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Electrician Practice Test

Take a free Electrician Practice Test to study for your electrician license exam.  

Most states require an electrician to pass an exam to receive a journeyman or master electrician license.   State exams cover such areas as Electrical Theory, Trade Knowledge, Grounding and Bonding, Wiring Methods and Installation, Overcurrent Protection, Load Calculations, etc. This practice test is broken into sections (Journeyman and Master) and is based on the 2020 NEC and 2023 NEC where indicated.  

To prepare for your actual Electrician Exam, these two practice exams by Ray Holder (Master Electrician and Certified Electrical Trade Instructor) have 300 questions with fully explained answers:

With Tests.com, you have the option to purchase a practice test kit based on the 2014, 2017, 2020 or 2023 National Electrical Code (NEC). Check with your local code official to determine which code applies to your exam. Use our interactive test platform to simulate the exam. Take as many tests as you need and there are no recurring charges.

For more free practice and test prep, see the following electrician exams:

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Journeyman Electrician (2020 NEC) 

1 Where insulated power and lighting conductors are installed in raceways, an ampacity adjustment must be applied where _____.

 I. there are more than three (3) current-current carrying conductors in the same raceway         
II. an ambient temperature other than 86°F is encountered
Incorrect. Please choose another answer.
Part III of Article 310- Conductors for General Wiring, covers the general installation requirements for conductors rated up to and including 2000 volts. Section 310.14(B) tells the reader the ampacity of each conductor within a raceway needs to be corrected for ambient temperatures other than 30°C (86°F). Using the values shown in Table 310.15(B)(1), multiply the ampacities of the conductors specified in the ampacity tables by the appropriate correction factor shown in Table 310.15(B)(1) to correct the ampacities of the conductors. Also, Section 310.14(C) tell us the ampacity of each conductor is to be adjusted as shown in Table 310.15(C)(1) where the number of current-carrying conductors within a raceway or cable exceeds three. Again, multiply the conductor ampacities as shown in the ampacity tables by the percentage values given in Table 310.15(C)(1).

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2 According to the Code, flexible metal conduit (FMC) enclosing circuit conductors is not approved for use as a type of an equipment grounding conductor in lengths exceeding _____.
Incorrect. Please choose another answer.
Part VI of Article 250 explains the wiring methods and installation requirements for equipment grounding and equipment grounding conductors. Section 250.118 lists the approved types of equipment grounding conductors. 250.122(5)d. specifies where flexible metal conduit (FMC) is longer than 6 ft. it is not considered an effective ground-fault current path.
3 Where a single 125-volt, single-phase, 20-ampere receptacle outlet located in an attached garage of a dwelling unit is provided for a central vacuum assembly, the receptacle outlet is required to have _____.
Incorrect. Please choose another answer.
Article 210 provides the general requirements for branch circuits. Section 210.8(A)(2) requires all 125-volt through 250-volt, single-phase receptacles installed in residential garages to be provided with ground-fault protection for personnel. There are no exceptions to this rule, the receptacles must be provided with GFCI protection for the user of appliances or other equipment regardless of where the receptacle is located in the garage.
4 Where Type NM cable is used as the wiring method for "home runs" for power and lighting branch circuits in a dwelling, the minimum size copper required is _____.
Incorrect. Please choose another answer.
The uses and ampacity ratings of conductors for general wiring are found in Article 310. Section 310.3 specifies the minimum size of conductors for general wiring shall be 14 AWG copper or 12 AWG aluminum except as permitted elsewhere in the Code.

