Journeyman Electrician's Exam — Questions and Answers

Question 1: Per NEC 250.122, if a 200-ampere circuit breaker protects a feeder, what is the minimum size equipment grounding conductor required for copper conductors?

#6 AWG copper
#8 AWG copper
#2 AWG copper
#4 AWG copper (Correct answer)

Correct answer: #4 AWG copper

Per NEC Table 250.122, a 200-ampere overcurrent device requires a minimum #4 AWG copper equipment grounding conductor.

Question 2: Per NEC 110.26(C), at least one entrance not less than 24 inches wide and 6½ feet high is required for rooms containing switchboards or panelboards rated:

Any rating if the room is used exclusively for electrical equipment
400 amperes or more regardless of width
800 amperes or more and over 4 feet wide
1200 amperes or more and over 6 feet wide (Correct answer)

Correct answer: 1200 amperes or more and over 6 feet wide

NEC 110.26(C) requires at least one entrance for electrical rooms containing switchboards or panelboards rated 1200A or more and over 6 feet wide to provide safe egress.

Question 3: Per NEC 517.13, patient care areas in health care facilities require a special grounding arrangement. What is the purpose of requiring both an insulated equipment grounding conductor AND a metallic raceway or cable armor in patient care branch circuits?

To allow higher ampacity in the circuit
To reduce electromagnetic interference from medical equipment
To comply with HIPAA electrical requirements
To provide redundant grounding paths for safety-critical equipment (Correct answer)

Correct answer: To provide redundant grounding paths for safety-critical equipment

NEC 517.13 requires both an insulated EGC and a metallic wiring method to provide two independent grounding paths, reducing the risk of ground faults in patient care areas.

Question 4: How many small appliance branch circuits are required in a dwelling unit kitchen per the NEC?

Three
Two (Correct answer)
One
Four

Correct answer: Two

NEC 210.11(C)(1) requires a minimum of two 20-ampere small appliance branch circuits in a dwelling unit.

Question 5: Under NEC Article 430, the term 'controller' refers to:

The overload relay only
Only magnetic contactors
Only devices rated above 2 HP
Any switch or device used to start and stop a motor (Correct answer)

Correct answer: Any switch or device used to start and stop a motor

NEC 430.81 defines a controller as any switch or device that is normally used to start and stop a motor by making and breaking the motor circuit current.

Question 6: For a conduit offset over an 8-inch high obstacle using 45-degree bends, what is the total shrinkage to deduct from the straight conduit run?

3.31 inches (Correct answer)
4.00 inches
2.00 inches
2.57 inches

Correct answer: 3.31 inches

Shrinkage = 8 x 0.414 = 3.31 inches must be subtracted from the straight conduit run to properly lay out the full run.

Question 7: Per NEC 680.26(D), the pool equipotential bonding conductor must be connected to the:

Equipment grounding conductor of the panelboard (Correct answer)
Grounding electrode at the service entrance
Service entrance phase conductors
Grounded (neutral) conductor at the panel

Correct answer: Equipment grounding conductor of the panelboard

NEC 680.26(D) requires the pool bonding system to be connected to the equipment grounding conductor of the panelboard supplying pool circuits.

Question 8: Using the NEC 220.82 optional calculation method for dwelling units, what percentage applies to all general loads above 10 kVA?

40% (Correct answer)
25%
35%
50%

Correct answer: 40%

NEC 220.82(B) applies 100% to the first 10 kVA of general loads and 40% to all remaining general loads above that.

Question 9: For a continuous-duty motor with a nameplate full-load ampere (FLA) rating of 40A, a service factor of 1.15, and separate overload protection, what is the maximum rating for the overload device?

46A
50A (Correct answer)
40A
60A

Correct answer: 50A

According to NEC 430.32(A)(1), for motors with a service factor of 1.15 or greater, the separate overload device shall be selected to trip at no more than 125% of the motor's nameplate full-load current rating. Therefore, 40A x 1.25 = 50A.

Question 10: A series circuit has a resistance of 6 ohms and an inductive reactance of 8 ohms. What is the total impedance?

14 ohms
48 ohms
2 ohms
10 ohms (Correct answer)

Correct answer: 10 ohms

Z = √(R² + XL²) = √(6² + 8²) = √(36 + 64) = √100 = 10 ohms.

