Electrical quiz - GBT

Which of the following is true when using the American Wire Gage (AWG)? a. The smaller the number the smaller the wire. b. The larger the wire the larger the number. c. The smaller the number the larger the wire. d. All conductors are shown in circular mill size.

The smaller the number the larger the wire.

Three conductors pass unbroken through a box. In addition, on hot conductor is spliced to a conductor going to a switch (switch leg). A neutral is spliced to a fixture wire and carries on through the fixture stud and a fixture hickey installed in the box. All conductors are No. 12 in metal raceways with conductors in the box for the purposes of determining box fill. a. 7 b. 9 c. 10 d. 12

12

Direct buried conductores emerging from grade shall be protected by enclosures in no case deeper than ______ to a point at least _______ above grade. a. 6 inches/10 feet b. 12 inches/20 feet c. 18 inches/8 feet d. 24 inches/12 feet

18 inches / 8 feet

Individual conductors in a cable bus shall be supported ______ feet for horizontal runs and ______ feet for vertical runs. a. 3 / 1.5 b. 4.5 / 6 c. 10 / 10 d. 12 / 6

3 feet /1.5 feet

What length of flexible metal conduit is allowed to connect physically adjustable equipment and devices permitted to be used in ducts and plenum chambers? a. 2-feet b. 4-feet c. 6-feet d. 10-feet

4-feet

A 3/8-inch flexible metal conduit with fitting outside the conduit has 14-AWG THHN wire installed for the installation of luminaries. What is the maximum number of wires permitted, including any installed equipment grounding conductors, in this conduit? a. 2 b. 3 c. 4 d. 5

5

For the purposes of determining box fill, use Figure 9, to calculate the number of conductors in the junction box. a. 6 b. 7 c. 8 d. 9

9

Arc-Fault circuit breakers shall be installed on the branch circuit conductors and outlets located in dwelling unit ______. a. Kitchens b. Bedrooms c. Outdoors d. Garage and storage rooms

Bedrooms

Where more than one nominal voltage system supplies branch-circuits each grounded and ungrounded conductor shall be identified by system and the means of identification shall be posted at: a. service entrance b. transformer disconnecting means and main distribution panel c. each system branch-circuit panel board or distribution equipment d. each branch circuit device fed from the system panel board

each system branch-circuit panel board or distribution equipment

All conductors installed in tunnel installations shall be cabled, _____, or arranged in an approved manner that provides ready and safe access for persons to enter for installation and maintenance. a. protected b. racked up c. supported d. in raceways

racked-up

At what voltage does RMC require the installation of double locknuts to ensure electrical continuity? a. 120 volts and above b. 250 volts and above c. 600 volts and above d. Double locknuts are always required

250 volts and above

The NEC recommends that voltage drop be limited to ____ percent on heating and appliance branch-circuits to provide reasonable efficiency of operation. a. 2 b. 3 c. 4 d. 5

3

The neutral feeder demand for household electric ranges is permitted to be _____ percent of the feeder demand for the ungrounded conductors a. 125 b. 80 c. 75 d. 70

70

Given: A one-family dwelling as follows: -Size 1,050 square feet of living space Service: 120/240 volt single phase service -Cooling: One 1/3 HP 120V cooler motor (air conditioner only) -Heating: One 1/6 HP 120V furnace blower motor (heating only() -Laundry: One clothes washer -One 5kW 240 V clothes dryer -Kitchen: One 9.5 Kw range -One 1.9 kVA 120 V dishwasher (1/3 HP motor) -One 9 amp 120V disposal Do NOT use the "OPTIONAL" method. Each ungrounded conductor in the service for the single-family dwelling has a MINIMUM net computed load of _____. a. 89 amps b. 91 amps c. 95 amps d. 100 amps

91 amps

Cable splices made and insulated by approved methods shall be permitted to be located within a cable tray, provided they ______. a. are located outside b. bare made with listed materials and are sunlight resistant c. are accessible and project above the side rails where not subject to physical damage

Are accessible and project above the side rails where not subject to physical damage.