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Master Electrician Practice Test

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5 When single-phase, 125-volt, 15- or 20-ampere receptacles are housed in a device box located outdoors in a wet location, the receptacles shall have an enclosure that is listed as _____ whether or not the attachment plug cap is inserted.
Incorrect. Please choose another answer.
Article 406 covers the rating and installation of receptacles. Section 406.9(B)(1) addresses the installation of receptacles of 15- and 20-amperes placed in a wet location and specifies where the plug-and-cord connection to receptacles is in a wet location, the enclosure is required to be weatherproof regardless of whether or not the plug is inserted.
6 For one-family dwellings supplied by a single-phase, 120/240-volt system, and having a 200-ampere rated inverse time circuit breaker for the main disconnecting means, what minimum size THWN aluminum conductors are permitted for use as ungrounded service-entrance conductors? Given: No adjustment or correction factors are required.
Incorrect. Please choose another answer.
Section 310.12 of Article 310, Conductors for General Wiring, permits the values given in Table 310.12 for use when sizing service and feeder conductors under this condition. The table indicates size 4/0 AWG aluminum conductors are the smallest size permitted for a 200-ampere rated service if no adjustment or correction factors are applied. Note, the service-entrance conductors for dwellings, under this condition, is reduced in size in relation to service-entrance conductors for commercial and industrial occupancies due to the dwelling unit's diversified load.
7 If a 1¾ in. deep, single-gang, Type FS device box houses a duplex receptacle, how many insulated size 12 AWG conductors are permitted to be enclosed in the FS box?
Incorrect. Please choose another answer.
Article 314 governs the installation and use of all outlet and device boxes. Table 314.16(A) shows six (6) size 12 AWG conductors are permitted in the FS box however, Section 314.16(B)(4) tell us the number of conductors allowed in the box shall be reduced by two (2) due to the receptacle contained in the FS box. Therefore, the box is permitted to have only four (4) size 12 AWG conductors.

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8 The required 15- or 20-ampere receptacle outlet for a peninsular countertop or work surface in the kitchen of a dwelling must be located not further than _____from the outer edge of the peninsular countertop.
Incorrect. Please choose another answer.
Part III of Article 210 provides the general requirements for the required 125-volt, single-phase 15- and 20-ampere receptacle outlets in a dwelling unit. Section 210.52(C)(2)(b) specifies at least one receptacle outlet shall be located within 2 feet of the outer end of a peninsular countertop or work surface. Additional required receptacle outlets are permitted to be located as determined by the installer, home owner, or builder. This rule eliminates the need for extension cords.
9 In compliance with the rules established by the NEC®, all 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlet or devices in specific areas or rooms of a dwelling unit shall be provided with arc-fault circuit-interrupter protection. Where Type NM cable is used as the wiring method for "home runs" in the dwelling, the maximum length of the cable from the overcurrent device to the first outlet shall not exceed _____ for size 14 AWG NM cable and _____ for size 12 AWG NM cable.
Incorrect. Please choose another answer.
Section 210.12 of Article 210, Branch Circuits, explains the rules for AFCI protection of 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets or devices in a dwelling unit. 210.12(A)(4)b. calls for the conductors to have length restrictions to the first outlet from the overcurrent device, based on the size of the conductors; 50 feet for 14 AWG and 70 feet for 12 AWG conductors. This rule is in place to restrict voltage-drop and prevent nuisance tripping of the overcurrent protection device.
10 The Code mandates a clearly labeled emergency disconnect is to be provided at each service for one- and two-family dwelling units. The emergency disconnect is permitted to be installed _____.
Incorrect. Please choose another answer.
The rules for service equipment and service conductors and their installation requirements are found in Article 230. Section 230.85 tells the reader the required emergency disconnect provided for one- and two-family dwellings is to be installed in a readily accessible outdoor location. This mandate was established because of the need for first responders and utility personnel to have a way to safely remove power from the house in an emergency.

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Journeyman Electrician (2023 NEC) 

11 A general Code rule is, as viewed from the front of a switchboard or panelboard the _____ be the phase having the higher voltage to ground on 3-phase, 4-wire delta-connected systems.
Incorrect. Please choose another answer.
The high-leg, the phase having the higher voltage to ground, is common on a 240/120-volt, 3-phase, 4-wire center tap grounded system and Section 408.3(E)(1) explains the high leg must be designated as the “B phase”. Section 110.15 requires the high leg to be identified and marked as orange in color or another effective means of identification, because the high leg voltage can be 208-volts. This identification is intended to prevent problems caused by the lack of standardization where metered and nonmetered equipment are installed in the same installation.

