Chapter 1 electrical year 2

Annex ___ in the NEC contains examples of load calculations for dwellings

D

The smallest copper service lateral conductors that can be installed for a service are ___ AWG.

8

Determine the minimum standard size wireway required for a job. A section of wireway is shown in Figure 208.62. Thirty-two 3 AWG, forty-eight 2 AWG, and eighteen 3/0 AWG THHN/THWN conductors will be installed in the wireway.

10" x 10"

Which of these power factors is the best?

100%

When plug fuses are used on all new installations such as in a disconnect switch for a clothes dryer, the fuses must be ___.

Type S

Each conduit, connected to the handy box shown above in Figure 208.31, will contain one "hot," one neutral, and one EGC. A duplex receptacle will be installed in the box. The shallowest handy box permitted for this installation is ___. All conductors are 14 AWG THHN/TH

21/8 inches deep

The 8-32 screws in an octagonal 4/0 box are permitted to support a luminaire provided the luminaire weight does not exceed ___ kg.

23

Underground service laterals that are installed as USE cable and covered with 36 inches of dirt shall also have a warning ribbon installed above the conduit at a maximum depth of ___ inches below finish grade.

24

Which of the following installations Are covered by the NEC?

None of the above

The maximum number of 3-pole circuit breakers used as service disconnects permitted in a 3Ø panelboard is ____.

6

The smallest service that can be installed on a barber shop is ___ Amps.

60

Chemical-specific information must always be ___ through labels and MSDS sheets.

available

For a single-family dwelling with six appliance load, demand factors may be applied to ___ of these loads using the standard calculation

All six

In commercial repair garages where electrical diagnostic equipment, electrical hand tools, or portable lighting equipment is used, GFCI protection is required for all ___ receptacles.

I. 125-volt, single-phase, 15 and 20-ampere II. 250-volt, single-phase, 30-ampereIII. 250-volt, three-phase, 15- and 20-ampere

Which of the following safety switches is (are) permitted to be used as the disconnecting means for a 240-volt, 1Ø water heater?

I. 250-volt, 2-pole II. 600-volt, 3-pole III. 250-volt, 3-pole

___ is a type of lamp used in an HID luminaire.

I. Mercury-vapor III. Nickel cadmium

A series circuit has both inductive and capacitive loads. The loads supply equal reactance to circuit current. Which of the following statements is true?

I. The current through each load is 180 degrees out of phase with the other.II. The inductive and capacitive currents add together with a net current of zero.

Some wire nuts are listed for direct burial underground

True

How much current can each conductor carry? Six, current-carrying 250 kcmil conductors are run in a pipe that is located in a 129°F ambient temperature location? The 75°C OCPD terminations are far away from the high temp area.

176

has a 175-amp main breaker. The conduit contains 2/0 conductors. The minimum size main bonding jumper is ___ AWG or kcmil.

4

A 100-gallon boiler is to be installed to supply hot water to the restrooms in an office building. The boiler is rated for 9.8 KW at 240 volts 1-phase. The minimum size of the boiler branch circuit breaker that can be installed in the panel is ___ amps.

60

Normally, AC power in the United States operates at ___ cps (cycles per second).

60

Impedance is represented by the letter ___.

Z

A location that is 9 feet from a liquefied natural gas dispenser enclosure is ___ location.

a Class I, Div 2

The Code reference for GFCI protection of receptacles in commercial garages is found at ___.

c. 511.12

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

The minimum clearance above finished grade for overhead service conductors is ___ feet. The service is 120/240-volt, 3-ph, 4-wire. The span is over the parking area adjacent to an office building. The driveway into the parking area has a metal bar hanging over the driveway. The bar is set at 8 feet above the driveway and prohibits the entrance of trucks. The service drop uses quadruplex.

12

Underground service laterals that are installed as direct buried cable and covered with 42 inches of dirt shall also have a warning ribbon installed at least ___ inches above the cable.

12

The overall length of a power supply cord for a mobile home, measured from the end of the cord, including bared leads, to the face of the attachment plug cap shall not be less than ___ feet and shall not exceed ___ feet.

21, 36.5

Among the sizes listed below, the damaged power cord on a 120-volt appliance can be replaced with a 6-ft length of flexible SJO cord not smaller than ___ AWG where the appliance is to be connected to a 15-A branch circuit.

14

A service is to be built on the base support pole of a single-sided billboard. One branch circuit provides power to the lights and will be loaded to 6 amps. The minimum ampacity for the ungrounded service conductors is ___ amps.

15

Amusement rides and amusement attractions shall be maintained not less than ___ feet in any direction from overhead conductors operating at 600 volts or less.

15

Where major repair garages service vehicles that are fueled by lighter-than-air fuels such as natural gas or hydrogen, the area within ___ of the ceiling shall be considered unclassified where ventilation of at least 1 cfm/ft2 of ceiling area is provided.

18 inches

A service lateral is to be installed as direct-buried cable in the bottom of a trench that is 42 inches below finish grade. The trench is to be filled with dirt only. A warning ribbon is required to be installed in the trench at a maximum depth of ___ inches below finish grade.

30

A feeder needs to be installed to supply power to a load that will draw 900 amps. The circuit breaker will be rated at 900 amps. There will be 3 parallel conduits run for the feeder. You will need to install at least ___ AWG or kcmil conductors in each conduit.

350

You are to install FMC between two equipment enclosures. You don't know how many or what size wires will have to be pulled into the flex. If you install the largest flex available this is trade size ___.

4

About ___% of OSHA's workforce consists of field inspectors (compliance officers).

50

In a circuit with 25 ohms resistance and 50 ohms capacitive reactance, the impedance is ___ .

55.9017

You are to surface-mount 39' of 12-2 MC cable on a wall between two boxes as shown above in Figure 208.11. You will use 1-hole straps to securely fasten the cable to the wall. The minimum number of straps required is ___.

8

The discovery that charged bodies attract or repel each other is called ___.

Coulomb's Law of Charges

Article 300 applies to wiring that is part of equipment.

False

Grounded conductors shall never be permitted to be opened by switches.

False

Luminaires (such as "down lights") that are recessed in a grid-type ceiling are required to be secured to the building structure, according to the NEC ®.

False

Is the amount of electricity required at a given time

Demand

"S" loops ___ allowed for ground movement where service lateral conductors emerge from an underground raceway adjacent to a pad-mounted transformer.

are

Luminaires more than 2.3 m (71/2 ft) above the floor and switches located outside of the patient vicinity ___.

are not required to be grounded by an insulated equipment grounding conductor

A(n) ___ is any number of conductive wires, wound in loops, which rotate through a magnetic field.

armature

Instantaneous-trip circuit breakers can be installed _

as a part of listed combination with a motor controller

Where compressed natural gas dispensers are located under a canopy or enclosure that prevents the accumulation or entrapment of ignitible vapors, electrical equipment ___.

shall not be required to meet Class I, Division 2 hazardous location requirements

In a run of conduit, when couplings and connectors are loose this will ___ the amount of time required for a circuit breaker to open when a short-circuit occurs.

have no effect on

When spray application equipment cannot be operated unless the exhaust ventilation system is operating and functioning properly and spray application is automatically stopped if the exhaust ventilation system fails the system is said to be ___.

interlocked

Employee training shall include the ___ and observations that may be used to detect the presence or release of a hazardous chemical in the work area.

methods

A steel plate is required to protect ___ where it is installed through wooden framing members. A 1 inch clearance from the edge of the framing member can NOT be maintained

neither I nor II nor III

An atom with an equal number of protons and electrons is said to be electrically ___.

neutral

Impedance is measured in ___.

ohms

Inductive reactance is measured in ___.

ohms

Service equipment is the "point of division" between the ___ and ___.

supply (line) side, load side

Any equipment that is installed between the utility supply and the service overcurrent protective device(s) is on the ___ side of the service.

supply (or line)

A grounding conductor that is installed in a conduit with circuit conductors carries current ___.

when a ground fault occurs

The peak-to-peak value of a sine wave is ___ the maximum positive peak value.

twice

In a 30-foot run of conduit containing one conductor the maximum cross-sectional area that can be occupied by the conductor is ___ %.

53

The phase angle of a circuit is 28 degrees. The power factor is ___%.

88.3

The power factor for a load is ___% where true power = 11 kW & apparent power = 12 kVA.

91.7

Which of the flexible cables or cords listed below could be used to connect a piece of equipment that operates at 480 volts 3-ph?

. SEO

A written Haz Com program requires a list of chemicals known to be present in the workplace, and the methods the employer will use to inform the employees of these hazards.

. True

According to the NEC ® an 8 AWG bare solid copper conductor has a cross-sectional area of ___ square inches.

.013

Refer to Figure 207.14. The wiring method is RMC. The minimum distance permitted beneath the sidewalk at Point A (from the bottom of the 4" thick sidewalk to the top of the conduit) is ___ inches.

