Nevada C-2F Residential Wiring Contractor Examination

Per NAC 624.200, a Nevada C-2F residential wiring contractor may install, alter, and repair electrical wires, fixtures, appliances, and apparatuses not exceeding which voltage, and on which structures?

• A150 volts, existing structures of any height
• B300 volts, new one-family dwellings only
• C1,000 volts, any new or existing building
• D600 volts, new or existing structures not more than three stories above ground

A 120-volt dwelling branch circuit supplies a purely resistive 12-ohm heating element. What is the current?

• A10 amperes
• B6 amperes
• C12 amperes
• D14.4 amperes

A 240-volt, single-phase residential water heater draws 18.75 amperes. What is its power?

• A4,500 watts
• B2,250 watts
• C3,600 watts
• D5,000 watts

One horsepower equals which approximate electrical power?

• A100 watts
• B480 watts
• C1,000 watts
• D746 watts

Per NEC 2017 110.26(A)(1) Condition 1, what is the minimum working-space depth in front of a 120/240-volt dwelling panelboard with exposed live parts on one side and no live or grounded parts on the other side?

• A36 inches
• B24 inches
• C42 inches
• D48 inches

Per NEC 2017 110.26(A)(2), the width of the working space in front of a dwelling panelboard shall be the width of the equipment or which minimum, whichever is greater?

• A24 inches
• B36 inches
• C42 inches
• D30 inches

Per NEC 2017 110.26(A)(3), what is the minimum height of the working space in front of indoor dwelling service equipment that is shorter than 6½ feet?

• A6 feet 6 inches
• B5 feet
• C6 feet
• D8 feet

On a 120/240-volt single-phase dwelling service, which conductor identification is required by NEC 2017 Articles 200 and 250?

• AWhite or gray for the equipment grounding conductor and green for the grounded conductor
• BBlack for the grounded conductor and white for ungrounded conductors
• CGreen, green with yellow stripe, or bare for ungrounded conductors
• DWhite or gray for the grounded conductor and green, green with yellow stripe, or bare for…

Two 20-ohm resistive loads are connected in parallel on a 120-volt dwelling circuit. What is the equivalent resistance?

• A10 ohms
• B40 ohms
• C20 ohms
• D5 ohms

Per NEC 2017 110.14(C)(1), unless the equipment is listed and identified otherwise, conductor ampacity at terminals rated 100 amperes or less, or marked for 14 AWG through 1 AWG, is selected from which temperature column?

• A90°C column of Table 310.15(B)(16)
• B110°C column
• C30°C ambient column only
• D60°C column of Table 310.15(B)(16)

Which statement correctly distinguishes Nevada C-2F from C-2A and full C-2?

• AC-2F is the unlimited electrical classification and uses an 80-question PSI exam
• BC-2F is existing-structure wiring only and uses a 60-question PSI exam with NFPA 72
• CC-2F is photovoltaic contracting only and does not include branch-circuit wiring
• DC-2F is residential wiring not over 600 volts on structures not more than three stories,…

In a series circuit, which quantity is the same through every resistive load?

• AVoltage drop
• BPower
• CResistance
• DCurrent

Per NEC 2017 Article 100, a continuous load is a load where the maximum current is expected to continue for how long?

• A30 minutes or more
• B1 hour or more
• C24 hours
• D3 hours or more

Per NEC 2017 110.3(B), listed or labeled equipment shall be installed and used in accordance with which of the following?

• AManufacturer advertising literature only
• BAny method that matches local custom
• CThe newest NEC edition even if Nevada has not adopted it
• DInstructions included in the listing or labeling

A 240-volt single-phase dwelling load is 8,640 watts at 90 percent power factor. What is the current?

• A32 amperes
• B36 amperes
• C48 amperes
• D40 amperes

A 12 AWG copper conductor is 6,530 circular mils. Using K = 12.9, what is the approximate single-phase voltage drop for a 120-volt, 16-ampere dwelling circuit that is 80 feet one-way?

• A2.5 volts
• B3.2 volts
• C5.1 volts
• D7.9 volts

Four 12 AWG current-carrying conductors are installed in a raceway in a 30°C dwelling garage. After the Table 310.15(B)(2)(a) adjustment, what is the maximum 75°C ampacity of each 12 AWG copper conductor before applying 240.4(D)?