The exception to 408.3(E)(1) recognizes the fact that metering compartments supplied by utility companies have been standardized with the high leg as the “C phase” rather than the “B phase”. When encountering a panelboard or switchboard, electricians should always test each phase to ground to determine if a high leg is present.
12 Which of the following single-phase receptacle outlets in a dwelling are required to have ground-fault protection for personnel?
Incorrect. Please choose another answer.
Section 210.8(A) tells us, all 125-volt through 250-volt receptacles installed  in locations specified in 210.8(A)(1) through (A)(11) and supplied by single-phase branch circuits rated 150 volts or less to ground are required to have GFCI protection. This means all 125-volt through 250-volt receptacles require GFCI protection where installed to serve kitchen countertop surfaces, where installed within 6 ft. from the top inside edge of the bowl of the sink, and where installed in laundry areas.  Wet clothes and puddles of water can pose a shock hazard to anyone using any appliance in a laundry area.
13 Where one- and two family dwellings are supplied with a single-phase, 120/240-volt electrical system from the local utility company and the service demand load is not more than 400 amperes, for sizing the ungrounded (phase) service-entrance conductors, the conductors shall be permitted to have an ampacity of not less than _____ of the values shown in Table 310.16
Incorrect. Please choose another answer.
Residential service-entrance conductors are permitted to be sized at slightly higher ampacity values than the ampacity values found in Table 310.16 primarily due to the diversity of loads associated with dwelling units.  Therefore, Section 310.12(A) allows the service-entrance conductors to have an ampacity not less than 83% of the service rating and the values given in Table 310.12(A) are permitted to be applied.

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14 Where four (4) or more current-carrying conductors are installed in a common raceway, the ampacity of each current-carrying conductor must be determined by applying the percentage values as given in Table _____ of the Code.
Incorrect. Please choose another answer.
The percentage values shown in Table 310.15(C)(1) are to be applied to the ampacity (current-carrying capacity) of conductors when four (4) or more current-carrying conductors are installed in the same raceway or cable.  When more than three (3) current carrying conductors are in a common raceway or cable, the temperature rises inside the conduit or cable because each current-carrying conductor adds to the heat inside the conduit or cable and conductors which are close together cannot dissipate the heat as well as evenly spaced conductors. This has the same effect on the insulation of a conductor as elevated ambient temperature.  Therefore, the ampacity of each of the current-carrying conductors in the raceway is reduced.
15 Where an inverse-time circuit breaker is used as a disconnecting means for an air-conditioning unit, the ampere rating of the circuit breaker shall be not less than _____ of the A/C nameplate rated-load current or branch-circuit selection, whichever is greater.
Incorrect. Please choose another answer.
In order for the hermetic motor-compressor to start without tripping the  circuit breaker used as the disconnecting means, Section 440.12(A)(1) requires the ampere rating of the disconnecting means to be at least 115% of the motor-compressor nameplate rated-load current or branch-circuit selection, whichever is greater.
16 What is the required size 75°C copper service-entrance conductors for a 200-ampere, 120/240-volt, single-phase commercial service where elevated ambient temperature is not a concern?
Incorrect. Please choose another answer.
You should have selected 3/0 AWG. Table 310.16 gives the ampacities of insulated conductors of 0 through 2000 volts with not more than three current-carrying conductors in a raceway or cable, and the wiring is installed in a 30°C (86°F) ambient temperature environment.  Where the conductors are installed in a location where the ambient temperature is other than 86°F, you are required to apply the correction factor values shown in Table310.15(B)(1)(1), based on the operating temperature of the conductors and the ambient temperature.  Where a raceway or cable contains more than 3 current-carrying conductors, the adjustment factor values indicated in Table 310.15(C)(1) are to be implemented. Notice the adjustment factors of the conductors shown in this table are not applicable where the raceway or cable has a length not exceeding 24 in. [310.15(C)(1)(b)]

