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JOURNEYMAN NEC 2023 FREE FULL-LENGTH EXAM

Texas Journeyman Electrician Practice Test - Full-Length Test 1

A full-length, 85-question practice exam covering all 8 core NEC topic areas, weighted the same way the real exam is. Modeled on Texas's real licensing exam format.

See Texas electrician licensing requirements, fees & exam format

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240 min

Time

70%

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About This Exam

85 questions, 240 min, 70% to pass — sized and paced like the Texas licensing exam. Finish it to see your score and your 3 weakest topics, free.

Open book: the real Texas exam lets you use the NEC. Keep your code book next to you and practise looking things up.

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TOPICS COVERED

General Requirements Wiring Methods and Materials Load Calculations Equipment for General Use Special Occupancies Wiring and Protection Motor Circuits Special Equipment

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85 questions in 240 minutes, sized and paced like the Texas journeyman exam.

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How to Use This Practice Test

This Texas Journeyman Electrician Practice Test - Full-Length Test 1 has 85 questions with detailed answers and NEC references. Take the full test, review every wrong answer, and look up the NEC article it references before moving on.

Tip: This is an open-book exam — tab your NEC index and Articles 210, 250, and 430 before you start.

Topics covered: Branch circuits, grounding, wiring methods, load calculations, and motors.
Passing score: 70–75% (most states). Aim for 80% on practice tests so the real exam feels easy.
Questions: 85 multiple-choice, one correct answer each

Texas Journeyman Electrician Practice Test - Full-Length Test 1 — Question List

Question 1: Working space depth in front of a 480Y/277V switchboard with exposed live parts on both sides of the working space is (Condition 3, Table 110.26(A)(1)):

3 ft
3.5 ft
4 ft
6 ft

NEC Reference: NEC Table 110.26(A)(1)

Question 2: A 6 AWG THWN copper conductor (75°C rated, 65A per Table 310.16) is installed in a location where the ambient temperature is 50°C. What is the corrected ampacity?

49A — 65A × 0.75 temperature correction
54A — 65A × 0.82
58A — 65A × 0.88
65A — no correction needed below 60°C

NEC Reference: NEC Table 310.15(B)(1)

Question 3: What size copper service-entrance conductors (75°C terminals) are required for a 250 A continuous 3-phase load?

3/0 AWG
250 kcmil
400 kcmil
2/0 AWG

NEC Reference: NEC 230.42(A), Table 310.16

Question 4: You install 1/0 AWG THHN conductors (90°C insulation, 170A per Table 310.16). The terminations on the panel and equipment are marked "75°C." Which ampacity column from Table 310.16 must you use?

The 90°C column — the wire is rated 90°C so that is the limiting factor
The 75°C column — the terminal rating limits you to 75°C ampacity
The 60°C column — always use the most conservative value
Either column — the higher of the two values governs

NEC Reference: NEC 110.14(C)(1)

Question 5: What is the maximum branch circuit load for a 10 kW single electric range in a dwelling unit?

8 kW
10 KW
7 KW
6 KW

NEC Reference: NEC Table 220.55

Question 6: A conductor in a flexible cord has an ampacity of 150 amperes. What is the allowable ampacity of each conductor if 5 current-carrying conductors are in the cord?

120 amperes
135 amperes
140 ampere
105 amperes

NEC Reference: NEC 400.5(A)(3)

Question 7: A panelboard is rated 100 amperes. Per NEC 408.36, the overcurrent device protecting it must be rated:

125 amperes
Not more than 100 amperes
At least 125% of the panelboard rating
Any size listed for the panelboard bus

NEC Reference: NEC 408.36

Question 8: Article 411 low-voltage lighting systems operate at not more than how many volts ac?

30 volts
25 volts
40 volts
35 volts

NEC Reference: NEC 411.1

Question 9: Panelboards must be mounted in which of the following?

Cutout boxes
Cabinets
All of these
Enclosures designed for the purpose

NEC Reference: NEC 408.38

Question 10: What is the maximum primary overcurrent protection for a single-phase 480 V to 120 V transformer rated 900 VA, protected on the primary only?

