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419.3
Answered +2
A ___ is a type of surface, flush, or freestanding raceway designed to hold conductors and receptacles, assembled in the field or at the factory.
a. wireway
b. busway
c. cable tray
d. multioutlet assembly
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An organization, office, or individual responsible for enforcing the requirements of a code or standard, or for approving equipment, materials, an installation, or a procedure is known as the ___.
a. code official
b. building official
c. authority having jurisdiction
d. none of these
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A clothes closet is described as a(n) ___ room or space intended primarily for storage of garments and apparel.
a. small
b. nonhabitable
c. large
d. individual
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A unit of an electrical system, other than a conductor, that carries or controls electric energy as its principal function is known as a(n) ___.
a. device
b. equipment
c. panelboard
d. switchboard
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When the code specifies that one equipment shall be “in sight from”, “within sight from”, or “within sight of”, the equipment must be visible and not more than ___ away.
a. 10 feet
b. 20 feet
c. 25 feet
d. 50 feet
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A lighting outlet is an outlet intended for the direct connection of a lampholder or ___.
a. luminaire
b. light
c. light fixture
d. illumination
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An enclosed channel designed expressly for holding wires, cables, or busbar is a(n) ___.
a. cable
b. conduit
c. raceway
d. wiring method
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A branch circuit that supplies only one utilization equipment is a(n) ___ branch circuit.
a. individual
b. appliance
c. equipment
d. general purpose
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Service conductors are the conductors from the service point to the ___.
a. service drop
b. service lateral
c. service disconnecting means
d. service head
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Covered, shielded, fenced, enclosed, or otherwise protected by means of suitable covers, casings, barriers, rails, screens, mats, or platforms to remove the likelihood of approach or contact by persons or objects to a point of danger is the def nition of ___.
a. shielded
b. protected
c. guarded
d. inaccessible
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A premises wiring system whose power is derived from a source of electric energy or equipment other than a service def nes a ___. Some examples of this may include a generator, a battery, converter windings, a transformer, and a solar photovoltaic system, provided they have no direct electrical connection to
supply conductors originating in another system.
a. service
b. service lateral
c. service drop
d. separately derived system
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A ___ is used to connect the grounding electrode to the equipment or to the grounded conductor at the service equipment.
a. grounded conductor
b. grounding electrode conductor
c. main bonding jumper
d. main breaker
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A(n) ___ branch circuit consists of two or more ungrounded conductors that have a voltage between them, and a grounded conductor that has equal voltage between it and each ungrounded conductor of the circuit and that is connected to the neutral or grounded conductor of the system.
a. multiwire
b. multioutlet
c. assembled
d. nominal
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Equipment intended to interrupt current at fault levels shall have an interrupting rating at nominal circuit voltage sufficient for the current that is available ___.
a. at the line terminals of the equipment
b. at the output terminals of the power source
c. both a and b
d. neither a nor b
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Unless identified for use in the operating environment, no conductors or equipment shall be located in ___ having a deteriorating effect on the conductors or equipment.
I. damp or wet locations
II. where exposed to gases, fumes, vapors, liquids, or other agents
a. I only
b. II only
c. both I and II
d. neither I nor II
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Electric equipment shall be installed in a neat and ___ manner.
a. efficient
b. safe
c. workmanlike
d. orderly
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The minimum depth of working space for a 240/120-volt, three-phase panelboard mounted on one wall (with exposed live parts) and another 240/120-volt, three-phase panelboard on the opposite wall (with exposed live parts), shall be at least ___ feet.
a. 3
b. 3 1/2
c. 4
d. 2 1/2
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The required minimum working space for a 120/240-volt, single-phase service panel when grounded parts are opposite the panel is ___.
a. 3 1/2 ft.
b. 2 1/2 ft.
c. 3 ft.
d. 4 ft.
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The width of the working space in front of the electric equipment shall be the width of the equipment or ___ inches, whichever is greater.
a. 36
b. 42
c. 40
d. 30
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Given: You have a surface mounted wireway installed below a surface mounted panelboard. The wireway and the panelboard are connected together by means of conduit nipples. The wireway shall be permitted to extend not more than ___ in. beyond the front of the panelboard.
a. 0
b. 4
c. 6
d. 12
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The minimum headroom of working spaces about service equipment, switchboards, panelboards, or motor control centers shall be ___.
a. 6′-0″
b. 6′-6″
c. 6′-7″
d. 7′-2″
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Entrances to rooms and other guarded locations containing exposed live parts shall be marked with ___ warning signs forbidding unqualif ed persons to enter.
a. yellow
b. blue
c. conspicuous
d. orange
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For equipment rated 1200 amperes or more and over 6 feet wide (600 volts or less), containing overcurrent devices, switching devices, or control devices, there shall be one entrance not less than ___ inches wide and 6 1/2 feet high at each end of the working space.
a. 24
b. 30
c. 36
d. 48
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Given: You have a 7-ft. wide switchboard installed in an electrical equipment room. Disregarding exceptions, if the switchboard is rated ___ amperes or more, the equipment room is required to have two entrances.
a. 400
b. 800
c. 1200
d. 1600
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The grounded conductor, when insulated, shall have insulation ___.
I. rated not less than 300 volts for solidly grounded neutral systems of 1 kv and over as described in section 250.184
II. which is suitable, other than color, for any ungrounded conductor of the same circuit on circuits of less than 1000 volts
a. I only
b. II only
c. either I or II
d. neither I nor II
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When two multiwire branch circuits from different systems are installed in the same raceway and the neutral from one system has an outer covering of white, the other circuit’s neutral is permitted to have an outer covering of ___.
I. white with green stripe
II. natural gray
III. white with colored stripe, other than green
a. I only
b. I or II only
c. II only
d. II or III only
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Insulated grounded conductors shall have insulation that is suitable, other than color, for any ungrounded conductor of the same circuit for systems of ___ volts or less.
a. 300
b. 600
c. 750
d. 1,000
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Neutral conductors ___ be used for more than one branch circuit, for more than one multiwire branch circuit, or for more than one set of ungrounded feeder conductors unless specifically permitted.
a. may
b. shall not
c. shall only
d. always
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Which of these methods is allowed for identifying grounded conductors 6 AWG and smaller?
a. gray outer finish
b. white outer finish
c. white outer finish with a tracer thread
d. any of these
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If a cable assembly is used in a 3-way switch loop for a 120V lighting circuit, the white conductor can be reidentified as an ungrounded conductor, but must be the conductor that supplies the ___.
a. luminaire
b. outlet
c. switch
d. any of these
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The grounded conductor terminal for receptacle can be identified by ___.
a. gray paint
b. a gray screw
c. the letter W
d. any of these
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For devices with screw shells, the terminal for the grounded conductor shall be the one connected to the ___.
a. screw shell
b. pin
c. sleeve
d. plug
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The identification of terminals to which a grounded conductor is to be connected shall be substantially ___ in color.
a. brass
b. copper
c. green
d. white
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A duplex receptacle with two circuits on the same yoke is permitted to have ___ as a means of disconnect.
I. two single-pole circuit breakers without tie handles
II. one double-pole circuit breaker
III. two single-pole circuit breakers with tie handles
a. I or II or III
b. II only
c. I or II only
d. II or III only
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All branch circuits that supply 120volt, 15- and 20-ampere outlets installed in dwelling unit ___ shall be protected by an arc-fault circuit interrupter listed to provide protection of the entire branch circuit.
a. garages
b. attics
c. bathrooms
d. bedrooms
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One single receptacle with a 20-ampere rating may be installed on a ___-ampere individual branch circuit.
