilitate frequent interchange all of these
Receptacles mounted in boxes set back from the finished surface shall be installed so that the mounting _____ of the receptacle is held rigidly at the finished surface.
yoke or strap