Journeyman Electrician Practice Test 16

Question 1: Where the grounding electrode conductor is the sole connection to a ground ring, it is not required to be larger than:

• 6 AWG copper in every case
• 4 AWG copper in every case
• 3/0 AWG copper in every case
• The ring conductor size

NEC Reference: NEC 250.66(C)

Question 2: Which statement about grounding electrode conductor material is correct?

• Cu, Al or Cu-clad Al; solid or stranded; bare or insulated
• It must be stranded aluminum only
• It must be insulated copper only
• It must be bare solid copper only

NEC Reference: NEC 250.62

Question 3: Where may the grounded (neutral) conductor be used to ground non-current-carrying metal parts of equipment?

• On the load side of an SDS disconnect
• At every subpanel in the building
• At any receptacle outlet box
• On the supply side of, or in, the service disconnect

NEC Reference: NEC 250.142(A)

Question 4: In a multi-occupancy building, each unit's metal water piping is isolated from the others by plastic pipe. Unit A is fed by a 100 A feeder. How may Unit A's piping be bonded?

• Unit A panel ground bar, 8 AWG copper jumper
• Main service only, with a 4 AWG conductor
• It may be left completely unbonded
• To a ground rod driven outside Unit A

NEC Reference: NEC 250.104(A)(2)

Question 5: A motor is bolted, metal to metal, to a steel equipment rack. The rack is connected to an equipment grounding conductor. Which statement is correct?

• The building steel frame may serve as its EGC instead
• It needs its own separate EGC run back to the panel
• It must be connected to a separate driven ground rod
• It is considered connected to the EGC via the rack

NEC Reference: NEC 250.136

Question 6: A commercial kitchen has three cooking appliances rated 10 kW, 8 kW and 6 kW. What is the feeder demand load?

• 18.0 kW
• 19.2 kW
• 21.6 kW
• 24.0 kW

NEC Reference: NEC Table 220.56

Question 7: The calculated feeder neutral load (balanced, no nonlinear loads) is 320 A. What neutral load may be used for sizing after the 220.61(B)(2) demand factor?

• 224 A
• 284 A
• 296 A
• 320 A

NEC Reference: NEC 220.61(B)(2)

Question 8: A 120-volt appliance draws 12 A. What is its resistance and power?

• 1.44 Ω and 144 W
• 10 Ω and 1,200 W
• 12 Ω and 1,200 W
• 10 Ω and 1,440 W

Question 9: A floor receptacle in a dwelling living room counts toward the required wall receptacle spacing only if it is within what distance of the wall?

• 6 in.
• 12 in.
• 18 in.
• 24 in.

NEC Reference: NEC 210.52(A)(3)

Question 10: A small building has service conductors with an ampacity of 50 A. A feeder from the service carries the total load. What minimum ampacity must the feeder have?

• 30 A
• 40 A
• 50 A
• 60 A

NEC Reference: NEC 215.2(A)

Question 11: How many services may supply a building, in general?

• One, unless an exception in 230.2 applies
• Any number
• One per floor
• Two, one for lighting and one for power

NEC Reference: NEC 230.2

Question 12: A terminal will receive two conductors, or an aluminum conductor. What must be true of the terminal?

• Nothing special is required
• Tin-plated copper
• Rated 90 °C or higher
• Identified for that use

NEC Reference: NEC 110.14(A)

Question 13: Article 100 defines "ampacity" as the maximum current a conductor can carry continuously:

• Under conditions of use, within its temperature rating
• At 30 °C in free air only
• Until its overcurrent device trips
• For three hours or less at a time

NEC Reference: NEC Article 100

Question 14: A series circuit has R = 6 Ω, XL = 10 Ω and XC = 2 Ω. What is the total impedance?

• 8 Ω
• 10 Ω
• 14 Ω
• 18 Ω

Question 15: Which conductors of a circuit must be installed in the same raceway, cable tray or trench?

• Only the EGC; phases may be run separately
• Only the ungrounded (phase) conductors of the circuit
• Only the ungrounded and grounded conductors
• All of them, including the neutral and EGC

NEC Reference: NEC 300.3(B)

Question 16: Which is a permitted use of flexible cord?