I. 15 II. 20
a. I only
b. II only
c. either I or II
d. neither I nor II
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A 50-ampere rated single receptacle may be installed on a ___-ampere individual branch circuit.
a. 40
b. 50
c. 40 or 50
d. 60
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Receptacles connected to a 20-amp residential branch circuit are to be rated ___.
I. 15 amperes II. 20 amperes
a. I only
b. II only
c. either I or II
d. neither I nor II
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In a dwelling, a living room branch circuit with a 20-ampere rating can be loaded to a maximum of ___ amperes.
a. 10
b. 15
c. 16
d. 20
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Outdoor receptacles at a dwelling unit are not required to be GFCI-protected if they are supplied from a dedicated branch circuit installed ___.
a. in a weatherproof box
b. at a second-floor level
c. at least 61/2 ft. above grade level
d. for electric snow-melting or de-icing equipment
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A cord connector that is supported by a permanently installed cord pendant shall be considered a(n) ___ outlet.
a. plug
b. receptacle
c. lighting
d. appliance
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In a dwelling, the maximum distance between receptacles is ___ feet.
a. 2
b. 6
c. 10
d. 12
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How many outside receptacles, accessible at grade level, are required for a single-family dwelling?
a. 1
b. 2
c. 3
d. 4
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Switch-controlled receptacles (in lieu of a lighting outlet) are permitted in all except which of the following?
a. kitchen
b. dining room
c. hallway
d. bedroom
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Ground-fault circuit-interrupter protection MUST be provided in residential kitchens for receptacles ___.
a. that serve the countertop surface
b. that also serve the dining room
c. that are on the same circuit as the outdoor receptacles
d. that are beneath the countertop
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For the kitchen small-appliance branch circuit in a dwelling, the Code requires not less than which of the following?
a. two 20-amp circuits
b. one 15-amp circuit
c. two 15-amp circuits
d. one 20-amp circuit
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Receptacles in a kitchen of a residence that are to serve countertop surfaces shall be installed so that no point along the wall line is more than ___ inches, measured horizontally, from a receptacle outlet in that space.
a. 24
b. 18
c. 36
d. 48
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The maximum distance between kitchen countertop receptacles in a one-family dwelling is ___ feet.
a. 2
b. 4
c. 6
d. 12
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A 24"-wide by 5'-long island countertop in a dwelling kitchen shall have receptacles installed ___.
a. so that at least one is provided
b. every 24"
c. only if the owner wants them
d. every 12"
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Residential bathroom receptacle outlets shall be supplied by ___.
I. ground-fault protection for personnel
II. at least one 20-amp branch circuit
a. I only
b. II only
c. both I and II
d. neither I nor II
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Appliance receptacle outlets installed in a dwelling for specific appliances, such as laundry equipment, shall be placed within ___ feet of the intended location of the appliance.
a. 3
b. 5
c. 8
d. 6
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Accessory buildings that have a floor located ___ grade level not intended as habitable rooms and limited to storage or work areas shall have ground-fault circuit-interrupter protection for all 125-volt, 15- and 20-ampere receptacles.
a. below
b. at or below
c. above
d. all of these
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The maximum distance between receptacle outlets in a multifamily dwelling is ___.
a. 2'
b. 6'
c. 4'
d. 12'
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A residence has a front entrance on the north side of the house, an attached garage with an 8'-wide door, and a back entrance door on the south side of the house. How many lighting outlets are required for these outdoor entrances?
a. 1
b. 2
c. 3
d. none of these
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Interior stairway lighting outlets in dwellings shall be controlled by a wall switch at each floor level where the difference between levels is ___ steps or more.
a. 3
b. 6
c. 11
d. 12
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The Code ___ require a lighting outlet in a clothes closet.
a. does
b. does not
c.
d.
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All 125-volt, single-phase, 15- and 20-ampere receptacles installed in bathrooms of ___ shall have ground-fault circuit-interrupter protection for personnel.
a. guest rooms in hotels/motels
b. dwelling units
c. offce buildings
d. all of these
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Branch-circuit conductors that supply a continuous load are required to have an ampacity of not less than ___ percent of the continuous load plus ___ percent of the noncontinuous load.
a. 100, 125
b. 125, 100
c. 100, 100
d. 125, 125
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A single receptacle shall have a rating of ___ percent of the branch-circuit rating.
a. 70
b. 80
c. 100
d. 125
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A cord connector that is supported by a permanently installed cord pendant shall be considered a(n) ___.
a. receptacle outlet
b. permanent cord
c. lighting outlet
d. outlet device
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The space measured horizontally above a show window must have at least one receptacle for each ___ linear feet.
a. 12
b. 10
c. 8
d. 6
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The minimum feeder-circuit conductor size, before the application of any adjustment or correction
factors, shall have an allowable ampacity equal to or greater than the noncontinuous load plus ___
percent of the continuous load.
a. 100
b. 125
c. 80
d. 75
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The minimum size THHN copper neutral conductor permitted for an 8 3/4 kW, 240-volt, 3-wire household electric range is ___ AWG.
a. 10
b. 6
c. 12
d. 8
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One cooktop and two ovens are connected to one branch circuit in a kitchen of a one-family dwelling. The cooktop has a nameplate rating of 4 kW at 240 volts, and each oven has a nameplate rating of 5.5 kW at 240 volts. The minimum load calculation for this branch circuit is ___ watts.
a. 15,000
b. 8,000
c. 11,000
d. 9,000
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Raceways on the outside of a building shall be ___.
a. watertight and arranged to drain
b. weatherproof and covered
c. suitable for use and arranged to drain
d. rainproof and guarded
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The installation of outside wiring on surfaces of buildings shall be permitted for circuits not over 1000 volts, nominal, as ___.
a. flexible metal conduit
b. EMT
c. open wiring on insulators
d. all of these
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Vegetation such as trees shall not be used for support of ___.
a. luminaires
b. brackets or clamps
c. overhead conductor spans
d. any of these
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Outdoor lampholders with terminals of a type that puncture the ___ shall be attached only to conductors of the stranded type.
a. exterior of the building
b. paint
c. insulation
d. none of these
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Communications conductors shall be mounted not less than ___ inches below power conductors rated
over 300 volts supported on poles.
a. 6
b. 10
c. 20
d. 30
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Where more than one building or other structure is on the same property and under single management,
each building or other structure served shall be provided with means for disconnecting all ___ conductors
located nearest the point of entrance of the supply conductors.
I. grounded II. ungrounded
a. I only
b. II only
c. both I & II
d. neither I nor II
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An overhead feeder is to be installed to a residential garage. The conductors are insulated and have a voltage of 120 volts to ground. This circuit does not pass over a sidewalk or driveway. What is the minimum height above the ground that must be maintained?
a. 8 ft.
b. 10 ft.
c. 12 ft.
d. 15 ft.
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Conductors shall be considered outside a building where installed ___.
I. in a raceway
II. within a building in a raceway enclosed by 2″ of brick
III. under not less than 2″ of concrete beneath a building
a. II only
b. III only
c. II & III only
d. I, II & III
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Service entrance cables, where subject to physical damage, shall be protected when installed in ___.
I. EMT II. IMC III. RMC
a. III only
b. II & III only
c. I, II & III
d. I & III only
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Where exposed to the weather, raceways enclosing service-entrance conductors shall be ___.
