NEC Exam
Conductors are for non-power limited (NPLFA) fire protected signaling systems: - Shall be solid only - Shall be stranded only - Are permitted to be aluminum - Are permitted to be solid or stranded
- Are permitted to be solid or stranded
What is the connecting of metallic parts to form an electrically conductive path that ensures connectivity? - Welding - Soldering - Bonding - Grounding
- Bonding
For the connection of equipment, the code definition of receptacle is a device designed to: - Transform voltage - Support the equipment - Connect to the equipment - Mate with the corresponding device
- Mate with the corresponding device
Outside of parental care vicinity, the equipment grounding conductor connected to the grounding terminals of isolated ground receptacles shall be clearly identified along the equipment grounding conductors entire length by: - Solid green insulation - Solid green insulation with one black stripe - Solid green insulation with white stripes - Solid green insulation with one or more yellow stripes
- Solid green insulation
Equipment for emergency sources of power shall be located in spaces protected by a: - Sprinkler system or in spaces with at least a 2 hour fire rating - Fire protected system or in spaces with at least 1 hour fire rating where located within an assembly occupancy for more than 1000 people - Fire protection system, or in spaces with at least 1-hour fire rating where located within a business occupancy for a building that is 801 inches in height - Sprinkler system, or in spaces with at least 2-hour fire rating where located within a health care occupancy where persons are not capable of self-preservation
- Sprinkler system, or in spaces with at least 2-hour fire rating where located within a health care occupancy where persons are not capable of self-preservation
Where electrical equipment operating under 1000 volts is installed outdoors, which of the following is a current code provision? - Illumination shall be provided for the space - The equipment shall be protected from accidental contact by vehicles and traffic - The space from the grade to height of 6.5 feet shall be dedicated to the electrical installation - The width, depth, and height of the dedicated equipment space are found in table 110.25 (A)(1)
- The width, depth, and height of the dedicated equipment space are found in table 110.25 (A)(1)
All of the following wire methods are allowed for underground wiring to pool equipment except: - Type UF Cable - Rigid metal conduit - Reinforced thermosetting resin conduit - MC cable listed and marked for direct burial
- Type UF Cable
Crane-hoist functions shall be considered to be protected from motor and branch circuit overload if the sensing device limits the hoist to _______ during an overload condition. a. Lifting b. Towering c. Rotation d. Intermittent operation
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How many 350-kcmil conductors are indicated by the riser diagram to serve the main disconnect switch? -2 -4 -8 -12
?
The approximate full load ampere rating for a 208/120 volt 3-phase, 100-KVA transformer is _________ amperes? a. 240 b. 278 c.48 d. 833
d. 833
All of the following are code violations except: -There is no outdoor receptacle outlet shown at the front of the house. -The bathroom at the center of the house does not show GFCI protection. -Exterior lighting is not shown in front of the garage as code requires at least one wall switch-controlled lighting outlet at all exterior entrances. -In the master bathroom, the receptacles shows no GFCI protection and cannot be GFCI protected as far from the garage GFCI receptacle since the bathroom receptacle must be AFCI protected.
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Given: A 480 volt, 3-phase branch circuit serves a motor that has a 5-HP rating, and all terminal connections are rated for 75 degree Celsius. The conductors for this branch circuit must be at least ______ AWG. a. 14 b. 12 c. 10 d. 8
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Given: An office building has a 3-phase service. A 208Y/120 voltage subpanel in the building serves 175 general-use receptacles and a 24,000 VA (1120 volt) lighting rod. The lighting rod is continuous and the receptacle demand load is non-continuous. Using only the loads, what is the minimum size THWN copper fender conductors permitted to serve the subpanel? a. 1 AWG b. 1/0 AWG c. 30/AWG d. 250 KCMIC
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Is the branch circuit voltage for the air conditioner circuit shown in the plan? -No -Yes, it is 110 Volts -Yes, it is 208 Volts -Yes, it is 240 Volts
