Second half of Second somester
A location in which ignitible flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors are or may be present in the air in quantities sufficient to produce explosive or ignitible mixtures are consider Class ___.
1
For a stationary motor rated at ___ hp or less that is normally left running and is constructed so that it cannot be damaged by overload or failure to start, such as clock motors and the like, the branch-circuit disconnecting means shall be permitted to serve as the controller.
1/8
When motors are ___ hp or greater, the motor nameplate shall include the rated horsepower.
1/8
A conduit seal shall be required in each conduit run leaving a Class I, Division 2 location. The sealing fitting shall be permitted to be installed on either side of the boundary within ___ feet of the boundary.
10
The equipment grounding terminal buses of the normal and essential branch-circuit panelboards serving the same individual patient care vicinity shall be connected together with an insulated continuous copper conductor not smaller than ___ AWG.
10
Once normal power is dropped in a health care facility, the life safety branch and critical branch circuits must be automaticaly restored to operation within:
10 seconds
A place of assembly is a building or portion of building designed or intended for the assembly of ___ or more persons.
100
Buildings or portions of buildings or structures designed or intended for the gathering together of ___ or more persons for such purposes as deliberation, worship, entertainment, eating, drinking, amusement, awaiting transportation, or similiar purposes is considered an assembly occupancy.
100
Where an assembly occupancy forms a portion of a building containing other occupancies, occupancy of any room or space for assembly purposes by less than ___ persons in one of the other occupancies shall be classified as part of the other occupancy and subject to the provisions applicable thereto.
100
Scenario 230-28Motor Nameplate Information: 5 hp 208-230/460-V 3Ø Branch Circuit Supply: 3-pole breaker in a 120/208-V, 3-ph, 4-W panelFor the motor in Scenario 230-28, the minimum size SO cord permitted contains ___ AWG conductors.
11
For a hermetic refrigerant motor-compressor, the ampere rating of the disconnect shall be ___% of the nameplate rating or the branch circuit selection current, whichever is greater.
115
The disconnecting means of a hermetic-type refrigerator compressor shall have an ampacity of at least ___ of the nameplate rated-load current.
115%
Stems of metal conduit for pendant luminaires in Class III, Division 2 locations shall be braced against lateral displacement if the stems are longer than ___ inches.
12
A horizontal raceway, entering a dust-ignitionproof enclosure from one that is not, need not have a seal-off if it is at least ___ inches in length.
120
The maximum surface temperature for motors in Class III locations shall not exceed ___ degrees Celcius.
120
A toggle switch (standard AC only "light" switch) can be used as the controller (ON/OFF switch) for a stationary motor rated at 2 hp or less and 300 volts or less as long as the switch has an ampere rating that is at least ___ % of the motor ampere rating.Note: the NEC® considers a toggle switch to be a general-use snap switch. See the definition in Article 100.
125
Branch-circuit conductors supplying more than one motor shall have an ampacity of at least ___ percent of the FLC of the largest motor, plus 100% of the FLC of the other motor(s) in the group.
125
Conductors that supply a single motor used in a continuous duty application shall have an ampacity of ___% of the motor FLA.
125
Continuous duty motors with a marked service factor not less than 1.15 shall have the minimum running overload protection sized at ___ percent of the nameplate rating of the motor.
125
To provide protection for small air conditioner motor-compressors without the locked-rotor current marked on the nameplate, fused protection at ___ can be utilized.
125% of the rated current
Each patient bed location in a Category 1 (critical care) space shall be provided with a minimum of ___ receptacles.
14
Portable amusement rides and amusement attractions shall be maintained not less than ___ feet in any direction from overhead conductors operating at 600 volts or less, except for the conductors supplying the amusement ride or attraction.
15
The largest 1-pole circuit breaker that can be used to protect a 14 AWG copper Type SO flexible cord is ___ A.