I. Suitable for use in wet locations II. arranged to drain III. racked
a. I, II & III
b. II & III only
c. I only
d. I & II only
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Where it is impracticable to locate the service head above the point of attachment, the service head
location shall be permitted no further than ___ from the point of attachment.
a. 1′
b. 2′
c. 3′
d. 4′
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A(An) ___ is considered to be service equipment by the NEC
®.
I. individual meter socket enclosure
II. service disconnecting means
III. panelboard
a. I only
b. I & II only
c. II & III only
d. I, II & III
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If the service disconnecting means is located inside a residence, it shall be located ___ the point of entrance of the service conductors.
a. at a point nearest
b. a maximum of 6 ft. from
c. a maximum of 10 ft. from
d. a maximum of 25 ft. from
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A building is provided with two sets of service-drop conductors from the utility pole. One service drop
is 120/240-V for lighting and receptacle loads, and the other service is 480-V to supply motor loads.
How many disconnecting means are permitted for this building?
a. one
b. two
c. six
d. twelve
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Two or three single-pole switches or breakers, capable of individual operation, shall be permitted on
multiwire circuits, one pole for each ungrounded conductor, as one multipole disconnect provided they
are equipped with ___ to disconnect all conductors of the service with no more than six operations of
the hand.
I. a master handle II. identif ed handle ties
a. I only
b. II only
c. either I or II
d. neither I nor II
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In a multiple-occupancy building, each occupant shall have access to its own service ___.
a. conductor
b. disconnecting means
c. cable
d. overcurrent protection
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For a one-family dwelling, the service disconnecting means shall have a rating of not less than ___
amperes, 3-wire.
a. 50
b. 60
c. 100
d. 125
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Where necessary to prevent ___, an automatic overcurrent device protecting service conductors supplying
only a specif c load, such as a water heater, shall be permitted to be locked or sealed where located
so as to be accessible.
a. tripping
b. corrosion
c. heat build up
d. tampering
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Disregarding exceptions, all 3-phase, 277/480-volt, wye electrical services require ground-fault protection
for each service disconnecting means when rated for ___ amps or more.
a. 400
b. 800
c. 1,000
d. 1,500
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Each ___ service conductor shall have overload protection.
a. overhead
b. underground
c. ungrounded
d. none of these
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Service conductors installed as unjacketed multiconductor cable shall have a minimum clearance of ___ feet from doors, porches, f re escapes, windows designed to be opened, and similar equipment.
a. 3
b. 4
c. 6
d. 10
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The minimum clearance above the roof for 120/240-volt service conductors terminating at a through-the-roof raceway when less than 6 feet of the conductors pass over the roof overhang is ___.
a. 12 inches
b. 2 feet
c. 18 inches
d. 3 feet
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The minimum vertical clearance for 208Y/120-volt, three-phase service-drop conductors in a commercial area subject to minimal truck traffc is ___ feet.
a. 8
b. 10
c. 12
e. 18
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Conductor overload protection is not required if ___.
a. conductors are oversized by 125%
b. conductors are part of a limited-energy circuit
c. interruption of the circuit can create a hazard
d. none of these
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Which of the following statements about supplementary overcurrent protection is correct?
a. It shall not be used in luminaires.
b. It shall not be used as a substitute for a branch circuit overcurrent protection device.
c. It may not be used to protect internal circuits of equipment.
d. It shall be readily accessible.
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A current-limiting overcurrent protective device is a device that will ___ the current fowing in the faulted circuit.
a. reduce
b. increase
c. maintain
d. none of these
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The largest standard rating for an inverse time circuit breaker is ___ amperes.
a. 600
b. 1200
c. 6000
d. 8000
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Given: You have tenant spaces in a mall; each occupant shall have access to the main disconnecting means, except where ___.
a. the service and maintenance are provided by the building management
b. there are more than six disconnecting means provided
c. the primary feeder transformer does not exceed 600 volts
d. the secondary of the service transformer does not exceed 240 volts to ground
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Overcurrent devices shall be enclosed in ___.
I. cabinets II. cutout boxes
a. I only
b. II only
c. either I or II
d. neither I nor II
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Plug fuses and fuseholders can be used in circuits supplied by a system having a grounded neutral point and having no conductor at over ___ volts to ground.
a. 115
b. 120
c. 125
d. 150
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Plug fuses of the Edison-base type shall be used ___.
a. where overfusing is necessary
b. only for 50 amps and above
c. as a replacement for type S fuses
d. only as a replacement in existing installations
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Circuit breakers shall be marked with their ampere rating in a manner that will be ___ after installation.
I. accessible II. durable III. visible
a. I only
b. II only
c. I & III only
d. II & III only
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Inverse time circuit breakers that have an interrupting rating other than ___ amperes, shall have the interrupting rating indicated on the breaker.
a. 1,000
b. 5,000
c. 10,000
d. 20,000
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A two-pole circuit breaker that may be used for protecting a 3 phase, corner-grounded delta circuit shall be marked ___.
a. 1Ø, 120/240-V
b. 1Ø 143Ø
c. 1Ø/2Ø/3Ø
d. 480Y/277-V
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Where an equipment bonding jumper is installed on the outside of a raceway, the length shall not exceed ___ feet and shall be routed with the raceway or enclosure.
a. 3
b. 6
c. 10
d. 25
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A(n) ___ shall be used to connect the grounding terminal of a grounding type receptacle to a grounded box.
a. a neutral conductor
b. branch circuit
c. equipment bonding jumper
d. main bonding jumper
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What size copper equipment grounding conductor is required for a circuit having a 40-ampere overcurrent device?
a. 12
b. 8
c. 6
d. 10
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When an electrical service is required to have a grounded conductor present, what is the smallest grounded conductor permitted for an electric service using 1000 kcmil copper ungrounded conductors?
a. 3/0 copper
b. 2/0 copper
c. 1/0 copper
d. 4/0 copper
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A grounding electrode conductor shall not be required for a system that supplies a ___ circuit and is derived from a transformer not more than 1000 VA.
a. Class 1
b. Class 2
c. Class 3
d. all of these
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Given: A metal underground water pipe is used as a grounding electrode and used to bond other electrodes together. The grounding electrode conductor is connected to the water pipe on the interior of the building. The connection of the grounding electrode conductor to the interior water pipe shall be made a maximum of ___ feet from the point where the water pipe enters the building.
a. 3
b. 5
c. 8
d. 10
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A grounding ring encircling the building, in direct contact with the earth, must consist of at least ___ feet of bare copper conductor not smaller than 2 AWG.
a. 8
b. 100
c. 6
d. 20
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Electrodes of steel or iron shall have a diameter of at least ___.
a. 1/2”
b. 3/4”
c. 1”
d. 5/8”
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Where more than one grounding electrode is used, each electrode of one grounding system (including that used for air terminals) shall not be less than ___ feet from any otherelectrode of another grounding system.
a. 6
b. 8
c. 10
d. 20
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A single, made grounding electrode shall have a maximum resistance to ground of ___ ohms.
a. 25
b. 80
c. 100
d. 125
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A single electrode consisting of a ___ which does not have a resistance to ground of 25 ohms or less shall be augmented by one additional electrode.