Question 11: A luminaire installed in a Class I, Division 1 hazardous location must be:

Installed in rigid metal conduit (RMC) regardless of the division
Explosion-proof for all Class I hazardous locations regardless of group
Connected to a dedicated circuit with GFCI protection
Listed for the specific class, division, and group of the hazardous location (Correct answer)

Correct answer: Listed for the specific class, division, and group of the hazardous location

NEC Articles 501 through 503 require luminaires in hazardous locations to be specifically listed for the applicable class, division, and group, as different hazardous atmospheres require different protection methods.

Question 12: A grounding electrode conductor is used to connect the grounded conductor to the:

Equipment grounding conductor at the load
Neutral bar at a subpanel
Grounding electrode system (Correct answer)
Service entrance conduit

Correct answer: Grounding electrode system

The grounding electrode conductor connects the grounded (neutral) conductor or equipment to the grounding electrode system.

Question 13: What does a transformer's K-factor rating indicate?

Voltage regulation percentage
Short-circuit withstand capability
Suitability for non-linear (harmonic) loads (Correct answer)
Thermal efficiency at full load

Correct answer: Suitability for non-linear (harmonic) loads

A transformer's K-factor rating indicates how well it can handle harmonic currents generated by non-linear loads such as computers and VFDs.

Question 14: A motor running in an ambient temperature of 50°C when its insulation class is rated for 40°C ambient must have its ampacity-corrected conductors selected based on:

Doubling the FLC to compensate for elevated temperature
The 40°C column of NEC Table 310.15 with no correction factor
Replacing the motor with a higher temperature-rated model before wiring
The standard 75°C conductor ampacity table with a temperature correction factor applied (Correct answer)

Correct answer: The standard 75°C conductor ampacity table with a temperature correction factor applied

Conductors must be derated using the temperature correction factors in NEC Table 310.15(B)(1) when ambient temperature exceeds the conductor's rated ambient.

Question 15: When installing electrical systems for a traveling carnival, what is the minimum size copper equipment grounding conductor (EGC) required for branch circuits supplying rides and concessions?

10 AWG
14 AWG
Sized per Table 250.122 based on the OCPD
12 AWG (Correct answer)

Correct answer: 12 AWG

NEC Article 525 contains specific rules for carnivals and similar events. Section 525.30(C) mandates that the equipment grounding conductor for branch circuits shall not be smaller than 12 AWG copper, providing a more robust ground than might otherwise be required by Table 250.122 for smaller circuits due to the temporary and portable nature of the installations.

Question 16: Per NEC 680.22(A)(4), all 125V, 15 and 20 ampere receptacles located within 20 feet of the inside walls of a permanently installed pool must be:

Tamper-resistant and weatherproof rated only
Locking-type receptacles rated for wet locations
On a dedicated branch circuit
GFCI protected (Correct answer)

Correct answer: GFCI protected

Per NEC 680.22(A)(4), all 125V, 15 and 20A receptacles within 20 feet of the pool inside walls must be GFCI protected.

Question 17: Which 3-phase transformer connection provides a neutral conductor on the secondary side for single-phase loads?

Open delta
Delta-wye (Correct answer)
Delta-delta
Wye-delta

Correct answer: Delta-wye

A delta-wye transformer provides a neutral on the wye secondary, enabling 3-phase 4-wire systems with single-phase branch circuits.

Question 18: In a Class I, Division 1 location, which wiring method is NOT permitted?

Type MI cable
Type NM cable (Correct answer)
Explosion-proof flexible fittings
Threaded rigid metal conduit

Correct answer: Type NM cable

Type NM (nonmetallic sheathed) cable is not permitted in Class I hazardous locations; only approved methods like RMC or MI cable are allowed.

Question 19: A 240V, single-phase motor draws 18 amps at full load. What is the minimum rating of the branch circuit conductors?

20 amps
22.5 amps (Correct answer)
18 amps
25 amps

Correct answer: 22.5 amps

NEC 430.22 requires branch circuit conductors for a single motor to have an ampacity of not less than 125% of the motor FLC: 18 × 1.25 = 22.5 amps.

Question 20: A commercial space has 50 duplex receptacle outlets. Per NEC 220.14(I), what is the total calculated receptacle load?

18,000 VA
5,000 VA
10,000 VA
9,000 VA (Correct answer)

Correct answer: 9,000 VA

Per NEC 220.14(I), each duplex receptacle counts as one outlet at 180 VA, so 50 × 180 VA = 9,000 VA.

Question 21: An electrician is installing a branch circuit for a 10 HP, 230V, 3-phase, continuous-duty induction motor. The motor will be supplied with 75°C rated THWN copper conductors. According to the NEC, what is the minimum size for these branch-circuit conductors?