NEC Reference: NEC 450.3

Question 11: The NEC defines a continuous load as a load that is expected to continue without interruption for at least:

1 hour
2 hours
3 hours
8 hours

NEC Reference: NEC Article 100 (Definitions)

Question 12: Agricultural buildings with metallic livestock confinement equipment (stalls, pens) must have an equipotential plane. What is the main reason for this requirement?

To reduce lightning strike damage to the building
To keep all metal parts at the same voltage and prevent stray voltage from stressing animals
To provide a low-resistance path for short circuit current
To replace the need for grounding electrodes in wet soil

NEC Reference: NEC 547.10

Question 13: What is the minimum size copper conductor permitted for open individual overhead conductors operating over 1000 volts?

No. 6 AWG
No. 8 AWG
No. 10 AWG
No. 12 AWG

NEC Reference: NEC 225.6(A)(2)

Question 14: What is the purpose of a current-limiting fuse (such as a Class J or Class L fuse) compared to a standard breaker?

They last longer before needing replacement
They limit peak fault current by opening before it reaches its full value
They allow higher sustained overloads without blowing
They are rated for continuous 100% loading

NEC Reference: NEC 240.2 / UL 248

Question 15: What demand factor applies to six household electric clothes dryers?

75 %
70 %
85 %
80 %

NEC Reference: NEC Table 220.54

Question 16: What size of feeder conductors are required for a dwelling unit which has a calculated load of 240 A. The service disconnect is rated for 250 A and feeder conductors carry entire load of the dwelling unit?

1/0 AWG
2/0 AWG
3/0 AWG
4/0 AWG

NEC Reference: NEC 310.12, Table 310.16

Question 17: Eight 10 AWG THWN conductors (35A ampacity each) are all installed in the same conduit, and all eight are current-carrying. What is the adjusted ampacity for each conductor?

24.5A — 35A × 0.70 (7–9 conductor factor)
28A — 35A × 0.80 (4–6 conductor factor)
31.5A — 35A × 0.90
35A — no derating needed for 10 AWG

NEC Reference: NEC Table 310.15(C)(1)

Question 18: What minimum working space depth is required for equipment rated 601–1000 volts with exposed live parts on one side and grounded parts on the other (Condition 2)?

3 ft
4 ft
5 ft
6 ft

NEC Reference: NEC Table 110.26(A)(1)

Question 19: When two or more conductors are installed in parallel to form a single large feeder, each individual conductor must be at least what size?

4 AWG copper — any size is fine if the total is adequate
2 AWG copper minimum for parallel conductors
1/0 AWG copper minimum per conductor
4/0 AWG copper — parallel conductors must be very large

NEC Reference: NEC 310.10(H)(1)

Question 20: A central A/C condensing unit nameplate shows a branch-circuit selection current of 24A. What is the maximum overcurrent device allowed on its branch circuit?

30 A
40 A
45 A
60 A

NEC Reference: NEC 440.22(A)

Question 21: Underground ducts or conduits must be sealed where they enter a building.

True
False

NEC Reference: NEC 230.8

Question 22: The electrical room diagram shows a 480V switchboard against a wall. There is 2.5 feet of clear space between the front of the switchboard and a column directly in front of it. The switchboard has exposed live parts on the front only (Condition 1). Is this working clearance adequate?

Yes — 2.5 feet is enough for a 480V switchboard
No — 480V Condition 1 requires at least 3 feet of working clearance
Yes — the 3-foot rule only applies when the switchboard is open
No — 480V equipment always requires at least 4 feet regardless of condition

NEC Reference: NEC Table 110.26(A)(1)

Question 23: A 120/240 V dwelling service is rated 250 amperes. What is the minimum size copper THW service conductor (75°C) permitted?

1/0 AWG
2/0 AWG
3/0 AWG
4/0 AWG

NEC Reference: NEC 310.12, Table 310.16

Question 24: What is permissible voltage drop in percentage for combination of both feeders and branch circuit conductors?