Which of the following devices are required to be protected by an Arc-fault circuit breaker in a dwelling unit wiring application? a. 240-V wall mounted receptacle used for air conditioning b. Telephone outlet c. Cable T.V. outlet d. Wall mounted luminaries in a bedroom

Wall mounted luminaries in a bedroom

All circuit conductors between the service equipment, the source of a separately derived system, or other power supply source and the final branch-circuit over current device are considered as _____ conductors. a. branch-circuit b. feeder c. overcurrent devices d. service

feeder

The voltage rating of equipment shall not be ____ the nominal voltage of a circuit to which it is connected. a. more than b. less than c. the same as d. equal to

less than

A building sign is connected with 8 - 6 AWG cooper THHN conductors. The equipment grounding conductor is included in the conductor count. What is the MINIMUM size Schedule 40 PVC conduct required for this installation? a. 1 inch b. 1-1/4 inch c. 1-1/2 inch d. 2 inch

1-1/4 inch

What is the service demand load for a 20.8 kW range? a. 9 kW b. 11.6 kW c. 20.8 kW d. 21 kW

11.6 kW

The installation in Figure 11 consists of three No.4/0 copper conductors installed in a 2"EMT passing through the pull box at right angles. What is the MINIMUM diagonal distance "A" on drawing in Figure 11? a. 10 inches b. 12 inches c. 14 inches d. 16 inches

12 inches

What is the bending radius for a 3-inch IMC raceway, using a one shot bender? a. 10 inches b. 13 inches c. 15 inches d. 24 inches

13 inches

Bends of IMC shall be made so that the conduit will not be damaged and so that the internal diameter of the conduit will not be effectively reduced. What is the MINIMUM bending radius using a One Shot Bender for a 3-1/2 inch conduit? a. 24 inches b. 32 inches c. 48 inches d. 15 inches

15 inches

Calculate dimension "A" in the drawing labeled "Figure 8". a. 16 b. 18 c. 22 d. 30

16

When a wall-mounted oven is tapped from a 50 ampere branch circuit, the ampacity of the tap conductors shall not be less than _____ amps. a. 15 b. 20 c. 30 d. 40

20

Calculate dimension "A" in the drawing labeled "Figure 4". a. 20-inches b. 15-inches c. 22-inches d. 24-inches

20-inches

What is the MAXIMUM rating of the secondary circuits supplying an isolating power supply operating at 30-volts or less under any load conditions? a. 15 amperes b. 20 amperes c. 25 amperes d. 30 amperes

25 amperes

What is the MINIMUM workspace required for two panels shown in the figure? a. 3-feet b. 3-feet, 6 inches c. 4-feet d. 4-feet, 6 inches

3-feet

What is the minimum clearance for service conductors installed as open conductors from a porch? a. 3-feet b. 5-feet c. 6-feet d. 8-feet

3-feet

Generally, the voltage between conductors for surface mounted raceway not listed for higher voltage shall not be more than _____ between conductors. a. 150 V b. 250 V c. 300 V d. 480 V

300 V

Using the National Electrical Code, how many degrees of bending is allowed between pull-points in a metal conduit run? a. 18.00º b. 36.00º c. 180º d. 360º

360º

What is the MINIMUM size metal junction box required for 4-10 AWG conductors and 2-6 AWG conductors? a. 4 x 1-1/4 square box b. 4 x 2 square box c. 4 x 1-1/4 octagon box d. 4 x 2 octagon

4 x 1-1/4 octagon box

The MINIMUM branch circuit rating for a range rated 8-3/4 kW shall not be less than _____ amps. a. 25 b. 30 c. 40 d. 50

40

Threaded entries into explosion proof equipment shall be made up with at least ____ threads fully engaged. a. 7 b. 5 c. 4 d. 3

5

What is the MAXIMUM radius of the curve of the inner edge of any bend used for Type AC cable? a. 3 times the diameter b. 5 times the diameter c. 7 times the diameter d. 12 times the diameter

5 times the diameter

Which of the following is NOT a standard size electrical raceway or conduit? a. 4-inch b. 34 mm c. 154.8 mm d. 5-1/2 inch

5-1/2 inch

Receptacles supplying laundry, utility, and wet bar sinks shall be GFCI protected where the receptacles are installed within _____ of the outside edge of the sink a. 3-feet b. 4-feet c. 5-feet d. 6-feet

