Study for Electrical Certification Exam, California

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  • Cable treated as 1 conductor can take up to _____% of the cross sectional area of a raceway.

    53%

    One conductor can take upt o _____% of the cross sectional area of a raceway

    53%

    Two conductors can take up to _____% of the cross sectional area of a raceway

    53%

    Three or more conductors can take up to ____% of the cross-sectional area of a raceway.

    40%

    Nipple: One or more conductors can take upt o _____% of the cross sectional area of a nipple.

    60%

    When all the conductors are the same size, the number of conductors in a raceway can be determined by looking at the tables located in ________

    Annex C

    Annex C does not have a table for liquid tight flexible nonmetallic conduit of the _____ type

    black

    How many no. 14 RHH conductors can be installed in 1 inch electrical metallic tubing?

    16

    How many compact No. 6 XHHW conductors can be installed in a 1 ¼ inch nonmetallic tubing?

    10

    If 1 ¼ inch flexible metal conduit has three THHN conductors (not compact) what is the largest conductor permitted to be installed.

    1

    How many 4/0 RHH conductors (without outer cover) can be installed in 2 inch intermediate metal conduit?

    3

    How many No. 18 TFFN conductors can be installed in a ¾ inch liquidtight flexible metallic conduit?

    39

    Chapter 9, Table ____ can be used when calculating the cross-sectional area of insulated conductors

    5

    Chapter 9, Table ____ can be used when calculating the cross-sectional area of bare conductors.

    8

    When conduit or tubing does not exceed _____ inches in length, it is called a nipple.

    24

    The cross sectional areas of conduit and tubing can be found in Table _____ of Chapter 9.

    4

    What is the total cross-sectional area of 1 ¼ inch rigid metal conduit ?

    1.526 inches

    What is the cross -sectional area for one No. 12 RHW conductor with outer cover?

    .0353 sq. inch

    What is the cross-sectional area for one No. 10 RHH without an outer cover?

    .0333 sq. inch

    What is the cross-sectional area in square inches for one No. 10 bare solid conductor?

    .008 sq. inch

    What is the alternating current resistance of No. 1/0 copper installed in a metal conduit? Conductor length 1000 feet.

    .12 ohm

    Raceway and Nipple Calculations: Tables are not useful to determine raceway sizing if conductors are of different sizes. What are the three steps for determining raceway and nipple size.

    Step 1) cross sectional area of each conductor. Step 2) Cross sectional area for all conductors. Step 3) Size the raceway according to percent fill.

    Raceway Size: A 400 amp feeder is installed in schedule 40 rigid nonmetallic conduit. This raceway contains three 500 kcmil THHN conductors, one 250 THHN conductor and one No. 3 THHN conductor. What size raceway is required for these three conductors?

    3 inch

    Nipple Size: What size rigid metal nipple is required for three NO. 3/0 THHN conductors, one No. 1 THHN conductor, and one No. 6 THHN conductor?

    1 ½ inch

    Existing Raceway Calculations: What are the three steps to determine raceway cross-sectional spare space area?

    Step 1) Determine raceways cross-sectional area for conduit fill Tables 1 and 4, Chapter 9. Step 2) Determine the area of the existing conductors. Step 3) Subtract the cross-sectional area of the existing conductors from the area of permitted conductor fill.

    Existing Raceway Calculations, Part 2: What are the two steps to determine the number of conductors permitted in spare space area?

    Step 1) Determine the cross-sectional area of conductors to be added. Step 2) Divide the spare space area by the conductors cross-sectional area.

    Spare Space Area: An existing one inch liquidtight flexible metal conduit contains two No. 12 THW conductors, two No. 10 THW conductors, and one No. 12 bare (stranded). What is the area remaining for additional conductors?

    .2636 for conduit and .4386 for a nipple

    Conductors in Spare Space Area: An existing 1 inch EMT contains two No. 12 THHN conductors, two No. 10 THHN conductors, and one No. 12 bare stranded conductors. How many additional No. 8 THHN conductors can be added to this raceway?

    7 if raceway is more than 24 inches long, 12 if raceway is 24 inches long or less.