6 AWG
12 AWG
10 AWG (Correct answer)
8 AWG

Correct answer: 10 AWG

According to NEC Table 430.250, the Full-Load Current (FLC) for a 10 HP, 230V, 3-phase motor is 28A. NEC 430.22 requires that branch-circuit conductors for a single continuous-duty motor have an ampacity of not less than 125% of the motor's FLC. The calculation is 28A x 1.25 = 35A. Referring to NEC Table 310.16, in the 75°C column for copper conductors, a 10 AWG conductor is rated for 35A, making it the minimum required size.

Question 22: Where a 150 kVA, single-phase transformer having a secondary voltage of 120/240 is installed at a multi-family dwelling, the full-load current rating, in amperes, of the secondary is _____.

14 AWG
75 amperes
625 amperes (Correct answer)
24 inches

Correct answer: 625 amperes

To find the full-load current rating of the single-phase transformer apply the single-phase current formula as shown:I = (150 kVA x 1000) / 240 volts = 15,000/240 = 625 amperes

Question 23: Per NEC 220.53, what demand factor applies when four or more fixed appliances (excluding ranges, dryers, space heating, or A/C) are installed in a dwelling unit?

100%
65%
75% (Correct answer)
50%

Correct answer: 75%

NEC 220.53 permits a 75% demand factor when four or more fixed appliances are installed in a dwelling unit.

Question 24: An electrician is installing a motor on a rooftop air-conditioning unit. The motor controller is located inside a mechanical room on the floor below. According to the NEC, what is required for the disconnecting means?

A horsepower-rated switch must be installed within 25 feet of the motor.
The disconnect at the controller must simply be lockable.
A disconnecting means must be located in sight from the motor. (Correct answer)
A circuit breaker in a panelboard on the same floor is sufficient.

Correct answer: A disconnecting means must be located in sight from the motor.

NEC 430.102(B)(1) requires that a disconnecting means for a motor be located 'in sight from' the motor location and the driven machinery location. Article 100 defines 'In Sight From' as being visible and not more than 50 feet away from the equipment. While an exception exists if the controller's disconnect is lockable, the primary and most direct requirement is to have a disconnect within sight.

Question 25: Which NEC article governs the installation of Rigid Metal Conduit (RMC)?

Article 358
Article 344 (Correct answer)
Article 348
Article 342

Correct answer: Article 344

NEC Article 344 covers Rigid Metal Conduit (RMC) installation requirements.

Question 26: Per NEC 314.20, in noncombustible walls such as plaster or tile, what is the maximum allowable setback of an electrical box from the finished surface?

1/4 inch (Correct answer)
0 inches — boxes must be flush
1/2 inch
1 inch

Correct answer: 1/4 inch

NEC 314.20 permits boxes in noncombustible surfaces to be set back a maximum of 1/4 inch from the finished surface.

Question 27: A variable frequency drive (VFD) controls motor speed by varying:

The number of stator poles
Supply voltage only, keeping frequency constant
Both the output frequency and voltage applied to the motor (Correct answer)
Motor field current only

Correct answer: Both the output frequency and voltage applied to the motor

VFDs vary both frequency and voltage (maintaining a constant V/Hz ratio) to control motor speed while preventing magnetic saturation.

Question 28: Per NEC 700.12(B)(2), the minimum duration for monthly load testing of an emergency generator is:

60 minutes
90 minutes
15 minutes
30 minutes (Correct answer)

Correct answer: 30 minutes

NEC 700.12(B)(2) requires monthly testing of emergency generators under load for a minimum of 30 minutes to verify operational reliability.

Question 29: Per NEC 408.40, equipment grounding conductors must terminate within a panelboard on:

The equipment grounding terminal bar (Correct answer)
The main bonding jumper only
The neutral bar at any available lug
Any metal structural component inside the panel

Correct answer: The equipment grounding terminal bar

NEC 408.40 requires equipment grounding conductors to terminate on the equipment grounding terminal bar provided in the panelboard.

Question 30: A grain elevator storage area would most typically be classified as:

Class III, Division 2
Class I, Division 2
Class I, Division 1
Class II, Division 1 (Correct answer)

Correct answer: Class II, Division 1

Grain elevators contain combustible grain dust that is routinely suspended in air under normal operations, making them Class II, Division 1.

Question 31: According to NEC Table 220.12, what is the unit lighting load for a dwelling unit?