6-feet

Dry-type transformers installed indoors and rated 112 1/2 kVA shall have a separation of at least ____ from combustible material unless separated from the combustible material by a fire-resistant, heat insulated barrier. a. 6-inches b. 1-foot c. 18-inches d. Construction having a minimum fire rating of 1 hour

6-inches

What is the MAXIMUM conductor voltage level allowed for FMC? a. 300 V b. 600 V c. 1,000 V d. may be used for any voltage level

600 V

What is the minimum width of the working space in front of an electrical motor control center rated at 480-V with no live or grounded parts in front of the panel. The panel measures 78-inches wide. a. 3-ft b. 3-ft. 6-inches c. 48-inches d. 78-inches

78-inches

What is the feeder demand for one 10 kW range installed in a dwelling unit? a. 8 kW b. 8.6 kW c. 10 kW d. 12 kW

8 kW

What is the feeder demand for a 16 kW range in a dwelling unit? a. 9.6 kW b. 10.8 kW c. 12 kW d. 16 kW

9.6 kW

What is the minimum required headroom of the working space of a switchgear that measures 96-inches high? a. 96 inches b. 6 ft. 6 inches c. 78 inches d. 8 ft. 6 inches

96-inches

Which of the following describes the meaning of "Ampacity of a conductor"? a. The voltage a conductor can carry within its factory or manufacture recommendations. b. The current a conductor can carry within its factory or manufacture recommendations. c. The current a conductor insulation can carry for 3-hours or more without serious degradation of the conductor insulation. d. The current a conductor can carry continuously under the conditions of use without exceeding its temperature rating.

The current a conductor can carry within its factory or manufacture recommendations.

Which of the following is NOT a device? a. Dwelling unit door bell pushbutton b. Security alarm system door contact c. Fire alarm manual pull station d. loud speaker

loud speaker

Electrical equipment rooms or enclosures housing electrical apparatus that are controlled by a lock(s)shall be considered accessible to ______. a. authorized persons b. maintenance personnel c. occupants d. qualified persons

qualified persons

Type MC cable is permitted to be installed in which of the following conditions: a. In a metal raceway b. Where subject to physical damage c. Direct burial in the earth d. In concrete

In a metal raceway

What is the MINIMUM separation distance from combustible material for a 100 kVA dry-type transformer installed indoors unless separated from the combustible material by a fire-resistant, heat resistant barrier? a. 1-ft b. 2-ft c. 3-ft d. 4-ft

1-ft

The walls and roofs of vaults shall be constructed of materials that have adequate structural strength for the conditions with a minimum fire resistance of ______. a. 1 hour b. 2 hours c. 3 hours d. 4 hours

1-hour

In a completed seal, the minimum thickness of the sealing compound shall not be less than _____ for an installation of 1/2-inch conduit a. 1/2 inches b. 5/8 inches c. 3/4 inches d. 1 inch

5/8-inches

Which of the following would qualify for guarding live parts measured at 12,470 Volts? a. A 6-foot chain link fence with chain locked entry gates. b. A 6-foot chain link fence with 12-inches of barbed wire. c. A 5-foot chain link fence with 18-inches of razor wire and chain locked entry gates. d. This voltage does not require any additional protection at ground level.

A 6-foot chain link fence with 12-inches of barbed wire.

What is the purpose of the NEC? a. An installation that is essentially free from hazard but not necessarily efficient, convenient, or adequate b. Prevent fire propagation from cable installations used in both low voltage and high voltage electrical systems. c. Practical safeguarding of persons and property from hazards arising from the use of electricity. d. Specifications and safe wiring practices for electrical installers

Practical safeguarding of persons and property from hazards arising from the use of electricity

The calculated load of a feeder or service shall not be less than: a. Total building demand load b. Sum of all loads on the branch circuits c. Total of the small appliance, laundry, and general lighting load d. Total nameplate ampere rating of equipment

Sum of all loads on the branch circuits

An EMT raceway runs across and earth quake expansion joint section in a building. The raceway is required to: a. be supported every 5-ft with approved fastening devices. b. an equipment grounding conductor must be installed in the raceway c. Flexible metal conduit must be used around the expansion joint d. The raceway must be made electrically continuous be equipment bonding jumpers

The raceway must be made electrically continuous by equipment bonding jumpers.