15
Uninsulated exposed parts, such as electrical conductors, buses, terminals, or components shall operate at not more than ___ volts in wet locations in Class III, Divisions 1 and 2 locations.
15
For AC adjustable voltage, variable torque drive motors, the ampacity of conductors, or ampere ratings of switches, circuit breakers, or fuses, and ground-fault protection shall be based on the operating current marked on the nameplate. If the current does not appear on the nameplate, the ampacity determination shall be based on ___ of the values given in tables 430.249 and 430.250.
150%
Enclosures in a Class I, Division 1 location containing components that have arcing devices must have an approved seal located within ___ inches of each conduit run entering or leaving such enclosures.
18
Fixture wires used for luminaires shall not be smaller than ___ AWG.
18
Flexible cords ___ AWG and larger are used to supply approved appliances and are considered protected from overcurrent by overcurrent devices.
18
What is the maximum allowable ampacity of 14/2 AWG SJT cord?
18 amperes
Alternating current, general-use snap switches are UL-listed to control motors rated up to ___ horsepower.
2
How many independent power sources are required for the essential electrial system of a health care facilty?
2
In raceways, cable trays, and cables, conductors of intrinsically safe circuits must be separated from conductors of non-intrinsically safe circuits by a minimum of ___.
2 inches
Refer to the nameplate and information shown in Figure 230.131. The minimum hp rating of any manufacturer's safety switch must be ___ hp at the applied voltage.
20
Several motors, each not exceeding 1 horsepower in rating, shall be permitted on a nominal 120-volt branch circuit protected at not over ___ amperes.
20
The power supply cord for a mobile home measured from the face of the attachment plug cap to the point where the cord enters the mobile home shall not be less than ___ feet.
20
When sizing fuses for a branch circuit serving a hermetic refrigerant motor-compressor, the device shall NEVER exceed ___ percent of the rated-load current marked on the nameplate of the equipment.
225
The largest 2-pole circuit breaker that can be used to protect a 12 AWG copper Type SJO flexible cord serving a single-phase load is ___ A.
25
Raceways, cable trays, and other wiring methods for intrinsically safe wiring shall be identified with permanently affixed labels no more than what distance apart?
25′ or 7.5 m
Disregarding exceptions, what is the minimum number of overload units required by the NEC® to protect a 3-phase motor?
3
The walls and roofs of transformer vaults shall have a fire rating of ___ hours.
3
All hazardous (classified) location threaded conduit shall be threaded with an NPT standard conduit cutting die that provides ___ inch taper per foot.
3/4
Panelboards equipped with snap switches rated ___ amperes or less shall have overcurrent protection of 200 amperes or less.
30
There shall be no uninsulated exposed parts, such as electrical conductors, buses, terminals, or components, that operate at more than ___ volts in a dry location in Class II, Division 1 and 2 locations.
30 V
Where (snap) switches are installed in multigang boxes without permanent barriers (partitions) the maximum voltage between adjacent switches is ___ volts.
300
A snap switch shall not be grouped or ganged in enclosures with other snap switches, receptacles or similiar devices, unless they are arranged so that the voltage between adjacent devices does not exceed ___, or unless they are installed in enclosures equipped with identified, securely installed barriers between adjacent devices.
300 volts
In NEC® Article 500.8, equipment marked for use in Class I locations and has a marked temperature classification of T3B is suitable for use in environments with a maximum surface temperature of ___.
329ºF
Refer to the nameplate shown in Figure 230.128. The branch circuit for the motor is supplied from a 120/240-volt, 3Ø, 4-wire panelboard. What is the minimum size (3 wire + ground) STO cord that could be used as a flexible connection for the motor?
4
Refer to the nameplate shown in Figure 233.135. The smallest wire you could use for the circuit conductors is ___ AWG.
4
The minimum height of the door sill for a transformer vault is ___ inches.
4
In which location is lighting track permitted?
4 feet above the floor operating on 24 volts.