• A20 amperes
• B25 amperes
• C30 amperes
• D16 amperes

A 3-story Nevada dwelling has a 120/240-volt service. A C-2F contractor is asked to install a 480-volt, 3-phase feeder to a rooftop commercial-style chiller on a 5-story mixed-use building next door. Which statement is correct?

• AC-2F covers the 480-volt work because it is under 600 volts
• BC-2F covers any building if the contractor uses NEC 2017
• CC-2F does not authorize work on a 5-story structure; that exceeds the three-story residen…
• DC-2F covers the work only if the chiller is existing

Per NEC 2017 210.11(C)(1), a dwelling unit kitchen shall be supplied by at least how many 20-ampere small-appliance branch circuits?

• ATwo
• BOne
• CThree
• DFour

Per NEC 2017 220.52(A), each required 20-ampere small-appliance branch circuit is included in the dwelling feeder or service calculation at which value?

• A1,200 volt-amperes
• B1,440 volt-amperes
• C1,800 volt-amperes
• D1,500 volt-amperes

Per NEC 2017 220.12 and Table 220.12, the general lighting load for a dwelling unit is calculated at which unit load?

• A3 volt-amperes per square foot
• B2 volt-amperes per square foot
• C3.5 volt-amperes per square foot
• D5 volt-amperes per square foot

Per NEC 2017 230.79(C), the service disconnecting means for a one-family dwelling shall have a rating of not less than which of the following?

• A100 amperes, 3-wire
• B60 amperes
• C150 amperes
• D200 amperes

Per NEC 2017 210.11(C)(3), in addition to other required circuits, a dwelling unit shall have at least one 20-ampere branch circuit to supply which outlets?

• ABathroom receptacle outlet(s) required by 210.52(D)
• BBedroom lighting only
• CThe living-room switched receptacle
• DAttic HVAC receptacles only

NEC 2017 added 210.11(C)(4). What does that section require for a dwelling unit with an attached garage?

• AAt least one 120-volt, 20-ampere branch circuit for garage receptacle outlets, with no ot…
• BA 15-ampere lighting circuit that may also feed garage receptacles
• CA 30-ampere individual circuit for each vehicle bay
• DGarage receptacles on the small-appliance circuits

Per NEC 2017 210.52(A)(1), receptacle outlets in habitable dwelling rooms shall be installed so that no point measured horizontally along the floor line of any wall space is more than how far from a receptacle outlet?

• A6 feet
• B4 feet
• C8 feet
• D12 feet

Per NEC 2017 210.52(C)(1), receptacle outlets serving kitchen countertop wall spaces shall be installed so that no point along the wall line is more than which distance from a receptacle outlet?

• A24 inches
• B12 inches
• C36 inches
• D48 inches

Per NEC 2017 210.52(C)(2), at least one receptacle outlet shall be installed at a dwelling kitchen island countertop that has which minimum dimensions?

• ALong dimension 24 inches or greater and short dimension 12 inches or greater
• B12 square feet or greater only
• CFirst 9 square feet plus one receptacle per additional 18 square feet
• DAny island, regardless of size

Per NEC 2017 210.8(A), which dwelling 125-volt, 15- and 20-ampere receptacles require GFCI protection?

• ABathrooms, garages, outdoors, crawl spaces, unfinished basements, kitchen countertops, si…
• BBedrooms and living rooms only
• COnly bathrooms and outdoors
• DOnly unfinished basements and crawl spaces

Per NEC 2017 210.12(A), AFCI protection is required for 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets or devices in which dwelling locations?

• AKitchens, family rooms, dining rooms, living rooms, parlors, libraries, dens, bedrooms, s…
• BBathrooms, garages, and outdoors only
• CUnfinished basements and crawl spaces only
• DAttached garages and accessory buildings only

Per NEC 2017 230.70(A)(1) and (A)(2), the service disconnecting means shall be installed at a readily accessible location nearest the point of entrance of the service conductors and shall not be located where?

• AIn a bathroom
• BOn an exterior wall
• CIn a garage
• DIn a laundry room

Per NEC 2017 230.24(B), overhead service-drop conductors above a residential driveway shall have a minimum vertical clearance of which of the following?