NEC Reference: NEC 215.2(A) Informational Note

Question 25: The volume required for NO.14 conductors to be placed in a outlet box is ____ inch³

2.0
2.25
1.50
2.50

NEC Reference: NEC 314.16

Question 26: The cross sectional area of the conductors permitted in a seal shall not exceed ____ percent of the cross sectional area of a rigid metal conduit of the same trade size.

NEC Reference: NEC 501.15

Question 27: What is the minimum volume allowance for each 16 AWG conductor in a box?

1.75 cu in
2.0 cu in
2.25 cu in
2.5 cu in

NEC Reference: NEC Table 314.16(B)

Question 28: Which NEC table gives the full-load currents used to size conductors for 3-phase ac induction motors?

Table 310.16
Table 430.248
Table 430.250
Table 430.52

NEC Reference: NEC Table 430.250

Question 29: You install a 75 kVA, 480–208Y/120V transformer in a building. The secondary creates a separately derived system. Where should the main bonding jumper (system bond) be made?

At the transformer secondary terminals or at the first disconnect — but only one location
At the transformer and again at every subpanel fed from it
At the main service entrance of the building
No bonding is required on the secondary of a separately derived system

NEC Reference: NEC 250.30(A)(1)

Question 30: What is the minimum feeder or service load for cloth dryers in a dwelling unit?

5000 watts
2500 watts
4000 watts
6500 watts

NEC Reference: NEC 220.54

Question 31: For a stationary motor rated ____ or less that is normally left running and cannot be damaged by overload or failure to start, the branch-circuit overcurrent device may serve as the controller.

½ horsepower
⅛ horsepower
1 horsepower
5 horsepower

NEC Reference: NEC 430.81

Question 32: How many 20-ampere, 120-volt branch circuits are required for the general lighting load of a 2,500 sq ft dwelling unit?

NEC Reference: NEC 220.41, 210.11(A)

Question 33: The EMT conduit run in between two terminal points shall be securely fastened within ____ of a outlet box.

3 ft
10 ft
8 ft
5 ft

NEC Reference: NEC 358.30(A)

Question 34: A flexible cord supplying a pendant luminaire in a Class II location must be listed for:

Hard use
Extra hard use
Class II use
Normal use

NEC Reference: NEC 502.140

Question 35: What is the minimum ampacity of a tap conductor supplying an industrial heating appliance from a 30 A branch circuit?

10 amperes
15 amperes
20 amperes
25 amperes

NEC Reference: NEC 210.19(A)(4)

Question 36: A single-phase, 230-volt motor has a nameplate full-load current of 40 A and no marked service factor or temperature rise. What is the maximum overload protection rating?

46 amperes
40 amperes
50 amperes
60 amperes

NEC Reference: NEC 430.32

Question 37: A service drop crosses three areas: Point A over a pedestrian sidewalk at the house entrance (11 ft clearance), Point B over the residential driveway (12 ft), and Point C over an alley used by delivery trucks (16 ft). Which clearance is a violation?

Point A
Point C
Point B
None of them

NEC Reference: NEC 230.24(B)

Question 38: A cord and plug device used as disconnecting means for a motor must be rated for ____

Horsepower
Voltage
Resistance
Current

NEC Reference: NEC 430.109(F)

Question 39: Metallic gas piping in a building must be bonded per 250.104(B). The bonding conductor is sized using which NEC table?

Table 250.66 — same as the GEC
Table 250.122 — based on the OCPD likely to energize the piping
Table 310.16 — ampacity of the conductor
The same size as the service neutral conductor

NEC Reference: NEC 250.104(B)

Question 40: What is the minimum power outlet required at each recreational vehicle site in an RV park?

A 15A, 125V general outlet is all that is required
At least one 20A, 125V outlet plus a 30A or 50A RV receptacle
A 60A, 240V outlet only
No minimum outlet requirement — owner decides

NEC Reference: NEC 551.77

Question 41: Cranes and hoists are covered by which NEC article?

Article 430
Article 530
Article 610
Article 670

NEC Reference: NEC Article 610

Question 42: A motor-generator arc welder has a primary current rating of 30 A and a 30% duty cycle. What is the minimum size copper branch-circuit conductor (60°C)?