I. rod II. pipe III. plate
a. I only
b. II only
c. III only
d. I, II or III
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Where used outside, aluminum or copper-clad aluminum grounding conductors shall not be terminated within ___ inches of earth.
a. 24
b. 18
c. 30
d. 36
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A 600-amp main breaker service panelboard is fed with four parallel sets of 1/0 kcmil copper. What is the smallest copper grounding electrode conductor that can be installed to the steel structure?
a. 4 AWG
b. 1 AWG
c. 1/0 AWG
d. 3/0 AWG
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What size copper grounding electrode conductor is required for a 1500 kcmil copper service conductor?
a. 2/0 AWG
b. 3/0 AWG
c. 1/0 AWG
d. 2 AWG
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To ensure effective continuity between enclosures, ___ shall be removed from the conduit threads.
a. ends
b. enamel
c. galvanized fnish
d. aluminum
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An equipment bonding jumper on the supply side of the service must not be smaller than the sizes shown in Table ___.
a. 250.102(C)(1)
b. 310.15(B)(16)
c. 250.122
d. 250.66
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A single family dwelling has a 200-amp, 120/240-volt, single-phase, main service panel and is being fed with 2/0 AWG THW copper ungrounded service entrance conductors in rigid metal conduit. The minimum allowable size of the MBJ for this service entrance conduit is ___.
a. 6 AWG
b. 4 AWG
c. 2 AWG
d. 1/0 AWG
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Which of the following is not a true statement per the National Electrical Code?
a. Under certain conditions, equipment grounding conductors smaller than 1/0 shall be permitted to
be run in parallel.
b. Under certain conditions, equipment grounding conductors shall be required to be larger than the
circuit conductors supplying the equipment.
c. One equipment grounding conductor shall be permitted to provide a ground-fault return path for
multiple circuits.
d. The size of the equipment grounding conductors shall be increased where the circuit conductors
have been increased in size.
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All conductors of a circuit are required to ___.
I. be in the same raceway
II. be installed in close proximity in the same trench
III. be the same size
a. III only
b. I only
c. I, II & III
d. I & II only
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In both exposed and concealed locations, where a cable or raceway-type wiring method is installed through bored holes in joists, rafters, or wood members, holes shall be bored so that the edge of the hole is not less than ___ inch(es) from the nearest edge of the wood member.
a. 1 1/4
b. 1/4
c. 1
d. 1 1/2
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Bored holes in wood members for cable or raceway-type wiring shall be bored so that the edge of the hole is not less than ___ from the nearest edge.
a. 1 1/4"
b. 1"
c. 11/2"
d. 1 1/16"
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Electrical installations in hollow spaces, vertical shafts, and ventilation or air-handling ducts shall be so made that the possible spread of fire or products of combustion will not be ___.
a. substantially increased
b. allowed
c. exposed
d. underrated
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When installing a 20-amp, 120 volt, GFCI-protected, below-ground UF cable branch circuit that serves a yard light for a residence, what is the minimum ground cover required for the cable?
a. 6 in.
b. 12 in.
c. 18 in.
d. 24 in.
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Underground cable installed under a building shall be in a ___ that is extended beyond the outside walls of the building.
a. sleeve
b. duct bank
c. gutter
d. raceway
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Underground service conductors carried up a pole must be protected from mechanical injury to a height of at least ___ feet.
a. 12
b. 8
c. 15
d. 9
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When direct-buried conductors emerge from the ground and extend up a pole, these must be protected by enclosures or raceways to a height of ___ feet above finished grade.
a. 8
b. 10
c. 12
d. 15
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Backfill used for underground wiring must not ___.
a. damage the wiring method
b. prevent compaction of the fill
c. contribute to corrosion of the raceway
d. all of these
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Where installing direct-buried cables, a ___ shall be used at the end of a conduit that terminates underground.
I. splice kit II. bushing III. terminal fitting
a. I only
b. I or II only
c. I or III only
d. II or III only
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Conduit used to protect direct-buried cable shall be provided with a ___ where the cable leaves the conduit underground.
a. seal
b. clamp
c. bushing
d. connector
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Where nails or screws are likely to penetrate electrical nonmetallic tubing installed through metal framing members, a steel sleeve, steel plate, or steel clip not less than ___ inch in thickness shall be used to protect the cable or tubing.
a. 1/16
b. 1/8
c. 1/4
d. none of these
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When directly buried outdoors, rigid metal conduit must have at least ___ inches of cover.
a. 6
b. 12
c. 18
d. 24
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What is the minimum burial depth of intermediate metal conduit, containing conductors 600 volts or less, under a residential gravel driveway?
a. 12 in.
b. 18 in.
c. 24 in.
d. 30 in.
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Where raceways are exposed to widely different temperatures, they shall be ___.
a. sealed
b. bonded
c. grounded
d. isolated
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The number and size of conductors in any raceway shall not be more than will permit ___.
I. ready installation or withdrawal of the conductors without damage to the conductors or to their insulation
II. dissipation of the heat
a. I only
b. II only
c. both I and II
d. neither I nor II
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In vertical raceways, 3/0 AWG aluminum conductors must be supported if the vertical rise is greater than ___ ft.
a. 180
b. 80
c. 10
d. 100
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Where conductors carrying alternating current are installed in ferrous metal raceways, they shall be arranged so as to avoid heating the surrounding metal by ___.
a. osmosis
b. hysteresis
c. convection
d. induction
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The number of conductors permitted in raceways is limited to ___.
a. permit heat to dissipate
b. prevent damage to insulation during installation
c. prevent damage to insulation during removal of conductors
d. all of these
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Suitable covers shall be installed on all boxes, f ttings, and similar enclosures to prevent accidental contact with ___ parts or physical damage to parts or insulation. (Over 1000 volts, nominal.)
a. energized
b. electrical
c. mechanical
d. none of these
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Conductors of ac and dc circuits, rated 600 volts, nominal, or less, shall be permitted to occupy the same equipment wiring enclosure if ___.
a. all conductors within the enclosure have an insulation rating equal to at least 600 volts
b. all conductors operating at different voltage levels within the enclosure are separated by a permanent barrier
c. all conductors have an insulation rating equal to at least the maximum circuit voltage applied to any conductor within the enclosure
d. each conductor has an ampacity equal to at least the maximum circuit current carried by each individual conductor within the enclosure
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Electrical installations in hollow spaces, vertical shafts, and ventilation or air-handling ducts must be made so that the possible spread of fre or products will not be ___.
a. substantially increased
b. allowed
c. increased
d. possible
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The air-handling area beneath raised foors for information technology equipment ___ a plenum and ___ required to comply with the requirements of 300.22 but shall be permitted in accordance with Article 645.
a. is, is
b. is not, is not
c. is, is not
d. is not, is
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Generally, the ungrounded conductor of an electrical branch circuit is identified by ___ color.
a. white or gray
b. green or bare
c. gray only
d. none of these
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Among the conductors listed below, all except ___ are permitted to be connected in parallel.
a. 250 kcmil
b. 2/0 AWG
c. 1 AWG
d. 1/0 AWG
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The parallel conductors in each phase, neutral, or equipment grounding conductor shall ___.
a. be the same length and conductor material
b. have the same circular mil area and insulation type
c. be terminated in the same manner
d. all of these
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Conductors shall not be installed in locations where the operating temperature will exceed that specified for the type of ___ used.
a. connectors
b. protection
c. insulation
d. wiring
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Adjacent load-carrying conductors have the dual effect of raising the ___ and impeding heat dissipation.
a. insulation rating
b. heat above 86°F
c. ambient temperature
d. skin effect
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Type XHHW insulated conductors may be used in ___.
a. dry locations only
b. wet locations only
c. dry or damp locations only
d. dry, damp, or wet locations
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Thermoplastic insulated fixture wire shall be durably marked with the AWG size, voltage rating and other required markings on the surface at intervals not exceeding ___ inches.
a. 6
b. 12
c. 18
d. 24
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Which of the following listed conductors has a greater ampacity when used in a dry location compared to when used in a wet location?
a. THW
b. RHW
c. THWN
d. THHW
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A nipple contains six 6 AWG THW copper current-carrying conductors. The ampacity of each conductor would be ___ amperes.
a. 65
b. 50
c. 52
d. 45.5
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When conductors are installed in a nipple ___ inches or less, the ampacity adjustment factors for more than 3 current-carrying conductors in a raceway need not be applied.
a. 24
b. 30
c. 32
d. 36
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As a minimum, a three-wire, 120/240-V single-phase 200 amp service for a dwelling requires ___ AWG THW copper conductors.
a. 4/0
b. 3/0
c. 2/0
d. 1/0
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Determine the conductor ampacity given the following.