• Connection of equipment that is interchanged frequently
• Attached to the building surface as fixed wiring
• Run through a hole in a wall to another room
• Concealed above a suspended ceiling

NEC Reference: NEC 400.10(A)

Question 17: In a building not exceeding three floors above grade, electrical nonmetallic tubing (ENT) may be installed:

• Only above air-handling ceilings
• Only when embedded in concrete
• Only in wet locations
• Exposed (if allowed) or concealed

NEC Reference: NEC 362.10

Question 18: Unless specifically permitted elsewhere, 16 AWG copper conductors may be protected at not more than:

• 7 A
• 10 A
• 15 A
• 20 A

NEC Reference: NEC 240.4(D)(2)

Question 19: May a circuit breaker marked 480Y/277 V be used on a 480-volt, 3-phase, corner-grounded delta system?

• No; 480 V to ground exceeds the 277 V rating
• Yes; slash ratings never restrict use
• Yes, provided it is a 3-pole breaker
• Yes, because the higher value is 480 V

NEC Reference: NEC 240.85

Question 20: The disconnecting means for a 25 hp motor that is a motor-circuit switch must be:

• Rated only in amperes
• A plug and receptacle
• Rated in horsepower
• A general-use snap switch

NEC Reference: NEC 430.109(A)(1)

Question 21: A motor with a service factor of 1.15 has a nameplate full-load current of 42 A. What is the maximum rating of the separate overload device?

• 46.2 A
• 48.3 A
• 52.5 A
• 58.8 A

NEC Reference: NEC 430.32(A)(1)

Question 22: To bond pool water, an intentional bond in contact with the water must have a conductive surface area of at least:

• 4 sq in.
• 9 sq in.
• 16 sq in.
• 36 sq in.

NEC Reference: NEC 680.26(C)

Question 23: Overcurrent devices supplying a fire pump must be sized to carry, indefinitely:

• 125% of the fire pump full-load current
• Locked-rotor current of the fire and jockey pumps, plus accessories
• Full-load current of the fire pump alone
• 250% of the fire pump full-load current

NEC Reference: NEC 695.4(B)

Question 24: A permanently installed feeder to a mobile home must consist of how many insulated, color-coded conductors?

• Two insulated conductors
• Three insulated conductors
• Four, including an EGC
• Five, including two EGCs

NEC Reference: NEC 550.33(A)

Question 25: A conduit run leaves a Class I, Division 1 location. Where must the boundary seal be located?

• Within 10 ft of the boundary
• Within 50 ft of the boundary
• Only at the boundary wall itself
• Within 18 in. of the first box

NEC Reference: NEC 501.15(A)(4)

Question 26: Branch-circuit conductors within 3 in. of a ballast or LED driver inside a luminaire must have an insulation temperature rating of at least:

• 60 °C
• 75 °C
• 90 °C
• 105 °C

NEC Reference: NEC 410.68

Question 27: A faceplate for a flush-mounted snap switch must:

• Be at least 1/8 in. thick
• Be omitted in dwelling units
• Be made of metal only
• Fully cover the opening and seat flush

NEC Reference: NEC 404.9(A)

Question 28: A 4 in. × 1½ in. octagon box (15.5 cu in.) has a luminaire stud, internal clamps and one or more 14 AWG equipment grounding conductors. How many 14 AWG circuit conductors may be added?

• 3
• 4
• 5
• 7

NEC Reference: NEC 314.16(A) and (B)

Question 29: Rigid PVC conduit is not permitted where the ambient temperature exceeds what value (unless listed otherwise)?

• 75 °C
• 60 °C
• 50 °C
• 40 °C

NEC Reference: NEC 352.12(D)

Question 30: A 225 kVA, 3-phase transformer has a 480-volt primary. Primary and secondary protection are both provided. What is the maximum standard primary overcurrent device rating?

• 400 A
• 600 A
• 700 A
• 800 A

NEC Reference: NEC Table 450.3(B)