0

The primary purpose of bonding metal equipment enclosures, metal raceways, and the grounded power supply together is to ___.

I. cause the quick operation of OCPDs

4 AWG conductors can be spliced inside an LB type conduit body using ___.

I. crimp connectors II. screw-type splice connectors III. wire nuts

Do not use a ladder that is ___.

I. defective II. set up improperlyIII. broken

Compared to Schedule 80, Schedule 40 PVC ___.

I. has a thinner wall thickness III. has a larger cross-sectional area for fill purposes

Which of the following is (are) measured in ohms?

I. inductive reactance (X L) II. impedance (Z) III. capacitive reactance (X C) IV. resistance (R)

Listing and labeling information included with panelboards and switchboards contains information regarding the correct ___ of the equipment.

I. inspection II. mounting

Apparent power can be ___ true power.

I. more than II. equal to

Employers shall ensure that labels on incoming containers of hazardous chemicals are not ___.

I. removed III. defaced

Power is measured in ___.

I. watts II. volt-amperes

Refer to Figure 208.36. Which industrial cover/box combination will NOT violate the NEC®? All the conductors are 12 AWG. I. 4 × 11/2 square with 5.0 in3 industrial cover II. 411/16 × 11/4 square box with a 4.2 in3 industrial cover III. 4 × 21/8 square box with a 3.6 in3 industrial cover

II & III only

Which of the following 2-inch raceways has the smallest cross-sectional area?

Schedule 80 PVC (nonmetallic conduit)

All fixed wiring in an aircraft hanger, but not installed in a Class 1 location shall be installed in metal raceways or shall be Type MI, ______ , or MC cable.

TC

Class A GFCI devices (those currently manufactured) are designed to operate when the ground fault current flow is between 10 mA and 15 mA.

false

In a panelboard, 8 AWG feeder conductors are connected to a 2-pole, 50-amp circuit breaker. The feeder conductors enter a pull box where several other conductors are connected to them. If 8 AWG conductors are connected to the feeder, the 8 AWG conductors are ___.

feeders

Rigid Metal Conduit (RMC) is generally made of galvanized steel or aluminum. Galvanized steel is considered to be a ___ metal.

ferrous

Capacitors in parallel add like resistors in ___.

series

Service entrance conductors are protected against ___ currents.

overload

True Power is the power used in a circuit by purely ___ loads or components of a circuit.

resistive

In a purely resistive circuit, current is said to ___ the applied source voltage.

be in phase with

The service entrance conductors are connected to a 200-amp fused safety switch. The switch supplies power to MLO Panel HD-1. Panel HD-1 has feed-through lugs and supplies power to MLO Panel HD-2. Panel ___ is a subpanel. MLO is the designation for Main Lugs Only.

both HD-1 & HD-2

A switch is a device with a ___ rating.

both a and b

In a 3Ø switchboard that has horizontal busbars, the CØ feeder conductor is connected to the ___ busbar.

bottom

The authority having jurisdiction has the responsibility

For enforcing the NEC, For approving equipment installations, also for granting special permission

___-grade receptacles are the highest grade receptacles manufactured by the electrical industry.

Hospital

Any spray area in direct path of spray operations is considered to be a ___ location. I. Class I, Zone 1 II. Class II, Division 1III. Class I, Zone 0

I or II only

In aircraft hangars where electrical diagnostic equipment, electrical hand tools or portable lighting equipment are used, GFCI protection is required for all ___ receptacles.

I. 125-volt, single-phase, 15 and 20-ampere II. 250-volt, single-phase, 30-ampere III. 250-volt, three-phase, 15- and 20-ampere

Where covered with stabilized sand to prevent physical damage, Type ___ cable is permitted to be directly buried in a trench underground.

I. UF II. MI

A circuit breaker panel is permitted to be installed in which of the following locations?

I. a restroom in an office building II. a mechanical room in a hospital

Where a luminaire is listed for installation in a damp location, it can be installed in a ___ location.

II. dry III. damp

Annex H in the NEC

Is to used for information on unless specifically adopted by the local AHJ

A 4 square box (1900) with a 1-gang plaster ring is to be flush mounted behind a sheetrock wall for a receptacle. 1/2" FMC will be installed in the wall and connected to the box. Does the NEC® permit a 90° flex connector to be used at the box? Select one:

No

A customer wants to install 120-volt track lighting on the wall 2 feet above a countertop. The top of the countertop is 32 inches AFF. Does the NEC® permit this installation?

No

A switch box is fed with 12-2 MC. FMC ("flex") feeds an H/V/L/NL from the switch box and contains 1 "hot," 3 "switch-legs" and 1 neutral. A 2-gang, 21/2-inch-deep masonry box will be used and will contain the two "dougle or stack switches" shown in Figure 124.104. Will this violate the NEC®? Remember: A "dougle or stack" switch is two, single-pole switches that are mounted on one yoke (mounting strap).

No

Does the NEC ® permit a breaker to be mounted in a breaker enclosure such that to turn the breaker "ON" you pull the breaker handle down?

No

NFPA 70E rules are used by ___ to support citations relating to electrical hazards.

OSHA

Electrical wiring that is installed in and under aircraft hangar floors shall comply with the requirements for a ___ location.

c. Class I, Division 1

For the calculations required in article 220, the total area of an occupancy is determined from the __ dimensions of the building or structure

Outside

In a repair garage, which function does not constitute a minor repair

Painting

Switches, circuit breakers, motor controllers, and fuses in Class III, Division 1 locations shall be provided with ___ enclosures

dusttight

RMS means ___.

Root Mean Square

Refer to NEC 500.8 generally, equipment for use in hazardous locations shall be marked to show the environment for which it has been evaluated. Equipment that is not marked to indicate a division or is marked as division 1 is ____

Suitable for both divisions 1 and 2

The three most common types of permanent magnets include all except ___.

electromagnets

There are ___ chapters in the 2015 edition of NFPA 70E.

four

Standard lighting track shall not be equipped with

general-purpose receptacles

When two like-charged bodies are brought together, their magnetic fields will work to ___ them.

repel

Typically, OCPDs are connected in ___ with the circuit conductors.

series

In temporary installations, receptacles shall not be connected to the same ungrounded conductor of multiwire circuits that supply ___.

temporary lighting

The amount of current that flows in any circuit is determined by the voltage and resistance of the circuit.

true

___ power is power consumed by a resistor, dissipated as heat, and not returned to the generation source.

true

Where lubrication and vehicle servicing is done at minor repair garages, the space below the floor level in a ventilated pit shall be ___. Exhaust ventilation is provided at a rate of not less than 0.3 m3/min/m2 (1 cfm/ft2) of floor area at all times that the building is occupied.

unclassified

A unit switch is the ON/OFF switch on an appliance that disconnects all ___ conductors.

ungrounded

Safety data sheets must be readily accessible when employees are in their ___.

work area

Written Energized Electrical ___ are required if live parts can not be put in an electrically safe condition.

work permits

The purpose of OSHA is to assure safe and healthful ___ conditions.

working

Employers shall maintain in the ___ copies of the required MSDS sheets for each hazardous chemical.

workplace

In a class II location, ventilating pipes for generators shall be of metal not less than ___ inches in thickness or of equally substantial noncombustible material.

.021 in

Five isolated ground 120-volt receptacles are to be supplied power from a 120/240-volt, 1Ø, 3-wire panelboard. Each receptacle is on a dedicated (individual) branch circuit. You installed one metal conduit and will connect the ungrounded conductors to breakers 2, 4, 6, 8, & 10. Per the NEC ®, the fewest number of grounding conductors you can install in the conduit is ___.

1

According to Table 4 in the NEC 2-inch FMC has a total area of 4.909 in2. A 12' run of this flex can be filled with conductors for several circuits. However, the maximum area that can be occupied by the circuit conductors is __ sq. in.

1.963

What is the smallest size copper wire permitted to be used as a main bonding jumper in a 400-A main breaker panelboard? The panel is fed from a transformer a single conduit containing four 500kcmil conductors.

1/0 AMG

The smallest trade size EMT available that can be installed between two big pull boxes is ___.

1/2

For lighting circuits in a recreational vehicle, switches shall be rated not less than ___ amperes, 120-125 volts and in no case less than the connected load.

10

The largest solid wire that can be installed in a run of EMT as branch circuit conductors is ___.

10

What size branch circuit THWN copper conductors must be installed to supply a 4,500-watt, 240-volt baseboard heater?

10 AWG

Where operating in the United States, AC voltage reaches 0 volts ___ times during 1 second.

120

You are to surface mount 128' of EMT on a wall between two boxes as shown above in Figure 208.11. You will use 1-hole straps to securely fasten the EMT to the wall. The minimum number of straps required is ___.

