Nevada C-2A Electrical Wiring Contractor Examination

A resistive heater on an existing 120-volt branch circuit draws 8 amperes. What is the heater resistance?

• A8 ohms
• B15 ohms
• C96 ohms
• D960 ohms

Per NEC Article 100, a continuous load is a load whose maximum current is expected to continue for at least how long?

• A1 hour
• B2 hours
• C3 hours
• D8 hours

A 480-volt, 3-phase panel on an existing building supplies a balanced 30-kilowatt load at unity power factor. What is the line current?

• A36 amperes
• B42 amperes
• C62 amperes
• D125 amperes

On a 4-wire, 120/240-volt, 3-phase, high-leg delta service being upgraded on an existing structure, the high-leg conductor must be identified by which color?

• AWhite
• BGreen
• COrange or other effective means
• DGray

A balanced 480-volt, 3-phase existing motor feeder carries 40 amperes at 0.85 power factor. What is the true power?

• A16.3 kW
• B19.2 kW
• C28.3 kW
• D33.3 kW

An existing 240-volt, single-phase electric furnace is nameplated 12 kW at unity power factor. What is the load current used for branch-circuit calculations?

• A25 amperes
• B50 amperes
• C58 amperes
• D100 amperes

Two equal resistive loads are reconnected from series to parallel on the same existing 120-volt source. What happens to source current?

• AIt stays the same
• BIt doubles
• CIt becomes four times as large
• DIt falls to one-fourth

In a dwelling being rewired, receptacle outlets along an unbroken wall space in a habitable room must be installed so that no point along the floor line is more than how far from a receptacle?

• A4 feet
• B6 feet
• C8 feet
• D12 feet

NEC 210.11(C)(1) requires at least how many 20-ampere small-appliance branch circuits for the kitchen, pantry, breakfast room, dining room, or similar area of a dwelling unit?

• AOne
• BTwo
• CThree
• DFour

The bathroom receptacle outlet required by 210.52(D) in an existing dwelling must be supplied by at least one 20-ampere branch circuit. That circuit may also supply which of the following?

• AReceptacle outlets in other bathrooms, and in one bathroom it may also supply other equip…
• BKitchen counter receptacles on the same floor
• CThe dwelling laundry receptacle
• DOutdoor receptacles at the front and rear

Under the 2017 NEC, an attached dwelling garage that is being rewired must have at least one 120-volt, 20-ampere branch circuit that supplies garage receptacle outlets. Which additional outlets may that required circuit also supply?

• AReadily accessible outdoor receptacle outlets
• BKitchen small-appliance receptacles
• CThe bathroom GFCI receptacle
• DInterior lighting outlets in habitable rooms

When adding receptacle outlets in the laundry area of an existing dwelling, GFCI protection is required by which 2017 NEC provision?

• A210.8(A)(5) unfinished basements only
• B210.8(A)(10) laundry areas
• C210.8(B) other than dwelling units
• DGFCI is not required for laundry receptacles in the 2017 NEC

A 2,200-square-foot existing one-family dwelling is being rewired. Using the standard calculation, what is the general lighting and receptacle demand load (including the two small-appliance and one laundry circuits) before adding fixed appliances?

• A3,000 VA
• B5,835 VA
• C6,600 VA
• D11,100 VA

A 120-volt branch circuit on an existing structure supplies a 16-ampere noncontinuous load 90 feet from the panel. Using copper (K = 12.9) and 12 AWG (6,530 circular mils), what is the approximate voltage drop?

• A2.8 volts
• B4.1 volts
• C5.7 volts
• D8.3 volts

An existing store lighting load is 16 amperes and is continuous. What is the minimum branch-circuit conductor ampacity and the minimum overcurrent-device rating before applying any other adjustment?

• A16-ampere conductors and a 15-ampere breaker
• B16-ampere conductors and a 20-ampere breaker
• C20-ampere conductors and a 20-ampere breaker
• D32-ampere conductors and a 30-ampere breaker

The minimum size of the grounding electrode conductor at a service is selected from which NEC 2017 table?

• ATable 250.66
• BTable 250.122
• CTable 310.15(B)(16)
• DTable 430.250

An equipment grounding conductor run with a feeder is sized from which table?