    When all conductors are the same size, Table _______ can be used to determine the number of conductors permitted in the outlet box, or determine the size outlet box required for the given number of conductors

    314-16a

    Outlet Box Size: What size outlet box is required for six No. 12 THHN conductors, and three No. 12 THW conductors?

    9

    Number of Conductors in an Outlet Box: Using Table 314-16a, how many No. 14 THHN conductors are permitted in a 4 x 1 ½ round box?

    7

    Box Fill Requirements: Each conductor that originates outside the box and terminates or is spliced within the box is considered as ____ conductor.

    1

    Box Fill Requirements: Each conductor that runs through the box is considered as _____ conductor.

    1

    Box Fill Requirements: Fixture wires smaller than NO. 14 from a domed fixture or similar canopy are considered as ______ conductor

    0

    Box Fill Requirements: One or more internal cable clamps are considered as _____ conductors based on the ____ conductor that enters the box

    1, largest

    Box Fill Requirements: One or more fixture studs or hickeys within the box are considered as ____ conductors based on the _____ conductor that enters the box.

    1, largest

    Box Fill Requirements: Each yoke or strap containing one or more devices or equipment is considered as ____ conductors, based on the ______ conductor that terminates on the yoke.

    2, largest

    Box Fill Requirements: One or more grounding conductors are considered ____ conductor based on the ____ grounding conductor that enters the box.

    1, largest

    Box Fill Requirements: Wirenuts, cable connectors, raceway fittings and conductors that originate and terminate within the outlet box (such as equipment bonding jumpers and pigtails) are considered _____ conductor .

    0

    What size outlet box is required for 14/3 type NM cable (with ground) that terminates on a switch, with 14/2 NM cable that terminates on a receptacle, if the box has internal cable clamps factory installed?

    4 x 2 1/8 square

    A round 3 x 1 ½ box has a volume of 6 cubic inches and has factory internal cable clamps. Can this pancake box be used with a lighting fixture that has a domed canopy? Thee branch circuit wiring is 14/2 NM sheath cable and a paddle fan has three fixture wires and one ground wire all smaller than No. 14

    No

    Conductors Added to Existing Box: How many No. 14 THHN conductors can be pulled through a 4 x 2 ½ square box that has a plaster ring 3.6 cubic inches? The box already contains two receptacles, five No. 12 THHN conductors, and one No. 12 bare grounding conductor.

    5

    Pull Boxes, Junction Boxes and Conduit Bodies must be sized according to Section _____

    314.28

    Straight Pull Calculation (length of raceway): The minimum distance from where the raceway enters to the opposite wall must not be less than _____ times the trade size of the largest raceway.

    8

    Angle Pull Calculation (90 degrees, diameter of raceway) must not be less than ___ times the trade diameter of the largest raceway plus the sum of the diameters of the remaining raceways on the same wall of the box.

    6

    U-Pull Calculations: The distance from were the raceways enter to the opposite wall must not be less than _____ times the trade diameter of the largest raceway plus the sum of te diameters of the remaining raceways on the same wall.

    6

    Depth of Box and Conduit body sizing: When conductors enter an enclosure opposite a removable cover, such as the back of a pull box or conduit body, the distance from where the conductors enter to the removable cover should be calculated according to Table _____, one wire per terminal.

    312.6

    Depth of Pull or Junction Box: A 24" x 24" pull box has two 2 inch conduits that enter the back of the box with No. 4/0 conductors. What is the minimum depth of the box?

    4

    Pull Box Sizing, Horizontal Dimension: A junction box contains two 3 inch raceways on the left side and one 3 inch raceway on the right side. The conductors from one of the 3 inch raceways on the left are pulled through the 3 inch raceway on the right wall. The other 3 inch raceways conductors are pulled through ta raceway at the bottom of the pull box. What is the horizontal dimension of this box?

    24

    Pull Box Sizing, Vertical Dimension: A junction box contains two 3 inch raceways on the left side and one 3 inch raceway on the right side. The conductors from one of the 3 inch raceways on the left are pulled through the 3 inch raceway on the right wall. The other 3 inch raceways conductors are pulled through ta raceway at the bottom of the pull box. What is the vertical dimension of this box?