14

A listed appliance is manufactured with a 16 AWG flexible power cord that is used for connection to a receptacle. The nameplate on the appliance contains the information: "Maximum 15 A". This appliance is considered to be protected by a 15-amp branch circuit breaker.

True

The cord exposed usable length measured to the point of entry on the vehicle exterior, for connecting a recreational vehicle to the power supply shall be a minimum of ___ feet where the point of entrance is at the side of the vehicle.

25

Locations within ___, in all directions, from a liquefied natural gas dispenser enclosure are classified as Class I, Division 2 locations.

3 m (10 ft)

Where above ground exterior branch circuit conduits enter a building, the conduit is required to be sealed " to prevent condensation" per ___ in the NEC®.

300.7(A)

The maximum number of 2/0 AWG THHN/THWN conductors that can be installed in a 6" x 6" wireway is ___. A section of wireway is shown in Figure 208.61.

32

The calculated minimum height (top-to-bottom) of the pull box shown in Figure 208.53 is ___ inches. The conduits considered for this calculation contain conductors that enter this side and exit the adjacent side.

33

For the pull box shown in Figure 208.52, the minimum calculated width is ___ inches. All conductors enter the bottom and exit the right side of the box.

33 1/2

The minimum branch-circuit rating for an individual branch circuit that is used to supply a fastened-in-place appliance is ___ amps. The marked rating (equipment nameplate) on the appliance is 35 A. The appliance is not continuously loaded.

35

In a 3Ø, 4-wire branch circuit where one neutral is "shared" among all three "hots," it is possible for the neutral to carry more current than any one ungrounded conductor. The circuits serve nonlinear loads.

True

Magnetism can be used to produce electric current.

True

Temporary magnets lose their magnetism as soon as the magnetizing force is removed.

True

The neutral of an electrical system is always carrying the unbalanced current of that system

True

Written Haz Com programs shall describe how the labels and other forms of warning, SDS sheets, and employee information and training will be met.

True

Which of the following are permitted to be buried in a trench underground? The wiring will be covered with stabilized sand to prevent physical damage.

Type MI cable

A switch box is fed with 12-2 MC. FMC ("flex") feeds an H/V/L/NL from the switch box and contains 1 "hot," 3 "switch-legs" and 1 neutral. A 2-gang, 21/2-inch-deep masonry box will be used and will contain the two "dougle or stack switches" shown in Figure 124.104. Will this violate the NEC®? Remember: A "dougle or stack" switch is two, single-pole switches that are mounted on one yoke (mounting strap).

36

A 120/240-volt, 1-ph, 3-wire service is to be run to serve 125-A, main breaker Panel B. As shown, one conduit will be installed for the service. The conduit will contain two 1 AWG conductors for the ungrounded conductors. Most of the loads are 240-volt, 1Ø phase without neutrals. The smallest MBJ that can be installed in Panel B is a ___ AWG.

6

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"

Where operating in the United States, AC voltage reaches a positive peak ___ times during 1 second.

60

For temporary wiring over ___ volts, nominal, suitable fencing, barriers, or other effective means shall be provided to limit access only to authorized and qualified personnel.

600

A switch box, shown above in Figure 208.32, will contain a duplex receptacle and each of the connected conduits will contain 12 AWG THHN/THWN conductors (one "hot," one neutral, and one EGC). The shallowest switch box permitted for this installation is ___ mm deep.

90

Two lighting circuits are supplied from a multiwire branch circuit that originates in a 120/240 volt, 1Ø, 3-wire panelboard. Two, 20 Amp, 1-pole breakers are installed in spaces 22 & 24 for the multiwire circuit. Circuit 22 has 2600 watts of lights connected to it, and Circuit 24 has 2100 watts of lights connected to it. Somewhere in the circuit the "hot" from breaker 22 and the "hot" from breaker 24 touch together. Which of the following should happen to Circuit 22?

A short circuit will occur and the breaker will trip.

Which of the following conductor materials are recognized by the NEC

Aluminum, copper, copper-clad aluminum (all of these)

The "J" designation in any of the "S-type" flexible cords designates ___.

a junior size

Specific to temporary installations, how does the NEC® address protecting flexible cords and cables that run on sharp corners?

a. Sharp corners should be avoided.

___ power is the power required to supply both resistive and reactive components of a load or loads.

Apparent

To assure an electrically safe work condition when working on switchboards and panelboards, the power supplying switchboards or panelboards must be turned off and all ___ procedures must be followed.

a. lock-out b. tag-out c. deenergizing

Congress finds that personal injuries and illnesses arising out of work situations impose a substantial burden upon, and are a hindrance to, interstate commerce in the form of ___, and disability compensation payments.

a. medical expenses b. wage loss c. lost production

An emergency action plan should include a list of the ___ of persons who can provide additional information or explanation.

a. names b. titles c. contact information

A ___ is accessible from the front.

a. switchboard b. panelboard

An employer shall review an emergency action plan with employees ___

a. upon their initial assignment b. when the plan is first developed c. whenever the employee's responsibilities change d. whenever the plan is changed or modified

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

When ___ touch together, this is a ground fault.

an ungrounded circuit conductor and the metal conduit

When power is ___ a solenoid valve controlling the flow of water into a clothes washing machine the valve opens and allows water to flow.

applied to

Personal Protective Equipment shall be worn as ___ for the risks involved.

appropriate

NEC® Article 110.16 requires that switchboards, panelboards, and industrial motor control panels in other than dwelling occupancies that are likely to require examination, adjustment, servicing, or maintenance while energized shall be field marked to warn qualified persons of ___.

arc flash hazards

High (on the order of hundreds or thousands of amps) current levels are associated with _

b. short circuits c. ground faults

If TWO, individual, single-pole breakers are handle tied and used for a 1Ø, 240-volt circuit, ___.

both "hots" can be manually opened

A ___ is accessible from the front.

both a & b

Any room or location in which flammable anesthetics or volatile flammable disinfecting agents are stored, floor-to-ceiling shall be considered a ___ location.

Class 1 Division 1

In a hazardous locations, class 3 is a location that

Contains ignitable fibers or flyings

The illuminated marquee sign for a theatre would be considered to be a ___ load

Continuous

Chemical manufacturers and importers shall obtain or develop SDS sheets for each hazardous chemical they produce or import. These SDS sheets shall be written in ___.

English

Protection against __ is addressed by the requirements in the NEC

Fault currents effects, Thermal, Electric shock.

Where a 250 kcmil copper GEC is subject to physical damage, it ___.

can be run inside properly supported RMC

Tables and ___ are provided for use when Arc Flash studies have not been performed.

charts

Employers shall maintain any safety data sheets (SDS) for hazardous ___.

chemicals

In vertical conduit runs, such as up through a high-rise building, conductors made of copper have support requirements that are ___ than for aluminum conductors.

closer together

Time-delay fuses are also known as ___ fuses.

dual-element

The purpose of the Haz Com standard is to ensure that the hazards of all chemicals are ___, and that information concerning their hazards is transmitted to employees

evaluated

The circuit installed in a run of PVC conduit requires a 6 AWG equipment grounding conductor. However, a 12 AWG was installed instead. Using the 12 instead of the 6 AWG wire will ___ the amount of time required for a circuit breaker to open when a ground fault occurs.

increase

As current flow through a conductor increases, the magnetic field strength ___.

increases

A(An) ___ conductor can be used for a grounded conductor where it is installed in conduit with branch circuit conductors.

insulated

A capacitor is made up of a pair of conductive plates separated by a thin layer of ___ material.

insulating

Thirty feet of 3/8 inch rebar used to reinforce grade beams within a poured building slab ___ permitted to be used as a grounding electrode for a separately derived system or a service.

is not

The plans indicate that you should install a 200-Amp branch circuit in Schedule 40 PVC with a 6 AWG equipment grounding conductor. However you did not have any 6 AWG wire so you pulled in 12 AWG instead. Compared to the correct circuit (with the 6 AWG EGC) your circuit will take ___ time for the circuit breaker to open when a ground fault occurs.

more

Article 300 covers wiring that is factory installed in ___.

none of the above

In an AC circuit containing only inductance and/or capacitance, the opposition to current flow is called ___.

reactance

Temporary electric power and lighting installations shall be permitted during the period of construction, remodeling, maintenance, ___, or demolition of buildings, structures, equipment, or similiar activities.

repair

Panelboards supplied through transformers shall have their overcurrent protection located on the ___ side of the transformer.

secondary

A fault current calculation requires that the main breaker in a panelboard have an interrupting rating of 28kA. If all the branch breakers have 10kA interrupting ratings, this system is ___ rated.

series

All conductors of circuits are required to be ___ on circuits leading to or through dispensing or remote pumping equipment.

simultaneously disconnected

A bare conductor can be used for a grounding electrode conductor where it is installed between a service panel and a ground rod

true

Can a safety switch rated for 250 volts be used as the disconnecting means for a 208-volt circuit?

yes

The shallow masonry box, shown above in Figure 208.38, will contain two 4-way switches and one three-way switch. Conduit #1 contains five wires, #2 contains four wires, #3 contains four wires, and #4 contains two wires. All conductors are 12 AWG THHN/THWN and are spliced in the box or terminated on the switches. No separate EGCs are installed. Will this installation violate the Code?

yes

sine wave

60

A piece of equipment has a nameplate rating of 195 amps. The smallest wire that can be installed to serve this load where operated continuously is ___ AWG or KCMIL. The OCPD has terminations rated at 75°C.