• A8 feet
• B10 feet
• C12 feet
• D18 feet

Per NEC 2017 210.4(B), each multiwire branch circuit shall be provided with a means that will simultaneously disconnect which conductors at the point where the branch circuit originates?

• AThe grounded conductor only
• BThe equipment grounding conductor only
• CAll ungrounded conductors
• DOne ungrounded conductor

Per NEC 2017 210.52(E)(1), a one-family dwelling shall have at least one receptacle outlet readily accessible from grade and not more than 6½ feet above grade, installed where?

• AAt the front only
• BAt the back only
• CIn the front and back of the dwelling
• DAt the service equipment only

A one-family dwelling has 1,800 square feet of floor area. Using NEC 2017 220.12, 220.52(A), and 220.52(B), what is the connected general lighting, small-appliance, and laundry load before demand factors?

• A5,400 VA
• B8,400 VA
• C9,900 VA
• D12,000 VA

Using the NEC 2017 standard method, apply 220.42 dwelling demand factors to a 9,900 VA general lighting, small-appliance, and laundry load. What is the demand load for that portion?

• A5,415 VA
• B9,900 VA
• C3,465 VA
• D7,200 VA

A 1,800-square-foot one-family dwelling (120/240-volt, 3-wire, 100-ampere or larger) has these connected loads: general lighting 5,400 VA; two small-appliance circuits and one laundry circuit; 12 kVA range; 4.5 kVA water heater; 5 kVA dryer; 1.2 kVA dishwasher; 0.8 kVA disposal; 6 kVA air conditioner; 4 kVA heat. Using NEC 2017 220.82 optional method, what is the calculated service load?

• A25,360 VA
• B21,360 VA
• C33,400 VA
• D39,400 VA

Per NEC 2017 Table 220.55 and Note 1, what demand load is used for a single 14 kW household electric range on a dwelling service calculation?

• A8.8 kW
• B8 kW
• C12 kW
• D14 kW

Per NEC 2017 220.54, a household electric clothes dryer not given a nameplate rating in the calculation shall be calculated at not less than which load?

• A3,000 watts
• B4,500 watts
• C5,000 watts
• D8,000 watts

Per NEC 2017 Table 250.122, what is the minimum copper equipment grounding conductor for a 20-ampere dwelling branch circuit?

• A14 AWG
• B8 AWG
• C10 AWG
• D12 AWG

Per NEC 2017 Table 250.122, what is the minimum copper equipment grounding conductor for a 200-ampere dwelling feeder?

• A8 AWG
• B2 AWG
• C4 AWG
• D6 AWG

Per NEC 2017 Table 250.66, what is the minimum copper grounding electrode conductor for a 200-ampere dwelling service that uses 2/0 AWG copper ungrounded service-entrance conductors?

• A8 AWG copper
• B6 AWG copper
• C4 AWG copper
• D2 AWG copper

Per NEC 2017 250.53(G), a rod electrode shall be at least which length, and if a rock bottom is encountered the rod may be driven at not more than 45 degrees from vertical or buried in a trench at least how deep?

• A6 feet long; 12-inch trench
• B8 feet long; 6-inch trench
• C10 feet long; 4-foot trench
• D8 feet long; 2.5-foot trench

Per NEC 2017 250.53(A)(2), a single rod, pipe, or plate electrode shall be supplemented by an additional electrode unless the single electrode has a resistance to earth of how many ohms or less?

• A5 ohms
• B10 ohms
• C25 ohms
• D50 ohms

Per NEC 2017 250.52(A)(3), a concrete-encased electrode shall consist of at least 20 feet of one of the following. Which choice is compliant?

• A20 feet of 8 AWG bare copper
• B20 feet of 6 AWG aluminum
• C10 feet of 1/2-inch rebar
• D20 feet of electrically conductive steel reinforcing bars not less than 1/2 inch in diame…

Per NEC 2017 250.24(A)(5) and 250.142(B), which statement is correct for a dwelling subpanel supplied by a feeder?

• AThe grounded conductor shall be bonded to the subpanel enclosure and to the equipment gro…
• BThe main bonding jumper shall be installed in every subpanel
• CNo equipment grounding conductor is required if the feeder raceway is PVC
• DThe grounded conductor shall not be connected to normally non-current-carrying metal part…