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Single motor tap conductors from the part of the tap from the branch circuit to a listed manual motor controller, additionally marked "suitable tap conductor protection in group install locations", or to a branch-circuit protection device, shall be permitted to have an ampacity not less than _________ of the branch circuit conductors. - 1/3 - 1/2 - 1000% - 125%
- 1/3
A sign with a calculated load of 3,000 VA that is to operate for 11 hours shall have an additional demand of _______% added to it when sizing the feeder: - 110 - 115 - 125 - 175
- 125
What is the minimum number of 20-amp branch circuits for the general lighting load in a 2,500 sq. ft. house with 120-volt circuit? - 2 - 3 - 4 - 5
- 4
What is the rating of the breaker to serve the AC? -15 -20 -30 -40
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A grounding electrode conductor or bonding jumped that is the sole connection to two or more plate electrodes shall not be required to be larger than the ________ AWG copper. a. 4 b. 6 c. 8 d. 3/0
b. 6
A circuit supplying a resistive load has a total current reading of 27 amperes. The resistance of a faulty connection is .21 ohms. The power consumed by the faulty connection is _________ watts? -.2 -5.7 -54 -153
153
The NEC covers the installation and removal of the conductors, equipment and raceways for all of the following except: - Mobil Homes -Floating Buildings -Electrical Substations -Electricity Garages
Electrical Substations
Under normal operating conditions, In a branch circuit protected with a 15-amp breaker and serving a 5-amp load, the current flow in the equipment grounding conductor would be how many amps? a. 0 b. 2.3 c. 5 d. 55
a. 0
Energized equipment operating at 120 volts nominal voltage to ground, with exposed live parts on one side and a tile wall on the other side of the working space, is condition _________. a. 1 b. 2 c. 3 d. 4
a. 1
Energy storage battery systems for dwelling units solar photovoltaic systems shall operate at a maximum nominal voltage of ________ volts. a. 100 b. 250 c. 600 d. 1,000
a. 100
The minimum earth cover required for a VF cable carrying 30 volts used in circuits for control irrigation and for landscape lighting is _______ inches. a. 6 b. 12 c. 18 d.24
a. 6
Each vented cell of a stationary storage battery shall be equipped with _______ that is designed to prevent destruction at the cell due to ignition of gases within the cell by an external spark or flame under normal operating conditions. a. Flame arrestor b. Electrolyte thermometer c. Pressure release jar d. Heat resistance insulating support
a. Flame arrestor
A 125-volt, twist lock receptacle installed on a temporary power system of a construction site would require: a. GFCI protection b. No protection or testing c. AFCI d. LCDI
a. GFCI protection
Terminals that are used for electrical connection of more than 1 conductor are: a. Required to be identified b. Prohibited c. Required to have all the conductors sized 12 AWG or smaller d. Required to have all the conductors under the terminal be the same size
a. Required to be identified
All of the following wiring methods are allowed for underground wiring to pool equipment except a. Type of cable b. Rigid metal conduit c. Reinforced thermosetting resin conduit d. MC cable listed and marked for direct burial
a. Type of cable
The grounded circuit conductor for a controlled lighting circuit shall be installed at the location where switched control lighting loads that are supplied by a grounded general purpose branch circuit serving any of the following except: a. attics b. Hallways c. Stairways d. Bathrooms
a. attics
Cable ties, when used for securing LFNC, shall be: a. listed b. identified as suitable c. Of the heavy duty type d. At least 6"
a. listed
For a new installation, the frame of an electric clothes dryer is permitted to be grounded by: a: Connecting the frame to an equipment grounding connector b. Connecting the frame to a separate electrode c. A 12 AWG bare connector run to the nearest water pipe d. Using bonding connector to connect the grounded connector to the frame
a: Connecting the frame to an equipment grounding connector
Field-wired conductors between a heater and the supplementary overcurrent device shall be not less than ________ % of the load served. a. 80 b. 100 c, 125 d. 200
b. 100
Given: a 15 amp AL general use snap switch serves as the controller for a motor. What is the maximum motor full-load current in amps permitted to allow the use of the switch? a.10 b. 12 c. 15 d. depends on whether the bas is continuous or non-continuous.
b. 12
Given: For stationary motor of under 2 HP, a 15 amp rated AC general-use Snap switch serves as the motor controller. To allow the use of 15 amp switch as the controller, what is the max motor fill current permitted? a. 10 amps b. 12 amps c. 15 amps d. Depends on whether the load is continuous or non-continuous.