    18

    Pull Box Sizing, Distance between Raceways: A junction box contains two 3 inch raceways on the left side and one 3 inch raceway on the right side. The conductors from one of the 3 inch raceways on the left are pulled through the 3 inch raceway on the right wall. The other 3 inch raceways conductors are pulled through ta raceway at the bottom of the pull box. What is the minimum distance between the two three inch raceways that contain the same conductors (314-28a-2)?

    18

    Pull Box Sizing, Horizontal Dimension: A pull box contains two 4 inch raceways on the left and two 2 inch raceways on the top. What is the horizontal dimension of the box?

    28 inches

    Pull Box Sizing, Vertical Dimension: A pull box contains two 4 inch raceways on the left and two 2 inch raceways on the top. What is the vertical dimension of the box?

    14 inches

    Pull Box Sizing, Distance between Raceways: A pull box contains two 4 inch raceways on the left and two 2 inch raceways on the top. What is the minimum distance between the two 4 inch raceways that contain the same conductors?

    24 inches

    Understanding Chapter 9 Tables: When all the conductors are the same size and insulation, the number of conductors permitted in a raceway can be determined simply by looking at the Tables in ______.

    Annex C

    Understanding Chapter 9 Tables: When equipment grounding conductors are installed in a raceway, the actual area of the conductor must be used when calculating raceway fill. T/F

    T

    Understanding Chapter 9 Tables: When a raceway does not exceed 24 inches, the raceway is permitted to be filled to _____ of its cross-sectional area.

    60%

    How many NO. 6 RHH (without outer cover) can be installed in a 1 " nonmetallic tubing?

    4

    How many No. 1/0 XHHW can be installed in 2" flexible metal conduit?

    7

    How many #12 RHH (with outer cover) can be installed in 1" IMC raceway?

    11

    If we have a 2 inch rigid metal conduit and we want to install three THHN aluminum compact conductors, what is the largest aluminum compact conductor permitted to be installed?

    300kcmil

    The actual area of conductor fill is dependent on the raceway size and the number of conductors installed. If there are three or more conductors installed in a raceway, the total area of conductor fill is limited to _____ percent.

    40

    What is the area in square inches for a No. 10 THW?

    .0243

    What is the area in square inches for a No. 12 RHH (with outer cover)?

    .0353

    What is the area in square inches of a No. 8 bare solid?

    .013

    The number of conductors permitted in a raceway is dependent on _____(3 things)

    area of the raceway, percent area fill allowed, area of the conductors

    A 200 ampere feeder installed in rigid nonmetallic conduit schedule 80, has three No. 3/0 THHN, one No. 2 THHN, and one No. 6 THHN. What size raceway is required?

    3

    What size rigid metal nipple is required for three No. 4/0 THHN, one No. 1/0 THHN and one No. 4 THHN?

    1 ½ inch

    Existing Metal Raceways: An existing Rigid metal nipple contains four No. 10 THHN and one No. 10 (bare stranded) ground wire in a 1/2 inch metal conduit. How many additional No. 10 THHN can be installed?

    5

    What size square box is required for 6 No. 14 THHN and 3 No. 14 THW?

    4 x 1 ¼

    How many #10 THHN are permitted in a 4 x 1 ½ square box?

    8

    Table 314-16 does not take in to consideration the volume of _____.

    Devices, cable clamps, fixture studs or hickeys.

    It is permitted to omit one equipment grounding conductor and not more than ______ that enter a box from a fixture canopy.

    four No. 16 or No. 18 fixture wires

    Can a round 4 x ½ box marked as 8 cubic inches with manufactured cable clamps supplied with 14/2 NM be used with a fixture that has two No. 18 TFN and a canopy cover?

    Yes

    What size square outlet box is required for: one 12/2 NM cable that terminates on a switch, one 12/3 NM cable that terminates on a receptacle, and the box has manufactured cable clamps.