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17 In reference to the mechanical execution of electrical work, the 2023 edition of the NEC states, electrical equipment shall be installed _____.
Incorrect. Please choose another answer.
As per Section 110.12, electrical equipment shall be installed in a professional and skillful manner. The attention to this section in the Code reminds us how important it is to be a professional and take pride in our work. The decision of how professional and skillful an installation is performed is ultimately a judgment call made by the local inspector having jurisdiction.
18 Ceiling-suspended (paddle) fans weighing more than _____ shall be supported independently of the outlet box.
Incorrect. Please choose another answer.
Article 314 covers the installation and use of outlet, device, and pull boxes depending on their use.  Section 314.27(C) specifically addresses boxes at ceiling-supported (paddle) fan outlets.  Outlet boxes specifically listed to support ceiling-mounted paddle fans are to be marked by their manufacturer as suitable for this use and shall not support ceiling-suspended (paddle) fans that weigh more than 70 pounds.  Outlet boxes used to support ceiling-suspended (paddle) fans that weigh more than 35 pounds are to be marked indicating the maximum weight to be supported.
19 Where a 112½ kVA transformer having a single-phase, 120/240-volt secondary is installed at a multifamily dwelling unit, the full-load current rating, in amperes, of the secondary is ____.
Incorrect. Please choose another answer.
To find the full-load current rating of the secondary terminals on the single- phase transformer, apply the single-phase current formula as shown:
 
          I = 112.5 kVA x 1000  = 112,500  = 468.75 amperes 
                     240 volts               240

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Master Electrician (2020 NEC) 

20 No grounded conductor shall be attached to any terminal or lead so as to _____ the designated polarity.
Incorrect. Please choose another answer.
The rule established by Section 200.11 does not permit the grounded (neutral) conductor to be attached to any terminal or lead so as to reverse the designated polarity.  The intent of this rule is to prevent a grounded (neutral) conductor from being attached to an ungrounded (hot) terminal or lead which creates a shock hazard or a ground-fault.
21 In compliance with the Code, liquidtight flexible metal conduit (LFMC) enclosing power and lighting circuit conductors is not considered an effective ground-fault current path where the length of the LFMC exceeds _____.
Incorrect. Please choose another answer.
Part VI of Article 250 covers the wiring methods and installation requirements for equipment grounding and equipment grounding conductors. Section 250.118 lists the approved types of equipment grounding conductors and liquid-tight flexible metal conduit (LFMC) is included in the list. However, 250.122(6)d. tells the reader where the flex is longer than 6 feet it is not considered an effective type of equipment grounding conductor and a wire-type equipment grounding conductor needs to be installed.
22 For a 3-phase, continuous duty, induction-type motor, Table 430.250 is not used to determine the _____ for the motor.
Incorrect. Please choose another answer.
Article 430 covers motors, motor conductors, motor protection, motor controllers, motor control circuits, and motor control centers. Section 430.6(A)(1) explains for a motor of this type, Table 430.250 that shows the full-load current (FLC) of motors, shall be used to determine the ampacity of conductors or ampere ratings of switches, branch-circuit short-circuit and ground-fault protection, instead of the actual ampere rating marked on the motor nameplate. Section 430.6(A)(2) indicates the ampere rating (FLA) provided on the motor nameplate is used to size the overload protective devices that protects the motor, motor controller, and motor branch-circuit conductors. Overloads are not a fault condition, overloads happen when there is excessive current in the circuit. An overload is where the current is more than the equipment ampere rating and the overload may result in overheating and damaging equipment. Overload protection does not protect against short-circuits or ground-fault currents.