250

A 100-gallon boiler is to be installed to supply hot water to the restrooms in an office building. The boiler is rated for 7.6 KW at 240 volts 1-phase. The circuit for the boiler originates in a 120/208-volt, 3Ø, 4-wire panelboard. The minimum size THHN/THWN copper wire that can be installed between the required disconnect switch and the boiler is ___ AWG. Don't forget to check the requirements of 240.4(D).

8

A change in the magnetic field surrounding the conductor induces a voltage in the conductor. This induced voltage is known as ___.

Counter EMF

___ is defined as case or housing of apparatus, or the fence or walls surrounding an installation to prevent personnel from accidentally contacting energized parts or to protect the equipment from physical damage.

Enclosure

___ materials, such as soft iron, can be easily magnetized.

Ferrous

When installing panelboards or switchboards, you must follow all manufacturer's installation requirements.

True

Circuit impedance (Z) consists of both the resistive and reactive components of a load.

True

For working or walking surfaces, the open sides of the upper levels shall be ___ to protect employees from falling to the lower levels.

guarded

Training must also include the physical and ___ hazards of the chemicals and the measures that employees can take to protect themselves from these hazards

health

A one-family dwelling has an initial net computed load of 9.5 kVA and five branch circuits. The minimum ampacity for the ungrounded, 120/240-volt, 3-wire service conductors is ___ amps.

100

Generally, the NEC® permits a circuit breaker to carry ___ percent of its rating where it supplies a load that is not operated for more than 3 hours.

100

The magnetic field around a conductor collapses (zero strength) ___ times per second when 60 Hz AC current is passing through the conductor.

120

The maximum surface temperature for motors in Class III locations shall not exceed ___ degrees Celcius.

120

A 208-volt, 1-ph piece of equipment is to be connected with SOO flexible cord. What is the smallest AWG size cord that can be used to connect the equipment? The maximum load on any one conductor is 17 amps.

14

Portable structures at a circus shall not be located under or within ___ feet horizontally of conductors operating in excess of 600 volts.

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

Where a 3600 watt, 240-volt load is supplied from a 2-pole, 30-amp breaker in a 120/240-volt, 1-ph, 3-wire panelboard each ungrounded conductor carries ___ amps.

15

You are installing a single-pole toggle switch to use as the disconnect for a motor. The information stamped on the switch is "AC only 20 A 120/277 volts." You can use this switch for a 115-volt motor that draws ___ amps at 120 volts.

15.6 amps

In a circuit with 10 ohms resistance and 15 ohms inductive reactance, the impedance is ___ .

18.0277

NFPA 70E was first published by the National Fire Protection Association in ___.

1979

For a 225-amp service where 4/0 AWG service entrance conductors are installed, the smallest main bonding jumper permitted is ___ AWG.

2

Handholes are not required in metal parking lot light poles if the base is hinged and the pole is ___ feet or less in height.

20

When connected to a 120/240-volt, 3Ø piece of equipment a 10 AWG SJO flexible cord can carry ___ amps. The equipment requires a neutral connection and this conductor should be counted as a current-carrying conductor.`

20

At a recreational vehicle park, electrical service feeders shall be calculated on basis of not less than 600 volt-amperes per site when equipped with ___.

20A Supply facilities with only dedicated tent sites.

The largest OCPD that can be installed to protect 4/0 AWG THHN/THWN circuit conductors is rated at ___ amps. The connected load draws 180 amps and will NOT be operated continuously. The OCPD has terminations rated at 75°C.

225

A 4/0 AWG conductor that is connected to a circuit breaker in a 120/208-volt, 3-ph, 4-wire panelboard can carry ___ amps of current inside the panel.

230

In NEC article 500.8, equipment marked for use in a class 1 locations and has a marked temperature classification of T3B is suitable for use in environments with a maximum surface temperature of

329F

A 400-A, 3Ø main lug panel will be fed with one conduit from a 300-Amp, 3-pole breaker in a 120/208-volt, 3-ph, 4-wire panelboard. The feeder will consist of three 350 kcmil conductors (one for AØ, one for BØ, and one for CØ) plus a grounded conductor.Refer to Scenario 205.2. The smallest EGC that can be run is a ___ AWG.

4

The smallest size copper wire permitted to be used as a main bonding jumper in a 200-A main breaker panelboard is ___ AWG. The panel is fed from a transformer with one set of 3/0 AWG wire.

4

What minimum size conductors are required to feed a 16000-watt, 240-volt electric furnace operated at 240 volts? Size the conductors per 424.3(B). The branch-circuit OCPD is a circuit breaker that is rated for 75°C.

4

What minimum size copper THHN/THWN conductors are required to feed a 16-KW, 240-volt electric furnace operated at 240 volts?

4

`A 3Ø piece of equipment has a nameplate rating of 54 amps at 240 volts 3-phase. The equipment needs to be connected with STO flexible cord. The cord will contain 3 circuit conductors + a green insulated conductor. The smallest cord you can use is ___ AWG.

4

If the power factor of a load is 0.73, the phase angle, , is ___ degrees.

43.1

The minimum CALCULATED dimension for "height" shown in Figure 208.54 is ___ inches. All conductors enter the left size of the pull box and exit the bottom.

44

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

OSHA fines can range from $___.

5,000 - 70,000

Of the more than 36,000 inspections OSHA performed in FY2014 (Fiscal Year 2014), more than ___% were performed on construction sites.

50

Within sight is visible and no more than ___ feet from the object.

50

A 60-gallon water heater is to be installed to supply hot water to the restrooms in an office building. The water heater is rated for 8.2 KW at 240 volts 1-phase. The minimum size THHN/THWN copper wire that can be installed between the required disconnect switch and the water heater is ___ AWG.

8

In a hazardous location, class 1 is a location that

A contains flammable gases

Which of the following is required to be on the life safety branch circuit?

Automatic doors

Which of the following is required to be on the life safety branch of a patient care area.

Automatic doors

Permanent magnets are used in the construction of ___ motors.

DC

Which wiring type is not permitted in Class 2, Division 1 locations?

EMT

A door chime is an example of a device

False

All of the states use the federal OSHA program for safety enforcement in their states.

False

The primary purpose of grounding metal equipment enclosures and metal raceways to the grounding electrode system (earth) is to ___.

II. keep all metal parts at the same voltageIII. limit voltage surges

Capacitor banks are rated in ___.

KVAR

Inductance is represented by the letter ___.

L

The NEC® and ___ require that all switchboards, panelboards and industrial motor control panels shall be field marked to warn qualified persons of arc flash hazards.

NFPA70E

An 8.2 kVA load (rated to operate at the applied voltage) is connected to a branch circuit that is fed from a 2-pole 35 A breaker in a 120/240-volt, 3Ø, 4-wire panelboard. Will the breaker trip due to overload?

NO

Does the NEC ® permit a breaker to be mounted in a breaker enclosure such that to turn the breaker "ON" you pull the breaker handle down?

NO

A 1900 (4_square or 4x4 square) box with a cover that is installed above a drywall ceiling is considered

Not accessible

Which of the following is required to be on the critical branch of a patient care area.

Nurse call systems

Vertically-mounted switches shall be ___ when in the up position.

ON

The qualified person must also have knowledge in the selection and proper care and use of ___and other safety equipment and tools.

PPE

Which of the conversion formulas listed below is correct?