    4x2 1/8

    How many No. 14 THHN conductors can be pulled through a 4 x 1 ½ square box with a plaster ring of 3.6 cubic inches? The box contains two duplex receptacles, five No. 14 THHN and two grounding conductors.

    2

    When conductors enter an eclosure opposite a removable cover, the distance from where the conductors enter to the removable cover determined using Table _____ (1 terminal column)

    312.6(A)

    A junction box contains two 2 ½ inch raceways on the left side and one 2 ½ inch raceway on the right side. The conductors from one 2 ½ inch raceway are pulled through the raceway on the righ wall. The other 2 ½ inch raceway conductors (on the side) are pulled through a 2 ½ inch raceway at the bottom of the pull box. What is the distance from the left wall to the right wall?

    20 inches

    A junction box contains two 2 ½ inch raceways on the left side and one 2 ½ inch raceway on the right side. The conductors from one 2 ½ inch raceway are pulled through the raceway on the righ wall. The other 2 ½ inch raceway conductors (on the side) are pulled through a 2 ½ inch raceway at the bottom of the pull box. What is the distance from the bottom wall to the top wall?

    15 inches

    A junction box contains two 2 ½ inch raceways on the left side and one 2 ½ inch raceway on the right side. The conductors from one 2 ½ inch raceway are pulled through the raceway on the righ wall. The other 2 ½ inch raceway conductors (on the side) are pulled through a 2 ½ inch raceway at the bottom of the pull box. What is the distance from between the raceways that contain the same conductors?

    15 inches

    A junction box contains two 2 inch raceways on the left side and two 2 inch raceways on the top. What is the distance from the left to the right wall?

    14 inches

    A junction box contains two 2 inch raceways on the left side and two 2 inch raceways on the top. What is the distance from the bottom to the top wall?

    14 inches

    A junction box contains two 2 inch raceways on the left side and two 2 inch raceways on the top. What is the distance between the 2 inch raceways that contain the same conductors?

    12 inches

    A 3 inch schedule 40 PVC raceway contains seven No. 1 RHW conductors without outer cover. How many No. 2 THW conductors may be installed in this raceway with the existing conductors?

    11

    Determine the minimum cubic inches required for two No. 10 TW passing through a box, four No. 14 THHN terminating, two No. 12 TW terminating to a receptacle, and one No. 12 equipment bonding jumper from the receptacle to the box.

    22 cubic inches

    When determining the number of conductors in a box fill two No. 18 fixture wires, one 14/3 nonmetallic sheathed cable with ground, one duplex switch, and two cable clamps would count as ______ conductors.

    9

    If a 250kcmil wire is run through a 3 inch raceway entry in the wall opposite to a removable cover, the distance from that cover must not be less than _______.

    4 ½ inches

    Compliance with the provisions of the Code will result in _____. (Article 90)

    an electrical system free from hazard

    (Article 90) The Code applies to the installation of electrical conductors and equipment within or on public and private buildings, of outside conductors and equipment on the premises, and of optical fiber cable. (True,False)

    True

    (Article 90)Installations of communications equipment under the exclusive control of communications utilities located outdoors or in building spaces used exclusively for such installations ______ covered by the Code.

    Are not

    (Article 90)Explanatory material, such as references to other standards, references to related Sections of the Code or information related to a Code rule is included in the NEC in the form of informational notes. (True/False)

    True

    (Article 90) Plans and specification that provide ample space in raceways, spare raceways, and additional spaces will allow for future increases in the use of electricity. Distribution centers located in readily accessible locations will provide convenience and safety of operation. (True/False)

    True

    (Article 100) A junction box above a suspended ceiling that has removable panels is considered to be _______.

    Accessible

    (Article 100) Acceptable to the authority having jurisdiction means that the equipment has been _____.

    Approved

    (Article 100) According to the Code, automatic is self-acting, operating by its own mechanism when actuated by some impersonal influence such as change in current strength, mechanical configuration, temperature. (True/False)

    True

    ____ branch circuits supply energy to one or more outlets to which appliances are to be connected.

    Appliance

    For a circuit to be considered a multiwire branch circuit, it must have two or more ungrounded conductors with a potential difference between them, a grounded conductor having equal potential difference between it and each ungrounded conductor of the circuit, and a grounded conductor connected to the neutral (grounded) conductor of the system.(True/False)

    True

    A qualifying term indicating that there is a purposely introduced delay in the tripping action of the circuit breaker, which delay decreases as the magnitude of the current increases, is defined by the Code as a _____ circuit breaker.