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23 As specified in the Code, where are you required to make the connection between the equipment grounding conductor and the grounded neutral conductor at a 208Y/120-volt, 3-phase, 4-wire service?
Incorrect. Please choose another answer.
Part II of Article 250 addresses the general requirements for system grounding and bonding of alternating-current systems to be grounded. Section 250.24(B) requires an unspliced main bonding jumper to connect the equipment grounding conductor and the service disconnect enclosure to the neutral (grounded conductor) within the enclosure. The size of the main bonding jumper is determined in accordance with Table 250.102(C)(1).
24 Given: A hot tub is to located in the common area of a multifamily dwelling unit; a clearly labeled emergency shutoff or control switch for the purpose of stopping the motor(s) of the water recirculation and jet system is required to be installed for the users at a readily accessible location and NOT less than _____ from the hot tub.
Incorrect. Please choose another answer.
The provisions of Article 680 apply to the installation and wiring methods of storable or permanently installed swimming pools, hot tubs and spas, and to their metallic auxiliary equipment, such as pumps and similar equipment. Section 680.41 in Part II of Article 680 was initiated because, a local disconnecting device, not less than 5 ft. away from the hot tub, that is capable of being used in an emergency is needed for hot tubs and spas to allow rapid disconnection if someone becomes entrapped by the water recirculation system intake.
25 The disconnecting means for air-conditioning or refrigeration equipment shall NOT be located _____.
Incorrect. Please choose another answer.
Article 440 applies to air-conditioning and refrigeration equipment and to branch circuits and controllers for the equipment. Section 440.14 prohibits the disconnecting means to be located on panels that are designed to allow access to the equipment or to obscure the equipment nameplate.

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26 The required support distance for exposed vertical rigid metal conduit (RMC) risers from industrial machinery or fixed equipment, where the RMC is made up with threaded couplings, the conduit is supported and securely fastened at the top and bottom of the riser, and no other means of intermediate is readily available is ___.
Incorrect. Please choose another answer.
The rules regarding the use and installation of rigid metal conduit (RMC) are found in Article 344. As per Section 344.30(A), as a general rule, RMC is required to be supported least every 10 feet and within 3 feet of each outlet box, junction box, panelboard or any similar cabinet unless otherwise permitted by 334.30(B). Section 334.30(B)(3) permits the exposed vertical risers of RMC from industrial machinery or fixed equipment to be supported at intervals of 20 feet when the conduit has threaded couplings, fastened at the top and bottom of the riser, and no other means of immediate support is readily available.
27 When installing an emergency back-up generator with an output of 22 kW, single-phase, 120/240-volts for a farm house, the ampacity of phase conductors from the generator terminals to the first overcurrent protective device shall not be less than ____ of the nameplate current rating of the generator where the design of the generator does not prevent overloading.
Incorrect. Please choose another answer.
Article 445 contains installation and other requirements for generators. Section 445.13 specifies, the ampacity of the conductors from the generator terminals to the first overcurrent protection shall not be less than 115 percent of the nameplate current rating of the generator. Apply the single-phase current formula to solve this problem. I = P ÷ E

  I =  22 kw x 1000  = 22,000  = 92 amperes x 1.15 = 106 amperes
          240 volts            240
 
28 For freestanding type, cord-and plug connected office furnishings, which of the following is NOT permitted?
Incorrect. Please choose another answer.
Article 605 covers electrical equipment, wiring methods and conductors installed in office furnishings. Section 605.9(D) does not permit an individual office furnishing to contain multiwire circuits. Although multiwire branch circuits are not permitted in cord-connected office furnishings, they may be supplied by one phase of a multiwire branch circuit.

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29 According to the Code, flexible metal conduit (FMC) enclosing circuit conductors is not approved for use as a type of an equipment grounding conductor in trade sizes larger than _____.
Incorrect. Please choose another answer.
Part VI of Article 250 explains the wiring methods an installation requirements for equipment grounding and equipment grounding conductors. Section 250.118 lists the approved types of equipment grounding conductors. 250.118(5)c. specifies where flexible metal conduit (FMC) exceeds trade size 1¼ in. it is not approved for use as an equipment grounding conductor and an additional wire-type equipment grounding conductor needs to be installed in the flex.
30 What is the MINIMUM size wire-type copper equipment grounding conductor required for a 20-ampere rated branch circuit installed in PVC conduit that supplies a swimming pool pump motor?
Incorrect. Please choose another answer.
Part II of Article 680 applies to the rules governing the installation and wiring methods of permanently installed swimming pools. Section 680.21(A) mandates when wiring a swimming pool pump motor, the raceway containing the supply conductors shall also contain an insulated copper equipment grounding conductor not smaller than 12 AWG in order to have an effective ground-fault path.