Surface nonmetallic raceways shall not be used _____. a. Where concealed b. Where subject to physical damage c. Where the voltage is 300 volts or more between conductors, unless listed for a higher voltage in hoistways d. all of the above

all of the above

What is the MINIMUM fire-resistant construction rating of the room housing a 300kVA transformer dry-type transformer installed indoors? a. 1/2 hour b. current capacity c. OCPD protection d. ungrounded systems

1-hour

Equipment rated at _____ or more that contain over current devices shall have entry personnel door(s) that open in the direction of egress. a. 600 amperes b. 1k amperes c.1.2 k amperes d. 1.5k amperes

1.2k amperes

In damp or wet locations, surface-type enclosures within the scope of this article shall be placed or equipped so as to prevent moisture or water from entering and accumulating within the cabinet or cutout box, and shall be mounted so there is at least ____ airspace between the enclosure and the wall or other supporting surface. a. 1/4-inch b. 1/2-inch c. 1-inch d. 1-1/2 inch

1/4-inch

In walls of concrete, tile, or other noncombustible material, cabinets shall be installed so that the front edge of the cabinet is not set back of the finished surface more than 6 mm (1/4 in.). In walls constructed of wood or other combustible material, cabinets shall be flush with the finished surface or project _____there from. a. 1/4-inch b. 1/2 inch c. 1-inch d. 1-1/2 inch

1/4-inch

The smallest conductor permitted for a household wall-mounted oven, electric range, or cooking unit is _____ AWG. a. 12 b. 10 c. 8 d. 6

10

Doors and covers of enclosures used on systems rated of 600V, used solely as pull boxes, splice boxes, or junction boxes shall be locked, bolted, or screwed on. Underground box covers that weigh over _____ shall be considered as meeting this requirement. a. 30 lbs b. 75 lbs c. 100 lbs d. 200 lbs

100 lbs

A door sill or curb of a transformer vault shall be of sufficient height to confine the oil from the largest transformer within the vault shall be provided, and in no case shall the height be less than ____. a. 4-inches b. 6-inches c. 10-inches d. 12-inches

4-inches

A conduit nipple between a Power Panelboard and a sideway is 36-inches long and contains 4-3/0 THHN conductors and 1-#2 AWG wire. The maximum total cross-sectional area conductor fill capacity for this raceway is: a. 53% b. 31% c. 40% d. 60%

40%

A show window measured opening is 25 feet. What is the feeder load calculation for the show-window lighting? a. 15kVA b. 5kVA c. 75kVA d. 1.875kVA

5kVA

As listed in Table 310.13, paper insulation shall be permitted to be used as insulation for underground service conductors, or by special permission. As used on this table, special permission means? a. written consent of the engineer or architect b. acceptable to the authority have jurisdiction c. acceptable to the owner, architect, and electrical contractor. d. written consent of the authority having jurisdiction.

Acceptable to the authority have jurisdiction.

An emergency light is installed at the exit of an industrial building. Which of the following is an expectable wiring procedure for connecting the supply conductors? a. EM light must be permanently installed and connected with any wiring method allowed in Chapter 3 of the National Electrical Code. b. EM light must be permanently installed and is permitted to be installed with flexible cord-and-plug connection provided the cord is not longer than three feet in length. c. EM light must be permanently installed and connected to the lighting circuit in the area ahead of any switching devices. d. All of the above.

All of the above.

In a dwelling unit, which of the following installations is NOT required to have GFCI protection on a 120 volt 20 ampere receptacle? a. A general use receptacle located 18-inches above the floor within 6-feet of a laundry sink. b. A switched receptacle installed for a kitchen waist disposer located under a wet bar sink. c. A single receptacle located in a garage designed to power a freezer that is 3-feet from a utility sink. d. All of these require GFCI protection.

All of these require GFCI protection.