A code letter D is marked on a motor nameplate. What is its locked-rotor kVA per horsepower?
4.0 - 4.49
For a nonautomatically started motor, the overload protection shall be permitted to be shunted or cut out of the circuit during the starting period of the motor if the device by which the overload protection is shunted or cut out cannot be left in the starting position and if fuses or inverse time circuit breakers rated or set at not over ___ percent of the full-load current of the motor are located in the circuit so as to be operative during the starting period of the motor.
400
Article ___ in the NEC® concerns switchboards. A switchboard is shown above in Figure 210.9.
408
Conductors for a motor used in a short-time, intermittent, periodic, or varying duty application shall have an ampacity of not less than the percentages of the motor nameplate current ratings shown in Table ___.
430.22(E)
When sizing the branch-circuit short-circuit and ground-fault protection for a three-phase AC motor, you would use Table ___.
430.250
Overcurrent protection for generators is found in ___.
445.12
For Group C equipment in Class I, Division 1 locations, threaded joints shall be made up with at least ___ threads fully engaged.
5
Refer to Figure 210.6, shown above. The conductors connected to the terminal lugs are 350 kcmil. The minimum wire bending space required at I is ___ inches. These lugs are NOT removable.
5
In a class II, division I location where a raceway provides communication between an enclosure that is required to be dust-ignitionproof and one that is not, a vertical raceway not less than ___ feet long and extending downward from the dust-ignitionproof enclosure is a suitable means to prevent the entrance of dust.
5 ft
Given: You are installing 1/2″ rigid metal conduit in a Class I location and a conduit seal is required. The minimum thickness of the sealing compound shall not be less than ___.
5/8 in.
Refer to the nameplate shown in Figure 233.133. The largest circuit breaker you could install is ___ A.
50
The total rating of a plug-connected room air conditioner where lighting units or other appliances are also supplied shall not exceed ___ percent.
50
The locked-rotor current of a 75 hp, 460-volt, three-phase, Design B motor is ___ amps.
543
Each carnival ride and concession shall be provided with a fused disconnect switch located within sight of and within ___ feet of the operator's station.
6
Each portable stucture at a circus shall be provided with a disconnect switch located within sight of and within ___ feet of the operator's station.
6
Refer to the nameplate shown in Figure 233.134. The smallest wire you could use for the circuit conductors is ___ AWG.
6
The disconnecting means for a ride at a fair shall be located within sight and within ___ feet of the operator's station.
6
What is the allowable ampacity for 18 AWG fixture wire?
6 amperes
When a flexible cord is used to supply a 240-volt room air conditioner, the length of such cord shall not exceed ___.
6 feet
The main service disconnect handle (fused pullout or main breaker) shall not be positioned higher than ___ above the floor.
6 ft-7 in
The minumum clearance between a surface mounted fluorescent luminaire installed on the wall above the door and the nearest point of a storage space in a clothes closet is ___.
6 inches
A pin and sleeve type receptacle is required for shore power at marinas when the receptacle is rated ___ amps or higher.
60
Control circuit devices in a motor control starter with screw-type pressure terminals used with 14 AWG copper conductors shall be torqued to a minimum of ___ lb-in. unless identified for a different torque value.
7
Refer to the nameplate shown in Figure 233.134. The largest fuse you could install in a fused safety switch is ___ A.
70
All cables installed in agricultural buildings shall be secured within ___ inches of each cabinet, box, or fitting.
8
Each general care area patient bed location shall be provided with at least ___ receptacle(s).
8
When a cord-connected window (room) air conditioner is the only connected load, the current drawn by the unit shall not exceed ___% of the branch circuit rating.
80
Refer to Figure 210.6, shown above. The conductors connected to the terminal lugs are 350 kcmil. The minimum wire bending space required at II is ___ inches. These lugs are of the lay-in type.
9
The nameplate for a 15 HP, three-phase motor shows an FLA of 18 amps at 460 volts. What minimum size SOO cord is required to connect the motor to the branch circuit?