* conductors are 500 kcmil THWN copper
* ambient temperature is 125 degrees F.
* eight current carrying conductors are in the raceway
a. 178.2 amps
b. 199.5 amps
c. 294.6 amps
d. 380 amps
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When a conduit contains six current-carrying conductors and is installed in a 22ºC dry location, the allowable ampacity of each of the six 750 kcmil XHHW aluminum conductors is ___ amps.
a. 323.40
b. 365.40
c. 361.92
d. 348.00
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A fixture rated at 7 amps requires a size ___ AWG fixture wire, as a minimum.
a. 16
b. 18
c. 14
d. 12
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The minimum size copper conductor for voltages up to 2,000V is ___ AWG.
a. 16
b. 14
c. 12
d. 10
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Which of these conductors is not permitted in wet locations?
a. MTW
b. THW
c. THHN
d. THWN
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What is the ampacity of 8 AWG XHHW copper in a wet location?
a. 40A
b. 50A
c. 60A
d. 80A
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The ampacity of conductors must be adjusted (decreased) when the ambient temperature exceeds ___°F
a. 36
b. 72
c. 78
d. 86
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What is the ampacity of four 1/0 AWG THW current-carrying copper conductors installed in a raceway in an ambient temperature of 86°F?
a. 120A
b. 125A
c. 130A
d. 140A
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A raceway is 17” in length and contains four 6 AWG THW copper current-carrying conductors. The ampacity of each conductor is ___ amperes.
a. 44
b. 53
c. 55
d. 65
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What is the minimum size copper SE cable with 75°C conductors that may be used for a 150A, 120/240-volt, single phase, dwelling unit service?
a. 3 AWG
b. 2 AWG
c. 1 AWG
d. 1/0 AWG
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For a 100 to 400A, 120/240 volt, single-phase dwelling unit service, the service conductors are permitted to have an ampacity of not less than ___ percent of the service rating.
a. 94
b. 90
c. 83
d. 71
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A neutral conductor that carries only the ___ current from other conductors of the same circuit shall not be required to be counted as a current-carrying conductor when applying the provisions of 310.15(C)(1).
a. balanced
b. line
c. phase
d. unbalanced
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Conductors with thermoplastic and f brous outer braid Type TBS insulation are used for wiring ___.
a. switchboards only
b. in a dry location
c. in a wet location
d. lighting f xtures
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A dwelling has a 225-ampere service that is fed with THW copper conductors. The minimum size copper grounding electrode conductor to the metal water pipe is ___ AWG.
a. 4
b. 6
c. 3
d. 8
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Type MV cables shall be permitted for use on power systems rated up to ___ volts.
a. 600
b. 4,160
c. 2,300
d. 35,000
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Where raceways or cables enter above the level of uninsulated live parts of a cabinet, cutout boxes, or meter socket enclosure in a wet location, a ___ shall be used.
a. fitting listed for damp locations
b. insulating fitting
c. fitting listed for wet locations
d. nonconductive fitting
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Metallic surface-type cabinets in damp or wet locations shall have at least ___ airspace between the cabinet and the wall or other supporting surface.
a. 1/32
b. 1/16
c. 1/8
d. 1/4
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Noncombustible surfaces that are broken or incomplete shall be repaired so there will be no gaps or open spaces greater than ___ at the edge of a cabinet or cutout box employing a flush-type cover.
a. 1/32
b. 1.16
c. 1/8
d. 1/4
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Nonmetallic cables can enter the top of surface-mounted cabinets, cutout boxes, and meter socket enclosures through nonflexible raceways not less than 18 in. or more than ___ in length if all of the required conditions are met.
a. 3 feet
b. 10 feet
c. 25 feet
d. 100 feet
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Conductors feeding through the wiring space or enclosures for switches or overcurrent devices shall not exceed ___ percent of the cross-sectional area of that space.
a. 40
b. 50
c. 60
d. 80
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Cabinets and cutout boxes shall be deep enough to allow the closing of the doors when ___-ampere branch-circuit panelboard switches are in any position, when combination cutout switches are in any position, or when other single-throw switches are opened as far as their construction permits.
a. 15
b. 20
c. 30
d. 100
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Which answer best completes the following sentence describing the Code requirements for the use of short-radius, capped elbow conduit bodies containing conductors smaller than 6 AWG? Capped elbow type conduit bodies ___.
a. are not permitted by Code
b. may be used to enable the installation of the raceway
c. may contain devices
d. may contain splices and taps
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Nonmetallic boxes shall be suitable for the lowest ___ conductor entering the box.
a. AWG size
b. temperature- rated
c. voltage rated
d. ampacity
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The front edge of a switch box installed in a wall constructed of wood shall be ___ from the surface of the wall.
a. flush with or projected out
b. set back a maximum of 1/4 in.
c. set back a maximum of 1/2 in.
d. set back a maximum of 3/8 in.
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Enclosures supported by suspended ceiling systems shall be fastened to the framing member by mechanical means such as ___.
I. clips identified for use II. screws III. rivets IV. bolts
a. I only
b. II only
c. II & IV only
d. I, II, III & IV
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The internal depth of outlet boxes intended to enclose flush devices shall be at least ___.
a. 1/2"
b. 7/8"
c. 15/16"
d. 11/2"
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Luminaires shall be supported independently of the outlet box where the weight exceeds ___ pounds unless the outlet box is listed and marked for the maximum weight to be supported.
a. 60
b. 50
c. 40
d. 30
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Where permanent barriers are installed in a junction box, each section shall be considered as a(n) ___.
a. raceway
b. separate box
c. wireway
d. auxiliary gutter
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The minimum thickness for a cast aluminum box measuring 6" X 4" X 3 1/2" is ___ inches.
a. 3/32
b. .0625
c. 1/8
d. 1.59
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A means shall be provided in each metal box over 100 cubic inches for the connection of an equipment grounding conductor. The means shall be permitted to be ___.