4 VA/sq ft
1 VA/sq ft
2 VA/sq ft
3 VA/sq ft (Correct answer)

Correct answer: 3 VA/sq ft

NEC Table 220.12 specifies 3 VA per square foot as the unit lighting load for dwelling units.

Question 32: Per NEC Table 220.55, what is the maximum allowable demand load for a single 10 kW household electric range?

10 kW
8 kW (Correct answer)
12 kW
6 kW

Correct answer: 8 kW

NEC Table 220.55, Column C allows 8 kW demand for a single range rated over 8¾ kW through 12 kW, which includes a 10 kW unit.

Question 33: What is the maximum voltage permitted for a Class 1 remote-control or signaling circuit per NEC Article 725?

150 volts
300 volts
1000 volts
600 volts (Correct answer)

Correct answer: 600 volts

NEC 725.41 limits Class 1 circuits to 600 volts, placing them in the same general voltage range as standard power circuits.

Question 34: When sizing conductors for a continuous load, the conductor must be rated for at least what percentage of the continuous load?

150%
110%
125% (Correct answer)
100%

Correct answer: 125%

NEC 210.19(A)(1) and 215.2(A)(1) require conductors supplying continuous loads to be sized at 125% of the continuous load current.

Question 35: The usage of liquid-tight flexible metallic conduit (LFMC) is not permitted.

12 inches
surge protective device (SPD)
The equipment shall be installed in accordance with the instructions.
where subject to physical damage (Correct answer)

Correct answer: where subject to physical damage

Liquid-tight flexible metallic conduit (LFMC) is designed for flexibility and protection against liquids, but it is not intended for areas where it will be subjected to severe physical damage. Its flexible nature makes it vulnerable to crushing or impact, which could compromise its integrity and the conductors within. Therefore, the NEC prohibits its use in such conditions.

Question 36: Non-IC rated recessed luminaire housings must maintain a minimum clearance of _____ from combustible material on all sides.

1/4 inch
1/2 inch (Correct answer)
2 inches
1 inch

Correct answer: 1/2 inch

NEC 410.116(A)(1) requires non-IC rated recessed luminaire housings to be spaced so that there is not less than 1/2-inch clearance on all sides from combustible material.

Question 37: Per NEC Table 220.12, what is the unit lighting load for a bank?

3.0 VA/sq ft
3.5 VA/sq ft (Correct answer)
1.0 VA/sq ft
2.0 VA/sq ft

Correct answer: 3.5 VA/sq ft

NEC Table 220.12 lists banks at 3½ VA per square foot, one of the higher commercial occupancy lighting loads.

Question 38: What is the primary advantage of using 30-degree offset bends instead of 45-degree bends for the same offset height?

30-degree bends always require a shorter length of conduit between marks
30-degree bends are faster to execute on the job site
30-degree bends create a more gradual angle, resulting in less shrinkage and easier conductor pulling (Correct answer)
30-degree bends are required by NEC for all offsets exceeding 6 inches in height

Correct answer: 30-degree bends create a more gradual angle, resulting in less shrinkage and easier conductor pulling

30-degree offsets produce a more gradual bend angle with less shrinkage (0.25 vs. 0.414 per inch), reducing friction when pulling conductors, though the marks must be placed farther apart.

Question 39: Flexible connections in Class I, Division 1 locations must use:

Standard liquid-tight flexible metal conduit
Standard flexible metal conduit with bonding jumper
PVC flexible conduit
Listed explosion-proof flexible fittings (Correct answer)

Correct answer: Listed explosion-proof flexible fittings

Flexible connections in Class I, Division 1 require listed explosion-proof flexible fittings to maintain the required hazardous location rating.

Question 40: NEC 314.29 requires that junction boxes and pull boxes be:

Labeled with the voltage and ampacity of contained conductors
Accessible without removing any part of the building structure or finish (Correct answer)
Installed only in accessible attics or crawl spaces
Located within 6 feet of the equipment they serve

Correct answer: Accessible without removing any part of the building structure or finish

NEC 314.29 mandates that boxes be accessible without removing permanent building structures or finishes to allow future maintenance.

Question 41: For a branch circuit supplying show window lighting in a commercial occupancy, the NEC requires a load calculation of at least:

3 VA per square foot
180 VA per linear foot (Correct answer)
200 VA per outlet
1500 VA per circuit

Correct answer: 180 VA per linear foot

NEC 220.14(G) requires show window lighting to be calculated at 180 VA per linear foot of show window.