12 AWG
10 AWG
14 AWG
8 AWG

NEC Reference: NEC 630.11(A)

Question 43: The grounding electrode conductor (GEC) connecting to a ground rod does not need to be larger than what size copper conductor?

4 AWG copper
6 AWG copper
8 AWG copper
10 AWG copper

NEC Reference: NEC 250.66(A)

Question 44: When four or more fixed appliances (other than ranges, dryers, A/C, or space heating) are on a feeder, the demand factor per 220.53 allows you to use what percentage of the total connected load?

50%
65%
75%
100%

NEC Reference: NEC 220.53

Question 45: A dwelling must have at least one dedicated branch circuit for the bathroom. What must that circuit be rated?

At least one 15A dedicated circuit
At least one 20A dedicated circuit
Two 15A circuits — one for each bathroom
Bathrooms can share any general lighting circuit

NEC Reference: NEC 210.11(C)(3)

Question 46: What is the maximum primary overcurrent device rating for a single-phase 480 V to 120 V transformer rated 1.8 kVA, protected on the primary only?

6 A
7 A
4 A
10 A

NEC Reference: NEC 450.3

Question 47: Cabinets and cutout boxes installed in wet locations must be:

Weatherproof
Watertight
Airtight
Raintight

NEC Reference: NEC 312.2

Question 48: What is the adjusted ampacity of 3/0 copper THWN conductors in a wet location if the raceway contains seven current-carrying conductors?

122.5 amperes
125.5 amperes
140 amperes
133 amperes

NEC Reference: NEC 310.16

Question 49: What is the maximum support interval for a 2-inch rigid metal conduit (RMC) run?

10 feet
12 feet
16 feet
20 feet

NEC Reference: NEC Table 344.30(B)(2)

Question 50: What is the maximum voltage between conductors for branch circuits supplying luminaires in a dwelling unit?

120 volts
240 volts
150 volts
480 volts

NEC Reference: NEC 210.6

Question 51: Signs and outline lighting must be at least how many feet above areas accessible to vehicles, unless protected from physical damage?

NEC Reference: NEC 600.9

Question 52: Per NEC Table 220.42(A), what is the general lighting unit load for a religious facility (church)?

2.2 VA per sq ft
1 VA per sq ft
3 VA per sq ft
1.4 VA per sq ft

NEC Reference: NEC Table 220.42(A)

Question 53: An instantaneous-trip circuit breaker (used for motor branch circuits) has no intentional time delay. What is the main advantage of this type of breaker?

It provides overload protection without a relay
It trips quickly on fault current but does not trip on motor inrush
It can be used without any other motor protection
It is the only type allowed for residential use

NEC Reference: NEC 430.52(C)(3)

Question 54: The panel diagram shows a 120/240V panel with a multiwire branch circuit. Circuit 1 is a single-pole 20A breaker with a black wire and circuit 3 is a single-pole 20A breaker with a red wire — both share a white neutral wire. Is this panel wiring correct?

Yes — two single-pole breakers are fine if they are on opposite legs
No — a handle tie or 2-pole breaker is required for multiwire branch circuits
Yes — as long as the neutral is the same color throughout
No — multiwire branch circuits are not permitted in residential panels

NEC Reference: NEC 210.4(B)

Question 55: The branch-circuit overcurrent device of a stationary motor rated ____ or less may serve as the motor's controller.

5 hp
3 hp
1 hp
1/8 hp

NEC Reference: NEC 430.81(A)

Question 56: What is the maximum continuous load that can be connected on a 240 volts 30 amperes circuit using two 10 AWG conductors?

24 amperes
30 amperes
26 amperes
28 amperes

NEC Reference: NEC 210.20(A)

Question 57: A 50 HP, 460-volt, 3-phase motor is supplied by THWN conductors. What minimum ampacity must the branch-circuit conductors have?

81.25 amperes
74.75 amperes
70 amperes
85 amperes

NEC Reference: NEC 430.250

Question 58: What is the general lighting load for a 6,000 sq ft hospital, before demand factors?