    Inverse time

    A separate portion of a conduit or tubing system that provides access through a removable cover(s) to the interior of the system at a junction of two or more sections of the system or at a terminal point of the system is defined as a(n)

    Conduit body

    A device or group of devices that serves to govern in some predetermined manner the electric power delivered to the apparatus to which it is connected is a ________

    Controller

    A unit of an electrical system, which is intended to carry, but not utilize electrical energy. Is a______.

    Device

    So constructed that dust will not enter the enclosing case under specified test conditions is known as _____.

    Dusttight

    A two-family dwelling unit, such as a duplex apartment, is considered a single family dwelling. (True/False)

    False

    An apparatus enclosed in a case that is capable of withstanding an explosion of specified gas or vapor that may occur within it, and of preventing the ignition of a specified gas or vapor surrounding the enclosure by sparks, flashes, or explosion of the gas or vapor within, and that operates at such an external temperature that a surrounding flammable atmosphere will not be ignited is defined as _____.

    Explosion-proof

    The 2011 NEC defined ______ as all conductors between a source of power from a battery, a solar voltaic system, generator, transformer, or converter windings, and the final branch circuit overcurrent protections device(s).

    Feeder

    A system or circuit conductor that is intentionally grounded is a(n)_____ This conductor is often called a neutral conductor in the field, and is identified with the color white or gray.

    Grounded conductor

    A system intended to provide protection of equipment from damaging line-to-ground-fault currents by operating to cause a disconnecting means to open all ungrounded conductors of the faulted circuit is defined as _____.

    Ground-fault protection of equipment

    The highest current at rated voltage that a device is intended to interrupt under standard test conditions is the ______.

    Interrupting rating

    An outlet intended for the direct connection of a lampholder, a lighting fixture, or a pendant cord terminating in a lampholder is a(n) _____.

    Lighting outlet

    A ______ location may be temporarily subject to dampness and wetness.

    Dry

    A(n) ______ is a point on a wiring system where current is taken to supply equipment that uses electricity.

    Outlet

    A single panel or group of panel units designed for assembly in the form of a single panel is called a _______

    panelboard

    An enclosure or device so constructed that a beating rain will not enter is _______.

    Raintight

    Equipment enclosed in a case or cabinet that is provided with a means of sealing or locking so that live parts cannot be made accessible without opening the enclosure is said to be _______.

    Sealable

    Service conductors only originate from the service point and terminate at the service equipment (disconnect). Conductors supplied from back-up generators, battery UPS systems, transformers, etc., are considered "feeders".

    True

    The necessary equipment, usually a circuit breaker or switch and fuse and their accessories, intended to constitute the main control and cutoff of the supply is referred to as _____.

    Service equipment

    A signaling circuit is any electric circuit that energizes signaling equipment. (True/False)

    True

    A _____ switch is a manually operated device used in conjunction with a transfer switch to provide a means of directly connecting load conductors to a power source and of disconnecting the transfer switch.

    Bypass isolation

    A thermal protector may consist of one or more heat-sensing element integral with the motor or motor-compressor and an external control device.(True/False)

    True

    A value assigned to a circuit or system for the purpose of conveniently designating its voltage class such as 120/240 volts is called ______voltage.

    Nominal

    In judging equipment, considerations such as mechanical strength and arcing effects should be evaluated(True/False)

    True

    Conductors larger than No. 4/0 are measured in _____.

    Circular mils

    Equipment intended to break current at other than fault levels shall have an interrupting rating at system voltage sufficient for the current that must be interrupted.(True/False)

    True

    Circuit protective devices are used to clear a fault without the occurrence of extensive damage to te electrical components of the circuit. This fault shall be assumed to be either between two or more of the _____ or between any circuit conductor and the grounding conductor or enclosing metal raceway.

