Code

Cartridge fuses and fuseholders shall be classified according to voltage and ampere ranges. Fuses rated ______ volts nominal, or less shall be permitted to be used for voltages at or below their ratings.

1,000 240.61

What is the MAXIMUM conductor voltage level allowed for FMC in above ground installations?

1,000 V 300.37

A building sign is connected with 8-6 AWG copper 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?

1-1/4 inch AMNEX table- C-10

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

1-foot 450. 21(A)

What is the MINIMUM separation distance from combustible material from a 100kVA dry-type transformer installed indoors unless separated from the combustible material by a fire resistant, heat resistant barrier?

1-ft 450. 21(A)

What is the MINIMUM fire-resistant construction rating of the room housing a 300kVA dry-take transformer installed indoors?

1-hour 450. 21(B)

In damp or wet locations, surface-type enclosures shall be placed or equipped 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.

1/4- inch 300.21

In walls of concrete, tile, or other noncombustible material, cabinets, cutout boxes, or meter socket enclosures shall be installed so that the front edge of the cabinet is not set back of the finishes surface more than _____. In walls constructed of wood or other combustible material, cabinets shall be flush with the finished surface or project there from.

1/4-Inch 312.3

Doors and covers of enclosures used on systems rated over 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.

100 pounds 110.31 (D)

What is the service demand load for a 20.8 kW range?

11.6kW

Three conductors pass unbroken through a box. In addition, one 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 box. A switch leg is spliced to a fixture wire. The two fixture wires supply a lighting fixture. There is a fixture stud and a fixture hickey installed in the box. All conductors are No. 12 in metal raceways with metal boxes. There are no cable clamps contained within the box. Calculate the number of the conductors in the box for the purposes of determining boxfill.

12 314.16 (B)

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?

12 inches 314.28(A)(2)

What is the bending radius for a 3-inch IMC raceway, using a one-shot bender?

13 inches Table 2, chapter 9

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?

15 inches 342.24 Table 2 chapt. 9

Calculate dimension "A" in the drawing labeled "figure 4".

15-inches 314.28 (A) (2) 6xlargest 6x2in+2in+1in=15

What is the maximum continuous load, in kW, that may be supplied by a 480 volt, three-phase, 150 ampere branch circuit?

155.7 kW 210.19 (A) 480v x 150A x 1.73 x 1.25 = 155,700 /loo=155.7kW

Calculate dimension "A" in the drawing labeled "figure 8"

16 3.14.28 (A)(2)

Direct bured conductors emerging from grade shall be protected by enclosures in no case deeper than _________ to a point at lease _____ above grade.

18 inches/8feet 300.5 (D)(1)

A single-phase, 120/240 volt, 200-amere feeder is protected by a 200-ampere braker not listed for continuous operation at 100% of its rating. It already supplies a 80-ampere, 240-volt continuous lighting load. What is the maximum permitted amount of continuous load which may be added to the feeder.

19,200 watts 215.3 200-AX0.8= 160A-80A 80A X 240V - 19,200W.

The minimum number of outdoor receptacle outlets required for a single-family dwelling is _____ receptacles, one located on the front of the dwelling and one located on the back of the dwelling.

2 21-.52 (E)(1)

What is the ampacity of an aluminum copper busbar measuring 5-inches wide, and 5/8-inch thick contained in sheet metallic auxiliary gutter?

2,188 366.23 5in x 5/8 in x 700 = 2,188A

What is the ampacity of a copper busbar measuring 3-inches wide, and 3/4-inch thick contained in sheet metallic auxiliary gutter?

2,250 366.23 3in x 3/4in x 1000 = 2,250

What is the MINIMUM standard size solid bottom cable tray needed for two (2), 3-conductor, 1/0 AWG cables, three (3), 3-conductor, 2 AWG cables, and six (6) 9-conductor, 3 AWG control cables? (O.D. 1/0-AWG = 1.52 in.; O.D. 2-AWG = 1.14in.; O.D. 3 AWG conductor control cable = 1.625 in.)

