Journeyman Electrician Practice Test 6

Question 1: A single ground rod is tested and shows a resistance to earth of 20 ohms. Is a supplemental electrode required?

• No; a single rod with 25 ohms or less need not be supplemented
• No, but the grounding electrode conductor must be increased to 4 AWG
• Yes; every rod electrode must always be supplemented by a second rod
• Yes, unless the rod is at least 10 ft long and driven fully into the soil

NEC Reference: NEC 250.53(A)(2)

Question 2: A grounding electrode conductor must be installed in one continuous length unless it is spliced by:

• A listed twist-on wire connector rated for the conductor size
• A split-bolt connector wrapped with two layers of rubber tape
• Any listed mechanical set-screw lug installed in a junction box
• Listed irreversible compression connectors, or exothermic welding

NEC Reference: NEC 250.64(C)

Question 3: Which method is NOT permitted for connecting an equipment grounding conductor to a metal enclosure?

• A sheet-metal screw
• Exothermic welding
• A machine screw-type fastener engaging at least two threads
• A listed pressure connector

NEC Reference: NEC 250.8(A)

Question 4: The connection of a grounding electrode conductor to a driven ground rod above grade must be:

• Covered with a junction box
• Encased in concrete
• Made with solder
• Accessible

NEC Reference: NEC 250.68(A)

Question 5: A service uses 350 kcmil aluminum service-entrance conductors. What is the minimum size copper grounding electrode conductor to the water pipe electrode?

• 2/0 AWG
• 1/0 AWG
• 2 AWG
• 4 AWG

NEC Reference: NEC Table 250.66

Question 6: A dwelling has one 12 kW electric range (demand 8 kW from Table 220.55). What range load may be used when calculating the service neutral?

• 4.0 kW
• 5.6 kW
• 8.0 kW
• 12.0 kW

NEC Reference: NEC 220.61(B)(1)

Question 7: A hospital has a calculated general lighting load of 80,000 VA in areas where the entire lighting is not likely to be used at one time. What is the feeder demand load?

• 26,000 VA
• 32,000 VA
• 40,000 VA
• 80,000 VA

NEC Reference: NEC Table 220.45

Question 8: A 1,500 W microwave and a 1,000 W coffee maker are operated at the same time on one 120-volt, 20-ampere circuit. What is the total current?

• 12.5 A
• 16.0 A
• 20.8 A
• 25.0 A

Question 9: In a dwelling, a stairway between two floor levels has eight risers. What lighting control is required?

• No switch, a plug-in lamp is acceptable
• A motion sensor at the top only
• A single switch at the bottom of the stairs
• A listed wall-mounted control device at each floor level and landing level that includes an entryway

NEC Reference: NEC 210.70(A)(2)

Question 10: The point of attachment of overhead service-drop conductors to a building must be at least how high above finished grade?

• 8 ft
• 10 ft
• 12 ft
• 15 ft

NEC Reference: NEC 230.26

Question 11: On a 20-ampere branch circuit, what is the maximum rating of any one piece of cord-and-plug-connected utilization equipment not fastened in place?

• 10 A
• 15 A
• 16 A
• 20 A

NEC Reference: NEC 210.23(A)(1)

Question 12: Article 100 defines a "dwelling unit" as a single unit providing complete and independent living facilities with permanent provisions for:

• Living, sleeping, cooking and sanitation
• Heating and air-conditioning
• Sleeping and parking
• Cooking and laundry only

NEC Reference: NEC Article 100

Question 13: Where the NEC requires a disconnecting means to be lockable in the open position, the locking provision must:

• Be keyed alike with every other disconnect in the building
• Be a portable lock-out device that is stored near the disconnect
• Be removable by the installer after the final inspection
• Remain in place with or without the lock installed

NEC Reference: NEC 110.25

Question 14: Each disconnecting means must be legibly marked to indicate its purpose unless:

• It is located and arranged so the purpose is evident
• It is a circuit breaker installed in a listed panelboard
• It is installed anywhere within a dwelling unit
• It is rated less than 30 A and supplies only one outlet

NEC Reference: NEC 110.22(A)

Question 15: Six current-carrying 12 AWG THHN copper conductors are run in one raceway through an attic where the ambient temperature is 50 °C. What is the adjusted ampacity of each conductor?