b. 12 amps
Nameplates for stationary and portable generators rated more than _______ KW shall give the sub transient and transient impendences of the generator. a. 10 b. 15 c. 25 d. 50
b. 15
Given: A non-time delay fuse is used as the overcurrent-protection device for a 3 phase, squirrel cage, resisted starting design B motor. The motor full load amp rating is 60 amperes. Where starting current is sufficient, the maximum standard non-time delay fuse permitted for the motor is _______ amps. a. 110 b. 175 c. 200 d. 225
b. 175
For a design B polyphase AC motor, the setting with an inverse time breaker can be what max % of fill-load current or motor? (assume none of the exceptions are applicable) a. 175 b. 250 c. 300 d. 1100
b. 250
The minimum width of clear working space required for a 24" wide electrical panel supplied by a 240/120 volt supply is _______ inches? a. 24 b. 30 c. 36 d. 42
b. 30
For a typical case circuit breaker protecting 20 amp circuits. it's interrupting rating shall be shown on the circuit breaker if it is other than how many amps? a. 1000 b. 5000 c. 10,000 d. 15,000
b. 5000
What change in length, due to expansion, is 200 ft of rigid nonmetallic conduit indicated by code to have when conduit is installed outside and exposed to 90 degrees Fahrenheit of temp change from the coldest day to hottest day? a. 3.6" b. 7.3" c.10.8" d. Depends on conduits diameter
b. 7.3"
Where a solid copper conductor is used for the common equipotential bonding grid for a swimming pool, it shall be a minimum of ________ AWG. a. 10 b. 8 c. 6 d. 4
b. 8
The service conductors supplying a single-phase one family dwelling shall be permitted to have an ampacity of not less than _________ percent of the service rating? a. 80 b. 83 c. 100 d.125
b. 83
For a central vacuum outlet assembly, the required ampacity of the connecting conductors shall be at least ________% of the ampacity of the branch conductors? a. 75 b. 85 c. 100 d. 125
c. 100
For other than one and two family dwellings, at least one 125 volts single phase 15 or 20 amp rated receptacle outlets shall be installed within_______ feet of indoor electrical service main equipment. a.6 b. 12 c. 25 d. 50
c. 25
For a service consisting of a set of 2 paralleled 350-kcmil copper service-entrance conductors, the minimum size aluminum grounding electrode conductor permitted from the metallic water service to the service is _______ AWG. a. 1/0 b. 2/0 c. 3/0 d. 4/0
c. 3/0
An assembly containing one male plug and 2 female cord connectors, used to connect two loads to one branch circuit is a: a. splitter b. Three-way c. Two-fer d. Wye connector
c. Two-fer
Are flexible power supply cords permitted to supply freestanding type office furnishings? a. No b. Yes, if conductors are at least 14 AWG c. Yes, if conductors are are at least 12 AWG d. Yes, if conductors are at least 10 AWG
c. Yes, if conductors are are at least 12 AWG
Are flexible power supply cords permitted to supply freestanding type office furnishings: A No b. Yes, if conductors are at least 14 AWG c. Yes, if conductors are at least 12 AWG d. Yes, if conductors are at least 10 AWG
c. Yes, if conductors are at least 12 AWG
What minimum size service-entrance THWN copper conductor in AWG, is required for a single-family dwelling service, given the main breaker is 200 amperes but the computed load is only 100 amps? a.4 b.1/0 c.2/0 d.4/0
c.2/0
Overcurrent devices on solidly grounded wye services that are more than 150 volts to ground but less than 1,000 volts phase to phase shall be ground-fault protected when the service is rated: a. any like b. 600 amps c. 800 amps d. 1000 amps
d. 1000 amps
The code states that listed ground fault circuit protection for a personnel integral to the generator is required for receptacle outlets that are part of a _____ KW generator or smaller. a. 5 b. 8 c. 10 d. 15
d. 15
Given: A junction box has live 8 AWG underground conductors, three 8 AWG equipment conductors and two clamps inside the box. What is the minimum size device box in cubic inches the NEC allows? a. 12 b. 15 c. 18 d. 21
d. 21
Given: Low voltage lighting systems shall consist of an isolating power supply, low voltage luminaries, and associated equipment that are identified for the use. The output circuits of the power supply shall be rated for ________ amps maximum under all load conditions. a. 4 b. 12 c. 18 d. 25
d. 25
On a heat pump or A/C unit, duct heaters shall be located at least how many feet from the unit unless identified and marked as suitable for a closer installation? a. 1 b. 2 c. 3 d. 4
d. 4
Wha is the maximum number of disconnects permitted for the service of a dwelling? a. 1 b. 2 c. 4 d. 6
d. 6
Where the building service department is installed inside the building, it is required to be located: a. Within 3 feet of a grade-floor window b. Within 5 feet of the point of entrance of their service conductors c. Within 15 feet of the point of entrance of the service conductors d. In a readily accessible location nearest the port of entrance of their service conductors
d. In a readily accessible location nearest the port of entrance of their service conductors