24 in cable tray 392.22 (A)(3)(B)

What is the MAXIMUM rating of the secondary circuits supplying an isolating power supply for low-voltage lighting systems operating at 30-volts or less under any load conditions?

25- amperes 411.3

At what voltage does RMC require the installation of double locknuts to ensure electrical continuity?

250 volts and above 250.97 Ex. (2)

The NEC recommends that voltage drop be limited to ___ percent on heating and appliance branch-circuits to provide reasonable efficiency of operation.

3 210.19 (A) I.N. No. 4

The walls and roofs of electrical vaults over 600 volts shall be constructed of materials that have adequate structural strength for the conditions, with a minimum fire resistance of ___.

3 hours 110. 31 (A) (1)

What is the minimum clearance for service conductors installed as open conductors form a porch?

3-feet 230.9(A)

Individual conductors in a cable bus shall be supported ______ feet for horizontal runs and ____ feet for vertical runs.

3/1.5 370.30 (B)

Generally, the voltage between conductors for surface mounted raceway not listed for higher voltage shall not be more than _____ between conductors.

300V 388.12 (3)

Using the National Electrical Code, how many degrees of bending allowed between pull-points in a metal conduit run?

360 degrees 342.26

Determine the minimum size standard square metal box needed for an installation in which two 12 AWG THHN copper conductors connected to a single pole toggle switch, two 14 AWG THHN copper conductors connected to a single pole toggle switch?

4 in. x 1-1/12 in. Square box w/two gang plaster ring 314.16(B)

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 ______.

4 inches 450. 43(B)

What is the MINIMUM size metal junction box required for 4-10 AWG conductors and 2-6AWG conductors?

4 x 2-1/8 square box 314.16(A) (4x2.50) + (2x5.00) = 20 C U

What length of flexible metal conduit is allowed to connect physically adjustable equipment and devices permitted to be used in ducts and plenum chambers?

4-feet 300.22 (B)

What is the MINIMUM workspace required for two panels shown in the figure?

4-feet T-110.26 (A) (1), condition 3- Live parts on both sides, 4-foot clearance

A conduit nipple between a panelboard and a wireway in 36-inches long and contains 4-3/0 THHN conductors and 1-#2AWG wire. The maximum total cross-sectional area conductor fill capacity for this raceway is:

40% Table 1, Ch. 9

What is the ampacity of a 600 kcmil THHN copper conductor, when used with equipment rated 75 dfegrees.

420 A 310.15 (B)(16) 75 degree column

Threaded entries into explosion proof equipment shall be made up with atleast _______ threads fully engaged.

5 500. 8(E)(1)

A 3/8inch flexible metal conduit with fittings 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?

5 Table 348.22 *-note

What is the MAXIMUM radius of the curve of the inner edge of any bend used for Type AC cable?

5 times the diameter 320.24

Which of the following is NOT a standard size electrical raceway or conduit?

5-1/2 inch table 4, chapter 9

How many 3/conductor, 4 AWG cables can be installed in the same 12-inch solid bottom calbe tray with two (2), 4/conductor, 500 kcmil cables? (O.D. 4/conductor, 500kcmil = 3.12 in., O.D. 3/conductor, 4-AWG = 1.07 in.)

5-3/conductor cables 392.22 (A)(3)(C)

In a completed seal, the minimum thickness of the sealing compound shall not be less than _____ for an installation of 1/2-inch conduit.

5/8-inchs 501. 15 (C)(3)

Given: IN an uncovered ladder cable tray two, 4-conductor cables, 500 kcmil copper, spaced in a single-layer, are installed next to five, 3-conductor, 4 AWG copper, stacked on each other. All conductors in each cable are 75 degrees C rated insulated. What is the ampacity of EACH conductorr in the multiconductor cables?

500 kcmil = 304 amperes / 4 AWG = 85 amperes 310.15(B)(16) 380Ax.8=304A.

A show window measured opening is 25 feet. What is the feeder load calculation for the show-window lighting?

5kVA 200VA/lin ft.x25=5k 220.43(A)

A fence shall not be less than 7ft in height or a combination of _____ or more of fence fabric and 1ft or more extension utilizing three or more strands of barbed wire or equivalent.

6 ft 110.31

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.