• 15.0 A
• 19.7 A
• 24.0 A
• 24.6 A

NEC Reference: NEC 310.15(B)(1)(1) and 310.15(C)(1)

Question 16: Interlocked-armor Type MC cable must be bent so the radius of the curve of the inner edge is at least how many times the external diameter of the cable?

• 12 times
• 10 times
• 7 times
• 5 times

NEC Reference: NEC 330.24(B)

Question 17: In an unfinished basement, a 12/2 NM cable runs at an angle across the floor joists. How must it be installed?

• Through bored holes in the joists or on running boards
• Draped loosely across the joists
• In PVC conduit only
• Stapled directly to the bottom edges of the joists

NEC Reference: NEC 334.15(C)

Question 18: Overcurrent devices must NOT be located:

• In a garage
• On an outside wall
• In a basement
• Over the steps of a stairway

NEC Reference: NEC 240.24(F)

Question 19: Type S plug fuses are classified at not over 125 volts and in which ampere ranges?

• 0–10, 11–20 and 21–30 A
• 0–15, 16–20 and 21–30 A
• 0–20, 21–30 and 31–60 A
• 0–15, 16–30 and 31–40 A

NEC Reference: NEC 240.53(A)

Question 20: A 20-ampere, general-use AC snap switch is used as the disconnecting means for a 1 hp, 120-volt motor. What is the maximum full-load current rating of the motor?

• 25 A
• 20 A
• 16 A
• 10 A

NEC Reference: NEC 430.109(C)(2)

Question 21: A hermetic refrigerant motor-compressor has a rated-load current of 20 A (the branch-circuit selection current is not marked). What is the maximum rating of the branch-circuit short-circuit and ground-fault protective device, before any increase for starting?

• 25 A
• 35 A
• 45 A
• 50 A

NEC Reference: NEC 440.22(A)

Question 22: 125-volt, single-phase receptacles rated 30 A or less, located within what distance (measured horizontally) of the inside walls of a hydromassage bathtub, must be GFCI protected?

• 3 ft
• 5 ft
• 6 ft
• 10 ft

NEC Reference: NEC 680.71

Question 23: Wiring from an emergency source to emergency loads must generally be:

• Run in the same raceways as the normal power wiring to save space
• Protected by GFCI devices on every emergency branch circuit
• Installed only in Schedule 80 PVC conduit throughout the building
• Kept entirely independent of all other wiring and equipment

NEC Reference: NEC 700.10(B)

Question 24: Article 518 (Assembly Occupancies) applies to buildings or portions designed or intended for the gathering of how many persons or more?

• 50
• 100
• 200
• 300

NEC Reference: NEC 518.1

Question 25: In a Class I location, how must metal raceways be bonded where they enter enclosures?

• Locknut-bushing and double-locknut contacts may not be relied on; bonding jumpers with proper fittings or other approved means must be used
• Bonding is not required if the conduit is threaded
• Double locknuts are sufficient
• A single locknut is sufficient

NEC Reference: NEC 501.30(A)

Question 26: A luminaire may not be supported by the screw shell of a lampholder if it weighs more than 6 lb or exceeds what dimension in any direction?

• 24 in.
• 18 in.
• 16 in.
• 12 in.

NEC Reference: NEC 410.30(A)

Question 27: Snap switches, including dimmers, must be connected to:

• A grounding electrode
• The grounded conductor
• A separate isolated ground
• An equipment grounding conductor

NEC Reference: NEC 404.9(B)

Question 28: An outlet box is installed in a noncombustible wall (such as tile over cement board). How far may the front edge of the box be set back from the finished surface?

• Not at all, it must be flush
• Not more than 3/4 in.
• Not more than 1/4 in.
• Not more than 1/2 in.

NEC Reference: NEC 314.20

Question 29: How many 8 AWG THHN copper conductors may be installed in 1 in. EMT? (40% area of 1 in. EMT = 0.346 sq in.; one 8 AWG THHN = 0.0366 sq in.)

• 6
• 9
• 12
• 16

NEC Reference: NEC Chapter 9, Table 1, Table 4 and Table 5

Question 30: An indoor dry-type transformer rated more than 112.5 kVA (with insulation rated below Class 155) must be installed:

• In a transformer room of fire-resistant construction rated at least 1 hour
• In a vault with a 3-hour fire rating and a sill at the doorway
• Only outdoors, in a raintight enclosure on a concrete pad
• Anywhere indoors, as long as it is 12 in. from combustible material

NEC Reference: NEC 450.21(B)