I. a tapped hole
II. the cover screw
III. a screw used to mount the box
a. I only
b. II only
c. I and II only
d. I, II, or III
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For systems over 1000 volts, the distance between each cable or conductor entry inside the box and the opposite wall of the box shall not be less than ___ times the outside diameter, over sheath, of the largest cable or conductor.
a. 6
b. 18
c. 36
d. 48
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How many 14 AWG THW conductors are permitted in a 3" X 2" X 21/2" device box?
a. 5
b. 6
c. 7
d. 8
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A 3" X 2" X 2" device box has a volume of ___ cubic inches.
a. 12
b. 14
c. 10
d. 8
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The MAXIMUM number of 10 AWG conductors permitted in a 4" X 11/4" octagon metal junction box is ___.
a. 2
b. 4
c. 5
d. 6
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How many 12/2 AWG with ground, type NM cables are permitted to be installed in an outlet box that is 18 cubic inches and has a duplex receptacle installed in the box?
a. 1
b. 2
c. 3
d. 4
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For the purpose of determining box fill, 12 AWG THWN copper wire is to be calculated at ___ cu. in.
a. 1.75
b. 2.0
c. 2.25
d. 2.5
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A device box contains four 10 AWG conductors and four 12 AWG conductors. Assuming each conductor carries current, for the purposes of determining box fill, these conductors are equivalent to ___ cubic inches.
a. 17
b. 18
c. 19
d. 20
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When two switches are mounted on the same strap, the number of conductors allowed in the box shall be reduced by a minimum of ___ conductors.
a. 1
b. 2
c. 3
d. 4
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How many 12 AWG conductors may be installed in a 3 1/2" deep, 3-gang masonry box that contains three switches?
a. 22
b. 23
c. 24
d. 27
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Angle pull dimensional requirements apply to junction boxes only when the size of conductors is equal to or larger than ___ AWG.
a. 1/0
b. 4
c. 3/0
d. 6
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A 2 in. raceway is to be installed in a pull box for a straight pull; conductors are 4 AWG or larger. What is the MINIMUM length of the pull box as required by the NEC®?
a. 4 in.
b. 12 in.
c. 16 in.
d. 24 in.
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What is the maximum number of 10 AWG conductors permitted in a 4” x 1 1/2” octagon metal box?
a. 4
b. 6
c. 7
d. 8
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A device box contains four 10 AWG conductors and four 12 AWG conductors. Assuming each conductor carries current, for the purposes of determining box fill, these conductors are equivalent to ___ cubic inches.
a. 17
b. 18
c. 19
d. 20
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How many 12 AWG conductors may be installed in a 3 1/2” deep, 3-gang masonry box with a marked capacity of 63 cubic inches that contains three switches?
a. 22
b. 23
c. 24
d. 27
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A metal outlet box has 27 cubic inches and contains a total of six 12 AWG wires. How many 10 AWG conductors may be added to the box?
a. 2
b. 5
c. 6
d. 8
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Where NM cable is used with a nonmetallic box, the cable sheath must extend into the box not less than ___ beyond any cable clamp.
a. 1/4”
b. 1/8”
c. 1/16”
d. none of these
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In combustible walls or ceilings, how far is the front edge if an outlet box or fitting permitted to be set back from the finished surface?
a. 1/4”
b. 1/8
c. 1/16”
d. none of these
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In noncombustible walls or ceilings, how far is the front edge of an outlet box or fitting permitted to be set back from the finished surface?
a. 1/4”
b. 1/8”
c. 1/16”
d. none of these
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Vertically-mounted luminaires weighing up to ___ pounds can be supported by boxes not specifically designed to support luminaires, provided the luminaire or its supporting yoke is secured to the box with at least two No. 6 or larger screws.
a. 3
b. 4
c. 6
d. 8
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A luminaire mounted in a ceiling must be supported independently of the outlet box if it weighs more than ___ pounds, unless the outlet box is listed and marked for the maximum weight to be supported.
a. 6
b. 25
c. 35
d. 50
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In pull boxes or junction boxes having any dimension over ___ inches, all conductors shall be cabled or racked up in an approved manner.
a. 72
b. 48
c. 36
d. 24
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Angle pull dimensional requirements apply to junction boxes with conductors ___ AWG or larger.
a. 1
b. 2
c. 3
d. 4
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In straight pulls, the length of the box shall not be less than ___ times the trade diameter of the largest raceway for conductors 4 AWG and larger.
a. 12
b. 8
c. 6
d. 4
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When a pull box contains conductors of a 4 AWG and larger and an angle pull of the conductors is to be made, the length of the box shall not be less than ___ times the trade diameter of the largest raceway entering the box.
a. 12
b. 8
c. 6
d. 4
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Handhole enclosures shall be ___ for use in underground systems.
a. approved
b. identified
c. listed
d. suitable
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In inches, what is the maximum distance that a receptacle wall box can be set back from the finished surface of a 1/4-inch wood-paneled wall?
a. 0.0
b. 0.25
c. 0.125
d. 0.0625
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A luminaire that weighs more than ___ pounds shall be supported independently of the outlet box unless the outlet box is listed for the weight to be supported.
a. 23
b. 6
c. 20
d. 50
Show Answer
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A luminaire shall be supported independently of the outlet box when it weighs more than ___ pounds unless the outlet box is listed and marked for the maximum weight to be supported.
a. 6
b. 25
c. 35
d. 50
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Which of the following may not be used in damp or wet locations?
a. type AC armored cable
b. open wiring
c. electrical metal tubing
d. rigid metal conduit
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When armored cable is installed in thermal insulation, the rating of the contained conductors shall be ___, and the ampacity of these applications shall be that of ___ conductors.
a. 90ºC - 75ºC
b. 60ºC - 75ºC
c. 75ºC - 90ºC
d. 90ºC - 60ºC
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Type AC cable is permitted for which of these?
a. branch circuits
b. feeders
c. wet locations
d. damp locations
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Where run across the top of floor joists, or within ___ feet of the floor, AC cable installed across the face of rafters must be protected by substantial guard strips that are at least as high as the cable for attics with permanently installed stairs
a. 10
b. 9
c. 8
d. 7
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Type AC cable must be secured within ___ inches of every outlet box.
a. 8
b. 10
c. 12
d. 14
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Type AC cable must be supported by staples, cable ties, straps, hangers, or similar fitting at intervals not exceeding ___ feet.
a. 4 1/2
b. 6
c. 8
d. 10
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Type AC cable must have an internal bonding strip of ___ in intimate contact with the armor.
a. aluminum
b. copper
c. copper-clad aluminum
d. any of these
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Voltage between the hot (ungrounded) conductors on FCC cable shall not exceed ___ volts.
a. 50
b. 300
c. 150
d. 600
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Metal components of the FCC system shall be ___.
I. insulated from contact with corrosive substances
II. coated with corrosion-resistant materials
III. corrosion-resistant
a. I only
b. II only
c. III only
d. I, II, or III
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Type MC cable shall be supported and secured at intervals not exceeding ___.
a. 1.8 ft
b. 3 ft
c. 4 1/2 ft
d. 6 ft
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Where Type MI cable terminates, an end seal fitting shall be provided immediately after stripping to prevent the entrance of ___ into the insulation.
a. oil
b. moisture
c. contaminates
d. debris
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Where run across the top of floor joists, or within ___ feet of the floor or floor joists across the face of rafters or studding, in an attic that has permanent stairs, nonmetallic sheathed cable must be protected by substantial guard strips that are at least as high as the cable.
a. 6
b. 2
c. 12
d. 7
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___ of insulating material shall be permitted to be used without boxes in exposed cable wiring.