6-feet 210.8 (A)(7)

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?

7 times the diameter 330.24 (B)

The maximum weight of a ceiling suspended paddle fan, in pounds, which a listed paddle fan outlet box is permitted to be used as the sole support for the fan is ______ Ibs.

70 314.27 (C)

What is the ampacity of a single 500kcmil THHN copper conductor installed in an uncovered ventilated cable tray when each conductor is separated by at least one cable diameter?

700 392.80 (A)(2)(C)

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.

78-inches 110.26 (A)(2)

What is the maximum width of a ventilated trough cable tray needed for three (3) 250 kcmil, THWN, copper single conductors; six (6) 500 kcmil, THWN , copper single conductors, and three (3) 750 kcmil, XHHW, compact aluminum single conductors? all have 600 colt insulation.

8.2341 in2 392.22 (B)(1)(B)

Equipment rated at ___ or more that contain overcurrent devices, switching devices, or control devices is installed and there is a personnel door intended for entrance to and egress from the working space less than 25-feet from the nearest edge of the working space, the door shall open in the direction of egress and be equipped with listed panic hardware.

800 amperes 110.26 (C)(3)

For the purposes of determining box fill, use figure 9, to calculate the number of conductors in the junction box.

9 314.16

Given: a one-family dwelling as follows: size:1,050 square feet of living space. Service 12/240 volt single-phase service. Cooling: one 1/3HP 120V cooler motor (air conditioner only) Heating: one 1/6HP 120V furnace blower moter (heating only) Laundry: one clothes washer One 5kW 240V clothes dryer Kitchen: one 9.5 kW range One 1.9 kVA 120V 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 ________.

91 amps section 220- Gener lighting lod

What is the minimum required headroom of the working space of a switchgrear that measures 96-inches high?

96-inches 110.26 (A)(3)

In a dwelling unit, which of the following installations is NOT required to have GFCI protection on a 120 volt 20 ampere receptacle?

All required GFCI protection 210.8 (A)(7)

Arc-Fault circuit breakers shall be installed on which of the following branch circuit conductors and outlets located in dwelling unit?

Bedrooms 210.12(A)

Arc-fault protection is required on branch circuits that supply power to outlets in which of the following locations:

Bedrooms and bedroom closets, including smoke detectors 210.8 (A)

For above ground installations for circuit voltage over 1,000 volts, which of the following raceway systems are NOT allowed?

LTFMC 300.37

The transit 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 _______.

So there is a 1/4 inch airspace between it and the wall 300.6 (D)

The calculated load of a feeder or service shall not be less than:

Sum of all loads on the branch circuits 220.40

Which of the following describes the meaning of "ampacity of a conductor"?

The current a conductor can carry continuously under the conditions of use without exceeding its temperature rating. (art. 100)

An EMT raceway runs across an earthquake expansion joint section in a building. The raceway is required to ________.

The raceway must be made electrically continuous by equipment bonding jumpers or other means 250.98

Wiring methods consisting of single conductors for solar photocvoltaic systems shall be permitted to be installed in the same manner as ______.

Type USE-2 multiconductor cable 690.31 (C) (1)

Which of the following devices are required to be protected by an Arc-fault circuit breaker in a dwelling unit wiring application?

Wall mounted luminaries in a bedroom 210.12

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 seperate 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 210.5 (C)(1)

Surface nonmetallic raceways shall not be used _______. a. where concealed b. where subject to serve physical damage c. in hoistways d. all the above

all the above 388.12

The MAXIMUM current that a conductor can carry continuously under the conditions of use without exceeding its temperature rating best defines ________.

ampacity (art. 100)

Cable splices made and insulated by approved methods shall be permitted to be located within a cable tray, provided they ________.

are accessible and project above the side rails where not subject to physical damage. 392.56

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.

b. a 6-foot chain link fence with 12-inches of barbed wire. 110.31

Wiring systems inside boxes must be installed so that conductors contained in them can ___ without removing any part of the building.

be rendered accessible 314.29

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 attachement plug cap is inserted. c. shall have an endlosure that is weatherproof when the receptacle is covered d. both a and b

both a and b 210.8 (B)(4) 406.9 (B)(1)