RMS = Peak × 0.707

For a service, the grounded conductor must be

able to carry the load, at least as large as required by Table 250.102(C)(1)

PPE is required for head, face, neck, ___, hands, arms, feet and legs.

a. chin b. eyes c. body

A switch is a device with a ___ rating.

a. current b. voltage

Do not use a ladder that is ___.

a. defective b. broken c. set up improperly

Conductors that are enclosed in Schedule 80 PVC ___.

a. are protected from physical damage b. are capable of being removed

At each workplace, employers shall ___ a written hazard communication program.

a. develop b. implement c. maintain

All space in all directions outside of but within 915 mm (3 ft) of open containers, supply containers, spray gun cleaners and solvent distillation units containing flammable liquids are considered to be a ___ location.

a. Class I, Division 1 b. Class II, Division 1 c. Class I, Division II

Examples of raceways would include ___.

a. EMT b. Schedule 40 PVC c. LFMC d. Wiremold® wall mold

shall be guarded to protect employees from falling into or through these openings.

a. Floor openings b. Floor holes c. Wall openings

___ when current flows in a conductor.

a. Heat is generated b. A magnetic field is created

Which of the flexible cords or cables listed below can be used in dry locations?

a. PD b. HSJO c. EV

The service disconnecting means for a 3-phase service is permitted to consist of __

a. not more than 6 separate circuit breaker enclosures, each with a 3-pole breaker b. a fusible switchboard with a maximum of 6 switches c. a main breaker panelboard with eight individual 3-pole circuit breakers

A circuit breaker is an overcurrent protection device that is designed to automatically open the circuit when a(n) ___ condition occurs.

a. overload b. short-circuit c. ground-fault

Any ___, that is/are part of your job duties, must be outlined in an emergency action plan.

a. rescue b. medical duties

Which 2 AWG conductor has a higher resistance?

aluminum

300.6(A) in the NEC refers to ferrous metal equipment. Which of the following metals are considered to be ferrous?

carbon steel

An electric-discharge luminaire utilizes a ___ for the operation of the lamp.

ballast

For temporary installations, the NEC® requires that receptacles be ___.

c. of the grounding type

Buried raceways and cables under Class I locations in bulk storage plants shall be considered to be within a ___ location.

d. Class I, Zone 1

Each circuit, leading to or through motor-fuel-dispensing equipment for remote pumping systems, shall be provided with a disconnecting means that will simultaneously disconnect all conductors of the circuits, including the grounded conductor. ___ are not permitted for such required disconnecting means.

d. Single-pole breakers utilizing handle ties

When a tripped breaker is found, you should ___.

determine the cause of the trip and correct it before resetting the breake

A coil of wire wrapped around an iron core is a(n) ___ when it carries current.

electromagnet

Ground rods made of aluminum RMC ___.

e. shall not be permitted

OSHA provides ___ to small businesses to help them provide a safe environment for their workers.

education

Total opposition to current flow in an AC circuit is referred to as ___.

impedance

In an AC circuit the total opposition to current flow is referred to as ___.

impedance (Z)

correction of power factor is generally required due to the presence of ___.

induction motors

In a purely inductive circuit, current is said to ___ the applied source voltage.

lag

In an inductive circuit, the current ___ the applied voltage.

lags

In a purely capacitive circuit, current is said to ___ the applied source voltage.

lead

Unused openings in panelboards can be closed using

listed fillers

Employees must be informed of any operations in their work area where hazardous chemicals are present, and the ___ and availability of the written Haz Com program, including the required list(s) of hazardous chemicals and MSDS sheets.

location

Apparent power is measured in ___.

volt-amps

Apparent power is measured in ____.

volt-amps

If a circuit is operating at 208 volts (RMS) the peak value of the voltage is ___ volts.

294.2

Any branch circuit conductor located within ___" of a ballast, within a ballast compartment, shall have an insulation rating not lower than 90ºC.

3

OSHA is a federal agency within the United States Department of ___.

Labor

___ shall not support luminaires weighing over 6 lb.

Lampholders

Which of the following is required to have an alternate source of power automatically restored within 10 seconds after the interruption of the normal source in a nursing home?

Lighting in dining halls

A 15-amp, multiwire branch circuit is connected to breakers 1 and 3 in a 120/208-volt, 3Ø, 4-wire panelboard. ___ if the "hots" from breakers 1 & 3 are connected to a 2800-watt load.

The load will operate normally and the breaker will not trip

Refer to Figure 211.6. After removing the receptacle from its package, you are going to check it with an ohmmeter. If the leads of the ohmmeter are placed between Points D and G, the meter should indicate ___ ohms.

00

An AC generator produces ___ cycle(s) per revolution for each pair of poles.

1

Only the AØ tap and feeder conductors are shown connected to the distribution block. BØ and CØ taps are run from the block into each switch and panelboard. Additionally, neutral taps will be run to the panels, and to the switches, where required.What is the smallest metal wireway that can be used for the service "gutter" shown in Figure 208.64? The 3Ø, 4-W feeder consists of eight 600 kcmil conductors. The following taps will be made in the distribution block: Panel LA: four each 3/0 AWG Switch 1: three each 500 kcmil Panel LB: eight each 4/0 AWG Switch 2: four each 1/0 AWG (4 in ea conduit) Switch 3: three each 3/0 AWG Switch 4: four each 2/0 AWG

10 X 10

`Refer to Figure 208.34. The smallest (volume) junction box that can be used in the installation shown below is a___. Conduits #1 and #4 each contain twenty-four 10 AWG wires. Conduits #2 and #5 each contain nine 6 AWG wires. Conduits #3 and #6 each contain sixteen 8 AWG wires. Conduits #7, #10, #9, and #12 each contain twenty-eight 12 AWG wires. Conduits #8 and #11 each contain six 8 AWG wires. All conductors are "wire nutted" inside the box.

10" × 10" × 6" deep

Wiremold ® surface metal raceway is to be installed in a science lab. The raceway is 1 1/ 4" deep and 3 3/ 8" high. There will be 18 circuits installed. Each circuit is protected by a GFCI circuit breaker in the panelboard. 12 AWG THHN/THWN conductors will be installed in the raceway. The ambient temperature around the raceway is 80°F. The ampacity of each circuit conductor is ___ amps.

12

A 19.7 kW boiler (water heater) is operated at its rated voltage when connected to a 2-pole breaker in a 120/240-volt panel. The smallest conductors permitted to feed this equipment are used. The maximum size OCP permitted is ___ Amps.

125

A branch circuit, where 2 AWG conductors are installed, serves a single load that will not operate more than 3 hours. These conductors can be protected by a circuit breaker with a rating no greater than ___ Amps.

125

Control voltage for permanent amusement attractions shall be a maximum of ___ volts, nominal, ac to ground.

150

Inside a 277/480-volt, 3-ph, 4-wire panelboard, a 1/0 conductor that is connected to a circuit breaker can carry ___ amps of current.

150

When connected to a 1Ø piece of equipment that operates at 240 volts, a 12 AWG SJO flexible cord can carry ___ amps.

25

The NEC® states that contact of dissimilar metals be avoided where practicable. The Code reference that specifically permits steel threaded rigid couplings to be used with aluminum rigid metal conduit is ___.

344.14

The smallest circuit breaker that can be installed in a panel is ___ Amp. The circuit supplies power to a 240-volt, single-phase, 6.6 KW, 50-gallon water heater.

35

A location in which ignitable flammable, flammable liquidproduced vapors

Class 1

Plug fuses and fuseholders can be used to protect circuits on ___ systems.

II. 120/240-volt, 1Ø, 3-wireIII. 120/208-volt, 3Ø, 4-wire

Six-foot lighting "tails" made from 3/8-inch FMC are used to connect recessed luminaires ("can lights") above a lay-in grid ceiling. The space between the ceiling and the roof deck is used as an air return for the air-conditioning/heating system. In this plenum ceiling space, is the use of lighting tails made of FMC a violation of the NEC®?

No

An AC circuit that has only resistive loads connected to it will result in current and voltage being in phase with each other.

True

In a recreational vehicle, the gas, water and waste pipes shall be considered grounded if they are bonded to the chassis.

True

Only ungrounded conductors shall be opened by switches.

True

Panelboards and switchboards primarily control light and power circuits.

True

Per the NEC®: Generally, conductors are required to be insulated.