I. Switch devices II. Outlet devices III. Tap devices
a. I only
b. II only
c. III only
d. I, II & III
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When installing 2" rigid metal conduit with threaded fittings, the NEC® requires the maximum distance between supports to be no more than ___.
a. 3 ft
b. 5 ft
c. 10 ft
d. 16 ft
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In existing buildings where the nonmetallic sheathed cable is concealed, listed interconnector devices of insulating material shall be permitted to be used without boxes ___.
a. in exposed cable wiring
b. for repair wiring
c. both a and b
d. neither a nor b
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The ampacity of UF cable shall be that of ___ degree C conductors.
a. 60
b. 75
c. 85
d. 90
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Type UF cable and associated ___ shall be listed.
a. accessories
b. fittings
c. hardware
d. none of these
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The ampacity of type UF cable shall be that of ___ °C conductors in accordance with 310.15.
a. 60
b. 75
c. 90
d. 105
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For industrial machinery, straight exposed vertical risers of intermediate metal conduit with threaded couplings are permitted if supported at the top and bottom no more than ___ feet apart.
a. 10
b. 12
c. 15
d. 20
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A section of 3/8" flexible metallic conduit is permitted for tap conductors when connecting to light fixtures, provided the length of the flex does not exceed ___.
a. 3 ft
b. 4 ft
c. 6 ft
d. 8 ft
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In an underground polyvinyl chloride conduit system that consist of a 20-ft. length between pulling points, what is the maximum number of bends that this run may have?
a. 4 - 90 deg.
b. 6 - 90 deg.
c. 4 - 120 deg.
d. 2 - 360 deg.
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Aluminum fittings and enclosures shall be permitted to be used with steel EMT where not subject to ___.
a. severe corrosive influences
b. physical damage
c. moisture
d. any of these
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The maximum size of flexible metallic tubing is trade size ___.
a. 4
b. 3/4
c. 1
d. 2
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Electrical nonmetallic tubing shall be clearly and durably marked at least every ___ feet.
a. 3
b. 6
c. 8
d. 10
Show Answer
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Which of the following statements, if either, is true regarding the overcurrent protection of busways?
I. A busway rated for 1800 amps is permitted to be protected with a 2000-amp breaker.
II. A busway rated for 1400 amps is permitted to be protected with a 1600-amp breaker.
a. I only
b. II only
c. both I and II
d. neither I nor II
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A 300-foot run of 800-amp busway is installed in a commercial warehouse building. The last 20′ of the busway run is reduced to a bus rating of 200 amps. Which of the following best describes the requirement for installation of the smaller bus?
a. This installation meets Code requirements.
b. It must be protected by an overcurrent device.
c. Busway is not permitted in commercial buildings.
d. It must be at least Z\c the ampere rating of the larger bus.
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For industrial establishments only, omission of overcurrent protection shall be permitted at points where busways are reduced in size, provided that the smaller busway does not extend more than 50 feet and has a current rating at least equal to ___ the rating or setting of the overcurrent device next back on the line.
a. 80%
b. 1/3
c. 1/2
d. 75%
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A fexible cord connection is made directly to the load end terminals of a busway plug-in device. The maximum length of this cord to a tension take-up device is ___ feet.
a. 3
b. 4
c. 5
d. 6
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The size and number of conductors shall be that for which the cablebus is designed, and not smaller than ___.
a. 1/0 AWG
b. 2/0 AWG
c. 2 AWG
d. 10 AWG
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When an outlet is removed from a cellular metal floor raceway, the sections of circuit conductors supplying the outlet shall be ___.
a. taped
b. dead-ended
c. shorted together
d. removed from the raceway
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Except by special permission, no conductor larger than ___ shall be installed in cellular metal floor raceways.
a. 1/0 AWG
b. 2/0 AWG
c. 250 kcmil
d. 500 kcmil
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Nonmetallic surface extensions must be secured in place by approved means at intervals not exceeding ___ inches.
a. 36
b. 12
c. 24
d. 8
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When calculating the conductor fill for strut-type channel raceway with external joiners, the raceway shall be permitted to be filled to ___ percent of the cross-sectional area.
a. 20
b. 25
c. 30
d. 40
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In general, the voltage limitation between conductors in surface metal raceways is ___ volts.
a. 300
b. 500
c. 600
d. 1000
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When an outlet from an underfloor raceway is discontinued, the sections of the circuit conductors supplying the outlet ___.
a. shall be permitted to be spliced
b. shall be removed from the raceway
c. shall be permitted to be reinsulated
d. shall be handled like abandoned outlets on loop wiring
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Messenger supported wiring shall not be used ___.
I. where subject to severe physical damage
II. in hoistways
a. I only
b. II only
c. both I and II
d. neither I nor II
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Flexible cords and cables shall NOT be ___.
a. used as elevator cables
b. run through holes in walls
c. used as data processing cables
d. used to prevent transmission of vibration
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Flexible cords ___ AWG and larger are used to supply approved appliances and are considered protected from overcurrent by overcurrent devices.
a. 18
b. 16
c. 14
d. 12
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The identification of the grounded conductor in a flexible cord shall be permitted to be by ___.
a. any color braid with contrasting tracer
b. a braid finished to show a blue color
c. green insulation on the conductor
d. black color on the conductor
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Electric vehicle cable type EVJ ___.
I. is available in sizes 18 AWG to 500 kcmil
II. is rated for extra hard usage
III. has thermoset insulation
a. I only
b. II only
c. III only
d. I, II & III
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What is the maximum allowable ampacity of 14/2 AWG SJT cord?
a. 15 amperes
b. 13 amperes
c. 20 amperes
d. 18 amperes
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The fixture wires listed in Table 402.3 are all suitable for service at ___ volts, nominal, unless otherwise specified
a. 300
b. 600
c. 1,000
d. 2,000
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Fixture wires shall not be used as ___ conductors except as permitted elsewhere in the code?
a. branch circuit
b. control circuit
c. luminaire
d. any of these
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When used as a switch, the height of a circuit breaker shall not exceed ___ above the foor.
a. 6′
b. 4 1/2
c. 5′
d. 6′-7″
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Given: You have a 2-gang box that contains two single-pole switches; unless the box is equipped with permanently installed barriers, the voltage between the switches shall not be in excess of ___ volts.
a. 125
b. 300
c. 480
d. 250
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Non-grounding-type receptacles shall be permitted to be replaced with another ___ type receptacle.
a. grounding
b. weatherproof
c. non-grounding
d.
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A nongrounding-type receptacle has been replaced with a new grounding-type duplex receptacle. The 15-ampere circuit breaker feeding the circuit has been replaced with a 15-ampere GFCI breaker. The new receptacle must be marked “___.”
I. Two-Wire Circuit
II. No Equipment Ground
III. GFCI Protected
a. III only
b. I & II only
c. II only
d. II & III only
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Receptacle faceplate covers made of insulating material shall be noncombustible and not less than ___ inch in thickness.
a. 0.10
b. 0.04
c. 0.01
d. 0.22
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Receptacles connected to circuits having different voltages, frequencies, or types of current (ac or dc) on the ___ shall be of such design that the attachment plugs used on these circuits are not interchangeable.
a. building
b. interior
c. same premises
d. exterior
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A receptacle shall be considered protected from the weather when located under roofed open porches, canopies, marquees, and the like where it will not be subject to ___.
a. spray from a hose
b. a direct lightning hit
c. beating rain or water runoff
d. falling or wind-blown debris
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The minimum wire bending space required at the top and bottom of a panelboard that has three 3/0 AWG conductors connected to each busbar is ___.
a. 8 in.
b. 7 in.
c. 5 in.
d. 3 1/2 in.
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Luminaires shall not be used as a raceway for circuit conductors unless ___ for use as a raceway.
I. listed II. approved III. marked
a. I only
b. I & II only
c. I & III only
d. II & III only
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A luminaire that weighs more than 6 pounds or exceeds ___ inches in any dimension shall not be supported by the screw shell of a lampholder.
a. 12
b. 6
c. 24
d. 16
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A luminaire installed outdoors is permitted to be supported by ___.