9,600 VA
6,000 VA
12,000 VA
3,000 VA

NEC Reference: NEC Table 220.42(A)

Question 59: Constant-wattage heating cables embedded in concrete floors must not exceed how many watts per linear meter?

54 W/m (16½ W/ft)
16½ W/m
36 W/m
22½ W/m

NEC Reference: NEC 424.44(A)

Question 60: A panelboard contains snap switches rated 25 amperes. The panelboard must have overcurrent protection rated not more than:

200 amperes
30 amperes
120 amperes
150 amperes

NEC Reference: NEC 408.36(A)

Question 61: What is the maximum fuse rating to protect a 12 AWG copper branch-circuit conductor?

20 amperes
35 amperes
25 amperes
40 amperes

NEC Reference: NEC 240.4(D)(5)

Question 62: Liquidtight flexible nonmetallic conduit (LFNC) used as a flexible connection to equipment must not exceed what maximum length?

3 feet
4½ feet
6 feet
10 feet

NEC Reference: NEC 356.60

Question 63: Per NEC Table 220.42(A), what is the general lighting unit load for hotels and motels?

1.7 VA per sq ft
2 VA per sq ft
2.5 VA per sq ft
3 VA per sq ft

NEC Reference: NEC Table 220.42(A)

Question 64: A 75 kVA 480–208Y/120V transformer creates a separately derived system. The system bonding jumper is sized using:

Table 250.66
Table 250.102(C)(1)
Table 250.122
Table 310.16

NEC Reference: NEC 250.30(A)(1)

Question 65: A panelboard is equipped with 30-ampere snap switches. Its overcurrent protection must be rated not more than:

200 amperes
100 amperes
50 amperes
150 amperes

NEC Reference: NEC 408.36(A)

Question 66: What copper THW conductor (75°C terminals) is needed for a 40 A single-phase continuous-duty motor?

No 8 THW
No 6 THW
No 12 THW
No 14 THW

NEC Reference: NEC 430.22, Table 310.16

Question 67: What is the minimum general lighting load for a 1,500 sq ft single-family dwelling unit?

4500 VA
4800 VA
3000 VA
1500 VA

NEC Reference: NEC 220.41

Question 68: What is the minimum size electrical service required for a single family dwelling unit?

100 amperes
150 amperes
200 amperes
50 amperes

NEC Reference: NEC 230.79(C)

Question 69: An 8-unit multifamily building has a 5 kW electric dryer in each unit. What is the total dryer demand load for the service or feeder?

24 KW
40 KW
20 KW
30 KW

NEC Reference: NEC 220.54

Question 70: Surface metal raceways are NOT permitted:

In dry locations
In office buildings
In hoistways
On exposed wall surfaces

NEC Reference: NEC 386.12

Question 71: Per 445.13, the conductors running from a generator output terminals to the first overcurrent device must be sized at what percentage of the generator nameplate current rating?

100%
115%
125%
150%

NEC Reference: NEC 445.13

Question 72: Six mobile homes are supplied by a single feeder. What demand factor is used for the feeder load?

29 %
33 %
28%
35%

NEC Reference: NEC Table 550.31

Question 73: What is the maximum continuous load that can be connected to 240 volts 30 amperes branch circuit?

24 amperes
30 amperes
20 amperes
26 amperes

NEC Reference: NEC 210.20

Question 74: Lightning protection system ground terminals must be bonded to which grounding electrode system?

The building or structure grounding electrode system
A distribution panelboard
The service entrance only
A separate isolated electrode

NEC Reference: NEC 250.106

Question 75: What is the minimum size electrical service is required for a single family dwelling unit?

100 amperes
50 amperes
150 amperes
175 amperes

NEC Reference: NEC 230.79(C)

Question 76: In Class I, Division 1 locations, boxes and fittings for joints and splices must be:

Explosion proof
Water proof
Dust proof
Fire proof

NEC Reference: NEC 500.7(A)

Question 77: A store's sign circuit load must be treated as what type of load for conductor and overcurrent device sizing?