• ATable 250.66
• BTable 250.122
• CTable 250.102(C)(1) only
• DChapter 9, Table 8

A concrete-encased electrode (Ufer) complying with 250.52(A)(3) must include at least how much bare copper conductor or reinforcing bar encased in concrete?

• A8 feet of 5/8-inch rod
• B10 feet of 4 AWG copper
• C20 feet of 1/2-inch reinforcing bar or 4 AWG copper conductor
• D25 feet of water pipe

A single rod, pipe, or plate electrode is installed at an existing-building service. A supplemental electrode is not required if that single electrode has a resistance to earth of:

• A25 ohms or less
• B50 ohms or less
• C100 ohms or less
• DAny measured value, because one rod is always enough

Where an interior metal water pipe is used as a grounding electrode conductor or as the connection path to a metal water-pipe electrode on an existing service, the connection must be made within how many feet of the point of entrance to the building?

• A2 feet
• B5 feet
• C10 feet
• D25 feet

On a 120/240-volt service upgrade at an existing dwelling, the main bonding jumper is required to be installed where?

• AAt the weatherhead only
• BAt each branch-circuit device box
• CIn the service disconnect enclosure, bonding the grounded conductor to the enclosure and…
• DOnly at a remote building supplied by a feeder

An existing service is being rebuilt with 350 kcmil copper ungrounded service-entrance conductors. What is the minimum copper grounding electrode conductor required by Table 250.66 (not a sole connection to a rod, pipe, or plate)?

• A4 AWG copper
• B2 AWG copper
• C1/0 AWG copper
• D3/0 AWG copper

A 400-ampere overcurrent device protects a feeder being added in an existing commercial building. What is the minimum copper equipment grounding conductor required by Table 250.122 if the ungrounded conductors were not increased in size?

• A6 AWG copper
• B4 AWG copper
• C3 AWG copper
• D1/0 AWG copper

A feeder from an existing building supplies a second building. In the usual 250.32(B)(1) installation, grounding at the second building is accomplished by:

• AUsing the grounded conductor as the only grounding means and bonding it to the remote dis…
• BRunning an equipment grounding conductor with the feeder and connecting it to a grounding…
• COmitting any electrode at the second building
• DDriving a single rod and connecting it only to the grounded conductor

An existing two-wire receptacle without an equipment grounding conductor is being replaced in a dwelling. A grounding-type receptacle may be installed if the equipment grounding terminal is connected in accordance with 250.130(C) to an accessible point on which of the following?

• AA water heater bonding jumper in another room only
• BThe grounding electrode system, the grounding electrode conductor, the grounded service c…
• CA nearby telephone ground rod only
• DThe grounded (neutral) conductor at the receptacle

Unless specifically permitted in 240.4(E) or (G), what is the maximum overcurrent protection for a 12 AWG copper conductor after ampacity correction and adjustment?

• A15 amperes
• B20 amperes
• C25 amperes
• D30 amperes

Type NM-B cable used to rewire an existing dwelling has 90°C insulation. The ampacity used to select the conductor size, before applying adjustment and correction, shall be that of which temperature column?

• A60°C
• B75°C
• C90°C
• D105°C

Type NM cable installed in an existing dwelling must be supported and secured at intervals not exceeding 4½ feet and within how many inches of every cabinet, box, or fitting?

• A6 inches
• B8 inches
• C12 inches
• D18 inches

Underground installation of a 120-volt, 20-ampere GFCI-protected residential branch circuit using Type UF or other direct-buried cable, not under a driveway or street, has a minimum cover of:

• A6 inches
• B12 inches
• C18 inches
• D24 inches

Four to six current-carrying conductors in a raceway require which ampacity adjustment factor from Table 310.15(B)(3)(a)?

• A80 percent
• B70 percent
• C50 percent
• DNo adjustment

THHN conductors rated 90°C terminate on a 75°C-rated breaker in an existing panel. The ampacity used to select the conductor for that termination shall be taken from which column of Table 310.15(B)(16)?

• A60°C
• B75°C
• C90°C as the final ampacity
• DThe average of 75°C and 90°C

Which insulation type is suitable for use in a wet location inside an existing underground raceway entering a building?