True

An emergency action plan includes ___.

a. escape routes b. procedures for those employees who are to operate any critical equipment c. procedures to account for all employees after an emergency evacuation

As referenced in the NEC® at 300.6(A) and 300.20(B), the Code frequently distinguishes between ferrous and nonferrous metals because ferrous metals

a. have magnetic properties b. are more likely to corrode than nonferrous metals

Employers shall ensure that employees are provided with ___ to the extent necessary to protect them in the event of a spill or leak of a hazardous chemical.

a. training b. information

Mobile home service equipment is permitted to be located ___ the mobile home.

adjacent to

For the purpose of inspection and to determine the safety and health conditions, OSHA has the right to enter workplaces ___.

after first presenting official credentials at an opening conference

Where a conduit emerges from the earth or concrete under a gasoline pump, a seal must be installed ___ after the conduit emerges for the earth or concrete.

as the first fitting

When working near live parts, you must know the ___ related to the work.

dangers

As the distance between two magnetic poles increases, the force of attraction (strength of the magnetic field) ___.

decreases

Where the throw is vertified, double-throw knife switches ___ means shall be provided to hold the blades in the open position when so set.

gravity

The apparent power used by an induction motor circuit is ___ the true power delivered by the motor.

greater than

The ability of an overcurrent device to safely open under fault conditions is referred to as its ___ rating.

interrupting

For the purpose of determining the number of current-carrying conductors in a cable or conduit, the neutral ___ counted when the branch circuit is 120/208-volt, 3Ø, 4-wire connected to a 120/208-volt, 3Ø wye, 4-wire panelboard. Each of the three circuits carries 16 amps and serves resistive (linear) loads.

is not

The "W" suffix (last letter) in any of the "S-type" flexible cords designates that the cable ___.

is suitable for wet locations

A(n) ___ is a complete lighting unit consisting of a light source such as a lamp or lamps, together with the parts designed to position the light source and connect it to the power supply.

luminaire

A PAR lampholder is installed in a 1-gang weatherproof "bell" box. This box is permitted to be supported by RMC and threadless connectors where ___.I. no more than 18" of RMC is stubbed out of the ground and enters the box II. at least two RMCs are stubbed up out of the ground into the bottom of the box

neither I nor II

Capacitors in series add like resistors in ___.

parallel

Inductors in parallel add like resistors in ___.

parallel

Meter leads must have an insulation that is rated for the ___ voltage of a circuit.

peak

Poor power factor could occur as the result of the presence of ___.

refrigeration equipment using induction motors

The plans indicate that you should install a 300-amp branch circuit in Schedule 40 PVC with a 4 AWG equipment grounding conductor. However, you did not have any 4 AWG wire so you pulled in 10 AWG instead. With a load connected, the normal circuit current will be ___ with the 10 AWG EGC (compared to using a 4 AWG EGC).

the same

For temporary installations, Type NM and Type NMC cables shall be permitted to be used in any dwelling, building, or structure, up to a maximum height of ___ feet.

there is no height limitation.

Qualified Persons need ___ and knowledge of equipment and hazards to work safely.

training

How many 20-amp kitchen countertop Receptacle

0

Triplex service-drop conductors of 120/240-volts, 1Ø where passing over a sidewalk must maintain a minimum clearance of ___ feet above final grade.

10

The class and material group classification where combustible metal dusts such as magnesium are present is

Class 2, Group E

A location in which easily ignitable fires are manufactured is a

Class 3, division 1

The NEC permits the attachment cord and plug that is attached to an air compressor to be used as the disconnecting means. How does section 100.22 require that this disconnecting means be identified?

It's purpose is obvious and not required to be marked.

Which of the following conductor installations are in locations that are considered to be wet?

a. Open conductors on insulators between a pole mounted transformer and a building. b. Conductors installed in PVC Schedule 40 conduit underground. c. Conductors installed in surface-mounted conduit inside a car wash. d. Conductors installed in threaded rigid metal conduit in a concrete slab.

Which of the following is a type of circuit condition?

ground fault

A service disconnecting means shall be installed at a(n) ___ location either outside of a building or structure or inside nearest the point of entrance of the service conductors.

readily accessible

When PVC is installed in a concrete slab, this is considered to be a ___ location.

wet

Section __ in the NEC specifies that all 120-volt receptacles in the kitchen of a cafeteria are to be gfci protected

210.8(B)(2)

Feeders for several motors are calculated using the sum of the table flics of all motors plus ____ % of the largest motor

125%

How long does something need to run to be a continuous load

3 hours

A continuous load is any load that expected to operate for

3 hours or more.

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 2, division 1 and 2 locations.

30 V

Which of the following requires that a GFPE device be installed?

480/277-volt, 3Ø, 4-wire switchgear with a 1000-A main breaker

The smallest THHN/THWN copper grounded conductor that can be installed for a service is ___ when the ungrounded conductors are 1/0 THWN/THHN copper.

6

Using the standard calculation, four or more appliance which are fastened-in- place in a one- family dwelling are computed at___ of the total load for all appliances.

75%

Chapter 8 in the nec covers ___ and is independent of the other nec chapters. Provisions in other chapters do not apply unless directly referenced in chapter 8

Communication systems

All 120- volt kitchen receptacles in the kitchen of a school cafeteria are required by the NEC to be GFCI protected

True

When a load is operating, heat is generated in the circuit conductors.

True

Where a service (meter and fused safety switch) is built on a rack that is located 200' from the building it serves, the rack is considered a structure per the NEC®.

True

Copper conductors are installed between a main breaker service panel and a main lug only subpanel. The conductors between the two panels are protected against ___ currents.

a. ground-fault b. overload c. short-circuit

Which of the following affects how much current a wire can carry?

a. insulation type b. conductor material c. conductor size d. surrounding air temperature

When planning a service installation, which of the following should be considered?

all of these

Fuses installed for motor branch circuits generally are of the dual-element time-delay type because these OCPDs can hold ___ current for a short period of time that is long enough to get the motor up to speed.

overload

Two ungrounded branch circuit conductors are installed to serve a load. These are installed in PVC. The 8 AWG copper ungrounded conductors are permitted to be ___.

stranded

The interior of any dip or coating tank of a flammable liquid is considered to be a ___ location.

a Class I, Division 1

For spraying operations conducted within an open-top spray booth, the space ___ vertically above the booth and within ___ of other booth openings shall be considered a Class I, Division 2 location.

. 915 mm (3 ft) 915 mm (3 ft)

A 4" square box (1900) with a 2-gang plaster ring contains:(one) 12/2 with ground AC cable (BX) with exterior connector (contains hot & neutral + isolated grounding conductor)(one) 14/2 MC cable ( contains a ground) with exterior connector (contains hot & neutral)(one) 14/2 MC cable ( contains a ground) with exterior connector (contains sw. leg & neutral)(one) toggle switch (connected to the 14/2)(one) isolated ground receptacle (connected to the 12/2 BX and its isolated ground)The plaster ring has 4.3 cu. in. stamped into the metal. The smallest "1900" box you can use and not violate the NEC® is one that is ___ inches deep.

1 1/2

A recessed incandescent luminaire is to be installed in a ceiling grid system. The shortest 14 AWG "fixture whip" permitted, between a 4-square 20-amp branch circuit box and the wiring compartment of the luminaire, is ___. Note that the 14 AWG wires are smaller than the 20-amp circuit breaker can protect and are therefore "tap conductors" by definition.

1.5 feet

The ampacity of each conductor of a 16/3 AWG multiconductor Type SPT-2 flexible cord, used to supply utilization equipment which is fastened-in-place, is ___ amps. See NEC® T. 400.4 for available sizes and which conductors are current carrying.

13

In a mobile home, nonmetallic cable located ___ inches or less above the floor, if exposed, shall be protected from physical damage by covering boards, guard strips, or raceways.

15

Per section 110.26(A)(1) in the NEC, where the wall opposite a panel board is a metal door condition ___ applies to the clearance requirements

2

Each conduit, connected to the switch box shown above in Figure 208.32, will contain one "hot," one neutral, and one EGC. A duplex receptacle will be installed in the box. The shallowest box permitted for this installation is ___" deep. All conductors are 14 AWG THHN/THWN.

2 3/4

A 4-gang box and a partition are shown above in Figure 210.4. The box will contain 4 devices in Positions 1 through 4 ( left to right). A three-way switch is in Position 1 on the far left. This switch controls 120-volt recessed lighting and is fed from Circuit LA-1. Adjacent to (next to) this switch, a receptacle will be installed in Position 2 and is fed from Circuit LA-3. Panel LA is a 120/208-volt, 3Ø, 4-wire panel. In Position 3 will be a single-pole switch fed from Circuit HA-14. Position 4 will contain a four-way switch that is connected to Circuit HA-13. Panel HA is a 277/480-volt, 3Ø, 4-wire panelboard. The NEC ® requires partitions between Positions

2 and 3

The largest 3-pole circuit breaker that can be used to protect a 10 AWG copper Type SJTO flexible cord is ___ A.

25

The impedance of a series circuit is ___ ohms. The circuit has a resistance of 25 ohms, an inductive reactance of 14 ohms and a capacitive reactance of 10 ohms.

25.3

MC cable is used to connect a 2 x 4 lay-in fluorescent luminaire to a "home run" box as shown above in Figure 208.2. The length of the cable between the box and the luminaire is 26 feet. Where supports #1 & #2 are as far from the connectors as permitted ___ additional supports are required between #1 and #2.

3

Where installed in a 3-pole, 600-volt fused safety switch, the minimum number of fuses required to protect a 277/480-volt, 3-ph, 4-wire branch circuit is ___.

3

You are going to pull in five dedicated (individual) branch circuits into one metal conduit. Each circuit supplies power to a 120-volt load. The ungrounded conductors will be connected to breakers 2, 4, 6, 8, & 10 in a 120/240-volt, 1Ø, 3-wire panelboard. Per the NEC ®, the fewest number of neutral conductors you can install for the branch circuits is ___.