9
The conductors for a 30-minute-rated motor, used for intermittent duty, are permited to have a rating ___% of the motor nameplate current rating.
90
Which is an example of a support space in a health care facility?
Anesthesia work rooms
Which of the following is required to be on the life safety branch of a patient care area?
Automatic doors
Shown above is 42-Circuit Panelboard L. It is fed from a 120/240-volt, 1Ø, 3-wire utility transformer. Circuit number 42 is connected to ___.
AØ
A switchboard is fed from a 3-phase, 4-wire, delta-connected system. The ___ phase shall be the phase having the higher voltage to ground.
B
___ shall be placed in all service-entrance motor control centers to isolate service busbars and terminals from the remainder of the motor control center.
Barriers
A space in a health care facility which failure of equipment or a system is not likely to cause injury to the patients, staff or visitors but can cause patient discomfort is a:
Category 3
The Class and Material Group Classification where combustible metal dusts such as magnesium are present is ___.
Class II, Group E
In accordance with NEC® Section 500.6, flour mills and grain elevators contain atmospheres of combustible dusts that require equipment to be classified as ___.
Class II, Group G
A ___ location is a location in which easily ignitable fibers are stored or handled other than in the process of manufacture.
Class III, Division 2
Shown above is 42-Circuit Panelboard HB. It is fed from a 277/480-volt, 3Ø, 4-wire utility transformer bank. Circuit number 41 is connected to ___.
CØ
Which is not an example of a critical care space?
Dialysis rooms
Which wiring type is not permitted in Class II, Division 1 locations?
EMT
Which of the following would be permitted to be connected to the equipment branch circuit?
Exhaust ventilating systems for operating rooms
A space in a health care facility which failure of equipment or a system is likely to cause minor injury to patients, staff or visitors is a:
General Care Space
Wiring devices that are marked with CO/ALR are suitable for use with ___ conductors.I. aluminum II. copper III. copper-clad aluminum
I, II & III
The phase arrangement on 3-phase buses shall be A, B, C from ___, as viewed from the front of the switchboard or panelboard. I. front to back II. top to bottom III. left to right
I, II, and III
The requirements of NEC® Section 547.10 apply to ___.I. chicken farms II. dairy barns III. beef cattle feed lots
II & III only
A motor control circuit ___. I. carries electric signals to the controller and carries the main power II. does not carry electric signals to the controller but does carry the main powerIII. carries the electric signals to the controller but does not carry main power
III only
Electric vehicle cable type EVJ ___. I. is available in sizes 18 AWG to 500 kcmil II. is rated for extra hard usageIII. has thermoset insulation
III only
A 5-gang box and a partition are shown above in Figure 210.5. The box will contain single-pole switches A, B, C, D & E that are fed from the following circuits that originate in a 277/480-volt, 3Ø, 4-wire panelboard: Switches A and B are fed from Circuit 1 Switches C and D are fed from Circuit 7 Switch E is fed from Circuit 10The NEC® requires that partitions be installed between switches ___.I. A & B II. B & C III. C & D IV. D & E
IV only
What is the correct color to use for an intrinsically safe conductor?
Light Blue
Refer to Figure 232.103. ___ could be used as a disconnecting means for a 5 horsepower, 240-volt, single-phase motor.
Neither I nor II
When raised covers ("industrial covers") are used for receptacles, does the Code permit fastening the receptacle to the cover with just the one center 6/32 screw (as shown)?
No
Ampacities for flexible cords are determined using ___ in the NEC®.
Section 400.5
The current from ___ is used to determine the branch circuit conductor size for a 1Ø motor.
T.430.248
All fixed wiring in an aircraft hangar but not installed in a Class I location shall be installed in metal raceways or shall be Type MI, ___, or MC cable.
TC
The equipment branch circuit of the essential electrical system is allowed to be run in the same conduit as normal branch circuits.