Arc-fault protection is required on branch circuits that supply power to outlets in which of the following locations: a. Bedrooms and bedroom closets, including smoke detectors b. Bedrooms, living rooms, family rooms, and basements c. Bedrooms, master bathrooms, and bedroom closets d. Ever branch-circuit in a residence is required to have AFCI protection

Bedrooms and bedroom closets, including smoke detectors

All 15- and 20-ampere, 125-volt receptacles installed outdoors in a wet location at grade level for a commercial building a. are required to be GFCI protected b. shall have an enclosure that is weatherproof whether or not the attachment plug cap is inserted. c. shall have an enclosure for the receptacle that is weatherproof when the receptacle is covered (attachment plug cap not inserted and receptacle covers closed). d. Both a & b

Both a & b

Where more than one branch circuit supplies more than one receptacle on the same yoke, a means to simultaneously disconnect the ungrounded conductors supplying those receptacles shall be provided at the panel board where the branch circuits originated. This may be accomplished by ______. a. Two single pole circuit breakers with an approved handle tie. b. One two-pole circuit breaker c. a fused disconnect. d. Both a & b

Both a & b

Each multi wire branch circuit shall be provided with a means that will ______ all ungrounded conductors at the point where the branch circuit originates. a. disconnect each branch-circuit conductor. b.disconnected all conductors including the grounded conductor. c. simultaneously disconnect each ungrounded conductor. d. Both b & c

Both b & c

A load where the maximum current is expected to continue for 3-hours or more is a: a. Grounded load b. Continuous load c. Connected load d. Derated connected load

Continuous load

Above ground installations for circuit voltage of 600 volts, which of the following raceway systems are NOT allowed? a. EMT b. IMC c. RMC d. LTFMC

LTFMC

The Transist Authority is installing a washing station for buses at the bus garage. All exposed boxes, fitting, conduits, and cable inside the wash station shall be installed ____. a. So that devices can be easily removed for cleaning b. So there is a 1/4 inch airspace between it and the wall c. Using plastic wiring methods or non-corrosive materials d. So that all wiring methods are flush with all exposed surfaces.

So there is a 1/4 inch airspace between it and the wall

Wiring Methods consist of single conductors for solar photovoltaic systems shall be permitted to be installed in the same manner as _____. a. THHN multiconductor cable b. Type UF multiconductor cable c. Cable tray installations d. Flexible cord installations

Type UF multiconductor cable

Which of the following is NOT considered a health care facility? a. Dentist office b. Nursing home c. Hospital d. Veterinarian office

Veterinarian office

Buildings that contain branch circuits supplied from more than one nominal voltage system, each ungrounded conductor of a branch circuit shall be identified by phase or line and system at all ______. The means of identification shall be permitted to be by separate color coding, marking tape, tagging, or other approved means. a. termination b. connection c. splice points d. all of the above

all of the above

The current that a conductor can carry continuously under the conditions of use without exceeding its temperature rating best defines______. a. ampacity b. current capacity c. OCPD protection d. ungrounded systems

ampacity

Wiring systems inside boxes must be installed so that conductors contained anthem can ____without removing any part of the building. a. access devices b. be rendered accessible c. sliced and connected to devices d. have extra space for future expansion

be rendered accessible

What is the MAXIMUM radius of the curve of the inner edge of any bend used for a 1-1/2 Type MC corrugated sheath cable? a. 3 times the diameter b. 5 times the diameter c. 7 times the diameter d. 12 times the diameter

c. 7 times the diameter

GFCI protection is required for all receptacles in the following locations except _______. a. dining room receptacles b. garage door opener receptacles c. vending machines d. industrial bathrooms

dining room receptacles

An electrical supply point from which service drops, service laterals, feeders, or branch circuits to agricultural buildings, associated farm dwellings, and associated buildings under single management is defined as: a. service point b. service entrance c. feeder connection point d. distribution point

distribution point

A laundry sink is installed in a counter top in a swelling unit laundry room. A receptacle outlet is installed within 6-feet of the sink that serves the counter top. The receptacle is: a. required by code to be GFCI protected. b. required by code to be AFCI protected. c. required by code to be listed for a wet location. d. allowed to be installed using general wiring methods without GFCI protection.

required by code to be GFCI protected.