Question 42: A branch circuit supplying a motor must have an ampacity of at least:

115% of the motor full-load current
150% of the motor full-load current
100% of the motor full-load current
125% of the motor full-load current (Correct answer)

Correct answer: 125% of the motor full-load current

NEC 430.22(A) requires branch circuit conductors for a single motor to have an ampacity of at least 125% of the motor's full-load current rating.

Question 43: Which of the following is the maximum standard size non-time-delay fuse that can be used for branch-circuit, short-circuit, and ground-fault protection for a 25 HP, 460V, 3-phase, squirrel-cage motor?

100A
110A (Correct answer)
90A
125A

Correct answer: 110A

First, determine the motor's FLC from NEC Table 430.250, which is 34A for a 25 HP, 460V, 3-phase motor. Next, use NEC Table 430.52, which allows non-time-delay fuses to be sized up to 300% of the FLC for a squirrel-cage motor. The calculation is 34A x 300% = 102A. Since 102A is not a standard fuse size listed in NEC 240.6(A), NEC 430.52(C)(1) Exception No. 1 permits using the next higher standard size. The next standard size above 102A is 110A.

Question 44: The branch circuits delivering 125-volt, single-phase, 15- or 20-ampere outlets in a garage Area in terms of residential occupancies.

7 feet
The circuit breaker is to be capable of being locked in the open position.
A green colored hexagonal headed or shaped terminal screw.
shall not supply any other outlets outside of the garage (Correct answer)

Correct answer: shall not supply any other outlets outside of the garage

The National Electrical Code (NEC) mandates that 125-volt, 15- or 20-ampere branch circuits supplying garage outlets in residential occupancies shall not supply any other outlets outside of the garage. This dedicated circuit requirement helps to isolate potential hazards and ensure adequate capacity for garage-specific loads, preventing overloads from other parts of the dwelling.

Question 45: Emergency lighting required by NEC Article 700 must provide a minimum average illumination at the floor level along the path of egress of:

5 foot-candles average with 1 foot-candle minimum at any point
1 foot-candle average with 0.1 foot-candle minimum at any point (Correct answer)
0.5 foot-candle average with 0.05 foot-candle minimum at any point
10 foot-candles throughout the entire path of egress

Correct answer: 1 foot-candle average with 0.1 foot-candle minimum at any point

Emergency lighting systems must provide an initial average of not less than 1 foot-candle (10.8 lux) with a minimum of 0.1 foot-candle at any point along the path of egress at floor level.

Question 46: An OCPD for a storage battery system must be installed within how many inches of the battery terminals per NEC 480.5?

18 inches
6 inches
12 inches (Correct answer)
24 inches

Correct answer: 12 inches

NEC 480.5 requires the OCPD for battery systems to be installed within 12 inches of the battery terminals to protect the short unprotected conductor.

Question 47: At _____, secondary tie circuits must feature overcurrent protection.

the load and at both ends
both ends (Correct answer)
One end only
the load

Correct answer: both ends

Secondary tie circuits interconnect different secondary networks and require robust overcurrent protection for safety and reliability. To ensure that any fault on the tie circuit is quickly isolated and cleared, overcurrent protective devices must be installed at both ends of the circuit. This prevents power from feeding into a fault from either direction, protecting equipment and personnel.

Question 48: Per NEC 220.51, what percentage of the total connected load must be used for fixed electric space heating loads?

65%
100% (Correct answer)
80%
75%

Correct answer: 100%

NEC 220.51 requires fixed electric space heating loads to be calculated at 100% of the total connected load with no demand reduction.

Question 49: According to NEC 314.28(A)(1), what is the minimum box length required for a straight pull when the largest raceway entering the box is 3-inch trade size?

36 inches
30 inches
24 inches (Correct answer)
18 inches

Correct answer: 24 inches

For straight pulls, the minimum length is 8 times the largest raceway trade size: 8 × 3 = 24 inches.

Question 50: What is the power factor of a purely resistive AC circuit?

0.707
1.0 (Correct answer)
0.5
0

Correct answer: 1.0

A purely resistive circuit has voltage and current in phase (0° phase angle), resulting in a power factor of 1.0 (unity).

Question 51: For storable (portable) swimming pools, receptacles providing power to the pump motor must be:

Standard weatherproof receptacles with in-use covers
Located at least 10 feet away with no other protection required
Protected only if installed within 6 feet of the water
GFCI protected regardless of their distance from the pool (Correct answer)

Correct answer: GFCI protected regardless of their distance from the pool

Per NEC 680.31, all electrical equipment including receptacles used with storable pools must be GFCI protected regardless of distance.