True
Where used for essential electrical system branch circuits that supply patient care areas of a hospital, permitted wiring methods include ___.
Type MI cable
Which sources of power are not allowed to be a source of power for the essential electrical system for a health care facility?
UPS systems
Within patient care areas, ___ is permitted to be used as the wiring method to connect a receptacle to the branch circuit.
a 12-foot length of Type AC cable containing an insulated EGC
The term equipotential plane refers to installations in which of the following types of buildings or facilities?
agricultural
The Zone 20, 21, and 22 classification system is ___ the division classification system covered in Article 500.
an alternative to
In patient care areas, all receptacles and all non-current-carrying conductive surfaces of fixed electric equipment operating at over 100 volts that is likely to become energized and is subject to personal contact shall be connected to ___.
an insulated copper equipment grounding conductor
Isolated ground receptacles are identified by ___.
an orange triangle
The identification of the grounded conductor in a flexible cord shall be permitted to be by
any color braid with contrasting tracer
Flexible cords shall be connected to devices and to fittings so that tension will not be transmitted to joints or terminal screws. This shall be accomplished by ___.
any of these
GFCI-protected receptacles ___ permitted to be installed within a tub or shower space.
are not
Instantaneous-trip circuit breakers can be installed ___.
as a part of listed combination with a motor controller
In general, flexible cords are not permitted in which application?
attached to building surfaces
For assembly occupancies, illumination shall be provided for all working spaces about fixed electrical equipment. Control by ___ only shall not be permitted.
automatic means
Plug-in-type overcurrent protection devices or plug-in type main lug assemblies that are ___ and used to terminate field-installed ungrounded supply conductors shall be secured in place by an addtional fastener that requires other than a pull to release the device from the mounting means on the panel.
backfed
The bonding conductor of the equipotential plane in an agricultural building is allowed to be ___.
bare
Flexible cords used in Zone 20, 21, and 22 locations shall ___.
be listed for extra-hard usage
Motor controllers must be marked with ___.I. maximum rated voltage II. maximum hp or current rating
both I & II
If a common-trip 2-pole breaker is used for a 1Ø, 208-volt circuit, ___. I. both "hots" will open when a short circuit or ground fault occursII. both "hots" can be manually opened
both I and II
NEC® 430.102 requires that a ___ have a disconnecting means and that it be in sight.
both a & b
In general, a motor disconnecting means must disconnect ___.
both the motor and controller
Intrinsically safe apparatus enclosures and raceways, if of metal, shall be ___ the equipment grounding conductor.
connected to
In a hazardous location, Class I is a location that ___.
contains flammable gases
In a hazardous location, Division 2 is a location that ___.
contains hazards that exist during abnormal operations
In a hazardous location, Class III is a location that:
contains ignitable fibers or flyings
Any motor application shall be considered at ___ unless the nature of the apparatus it drives is such that the motor will not operate continuously with load under any condition of use
continuous duty
Tamper-resistant receptacles are not required in ___.
correctional facilities
Switches, circuit breakers, motor controllers, and fuses in Class III, Division 1 locations shall be provided with ___ enclosures.
dusttight
Refer to Figure 210.19. If the incoming service is 120/208, the NEC® permits the panelboard to be rated for ___ volts.I. 250 II. 600
either I or II
The value of branch-circuit selection current will always be ___ the marked rated-load current.
equal to or greater than
Sealing compound is employed with mineral-insulated cable in a Class I location for the purpose of ___.
excluding moisture
Except for listed explosionproof equipment with factory threaded entries, all National Standard Pipe Taper threaded conduit entries into explosionproof equipment and threaded in the field shall have at least ___ threads fully engaged.
five
The receptacle, shown at II in Figure 211.9, will be installed in a metal box. The box will be connected to the panelboard with PVC. The minimum number of conductors that are required to be pulled into the PVC is ___.
four
Ampacity of fixture wire is determined ___.