Master Electrician (2023 NEC) 

31 Where installed for services of 1000 volts or less, Type 1 SPDs shall be connected to _____.
Incorrect. Please choose another answer.
Part II of Article 242 (Overcurrent Protection) covers surge-protective devices (SPDs) permanently installed on premises wiring systems of not over 1000 volts. Type 1 SPDs are to be connected to the supply side of the service disconnect.  In Section 242.13(B)(1)-(4), the Code gives four locations for connecting the SPD grounding lead and any of these locations are acceptable.

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32 Where size 4 AWG THW copper conductors are connected to termination lugs having a temperature rating of 60 in a panelboard, what is the ampacity of the conductors?
Incorrect. Please choose another answer.
The ampacity of a conductor is to be selected from the column of Table 310.16 that corresponds with the metallic element, insulation and temperature rating of the conductor. The 75°C column of Table 310.16 conveys the size 4 AWG THW copper conductors have an ampacity of 85 amperes.  However, in compliance with the rules in Section 110.14(C), since the conductors are connected to 60°C terminations, the ampacity must be selected from the 60°C column, that shows the ampacity of the size 4 AWG conductors to be 70 amperes.  The weak point of any electrical system is where conductors are spliced or terminated. The temperature rating of the conductor, metallic element, along with the size of the conductor determines how much current it is permitted to carry, but it cannot be greater than the temperature rating of the termination points.
33 The dedicated equipment space above outdoor installed switchgear, panelboards and motor control centers, of 1000 volts or less, extends from final grade to a height of not less than _____ above the equipment. This space is dedicated for the electrical installation.
Incorrect. Please choose another answer.
As indicated in Section 110.26(E)(1)(c) the dedicated equipment space for outdoor installed switchgear, panelboards and motor control centers shall be equal to the width and depth of the equipment and extends to a height of 6 ft. above the equipment.  No gas piping, ductwork, water piping, refrigeration lines, irrigation equipment, compressed air lines and other non-electrical equipment is permitted to be installed in this space. This space above and below the equipment is dedicated for the electrician to install electrical raceways in and out of the equipment.
34 As a general NEC rule, where ambient temperature, voltage drop, and the number of current-carrying conductors are not a factor, what size 75 copper ungrounded (phase) feeder conductors are required to supply a 200 ampere continuous load?
Incorrect. Please choose another answer.
Article 215 introduces the installation requirements, sizing, and overcurrent protection for feeder conductors not over 1000 volts. Section 215.2(A)(1)(a) requires feeder conductors to have an ampacity of not less than 125% of the continuous load, plus 100% of the continuous load.
            
            200 amperes x 125% = 250 amperes
          
Therefore, size 250 kcmil 75 copper feeder conductors with an ampacity of 255 amperes should be selected from Table 310.16.