Question 52: Per NEC 680.42(A), the branch circuit wiring to an outdoor permanently installed spa or hot tub must use which wiring method?

Rigid metal conduit, IMC, or liquidtight flexible nonmetallic conduit (Correct answer)
Type UF (underground feeder) cable
Type SE (service entrance) aluminum cable
Type NM-B cable (Romex)

Correct answer: Rigid metal conduit, IMC, or liquidtight flexible nonmetallic conduit

NEC 680.42(A) requires outdoor spa and hot tub wiring to use rigid metal conduit, IMC, or liquidtight flexible nonmetallic conduit; NM-B cable is not permitted in wet outdoor environments.

Question 53: A small appliance branch circuit in a kitchen must be rated at least:

15 amperes, 120 volts
20 amperes, 240 volts
20 amperes, 120 volts (Correct answer)
30 amperes, 120 volts

Correct answer: 20 amperes, 120 volts

NEC 210.11(C)(1) requires small appliance branch circuits to be 20-ampere, 120-volt circuits.

Question 54: What is the maximum number of disconnects permitted for a single service per NEC 230.71?

No limit as long as each disconnect is labeled
Three disconnects
Four disconnects
Six disconnects (Correct answer)

Correct answer: Six disconnects

NEC 230.71 permits a maximum of six switches or circuit breakers as the service disconnecting means, commonly called the 'six-handle rule.'

Question 55: Where flammable liquid-produced vapors or combustible liquid-produced vapors are or may be present in air amounts sufficient to form explosive or ignitable combinations, are those sites classified as class ____ hazardous?

18 inches
I (Correct answer)
eight
III

Correct answer: I

According to the National Electrical Code (NEC), locations where flammable gases or vapors are present in the air in quantities sufficient to produce explosive or ignitable mixtures are classified as Class I hazardous locations. This classification dictates specific requirements for electrical equipment and wiring methods to prevent ignition.

Question 56: Per NEC 680.41, the emergency shutoff or control switch for a spa or hot tub motor must be located at least how far from the unit?

3 feet
8 feet
5 feet (Correct answer)
10 feet

Correct answer: 5 feet

NEC 680.41 requires the emergency shutoff to be located not less than 5 feet from the spa or hot tub and within sight of the equipment.

Question 57: What is the full-load secondary current of a 25 kVA, 480/240V single-phase transformer?

208 amperes
104.2 amperes (Correct answer)
52.1 amperes
26 amperes

Correct answer: 104.2 amperes

I = VA ÷ V = 25,000 ÷ 240 = 104.2 amperes full-load secondary current.

Question 58: You need a 90-degree stub-up of 14 inches in 1" EMT (take-up = 8 inches). Where should the bend mark be placed from the end of the conduit?

6 inches (Correct answer)
4 inches
14 inches
8 inches

Correct answer: 6 inches

Mark location = desired stub height minus take-up = 14 minus 8 = 6 inches from the end of the conduit.

Question 59: What is a "rolling offset" in conduit bending?

An offset that travels in two planes simultaneously, both vertically and horizontally (Correct answer)
An offset technique used only for PVC conduit with a heat gun and rolling motion
A bend made by rolling the conduit on the ground to apply even bender pressure
A series of small incremental bends used to create a smooth curve in one plane

Correct answer: An offset that travels in two planes simultaneously, both vertically and horizontally

A rolling offset must move in two planes at once, requiring trigonometric calculations to determine the true offset distance and the correct angle for bending.

Question 60: What is the required GFCI protection for 125V receptacles installed outdoors at a temporary power distribution system for a construction site?

GFCI is only required for wet locations
All 125V, 15A and 20A receptacles must have GFCI protection (Correct answer)
GFCI is optional at construction sites
GFCI required only for tools rated under 15A

Correct answer: All 125V, 15A and 20A receptacles must have GFCI protection

NEC 590.6 requires GFCI protection for all 125V, 15A and 20A receptacles at construction sites regardless of location type.

Question 61: A motor's NEMA enclosure type '4X' indicates the enclosure is:

Explosion-proof for Class I hazardous locations
Drip-proof and suitable for indoor use only
Watertight, dust-tight, and corrosion-resistant (Correct answer)
Totally enclosed fan-cooled (TEFC) only

Correct answer: Watertight, dust-tight, and corrosion-resistant

NEMA Type 4X enclosures are watertight, dust-tight, and constructed of corrosion-resistant material for demanding indoor or outdoor applications.

Question 62: A 'wye-delta' reduced-voltage starter transitions the motor from wye to delta configuration. What is the purpose of this transition?