from a table in Table 402.5 of the Code
Among the receptacles shown in Figure 112.231, ___ is a hospital-grade receptacle.
green dot opn putlet
For lighting circuits, NEC® Section 404.2(C) requires a(n) ___ conductor to be provided in each switch box or enclosure.
grounded
A(n) ___ refrigerant motor-compressor is a combination compressor and motor in the same housing, having no external shaft or shaft seals, with the motor operating in the refrigerant.
hermetic
A receptacle with a green dot on an ivory face would be a(n) ___ receptacle.
hospital grade
An individual disconnecting means shall be provided for each controller and shall disconnect the controller. The disconnecting means shall be located ___ the controller location.
in sight from
When an equipment grounding conductor is installed with an underground circuit to a dairy, the equipment grounding conductor is required to be ___.
insulated
A cover that maintains the weatherproof integrity of the receptacle ___ to be installed when an outdoor receptacle is used for the permanent connection of a cord from a lawn sprinkler system.
is required
Where ___ is/are used for intrinsically safe system wiring, bonding at all ends of the raceway, regardless of the location, shall be required.
metal raceways
The secondary circuits of wound-rotor ac motors, including conductors, controllers, resistors, and so forth, shall be permitted to be protected against overload by the ___.
motor-overload device
In assembly occupancies, which of the fixed wiring methods are not permitted?
nonmetallic raceways
A motor is installed as part of a factory-wired piece of equipment. It is required to be grounded, and no additional connections are required at the motor terminal housing during the equipment installation. A separate means for motor grounding at the motor terminal housing shall ___.
not be required
Three-way and four-way switches shall be wired so that all switching is done ___.
only in the ungrounded circuit conductor
Which of the following materials is outside the scope of Zone 0, 1, and 2 classifications?
pyrophoric
For one-family or two-family dwellings, a disconnecting means or its remote control for a stationary battery system shall be located at a(n) ___ location outside the building.
readily accessible
Flexible cords and cables shall NOT be ___.
run through holes in walls
Receptacles on construction sites ___.
shall not be installed on any branch circuit that supplies temporary lighting
Receptacles located within the patient rooms, bathrooms, playrooms, activity rooms, and patient care areas of pediatric units shall be listed tamper resistant or shall employ a listed ___ cover.
tamper resistant
Class II locations are those that are hazardous because of ___.
the presence of combustible dust
Rooftop decks on recreational vehicles must have at least one receptacle installed within the perimeter of the rooftop deck when ___.
the rooftop deck is accessible from the inside of the recreational vehicle
Type SO cord has ___ insulation.
thermoset
In a 3Ø switchboard that has horizontal busbars, the AØ feeder conductor is connected to the ___ busbar.
top
Each patient bed location in critical care areas shall be supplied by at least ___ branch circuits.
two
In an enclosed (paint) spray booth, where automated spray application equipment is used, the area outside the access doors shall be ___ provided the door interlock prevents the spray application operation when the door is open.
unclassified
In general, switches shall be so wired that all switching is done in the ___ conductor.
ungrounded
Three-way and four-way switches shall be wired so that all switching is done only in the ___ conductors.
ungrounded
A plug with a two-foot-long cord is permitted for a ___.
waste disposer
At a carnival, portable termination boxes installed outdoors, shall be of weatherproof construction and mounted so that the bottom of the enclosure is not less than ___ above the ground.
6''
X-Ray equipment shall have a disconnect that is ___.
operable from a readily accessible location
When sizing the branch-circuit short-circuit and ground-fault protection for a three-phase DC motor you would use Table ___.
430.247
Which of the following is not required on a motor nameplate?
watts
A patient care space is a space of a health care facility where:
Examination of a patient occurs
A typical material in Group ___ would be flour.
G
Which cable is not allowed to be used above a Class I location in a commercial garage?
IGS
In a hazardous location, Class I is a location that:
contains flammable gases