Continuous load
Momentary load
It is exempt from sizing rules
Non-continuous load, always

NEC Reference: NEC 220.14(F)

Question 78: Two motors share a feeder: 25 HP 3φ 460V (FLC 34A) and 10 HP 3φ 460V (FLC 14A). Per 430.24, minimum feeder conductor ampacity is:

48A
56.5A
60A
70A

NEC Reference: NEC 430.24

Question 79: An existing receptacle outlet box in an older home has no equipment grounding conductor present. Per 406.4(D), what are some of the compliant options for replacing the receptacle?

A non-grounding replacement, or a GFCI-protected receptacle marked accordingly, among other listed options
The only option is to run an entirely new grounding conductor back to the panel
No replacement is allowed without a grounding conductor, ever
Any standard grounding-type receptacle may be installed with no special marking or GFCI needed

NEC Reference: NEC 406.4(D)

Question 80: A dwelling has 1,700 square feet of floor area under NEC rules. Using 220.41, what is the general lighting load before any demand factors are applied?

1,700 VA
3,400 VA
5,100 VA
6,800 VA

NEC Reference: NEC 220.41

Question 81: When sizing branch circuit conductors for a motor, which current value should be used?

The motor nameplate full-load current
The NEC table full-load current values
The locked-rotor current from the nameplate
The service factor current

NEC Reference: NEC 430.6(A)(1)

Question 82: A Washington homeowner installs a 48-amp, 240-volt EV charger (120 volts to ground). Does 625.43 require a separate, readily accessible disconnecting means for it?

No, the 625.43 disconnect rule applies only to equipment rated over 60 A or over 150 V to ground
Yes, every EV charger needs a separate 200-amp disconnect
Yes, but only if it is installed outdoors
Yes, a GFCI breaker must be added as the disconnect

NEC Reference: NEC 625.43

Question 83: NEC Table 310.16 lists conductor ampacity based on ambient temperature and how many current-carrying conductors in a raceway or cable?

Three
Six
One
Nine

NEC Reference: NEC Table 310.16

Question 84: A branch circuit in a Colorado commercial building supplies a continuous load of 36 amps only. Per 210.20(A), what is the minimum required overcurrent device rating?

36 amps
40 amps
45 amps
50 amps

NEC Reference: NEC 210.20(A)

Question 85: A fluorescent luminaire supplied by a multiwire branch circuit and containing double-ended lamp ballast(s) must have a disconnecting means to disconnect:

All ungrounded conductors supplying the ballast(s)
Only the grounded (neutral) conductor
No disconnect is ever required for fluorescent fixtures
Only the equipment grounding conductor

NEC Reference: NEC 410.130(G)

Key NEC References for This Test

Article	What It Covers
Art. 100	Definitions — know: feeder, branch circuit, OCPD, dwelling unit
Art. 210	Branch Circuits — GFCI/AFCI locations, circuit ratings, outlet spacing (most tested)
Art. 220	Load Calculations — dwelling unit standard method
Art. 250	Grounding & Bonding — GEC sizing, electrode system, EGC
Art. 310	Conductors — ampacity (Table 310.12), insulation, derate rules
Art. 430	Motors — conductor 125% FLA, OCPD 250% FLA, overloads, disconnects

Study Tip: Tab Articles 210, 250, and 430 in your NEC before the exam. Know the Table 310.12 ampacity values for 14, 12, 10, 8, 6, and 4 AWG copper.

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Texas Journeyman Electrician Practice Test - Full-Length Test 1

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Texas Journeyman Electrician Practice Test - Full-Length Test 1 — Question List

Question 1: Working space depth in front of a 480Y/277V switchboard with exposed live parts on both sides of the working space is (Condition 3, Table 110.26(A)(1)):

Question 2: A 6 AWG THWN copper conductor (75°C rated, 65A per Table 310.16) is installed in a location where the ambient temperature is 50°C. What is the corrected ampacity?

Question 3: What size copper service-entrance conductors (75°C terminals) are required for a 250 A continuous 3-phase load?