To allow the motor to run in both directions
To increase torque during acceleration
To reduce starting current to approximately 1/3 of across-the-line current during start (Correct answer)
To provide dynamic braking when stopping

Correct answer: To reduce starting current to approximately 1/3 of across-the-line current during start

During wye starting, each winding receives line voltage ÷ √3, reducing starting current to about 1/3 of across-the-line (delta) starting current.

Question 63: Per NEC 314.16(B)(4), how does a duplex receptacle (wiring device) count in a box fill calculation?

Two conductors based on the largest AWG in the box (Correct answer)
Devices are exempt from box fill requirements
Three conductors based on the largest AWG in the box
One conductor based on the largest AWG in the box

Correct answer: Two conductors based on the largest AWG in the box

NEC 314.16(B)(4) states each wiring device (switch or receptacle) counts as two conductors based on the largest AWG conductor present in the box.

Question 64: Per NEC 220.61(B)(1), what percentage is applied to calculate the neutral demand load for electric clothes dryers?

70% (Correct answer)
80%
50%
60%

Correct answer: 70%

NEC 220.61(B)(1) requires the neutral load for dryers to be calculated at 70% of the feeder or service demand load.

Question 65: What is a transformer's maximum short-circuit fault current when the secondary nameplate rating is 45 kva, 120/208 volts, three phases, and 1.2% Z?

The transformer full-load ampere rating is 45000 ÷ (208 x 1.732) = 125
125 (transformer full-load amperes) x 83.33 (multiplier) = 10416 (short-circuit fault current) (Correct answer)
The maximum available short-circuit fault current:
The multiplier is 100 ÷ 1.2 = 83.33

Correct answer: 125 (transformer full-load amperes) x 83.33 (multiplier) = 10416 (short-circuit fault current)

For this three-phase transformer the full-load current is 45,000 ÷ (208 × 1.732) = 125 amperes, and the multiplier is 100 ÷ 1.2 = 83.33, giving 125 × 83.33 = 10,416 amperes of fault current. The other choices list only individual calculation steps rather than the complete final answer.

Question 66: A 120/240V single-phase service feeder supplies two 240V loads of 8,000W each and a 120V load of 3,000W. What is the neutral current?

0 A
12.5 A (Correct answer)
25 A
37.5 A

Correct answer: 12.5 A

The 240V loads place no current on the neutral; the 120V load = 3,000W ÷ 120V = 25A on one leg, so neutral carries 12.5A unbalanced current.

Question 67: Per the NEC, what is the maximum total degrees of bends permitted in conduit between pull points?

270 degrees
540 degrees
180 degrees
360 degrees (Correct answer)

Correct answer: 360 degrees

NEC Sections 358.26, 344.26, and similar articles limit total bends to 360 degrees (equivalent of four 90-degree bends) between pull points.

Question 68: Per NEC 680.24(A)(2), junction boxes associated with pool lighting circuits must be located at least how far above the maximum water level?

4 inches
6 inches
8 inches (Correct answer)
12 inches

Correct answer: 8 inches

NEC 680.24(A)(2) requires junction boxes to be mounted at least 8 inches above the maximum water level of the pool.

Question 69: On the same load, two power fuses over 1000 V may be connected in parallel as long as the two fuses are Identical.

have the same rating (Correct answer)
are installed underground
are installed indoors
have the differet ratings

Correct answer: have the same rating

NEC 240.8 generally prohibits connecting overcurrent devices in parallel. However, an exception is made for fuses rated 1000 volts or over, provided they are 'identical in rating and characteristics.' This ensures that the parallel fuses share the load equally and operate simultaneously under fault conditions, preventing an imbalance that could lead to premature failure or inadequate protection.

Question 70: At full voltage, a squirrel cage motor can be started. Designs A, B, C, and D are listed in order.

I only
III & IV only
I, II, III, & IV (Correct answer)
I & II only

Correct answer: I, II, III, & IV

True, squirrel cage motors are designed to handle full voltage starting.

Question 71: A 4-inch square metal box 1-1/2 inches deep has a listed volume of 21 cubic inches. Using only 12 AWG conductors (no devices or clamps), how many conductors are permitted?

14 conductors
9 conductors (Correct answer)
7 conductors
11 conductors

Correct answer: 9 conductors

Each 12 AWG conductor occupies 2.25 cubic inches; 21 ÷ 2.25 = 9.33, which rounds down to 9 conductors maximum.

Question 72: What proportion of the emergency load's rated voltage should a storage battery give at a minimum?