    Circuit conductors

    Equipment approved for use in dry locations shall be protected against permanent damage from the weather during _____.

    Building construction

    The Code prohibits damage to the internal parts of electrical equipment by foreign material such as paint, plaster, cleaners, etc. Precautions must be taken to provide protection from the detrimental effects of paint, plaster, cleaners, etc. on the internal parts of ______ and ______.

    Panelboards, receptacles

    Connection of conductors to terminal parts shall ensure a thoroughly good connection without damaging the conductors and shall be made by means of solder lugs, pressure connectors, splices to flexible leads. (True/False)

    True

    The temperature rating associated with the ampacity of a _____ shall be so selected and coordinated so as to not exceed the lowest temperature rating of any connected termination, conductor, or device.

    Conductor

    Design B, C, D, or E motors shall be wired with conductors having an insulation rating of at least _____ degrees C, and the conductor shall be sized based on the 75 degree C ampacity as ed in Table 310-15(B)(16) (formerly 310-16)

    75 degrees C

    The NEC required series-related installations to be field-marked to indicate the maximum level of fault-current for which the system has been installed.

    True

    Working space distances shall be measured from the _____ of equipment or apparatus if such are enclosed

    opening.

    Concrete, brick, or tile walls shall be considered as _____, as it applies to working space requirements.

    Grounded.

    The working space in front of the electric equipment shall not be less tha _____ inches wide or the width of the equipment, whichever is greater.

    30

    When normally enclosed live parts are exposed for inspection or servicing, the working space, if in a passageway or general open space, shall be suitably _____.

    Guarded

    The minimum headroom of working spaces about motor control centers shall be _____.

    6'6"

    Ventilated heating or cooling equipment (including ducts) that service the electrical room or space cannot be installed in the dedicated space above a panelboard or switchboard. (True/False)

    True

    To guard live parts over 50 volts but less than 600 volts, the equipment can be isolated in a room accessible to qualified persons only, located on a balcony, or elevated 8 feet or more above the floor (True/False)

    True

    Entrances to rooms and other guarded locations containing exposed live parts shall be marked with conspicuous ____ forbidding unqualified persons to enter.

    Warning signs

    Openings in ventilated dry-type _____ or similar openings in other equipment over 600 volts shall be designated so that foreign objects inserted through these openings will be deflected from energized parts.

    Transformers

    At least one entrance not less than 24 inches wide and 6 ½ feet high shall be provided to give access to the working space about electrical equipment that operates at over 600 volts, nominal. On switchboard and control panels exceeding 6 feet in width, there shall be one entrance at each end of such equipment, except where the work space required in Section 110.34(a) is doubled (True/False)

    True

    Where switches, cutouts or other equipment operating at 600 volts nominal, or less are installed in a room or enclosure where there are exposed live parts or exposed wiring operating at over 600 volts, nominal, the high-voltage equipment shall be effectively separated from the space occupied by _____ by a suitable partition, fence, or screen.

    The low voltage equipment.

    Warning signs for over 600 volts shall read "Warning - High Voltage - Keep Out". (True/False)

    False

    Article 200 contains the requirements for the identification of terminals, grounded conductors in premises wiring systems, identification of grounded conductors. (True/False)

    True

    An insulated grounded conductor of No. ____ or smaller shall be identified by a continuous white or natural gray outer finish along its entire length.

    6

    When different wiring systems are in the same raceway or enclosure, the grounded conductor of one system can be white and the grounded conductor of the other system can be gray (True/False)

    False

    Identification of the grounded conductor terminal on a device shall be by a metal or metal coating substantially white in color or the word ______ located adjacent to the identified terminal.

    White

    (210)Multiwire branch circuits shall supply only line to _____ loads

    neutral

    (210)Each system _____ conductor, wherever accessible, shall be identified by a separate color coding, marking tape, tagging, or other equally effective means. This applies to multiwire branch circuits when there Is more than one system voltage in a building.

    Ungrounded

    (210)Receptacle and cord connectors having grounding terminals must have those terminals effectively _______.

    Grounded

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