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35 Given: A commercial occupancy is to be supplied from a transformer having a 480Y/277-volt, three-phase primary and a 208Y/120-volt, three-phase secondary. The secondary will have a balanced computed connected demand load of 416 amperes per phase. The transformer is required to have a kVA rating of at least _____.
Incorrect. Please choose another answer.
As addressed in Section 250.64(D)(1), for a service or feeder with two or more disconnecting means in separate enclosures supplying a building or structure, a common grounding electrode conductor and grounding electrode conductor taps shall be installed. A grounding electrode conductor shall extend to the inside of each disconnecting means enclosure.  The tap conductors are to be connected to the common electrode conductor.  Section 250.64(D)(1)(3) recognizes a method of connections to an accessible copper or aluminum busbar with minimum dimensions of ¼ inch thick by 2 inches wide as an acceptable method to connect the taps to the common grounding electrode conductor.
36 Where an inverse-time circuit breaker serves as a disconnecting means for a hermetic refrigerant motor-compressor, the circuit breaker is required to have an ampere rating of at least _____ of the nameplate current rating of the equipment or the branch-circuit selection current, whichever is greater.
Incorrect. Please choose another answer.
The provisions of Part II in Article 440, gives the requirements for the disconnecting means for air conditioning and refrigerating equipment.  As noted in Section 440.12(A)(1), the disconnecting means shall have an ampere rating of at least 115% of the nameplate rated-load current of the equipment or branch-circuit selection current, whichever is greater.
37 Given: You are to install an underground run of trade size 2 in. Schedule 40 PVC conduit containing 120/240-volt, single-phase service-entrance conductors supplying a one-family dwelling. The PVC will not cross under any public streets, roads, driveways or alleys. The conduit is to have a burial depth of at LEAST _____ from final grade.
Incorrect. Please choose another answer.
The minimum burial depth requirements for conductors and cables not exceeding 1000 volts are located in Table 300.5(A) of Article 300. Column 3 of Table 300.5(A) indicates the PVC to have a permitted burial depth of not less than 18 inches from final grade, where the PVC doesn't cross under any public streets, roads, driveways or alleys.

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38 Where four (4) current-carrying size 2 AWG THHN copper conductors are installed in a raceway where the ambient temperature is 100ºF, the ampacity of the conductors is _____.
Incorrect. Please choose another answer.
Before derating, Table 310.16 shows the ampacity of size 2 AWG THHN copper conductors at 86ºF is 130 amperes.  Because of the elevated ambient temperature, 130 amperes is to be multiplied by 0.91, the ambient temperature correction factor in Table 310.15(B)(1)(1), and by 0.80, the adjustment factor in Table 310.15(C)(1), because of the four (4) current-carrying conductors in the raceway.   
 
         Solution: 130 amperes x .91 x .8 = 94.64 amperes
39 When installing underground service conductors for a dwelling where the conductors are not encased in concrete and are buried 18 inches or more below the earth, the conductors are mandated to have the location identified by a warning ribbon that is placed not more than _____ above the underground installation.
Incorrect. Please choose another answer.
As explained in Section 300.5(D)(2), the underground installed service conductors are to have a warning ribbon placed not less than 12 inches above the conductors to have their location identified. This rule is in place, because these circuit conductors are not protected from short circuit and overload. The warning ribbon reduces the risk of an accident, such as an electrocution or an arc-flash incident, when digging near underground service conductors that are not encased in concrete.
40 Determine the required number of 120-volt, 15-ampere general lighting branch circuits for a dwelling unit with 1,950 sq. ft. of habitable space.
Incorrect. Please choose another answer.
Part II of Article 220 provides the calculation methods for branch-circuit loads. Section 220.42, confirms the minimum unit lighting load for dwellings shall not be less than 3 VA per sq. ft.  The minimum lighting load is to be determined using the minimum unit load and the floor area for dwelling occupancies.
 
            First, find the minimum lighting load, in VA:
            3 VA x 1,950 sq. ft. = 5850 VA
 
            Next, find the VA of a 120-volt, 15 ampere circuit:
            120 volts x 15 amperes = 1800 VA
 
            Finally, divide the VA of the load by the VA of the circuit:
 
             5850 VA (load)  = 3.25 = 4, 120-volt, 15 ampere circuits
            1800 VA (circuit)

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Quality starts with who wrote the material. Our writers:

Ray Holder, Electrician Instructor, has worked in the electrical industry for over forty-five years as an apprentice, journeyman, master, field engineer, estimator, business manager, contractor, inspector, consultant and instructor. Mr. Holder holds a Bachelor of Science Degree in Occupational Education and a lifetime Vocational Education teaching certificate from the Texas Education Agency. He is a certified instructor of electrical trades. His classes are presented in a simplified, easy-to-understand format for electricians. Ray is currently the Director of Education for Electrical Seminars, Inc. Ray is an active member of the International Association of Electrical Inspectors, and retired member of the International Brotherhood of Electrical Workers.

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