87 2/3 %
15 volts rms
87 6/11 %
87 1/2 % (Correct answer)

Correct answer: 87 1/2 %

A storage battery used for emergency loads should be able to provide at least 87.5% of the rated voltage of the emergency load.

Question 73: What is "shrinkage" in the context of conduit offsets?

The amount the straight conduit run must be shortened to account for horizontal distance lost in the offset (Correct answer)
The reduction in conduit diameter that occurs at the bend point
The amount of scrap material produced when cutting conduit
The amount conduit shortens when it cools after bending

Correct answer: The amount the straight conduit run must be shortened to account for horizontal distance lost in the offset

Shrinkage is the reduction in straight run length required because an offset section covers less horizontal distance than a straight section of equal conduit length would.

Question 74: A 4-11/16 inch square metal box 2-1/8 inches deep has a listed volume of 42 cubic inches. Using only 10 AWG conductors (no devices), how many conductors are permitted?

18 conductors
12 conductors
16 conductors (Correct answer)
14 conductors

Correct answer: 16 conductors

Each 10 AWG conductor occupies 2.50 cubic inches per Table 314.16(B); 42 ÷ 2.50 = 16.8, which rounds down to 16 conductors.

Question 75: Per NEC 314.15, boxes installed in wet locations must be:

Metallic only — nonmetallic boxes are prohibited in wet areas
Listed as weatherproof and suitable for the specific wet or damp location (Correct answer)
Sealed with silicone caulk around all conduit entries
Any NEMA 4X-rated enclosure regardless of listing

Correct answer: Listed as weatherproof and suitable for the specific wet or damp location

NEC 314.15 requires boxes in wet or damp locations to be listed as weatherproof and appropriate for the specific condition (wet vs. damp).

Question 76: A 3-phase, 480-volt, 50 HP motor has a full-load current of 65 amperes. What is the maximum non-time-delay fuse size allowed for branch-circuit short-circuit and ground-fault protection?

175 amperes (Correct answer)
200 amperes
100 amperes
150 amperes

Correct answer: 175 amperes

NEC Table 430.52 allows non-time-delay fuses up to 300% of FLC; 65A × 3.0 = 195A, so the next standard size of 200A applies — but 175A is the largest standard size that does not exceed 300% if we round down: 65 × 3 = 195, nearest standard ≤ 195 is 175A.

Question 77: According to NEC Table 314.16(B), what is the volume allowance assigned to each 14 AWG conductor for box fill calculations?

2.50 cubic inches
2.25 cubic inches
1.75 cubic inches
2.00 cubic inches (Correct answer)

Correct answer: 2.00 cubic inches

NEC Table 314.16(B) assigns a volume allowance of 2.00 cubic inches for each 14 AWG conductor in box fill calculations.

Question 78: Under NEC Article 800, the primary protector for communications circuits must be located:

As close as practicable to the point where the conductors enter the building (Correct answer)
Within 10 feet of the utility network interface device
In a dedicated telephone equipment room
At the main electrical service panel

Correct answer: As close as practicable to the point where the conductors enter the building

NEC 800.90(B) requires the primary protector to be located as close as practicable to the point of entry to minimize the exposure of interior building wiring to lightning surges.

Question 79: When making back-to-back 90-degree bends for a U-shape with a desired INSIDE measurement of 12 inches, how far from the heel of the first 90 is the second bend mark placed?

22 inches
12 inches (Correct answer)
17 inches
6 inches

Correct answer: 12 inches

For back-to-back bends, the second mark is placed at the desired inside measurement (12 inches) measured from the heel of the first completed 90-degree bend.

Question 80: Rigid PVC Conduit (Schedule 40 and Schedule 80) is governed by which NEC article?

Article 352 (Correct answer)
Article 350
Article 348
Article 356

Correct answer: Article 352

NEC Article 352 covers Rigid PVC Conduit, including both Schedule 40 and Schedule 80, and specifies where each schedule is permitted.

Journeyman Electrician's Exam

This exam certifies electricians who demonstrate competency in the installation, maintenance, and repair of electrical systems, adhering to the National Electrical Code (NEC).

Questions

240 min

Time Limit

70%

To Pass

Checking for saved progress...

Exam Rules

You can skip questions and return to them later
Flag questions for review before submitting
No feedback shown until you submit the entire exam
Unanswered questions count as wrong — answer everything
10 pretest questions are mixed in and don't affect your score
Timer auto-submits when time runs out
Your progress is auto-saved every 30 seconds