3

A switch box will contain the following:(one) isolated ground receptacle(two) 12/2 with ground AC cables (BX) with exterior connectorsThe shallowest switch box you can use for this installation is 3" x 2" x ___".

3 1/2

An 8" x 8" x 5' gutter is shown in Figure 208.63. The maximum number of 4/0 AWG THWN/THHN conductors that can be installed in the gutter is ___.

39

Schedule 40 PVC is to be installed in a straight run between two junction boxes on the back exterior wall of a strip shopping center. The summertime temperature is 100°F and the wintertime temperature is -5°F. An expansion fitting would be required in this 80' run of PVC because it would expand ___ inches between winter and summer.

4.26

The maximum length of a flexible cord used to connect data-processing equipment to a branch circuit outlet box is ___.

4.5 meters

A ceiling-mounted luminaire that weighs 5 pounds is permitted to be mounted to and supported by a ___.

4/0 box

A branch circuit serving a load is protected with 40-A fuses in a 60-A safety switch. This branch circuit has a rating of ___ amps.

40

Since OSHA's inception, the rate of occupational injury and illnesses has been reduced by over ___ percent.

40

A 3-gang masonry box is shown in Figure 107.458. It will have several PVC conduits connected to it. An equipment grounding conductor will be pulled into each PVC. The box will contain three 4-way switches. Twelve "travelers" are pulled into the box along with two other circuit conductors. All conductors are 12 AWG copper THHN/THWN. The box must have a minimum volume of ___ in3.

47.25

A 120/240v 1-phase 3-wire service panel is fed with three 1 AWG copper conductors. The minimum size grounding electrode conductors connected to building steel is ______________ AWG.

6

A 3/ 4-inch PVC conduit is to be run underground below an area adjacent to a house where a 6" thick driveway will be poured on top of the dirt surface after the trench is backfilled. The conduit will contain GFCI protected 15-Amp circuit conductors feeding a post luminaire in the front yard. The minimum depth the conduit must be below the present dirt surface level (future driveway) is ___ inches.

6

What is the minimum size THHN/THWN wire permitted to serve a load that will draw 47 amps? The load will operate for about 5 hours at a time. The branch-circuit OCPD is a circuit breaker that is rated for 75°C.

6 AWG

Where 6 AWG/7-conductor Type G flexible cable is used to supply fastened-in-place utilization equipment, it has an ampacity of ___ amps. See NEC® T. 400.4 for available sizes. This equipment has a metal enclosure and the connection terminals have 75ºC ratings.

62

The smallest THHN/THWN copper circuit conductors that can be used for a 240-volt, single-phase, 8.5 KW, 50-gallon water heater where connected to a circuit breaker is ___ AWG.

8

The smallest copper overhead service conductors that can be installed for a service are ___.

8

The total current in a series circuit is ___ Amps. The circuit is supplied from a 2-pole breaker in a 120/208-V 3-ph panel. The circuit has a resistance of 25 ohms, an inductive reactance of 14 ohms and a capacitive reactance of 10 ohms.

8.2

If a circuit breaker protecting a 60 Hz circuit can operate on a short circuit in one-half of an electrical cycle, this is ___ mS.

8.33

A section of 4" x 4" wireway is shown in Figure 208.61. The maximum number of 8 AWG THHN/THWN conductors that can be installed in the wireway is ___.

87

Refer to Figure 208.12, shown above. You will need at least ___ straps to support the conduit between enclosures A & B. Trade size 2 IMC with threaded couplings and connectors is used. You will cut and thread the conduit as required. The distance from enclosure A to B is 123 feet.

9

In a 100 Hz circuit, containing a 15 mh inductor, the inductive reactance is ___ ohms. (Remember to change millihenrys to henrys.)

9.42477

What is the maximum size branch-circuit OCPD permitted to serve a single load that is connected with 4 AWG THHN/THWN wire? The branch-circuit OCPD is a circuit breaker that is rated for 75°C. The connected load is NOT continuous and will draw 83 amps.

90

Per 220.43(B) in the NEC ®, ___ VA must be allocated for the lighting track when determining the calculated load on the service where a 12' length of lighting track is installed in the conference room in an office building.

900

In either a purely inductive or purely capacitive circuit, the most the phase angle between the current and the voltage can be out of phase with each other is ___.

90°

To assist in the proper application of the NEC a term that appears in more than one article is defined in

Article 100

For application of Article 516, the interior of any open or closed container of a flammable liquid is considered to be a ___ location.

Class I, Zone 0

The NEC® prohibits mounting luminaires directly to a tree.

False

Three 1-pole breakers in a panel are handle tied, as required by the NEC®, and feed a 3Ø load. All three breakers will trip when a ground fault occurs between the load and the breaker.

False

When a 1900 (4" square) box does not contain devices it is permitted to be supported by EMT if all three of the following conditions are met:1) the EMT is stubbed out of a block wall,2) the box is within 3 feet of the wall, and3) at least two other EMTs enter the box to provide additional support.

False

Refer to Figure 211.10. You are to connect the dishwasher. A dedicated circuit has been run to a receptacle that is located under the sink. The 2-pole, 3-wire receptacle is flush-mounted in the sheetrock wall under the sink. Your two installation options are:

I. Install a flexible cord with a grounding-type attachment plug. There will be 33 inches of cord between the back of the dishwasher and the receptacle.

Grounding electrodes made of galvanized RMC (Rigid Metal Conduit) shall ___.

I. be at least 3/ 4 inch in diameter

Where a 120/240-volt, 1Ø, 3-wire multiwire branch circuit is connected to a "split-wired" duplex receptacle in a bakery, the branch-circuit OCPD/disconnect is permitted to be ___. I. two single-pole circuit breakers without handle ties II. a 2-pole fused safety switch III. a 2-pole circuit breaker

II or III only

Which of the following is an example of a raceway?

II. LFMC III. RMC

If THREE, individual, single-pole breakers are handle tied and used for a 3Ø circuit, ___.

II. all 3 "hots" can be manually opened

A section of 3/4-inch flex is used to feed power into the 1900 box and will be connected to one of the connectors shown below. The box will be mounted behind a drywall wall with a 2-gang plaster ring. Two duplex receptacles will be mounted on the box assembly. The NEC® permits ___ to be used.

II. the straight flex connector

If branch circuits from a 120/240 volt 1Ø, 3-wire panelboard are run in the same conduit as circuits from a 277/480 volt 3Ø, 4-wire panel, is this a Code violation?

NO

You need to get power to a 208-volt load. Your available power is from a 120/240-volt, 3Ø, 4-wire panelboard. Is it permitted for you to run a branch circuit from the neutral bar and a 1-pole circuit breaker installed in breaker space #4? The CB has a 120-volt rating.

NO

Luminaires are installed outdoors under an open porch of a one-family dwelling. The luminaires are marked "Suitable for Wet Locations." Does this violate the provisions of Article 410 of the NEC ®?

No

___ persons shall be used to perform any work on live or energized equipment.

Qualified

Generally, flexible cords and cables shall be installed in continuous lengths without splices or taps.

True

Where flexible cord is used to connect a kitchen food waste disposer to the branch circuit the cord can be connected by which of the following methods?

Using a listed 2-P, 3-wire cord cap inserted into a receptacle that is connected to the branch circuit.

The presence of capacitive reactance in a circuit affects current flow. What is the designated symbol for capacitive reactance?

X C

The presence of inductive reactance in a circuit affects current flow. What is the designated symbol for inductive reactance?

X L

For an AC circuit, current and voltage are in phase with each other when ___.

X L + X C = 0

You are to connect a 3-phase air handler unit (AHU). You decide to use 3 feet of ? inch FMC (Flexible Metal Conduit or flex) since you realize that it has a motor and as such will tend to vibrate. Per the NEC ®, do you need to install an EGC (Equipment Grounding Conductor) with the FMC between the disconnect switch and the AHU? The disconnect has a 30-amp rating but is fused at 20 amps.