I. trees II. a metal pole III. an outlet box
a. I only
b. II and III only
c. II only
d. I, II, or III
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The rating of any one cord-and-plug-connected utilization equipment not fastened in place shall not exceed ___ % of the branch-circuit ampere rating.
a. 100
b. 50
c. 125
d. 80
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No parts of pendants shall be located within a zone measured ___ feet horizontally and 8 feet vertically from the top of the bathtub rim.
a. 2
b. 3
c. 4
d. 6
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Incandescent luminaires that have open lamps and pendant-type luminaires ___ be installed in clothes closets where proper clearance is maintained from combustible contents.
a. shall
b. shall not
c.
d.
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Surface-mounted fluorescent luminaires in clothes closets can be installed on the wall above the door or on the ceiling, provided there is a minimum clearance of ___ inches between the luminaire and the nearest point of a storage space.
a. 3
b. 6
c. 9
d. 12
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A recessed incandescent luminaire with a solid lens is installed in the ceiling of a clothes closet. This luminaire must ___.
a. be installed a minimum of 12" from storage space
b. be installed a minimum of 6" from storage space
c. be installed a minimum of 24" from storage space
d. A recessed luminaire is not permitted in a clothes closet.
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Coves for luminaires shall have adequate space and shall be so located that the lamps and equipment can be properly installed and ___.
a. maintained
b. tested
c. protected from physical damage
d. listed
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The maximum weight of a luminaire that may be mounted by the screw shell of a brass socket is ___ pounds.
a. 2
b. 6
c. 3
d. 50
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Built-in dishwashers and trash compactors intended for dwelling use are allowed to be cord-and-plug-connected when ___.
a. the receptacle is located in the same space or adjacent to
b. the cord is 3 to 4 feet long and the receptacle is accessible
c. the receptacle is located to avoid physical damage to the cord
d. all of these
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What is the maximum allowable cord length for a cord-and-plug-connected dishwasher installed under a counter in a dwelling unit?
a. 1 1/2 ft.
b. 2 ft.
c. 3 ft.
d. 6 1/2 ft.
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A permanently connected dishwasher has a nameplate rating of 780 volt-amperes. The circuit breaker is permitted to serve as the disconnecting means where it is ___.
I. within sight from the dishwasher
II. capable of being locked in the closed position
III. capable of being locked in the open position
a. I only
b. I or II only
c. II only
d. I or III only
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Water heaters having a capacity of ___ gallons or less shall have a branch-circuit rating not less than 125% of the rating of the water heater.
a. 60
b. 75
c. 90
d. 120
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If a switch or circuit breaker serves as the disconnecting means for a permanently connected motor-driven appliance of more than ___ horsepower, it shall be located within sight from the motor controller.
a. 1/8
b. 1/4
c. 1/2
d. 3/4
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The maximum overcurrent device permitted to protect a 208-V, 5 kW appliance connected with 8 AWG copper is ___ amps.
a. 25
b. 30
c. 35
d. 40
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All heating elements that are ___ and part of an appliance shall be legibly marked with the ratings in volts and amperes, or in volts and watts, or with the manufacturer’s part number.
I. replaceable in the field
II. rated over one ampere
III. rated over 150 volts
a. II & III only
b. I & II only
c. I & III only
d. I, II & III
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Where a GFCI receptacle is used to provide power for an electric drinking fountain, the NEC ® requires the receptacle to be ___.
a. readily accessible
b. AFCI protected
c. both a and b
d. neither a nor b
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A 240-volt, 20-amp circuit may supply ___ linear feet of electric baseboard heat. The baseboard heaters being used are rated at 250 watts per linear foot at 240 volts.
a. 12
b. 15
c. 16
d. 18
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Given: A fixed electric space heater without a motor is installed in a multifamily dwelling.
· The heater has no supplementary overcurrent protection.
· The heater is controlled with a thermostat which does not have a marked "off" position.
· The branch-circuit switch or circuit breaker is not "within sight from" the heater.
For the branch-circuit switch or circuit breaker to be permitted to serve as the disconnecting means for the heater, the switch or breaker must ___.
a. be readily accessible
b. not control lamps or other appliances
c. be capable of being locked in the open position
d. be located within the dwelling unit or on the same floor as the heater
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Means shall be provided to simultaneously disconnect the ___ of all f xed electric space-heating equipment from all ungrounded conductors.
I. heater
II. motor
III. motor controllers
IV. supplementary overcurrent protective devices
a. I & II only
b. II & IV only
c. I & IV only
d. I, III & IV only
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Electrically heated floors in kitchens, bathrooms and hydromassage bathtub locations shall be ___.
a. GFCI protected
b. AFCI protected
c. grounded
d. isolated
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The total rating of a plug-connected room air conditioner where lighting units or other appliances are also supplied shall not exceed ___ percent.
a. 80
b. 70
c. 50
d. 40
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Live parts of generators operated at more than ___ volts to ground shall not be exposed to accidental contact where accessible to unqualifed persons.
a. 30
b. 50
c. 12
d. 150
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A transformer rated ___ kVA or larger shall be provided with a nameplate giving the name of the manufacturer, rated kVA, frequency, primary and secondary voltage, and the impedance of the transformers.
a. 112.5
b. 50
c. 33
d. 25
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Where a terminal bar for grounding and bonding is required in a dry-type transformer enclosure, the terminal bar ___.
a. shall be bonded to the enclosure
b. shall not be installed on or over any vented portion of the enclosure
c. both a and b
d. neither a nor b
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Plug-in-type overcurrent protection devices or plug-in-type main lug assemblies that are ___ shall be secured in place by an additional fastener that requires other than a pull to release the device from the mounting means on the panel.
a. 3-phase only
b. 480-volt
c. back fed
d. none of these
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Switches, flashers, and similar devices controlling transformers and electronic power supplies shall be rated for controlling inductive loads or have a current rating not less than ___% of the transformer’s current rating.
a. 2
b. 125
c. 200
d. 150
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A branch circuit serving emergency lighting and power circuits shall not be part of a(n) ___ branch circuit.
a. multiwire
b. general-purpose
c. individual
d. appliance
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Five 1 AWG and five 3 AWG copper THW conductors are to be installed in a 20-foot length of IMC raceway. What is the minimum allowable trade size IMC required to contain these ten conductors?
a. 1 1/2 in.
b. 2 in.
c. 2 1/2 in.
d. 3 in.
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A 1 1/2" RMC nipple with three conductors can be filled to an area of ___ square inches.
a. .98
b. 1.07
c. 1.243
d. 1.34
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What size Schedule 40 PVC is required for eight 6 AWG XHHW conductors?
a. 3/4"
b. 1"
c. 1 1/4"
d. 1 1/2"
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Determine the MINIMUM trade size EMT required to enclose eight 6 AWG THHW copper conductors installed in a 50-ft. conduit run.
a. 1 in.
b. 1 1/4 in.
c. 1 1/2 in.
d. 2 in.
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Equipment grounding conductors, when installed, ___ be included when calculating conduit fill.
a. shall not
b. shall
c. should not
d. should
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When the calculated number of conductors, all of the same size, includes a decimal fraction, the next higher whole number shall be used if ___.
a. .5 and larger
b. .6 and larger
c. .7 and larger
d. .8 and larger
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When conduit nipples having a maximum length not to exceed ___ inches are installed between boxes and similar enclosures, the nipples shall be permitted to be filled to 60% of their cross-sectional area.
a. 6
b. 12
c. 18
d. 24
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The approximate area in square inches for a 4/0 AWG THW aluminum building wire is ___.
a. .3288
b. .3904
c. .3267
d. .2780
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