Question 4: You install 1/0 AWG THHN conductors (90°C insulation, 170A per Table 310.16). The terminations on the panel and equipment are marked "75°C." Which ampacity column from Table 310.16 must you use?

Question 5: What is the maximum branch circuit load for a 10 kW single electric range in a dwelling unit?

Question 6: A conductor in a flexible cord has an ampacity of 150 amperes. What is the allowable ampacity of each conductor if 5 current-carrying conductors are in the cord?

Question 7: A panelboard is rated 100 amperes. Per NEC 408.36, the overcurrent device protecting it must be rated:

Question 8: Article 411 low-voltage lighting systems operate at not more than how many volts ac?

Question 9: Panelboards must be mounted in which of the following?

Question 10: What is the maximum primary overcurrent protection for a single-phase 480 V to 120 V transformer rated 900 VA, protected on the primary only?

Question 11: The NEC defines a continuous load as a load that is expected to continue without interruption for at least:

Question 12: Agricultural buildings with metallic livestock confinement equipment (stalls, pens) must have an equipotential plane. What is the main reason for this requirement?

Question 13: What is the minimum size copper conductor permitted for open individual overhead conductors operating over 1000 volts?

Question 14: What is the purpose of a current-limiting fuse (such as a Class J or Class L fuse) compared to a standard breaker?

Question 15: What demand factor applies to six household electric clothes dryers?

Question 16: What size of feeder conductors are required for a dwelling unit which has a calculated load of 240 A. The service disconnect is rated for 250 A and feeder conductors carry entire load of the dwelling unit?

Question 17: Eight 10 AWG THWN conductors (35A ampacity each) are all installed in the same conduit, and all eight are current-carrying. What is the adjusted ampacity for each conductor?

Question 18: What minimum working space depth is required for equipment rated 601–1000 volts with exposed live parts on one side and grounded parts on the other (Condition 2)?

Question 19: When two or more conductors are installed in parallel to form a single large feeder, each individual conductor must be at least what size?

Question 20: A central A/C condensing unit nameplate shows a branch-circuit selection current of 24A. What is the maximum overcurrent device allowed on its branch circuit?

Question 21: Underground ducts or conduits must be sealed where they enter a building.

Question 22: The electrical room diagram shows a 480V switchboard against a wall. There is 2.5 feet of clear space between the front of the switchboard and a column directly in front of it. The switchboard has exposed live parts on the front only (Condition 1). Is this working clearance adequate?

Question 23: A 120/240 V dwelling service is rated 250 amperes. What is the minimum size copper THW service conductor (75°C) permitted?

Question 24: What is permissible voltage drop in percentage for combination of both feeders and branch circuit conductors?

Question 25: The volume required for NO.14 conductors to be placed in a outlet box is ____ inch3

Question 26: The cross sectional area of the conductors permitted in a seal shall not exceed ____ percent of the cross sectional area of a rigid metal conduit of the same trade size.

Question 27: What is the minimum volume allowance for each 16 AWG conductor in a box?

Question 28: Which NEC table gives the full-load currents used to size conductors for 3-phase ac induction motors?

Question 29: You install a 75 kVA, 480–208Y/120V transformer in a building. The secondary creates a separately derived system. Where should the main bonding jumper (system bond) be made?

Question 30: What is the minimum feeder or service load for cloth dryers in a dwelling unit?

Question 31: For a stationary motor rated ____ or less that is normally left running and cannot be damaged by overload or failure to start, the branch-circuit overcurrent device may serve as the controller.

Question 32: How many 20-ampere, 120-volt branch circuits are required for the general lighting load of a 2,500 sq ft dwelling unit?

Question 33: The EMT conduit run in between two terminal points shall be securely fastened within ____ of a outlet box.

Question 34: A flexible cord supplying a pendant luminaire in a Class II location must be listed for:

Question 35: What is the minimum ampacity of a tap conductor supplying an industrial heating appliance from a 30 A branch circuit?

Question 36: A single-phase, 230-volt motor has a nameplate full-load current of 40 A and no marked service factor or temperature rise. What is the maximum overload protection rating?