Yes

A 120/240-volt, 1Ø, 3-wire multiwire branch circuit is connected to a "split-wired" double single-pole switch as shown here. These are sometimes called dougle or stack switches. Each of the two switches (mounted on the same yoke) will serve a separate 120-volt lighting load. The branch-circuit OCPD/disconnect for these circuits is permitted to be ___.

a. a 2-pole circuit breaker b. two single-pole circuit breakers with identified handle ties c. a 2-pole fused safety switch

OSHA provides ___ in the field of occupational safety and health and for other purposes.

a. education b. research c. information d. training

A comprehensive Haz Com program includes ___.

a. employee training b. other forms of warning c. SDS training

Many ___ are the result of poor housekeeping practices.

a. falls b. trips c. slips

A qualified person is one who has ___ of the hazards involved and what precautions must be taken to prevent any personal harm or equipment damage.

a. knowledge b. understanding c. training

The chemical distributor, manufacturer, or importer shall ensure that each container of hazardous chemical leaving the workplace has the identity of the hazardous chemical.

a. labeled b. tagged c. marked

A metal enclosure surrounding electrically operated equipment ___.

a. provides protection for people against accidental contact with live parts b. protects the equipment from physical damage c. is required to be grounded

Materials or trash left carelessly on the floor or stairs can cause ___.

a. slips b. trips c. falls

A 4-gang box and a partition are shown above in Figure 210.4. The box will contain switches A, B, C, and D ( left to right) that are fed from Circuits 1, 3, 5, and 7 (left to right) from a 277/480-volt, 3Ø, 4-wire panelboard. The NEC ® requires partitions between switches

all of these

Where a branch circuit is protected with a fused safety switch, the ___ determines the rating of the branch circuit.

ampere rating of the fuses

Low-voltage equipment and instruments shall have ___.

attachment plugs that do not allow interchangeability with higher voltage circuits

In a 3Ø panelboard that has vertical busbars, the BØ feeder conductor is connected to the ___ busbar.

center

When temporary installations operate at over 600 volts, access shall be limited to ___.

d. authorized and qualified personnel

Employers shall provide employees with ___ information and training on hazardous chemicals in the work area at the time of their initial assignment.

effective

In general care areas, each patient bed location shall be provided with a minimum of ___ receptacles.

eight

Your only available grounding electrode is the metal underground water pipe from the water utility. You are required by the NEC® to have one other grounding electrode for your service. You could use which of the following driven electrodes?

either I. 8 ft of trade size 3/4 rigid metal conduit II. 10' by 5/8 inch copper-clad ground rod

Every person working on any ___ system needs to be familiar with the NFPA 70E.

electrical

For the purpose of determining the number of current-carrying conductors in a cable or conduit, the neutral ___ counted when the branch circuit is 277/480-volt, 3Ø wye, 4-wire. Each of the three circuits carries 11 amps and the loads are metal halide luminaires (HID lighting).

is

The strength of the magnetic field around a coil (or winding) ___ when DC voltage is applied.

is constant

In a series circuit where inductive reactance is less than capacitive reactance, resulting in a negative phase angle, current will ___ voltage.

lead

A ___ is a device that attracts iron and steel because of the molecular alignment of its material.

magnet

A coil of wire, when carrying current, acts like a ___.

magnet

Magnetic flux comprises the invisible lines of force that make up the ___.

magnetic field

The two axes of alternating voltage or current on a sine wave are a graphic representation of ___.

magnitude and time

26 feet of Type AC cable is used to connect a 2 x 4 lay-in fluorescent luminaire to a "home run" box as shown above in Figure 208.2. Supports #1 & #2 are as far from the connectors as the NEC ® permits. You will have to install ___ additional supports between #1 and #2.

more than 3

Emergency action plans ___ and shall cover the designated actions employers and employees must take to ensure employee safety from fire and other emergencies.

must be in writing

Does the NEC ® permit the installation shown above at X in Figure 208.1? The box is supported only by the conduits. The distance from the top of the head track to the bottom of the 4-SQ box is 2 inches. Both conduits are EMT and are attached to the box with steel compression connectors (not visible in drawing).

no

The deep masonry box, shown above in Figure 208.39, will contain three 4-way switches, one single-pole switch, and one three-way switch. Conduits #1 and #4 each contain four 10 AWG wires that are spliced in the box. Conduit #2 contains twelve wires and conduit #3 contains five wires. Additionally, each conduit contains a ground that equals the size of the circuit conductors in that conduit. The conductors in conduits #2 and #3 are 12 AWG and are terminated on the switches. Will this installation violate the Code?

no

For the pull box shown in Figure 208.52, the minimum calculated height is ___ inches. All conductors enter the bottom and exit the right side of the box.

none of thes

As shown in Figure 208.41, you will make 22.5° offsets to get from each box to the wall surface where you will surface mount EMT. To avoid violating the NEC ® you can make a ___ º saddle. I. 30 II. 45 III. 60

none of thesE

Where stage smoke ventilators are released by an electrical device, the circuit operating the device shall be ___ and shall be controlled by at least two externally operable switches.

normally closed

When couplings and connectors are properly tightened in a run of conduit, this will ___ the amount of time required for a circuit breaker to open when a short-circuit occurs.

not affect

X-Ray equipment shall have a disconnect that is ___.

operable from a readily accessible location.

Providing a low impedance ground return path ___ when a ground-fault occurs.

permits a high current to flow

As a safety consideration, when power is ___ a solenoid valve controlling the flow of natural gas to the gas-fired cooking appliances in a restaurant, the valve closes and stops the gas flow to the appliances.

removed from

Where non-metallic sheathed cable is used for underground wiring in a bulk storage plant, an equipment grounding conductor ___ electrical continuity of the raceway system and the grounding of all non-current-carrying metal parts.

shall be included to provide

The graphic representation of AC voltage or current values over a period of time is a ___.

sine wave

In a panelboard, 3/0 AWG feeder conductors are connected to a 2-pole, 200-amp circuit breaker. The feeder conductors enter a pull box where several other conductors are connected to them. If 2 AWG conductors are connected to the feeder, the 2 AWG conductors are ___.

taps

In major repair garages, where vehicles ___ are repaired or stored, the area within 450 mm (18 in.) of the ceiling shall be considered unclassified where ventilation of at least 1 cfm/sq ft of ceiling area taken from a point within 450 mm (18 in.) of the highest point in the ceiling is provided.

that are fueled with lighter-than-air fuels

Per the NEC ® which of the following bends are permitted in a conduit run between two junction boxes?

two 90s plus one-45° three-point saddle plus one-12° offset

In a minor repair commercial garage, if there is mechanical ventilation providing a minimum of four air changes per hour, the entire floor area shall be:

unclassified

A panelboard that is marked "suitable only for use as service equipment" ___.

usually has the neutral bar factory bonded to the enclosure

Two parallel sets of conductors are to be connected to lugs in a transformer and to lugs in a fused safety switch. Does the NEC® permit the conductors in the transformer to be connected with single lugs and the conductors in the safety switch to be connected with double lugs

yes

When making up the branch circuit wires to the breakers in a newly installed panelboard, you found that some of the wires were cut too short. Does the NEC ® permit any of these to be spliced with wire nuts so that another piece of wire can be added to be able to reach the breaker or the neutral bar?

yes

When special permission is granted by the AHJ, this is in the form of

a written document

The smallest main breaker that can be installed in a 24-circuit service panel on a single-family dwelling is ___ amps.

100

The exact code reference that requires electrical equipment to be securely fastened to the surface on which it is mounted is

110.13(A)

Which of these wiring methods is NOT permitted to be used for service-entrance conductors?

AC cable

The NEC permits the insulation for an ungrounded conductor to be ___in color.

Anything that isn't green white or gray

If a motor and the disconnecting means ( safety switch) are located in the same room and 60 feet apart, these___ considered to be within sight (of each other) per the NEC

Are not

Improper electrical terminations lead to increased

Circuit resistance, also voltage dropped across the terminations

A fluorescent luminaire is an example of a device

False

B-phase on a 120/240 volt 3-ph, 4-wire system is called the ___ leg.

High stinger wild.

Which of the following statements is true for an individual branch circuit that is run in a conduit with other circuits?

It can charge a neutral with another circuit

Is the conduit between the lighting peoples covered by the NEC? The street lightning and conduit were installed in the utility easement as shown in the drawing a the right and is under the control of CenterPoint energy.(utility company)

No.

The purpose of the NEC is the practical safeguarding of __ from hazards arising from the use of electricity.

Peoples and buildings

___ equipment is constructed so that water will not enter it.

Watertight

A service (meter and fused safety switch) is built on a wooden pole that is located 200' from the building it serves. Does the NEC® consider the pole to be a structure?

Yes

A 15-amp, multiwire branch circuit is connected to breakers 1 and 3 in a 120/208-volt, 3Ø, 4-wire panelboard. If somewhere in the circuit the "hot" from breaker 3 and the metal conduit touch together,___.

a ground fault will occur and the breaker will trip

A bare copper conductor can be used for ___ when it is installed in EMT as part of a branch circuit.

a grounding conductor

A building or structure can have a service separate from the main service where it supplies

a standby system, fire pump

Which of the following are characteristics of THHN/THWN insulation?

a. It is heat-resistant. b. It can be installed in wet, damp, or dry locations. c. It is flame-retardant. d. It is moisture-resistant.

Service equipment shall have an ampere interrupting rating (AIR) ___ the fault current available at the service location.

greater than or equal to

Which of the following is a type of circuit condition?

overload

The service point is located at the ___. The Power Company owns the pole-mounted transformer and has provided power to a customer-owned pad-mounted transformer. From this transformer, a service lateral was installed to the meter socket on the customer's building.

pole-mounted transformer