A furnace with a 1 HP motor, protected with a circuit breaker accessible to the user, does not require a disconnect if: a. Provided with a unit switch b. The unit is protected with a GFCI c. The circuit breaker is 20 AMPS or less d. Located on the same floor with the circuit breaker
d. Located on the same floor with the circuit breaker
The size of an equipment grounding conductor is most dependent on the: a. Line voltage b. Line resistance c. Line inductance d. Overcurrent device
d. Overcurrent device
Given: A raceway contains 1/0 AWG THHN copper conductors. The ambient temperature is 100 F. The conductors connect to terminals rated for 75 C. There are only 3 conductors in the raceway. The minimum allowable current for each conductor is __________ amps. - 125 - 150 - 155 - 170
- 150
A 25 unit mobile home park has a single-phase 120/240 volt service. The calculated load for each mobile home is 15,000 VA. This mobile home must have a service of at least _________ amps. - 375 - 400 - 1600 - 1700
- 1600
Is an electrical penetration into a designed information technology room required to be rated? - No - Yes, it shall have airtight rating - Yes, it shall have watertight rating - Yes, it shall have fire-resistant rating
- Yes, it shall have fire-resistant rating
A 3-phase, 480 volt delta system is balanced with a 30 KWA load per phase. The actual total load is 90,000 VA. What is the line current amperes? -625 -96.22 -108.25 -166.06
625
When installing parallel conductors, is installed in a metal wireway, the parallel sets must: a. Be secured with cable ties to the wireway b. Have all phase conductors grouped together c. Be in groups of not more than one conductor per phase d. Have underground conductors separated from grounding conductors
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Which of the following is correct for type AL cable? a. shall be listed b. Permitted in damp locations c. Shall not be concealed in walls d. Shall not be installed in cable trays
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Given: The duty-cycle service of a motor is short-time duty, is 15 minute rated, and has a nameplate current rating of 25 amps. All terminal connections are rated for 75 degree Celcius. What is the minimum size THWN copper conductors permitted for the branch circuit serving the motor? a. 12 AWG b. 10 AWG c. 8 AWG d. 6 AWG
a. 12 AWG
Given: A 208 Y/120, 3 phase transformer is rated at 150 KVA. The existing load served by the transformer is 220 amps per phase. The approximate additional single-phase load per phase that may be added to the transformer is ________ amps. a. 180 b. 196 c.416 d.501
a. 180
In a detached garage at a dwelling unit, receptacles shall be installed: a. In weather proof boxes b. At least 18" off floor c. 55 feet or more off of floor d. On at least a 20 amp circuit
b. At least 18" off floor
Where disconnecting means for a fluorescent luminaire is external to and not attached to the luminaire, which of the following provisions apply: a. Disconnect shall be a readily accessible location nearest the luminaire b. Disconnect should be located within sights of luminaire c. A permanent plaque or directory shall be installed at the luminaire d. The overcurrent protection device for the branch circuit serving the luminaire is sufficient for the disconnect.
b. Disconnect should be located within sights of luminaire
Edison based fuse are prohibited: a. In a 208 volt system b. For new work in all buildings c. In residential occupancies for existing work d. In commercial occupancies for existing work
b. For new work in all buildings
Where a building or structure is supplied by more than the one service, which of the following shall be installed? a. Fire pump b. Permanent Plaque c. Emergency system d. Optional standby system
b. Permanent Plaque
Terminals that are used for electrical connection of more than 1 conductor are: a. Prohibited b. Required to be so identified c. Required to have all the conductors sized 12 AWG or smaller d. Required to have all the conductors under the terminal to be the same size
b. Required to be so identified
Is a balcony that is attached to and accessible from inside a dwelling required to have a receptacle outlet? a. No b. Yes, in all cases c Yes, but only where the balcony has a total of more than 20 ft. squared d. Yes, but only where the balcony is located more than 6.5 feet above grade (or ground) e. Yes, but only during Mardi Gras for bead throwing and upskirt shots. :)
b. Yes, in all cases
Which of the following is correct for control of illumination of working space about electrical equipment? a. illumination shall be controlled by an occupancy sensor b. illumination shall NOT be controlled by automatic means only c. if the equipment operates at less than 1,000 volts, auto control only is permitted d. If the equipment operates at more than 1,000 volts, automatic control is not permitted, even with a manual overide switch installed
b. illumination shall NOT be controlled by automatic means only
For feeders of 240 volts, the grounder conductor, which is part of the feeder, but NOT connected to an overcurrent device shall be permitted to be sized at __________ percent of the continuous & non-continuous load? a. 80 b. 90 c. 100 d. 125