• ATHHN only (not dual-rated)
• BTHWN or THWN-2
• CTW that has been painted
• DUnlisted fixture wire

Six current-carrying 8 AWG THHN copper conductors are installed in a raceway in a 40°C ambient on an existing rooftop-adjacent run (not on the roof). 8 AWG THHN is 55 amperes at 90°C. The Table 310.15(B)(2)(a) 90°C correction for 36–40°C is 0.91, and the 4–6 CCC adjustment is 80 percent. Terminations are 75°C (50 amperes). What is the allowable ampacity?

• A32 amperes
• B40 amperes
• C44 amperes
• D50 amperes

A metal 4 inch × 4 inch × 1½ inch square box (21.0 cubic inches) in an existing wall contains only 12 AWG conductors, one internal cable clamp, one equipment-grounding-conductor group, and one single-gang device. What is the maximum number of 12 AWG insulated circuit conductors (hots and neutrals) permitted?

• A4
• B5
• C7
• D9

An existing one-family dwelling service is being upgraded to 200 amperes, 120/240-volt, single-phase, and the service conductors will carry the entire dwelling load. Using 310.15(B)(7) and 75°C copper terminations, what is the smallest service conductor permitted from Table 310.15(B)(16)?

• A1 AWG copper (130 amperes)
• B1/0 AWG copper (150 amperes)
• C2/0 AWG copper (175 amperes)
• D3/0 AWG copper (200 amperes)

All conductors of an existing multiwire branch circuit, including the grounded conductor, must be grouped together in the same raceway, cable, or trench primarily to:

• AReduce voltage drop to zero
• BMinimize inductive heating and ensure overcurrent devices open under fault
• CAllow the neutral to be half the ungrounded size in all cases
• DEliminate the need for a disconnect

Type UF cable is permitted for which of the following on an existing structure?

• AInterior dry-location branch-circuit wiring where Type NM is permitted, and direct burial
• BService-entrance conductors on the supply side of the service disconnect in all cases
• CA substitute for Type AC cable in a patient-care vicinity
• DUse as a flexible cord to a portable appliance

Type SE cable installed as interior branch-circuit or feeder conductors in an existing building is generally subject to which ampacity limitation?

• AThe 90°C column of Table 310.15(B)(16) as the final ampacity
• BThe 60°C conductor temperature rating, following the Type NM installation rules of 334.80
• CNo ampacity limit if the cable is marked USE
• DTwice the 75°C ampacity

Which of the following is a standard ampere rating for fuses and inverse-time circuit breakers in NEC 240.6(A)?

• A22 amperes
• B45 amperes
• C55 amperes
• D85 amperes

The next-higher standard overcurrent-device rating above the conductor ampacity is permitted by 240.4(B) when all of the listed conditions are met and the overcurrent device is rated:

• A800 amperes or less
• B1,000 amperes or less
• C1,200 amperes or less
• DAny ampere rating

Ground-fault protection of equipment is required by 230.95 for a solidly grounded wye service of more than 150 volts to ground, not exceeding 1,000 volts phase-to-phase, when each service disconnect is rated:

• A400 amperes or more
• B600 amperes or more
• C800 amperes or more
• D1,000 amperes or more

After ambient correction and adjustment, a feeder conductor in an existing building has an ampacity of 47 amperes. The circuit is not a multioutlet receptacle branch circuit, and 240.4(D) does not apply. What is the largest standard inverse-time breaker permitted by 240.4(B)?

• A40 amperes
• B45 amperes
• C50 amperes
• D60 amperes

Under the 10-foot feeder tap rule of 240.21(B)(1), tap conductor ampacity shall not be less than the computed load, not less than the rating of the device or overcurrent device supplied, and not less than what percentage of the feeder overcurrent device?

• A10 percent
• B25 percent
• C33 percent
• D50 percent

A 400-ampere feeder in an existing electrical room supplies a 25-foot tap installed under 240.21(B)(2). What is the minimum tap-conductor ampacity, and what is the smallest 75°C copper conductor that meets that ampacity?

• A40 amperes — 8 AWG copper
• B100 amperes — 3 AWG copper
• C133 amperes — 1/0 AWG copper
• D200 amperes — 3/0 AWG copper

Overcurrent devices protecting an existing dwelling shall not be located in which of the following?

• AA dedicated electrical closet with working space
• BThe dwelling unit bathroom
• CA garage that is not a clothes closet
• DAn unfinished basement with 6½-foot headroom