Question 37: A service drop crosses three areas: Point A over a pedestrian sidewalk at the house entrance (11 ft clearance), Point B over the residential driveway (12 ft), and Point C over an alley used by delivery trucks (16 ft). Which clearance is a violation?

Question 38: A cord and plug device used as disconnecting means for a motor must be rated for ____

Question 39: Metallic gas piping in a building must be bonded per 250.104(B). The bonding conductor is sized using which NEC table?

Question 40: What is the minimum power outlet required at each recreational vehicle site in an RV park?

Question 41: Cranes and hoists are covered by which NEC article?

Question 42: A motor-generator arc welder has a primary current rating of 30 A and a 30% duty cycle. What is the minimum size copper branch-circuit conductor (60°C)?

Question 43: The grounding electrode conductor (GEC) connecting to a ground rod does not need to be larger than what size copper conductor?

Question 44: When four or more fixed appliances (other than ranges, dryers, A/C, or space heating) are on a feeder, the demand factor per 220.53 allows you to use what percentage of the total connected load?

Question 45: A dwelling must have at least one dedicated branch circuit for the bathroom. What must that circuit be rated?

Question 46: What is the maximum primary overcurrent device rating for a single-phase 480 V to 120 V transformer rated 1.8 kVA, protected on the primary only?

Question 47: Cabinets and cutout boxes installed in wet locations must be:

Question 48: What is the adjusted ampacity of 3/0 copper THWN conductors in a wet location if the raceway contains seven current-carrying conductors?

Question 49: What is the maximum support interval for a 2-inch rigid metal conduit (RMC) run?

Question 50: What is the maximum voltage between conductors for branch circuits supplying luminaires in a dwelling unit?

Question 51: Signs and outline lighting must be at least how many feet above areas accessible to vehicles, unless protected from physical damage?

Question 52: Per NEC Table 220.42(A), what is the general lighting unit load for a religious facility (church)?

Question 53: An instantaneous-trip circuit breaker (used for motor branch circuits) has no intentional time delay. What is the main advantage of this type of breaker?

Question 54: The panel diagram shows a 120/240V panel with a multiwire branch circuit. Circuit 1 is a single-pole 20A breaker with a black wire and circuit 3 is a single-pole 20A breaker with a red wire — both share a white neutral wire. Is this panel wiring correct?

Question 55: The branch-circuit overcurrent device of a stationary motor rated ____ or less may serve as the motor's controller.

Question 56: What is the maximum continuous load that can be connected on a 240 volts 30 amperes circuit using two 10 AWG conductors?

Question 57: A 50 HP, 460-volt, 3-phase motor is supplied by THWN conductors. What minimum ampacity must the branch-circuit conductors have?

Question 58: What is the general lighting load for a 6,000 sq ft hospital, before demand factors?

Question 59: Constant-wattage heating cables embedded in concrete floors must not exceed how many watts per linear meter?

Question 60: A panelboard contains snap switches rated 25 amperes. The panelboard must have overcurrent protection rated not more than:

Question 61: What is the maximum fuse rating to protect a 12 AWG copper branch-circuit conductor?

Question 62: Liquidtight flexible nonmetallic conduit (LFNC) used as a flexible connection to equipment must not exceed what maximum length?

Question 63: Per NEC Table 220.42(A), what is the general lighting unit load for hotels and motels?

Question 64: A 75 kVA 480–208Y/120V transformer creates a separately derived system. The system bonding jumper is sized using:

Question 65: A panelboard is equipped with 30-ampere snap switches. Its overcurrent protection must be rated not more than:

Question 66: What copper THW conductor (75°C terminals) is needed for a 40 A single-phase continuous-duty motor?

Question 67: What is the minimum general lighting load for a 1,500 sq ft single-family dwelling unit?

Question 68: What is the minimum size electrical service required for a single family dwelling unit?

Question 69: An 8-unit multifamily building has a 5 kW electric dryer in each unit. What is the total dryer demand load for the service or feeder?

Question 25: The volume required for NO.14 conductors to be placed in a outlet box is ____ inch³