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 from electrical installers.

c. practical safeguarding of persons and property from hazards arising from the use of electricity. 90.1(A)

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.

c. the smaller the number the larger the wire Table 8, Chapter 9

A load where the maximum surrent is expected to continue for 3 -hours or more is a ______.

continuous load article 100

Which of the following boxes would be permitted for the installation of three 10 AWG conductors and three 6 AWG conductors a. 4in. x1-1/2 in. octagonal box b. 4 in. x1-1/4 in. square box c. 4 in x1-1/2in. square box d. 4-11/16in. x 2-1/8 inch square box

d. 4-11/16in. x 2-1/8 inch square box 314.16 (A) 3-10AWG = 3x2in2=7.5 in3 3-6AWG = 3x5.0in2= 15in3

A 25-foot feeder tap conductor must terminate in ________________________. a. a single set of fuses that will limit the load to the ampacity of the tap conductors. b. a single circuit breaker that will limit the load to the ampacity of the tap conductors c. no protection is required at this point. d. Either a or b

d. Either a or b 240.21 (B)(2)(2)

An emergency light is installed at the exit of an industrial building. Which of the following is an acceptable 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 fixed in place 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 shall be connected to the same branch circuit as the serving the normal lighting circuit in the area ahead of any switching devices. d. all of the above

d. all of the above. 700.12 (F) (2) (3)

Which of the following is not a device? a. dwelling unit doorbell pushbutton b. security alarm system door contact c. fire alarm manual pull station d. loud speaker

d. loud speaker (art. 100, Definition- decive)

Which of the following is NOT considered a health care facility? a. dentist office b. nursing home c. hospital d. veterinarian office

d. veterinarian office 517.2

Luminaries installed under a marquee shall be considered installed in a ______ location.

damp Article 100

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 210.8 (A)

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:

distribution point 547.2

Class II locations are those that are hazardous because of the presence of _____.

dust 502.1

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:

each system branc-circuit panel board or distribution equipment 210.5(C)(1)(C)

Unused cable or raceway openings in boxes, cabinets and cutout boxes shall be ______ to afford protection substantially equivalent to the wall of the equipment.

effectively closed 110.12 (A)

All circuit conductors between the service equipment, the source of a separately derived system, or other power supply source and the final branch-circuit overcurrent device are considered as ____ conductors.

feeder ART. 100

Openings around electrical penetrations through fire-resistant rated walls, partitions, floors, or ceilings shall be ______________ using approved methods to maintain the fire resistance rating.

firestopped 300.21

Type MC cable is permitted to be installed in which of the following conditions?

in a metal raceway 330.12 (A) (1,2)

The voltage rating of equipment shall not be ______ the nominal voltage of a circuit to which it is connected.

less than 110.4

______ equipment shall be installed and used in accordance with any instructions included in the listing, or labeling.

listed or labeled

Electrical equipment rooms or enclosures housing electrical apparatus that are controlled by a lock shall be considered accessible to?

qualified persons 110.26 (F)

All conductors installed in manhole installations shall be cabled, _____, or arranged in an approved manner that provides ready and safe access for persons to enter for installation and maintenance.

racked up 110.74

A laundry sink is installed in a counter top in a dwelling unit laundry room. A receptacle outlet is installed within 6-feet of the sink that serves the counter top. The receptacle is:

required by code to be GFCI protected 210.8 (A)(7)

Each multiwire branch circuit shall be proved with a means that will ____ at the point where the branch circuit originates.

simultaneously disconnect each ungrounded conductor 210.4(B)

Generally, electrical non-metallic tubing (ENT) can be installed in any building exceeding ______ floors above grade if certian installation conditions apply.

three 362.10(1)

Where more than one branch circuit supplies more than one receptacle on the same yoke, a means to simultaneously disconnect the ungrounded coductors supplying those receptacles shall be provided at the panelboard where the branch circuits originated. This may be accomplished by.

two single pole circuit breakers with an approved handletie. one two-pole circuit breaker

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 __________.

written consent of the authority having jurisdiction (article 100)