c. 100
Given: on a three phase panel serving outdoor lighting, the individual phase loads are 5 amps ( phase 1) , 10 amps ( phase 2), and 15 amps, (phase 3). What is the minimum ampacity required for the common neutral of the outside feeder servicing the lighting load? a.15 amps b.15X1,732 amps c. 30 amps d. 3 of 1,732 amps
c. 30 amps
What is the max number of 6 AWG XHHW conductors permitted in a 3/4" EMT? a. 2 b. 3 c. 4 d. 5
c. 4
Which of the following square metal junction boxes is the smallest size allowed for containing 12 AWG conductors? a. 4"x1-1/4" b. 4"x1-1/2" c. 4"x2-1/8" d. 4-11/16"x1-1/4"
c. 4"x2-1/8"
2 means shall be provided to reduce the residual voltage of a capacitor to _______ or less within _______ often the capacitor is disconnected from the source of supply of over 600 volts. a. 30 volts, 60 seconds b. 30 volts, 2 minutes c. 50 volts, 5 minutes d. 120 volts, 10 seconds
c. 50 volts, 5 minutes
Raceways exposed to sunlight on rooftops shall be installed a minimum distance of _________ inches above the roof to the bottom of the raceway without derating the conductors. a. 1/2 b. 3/4 c. 7/8 d. 2
c. 7/8
Using the standard load calculation method, for all , sq. ft. house that has all major gas appliances and the minimum scale appliance and laundry loads, the calculating load is _________ VA. a. 5100 b. 6300 c. 9000 d. 1200
c. 9000
Auxiliary gutters installed outdoors shall be listed for all of the following conditions except: a. Use in wet conditions b. Exposure to sunlight c. Exposure to chemicals d. Maximum ambient temp of the installation
c. Exposure to chemicals
Equipment grounding conductors require mechanical protection as well as a. high resistance ampacity b. Flame retardant insulation c. High impedence capacity d. Adequate ground faultl current carrying capacity
c. High impedance capacity
Which of the following requirements is correct regarding a range hood being permitted to be cord and plug connected? a. The circuit shall be rated over 15 amps b. The motor shall be rated at no more than 1/8 horsepower c. Length of cord shall be between 18" and 48" d. The receptacle of hood shall be on a kitchen small appliance circuit.
c. Length of cord shall be between 18" and 48"
Which of the following occupancies requires arc-fault circuit: a. Dentist office b. Child care facilities c. Multi- family dwellings d. Boats and Hoes e. Hookers f. Hospice care facilities
c. Multi- family dwellings
Where cartridge fuses are accessible to other than qualified persons, the code states that a disconnect shall be provided on the supply side when the voltage to ground is __________. a. Any voltage b. Over 110 c. Over 150 d. Over 240 volts
c. Over 150
For storage batteries, a disconnecting means shall be provided for all ungrounded conductors derived from a stationary battery system with a voltage over _______ volts DC. a. 12 b. 24 c. 48 d. 60
d. 60
On a 120/240 volt system installed in a new dwelling unit construction, the frames of ranges and dryers shall be grounded by means of: a. A neutral b. An electrode conductor c. Separate bare bond to a water pipe d. An equipment grounding conductor
d. An equipment grounding conductor
Where a continuous ferrous metal conduit sleeve is used to protect a grounding electrode conductor, the sleeve shall be: a. Threaded on both end b. Identified with green paint. c. Isolated form the grounding-electrode conductor d. Electrically continuous from casement to the ground clamp
d. Electrically continuous from casement to the ground clamp
Conductors for non-power-limited (NPLFA) fire protection signalling systems: a shall be solid only b. Stranded only c. Permitted to be aluminum d. Permitted to be solid or stranded
d. Permitted to be solid or stranded
Which of the following is correct for the surge-protector device (SPD's)? a. SPD's are permitted for circuits over 1,000 volts b. SPD's are required for all class 1, division 1 locations c. SPD's are required for all class 2, division 2 locations d. SPD's are permitted to be connected between the underground conductor and the grounding electrode conductor
d. SPD's are permitted to be connected between the underground conductor and the grounding electrode conductor
Outdoor, rooftop metallic raceway systems containing branch circuits for motors and the HVAC equipment that used non-threaded fittings are required to contain: a. Polyvinyl chloride lining b. Pull string for future circuits c. Minimum 10 AWG equipment grounding conductor d. Wire type equipment grounding conductor
d. Wire type equipment grounding conductor
Are any single conductors with UF insulation permitted to be direct -buried? a. No, not under any circumstances b. No, unless neutral is identified c. Yes, but must be buried 3' deep d. Yes, when all conductors of the same circuit are ran in same trench
d. Yes, when all conductors of the same circuit are ran in same trench
Excluding the equipment grounding conductor, what is the maximum number of 14 AWG THHN conductors permitted in trade size 3/8 flexible metallic conduit with a fitting outside the conduit? a.0 b.2 c.3 d.4
d.4
