P RA CTICE EXA MINATION · 20 26 /20 27 ED ITION
Michigan Journeyman
Test Questions with
Complete Solutions
One hundred scenario-based questions with complete answers
and code-cited rationales for the State of Michigan Journeyman
Electrician examination, based on the National Electrical Code as
adopted by Michigan, including Michigan amendments. Aligned
with the EL 260 - National Electrical Code (NEC) course domains:
conductors and ampacity, wiring methods, equipment and special
occupancies, grounding and bonding, and load calculations.
National Electrical Code · Michigan Amendments Included
Examination administered by PSI · State of Michigan Licensing
E L 2 60 - N ATIO N A L E LE CTRICA L CO DE · 1 00 Q UE STIO N S · CO MPLE TE SO LUTIO N S
,MICHIGAN JOURNEYMAN TEST QUESTIONS - COMPLETE SOLUTIONS 2026/2027
Table of Contents
About This Examination 2
Section 1: Conductors, Ampacity, and Conduit Fill 3
Section 2: Wiring Methods, Materials, and Installation 10
Section 3: Equipment, Fixtures, and Special Occupancies 18
Section 4: Grounding, Bonding, and Electrical Protection 25
Section 5: Load Calculations and General Code Compliance 31
NEC-Based Practice Examination 1
,MICHIGAN JOURNEYMAN TEST QUESTIONS - COMPLETE SOLUTIONS 2026/2027
About This Examination
This comprehensive practice examination is designed to help candidates prepare for the State of Michigan
Journeyman Electrician licensing examination administered by PSI. The assessment is based on the National
Electrical Code (NEC) as adopted by Michigan, including Michigan-specific amendments and administrative
rules that govern licensing, permitting, and jobsite supervision. The one hundred questions in this document
mirror the breadth of the licensing examination and follow the domain structure used in coursework such as
EL 260 - National Electrical Code (NEC), which emphasizes the application and interpretation of the code
rather than memorization alone.
Every question is written in a scenario-based format that asks what is the minimum, the maximum, or the
correct requirement for a real installation condition, because that is how the licensing examination tests code
application. Each question carries four answer options, one correct answer, and a complete rationale. The
correct option is marked inline with a [CORRECT] tag, and every rationale cites the specific NEC article,
table, or Michigan administrative rule that governs the situation, along with the reasoning that disqualifies the
incorrect options. Candidates should study the rationales as carefully as the questions themselves, since the
cited tables and articles are the same ones that must be located quickly during the open-book examination.
The table below maps the one hundred questions to the five content domains. A realistic study session consists
of answering twenty questions at a time under timed conditions, scoring the answers, and then reviewing every
rationale, including the rationales of questions answered correctly by guessing. Because Michigan adopts a
specific NEC edition with state amendments, candidates should verify all cited article numbers against the
code edition and amendment package currently adopted for their examination cycle.
Section Questions Focus Areas
Section 1 Q1 - Q20 Conductor sizing, ampacity derating, ambient correction, conduit fill
Section 2 Q21 - Q40 Wiring methods, securing and support distances, underground cover, box fill
Section 3 Q41 - Q60 Appliance cords, luminaires, pools, PV systems, motors, rooftop equipment
Grounding electrodes, bonding jumpers, EGC sizing, GFCI, AFCI, overcurrent
Section 4 Q61 - Q80
devices
Section 5 Q81 - Q100 Service and feeder load calculations, continuous loads, voltage drop, Michigan rules
Examination content map: 100 questions across five domains
NEC-Based Practice Examination 2
, MICHIGAN JOURNEYMAN TEST QUESTIONS - COMPLETE SOLUTIONS 2026/2027
Section 1: Conductors, Ampacity, and Conduit Fill
Q1. What is the minimum AWG size conductor required for a 70-amp load when there are six THHN
conductors in a raceway, all connected to a 75°C rated circuit breaker?
A. 6 AWG
B. 4 AWG [CORRECT]
C. 3 AWG
D. 2 AWG
Correct Answer: B
Rationale: Per NEC Table 310.16, 4 AWG THHN copper is rated 95 amps in the 90°C column. Because six
current-carrying conductors are installed in one raceway, the ampacity must be adjusted to 80 percent (NEC Table
310.15(B)(3)(a), shown as Table 310.15(C)(1) in the 2020/2023 NEC). The adjusted ampacity is 95 × 0.80 = 76
amps, which is sufficient for the 70-amp load. The 75°C termination check also passes, since 4 AWG at 75°C is
rated 85 amps (NEC 110.14(C)). Option A (6 AWG) fails because 75 × 0.80 = 60 amps is less than 70 amps.
Options C and D would work but are larger than the minimum, so they are not the correct minimum size.
Q2. Three 120/240V, 3-wire circuits of #10 TW conductors are installed in one 1-inch conduit. Each
circuit consists of two phase conductors, one grounded (neutral) conductor, and one equipment grounding
conductor. What is the maximum allowable ampacity per phase conductor after applying all required
correction and adjustment factors?
A. 18 amps
B. 21 amps
C. 24 amps [CORRECT]
D. 30 amps
Correct Answer: C
Rationale: The conduit contains 12 conductors total, but only 6 are current-carrying. The neutral of a 120/240V,
3-wire circuit carries only unbalanced current and is not counted (NEC 310.15(B)(5)(a)), and equipment grounding
conductors are never counted (NEC 310.15(B)(4)). With 4 through 6 current-carrying conductors, the adjustment
factor is 80 percent (NEC Table 310.15(B)(3)(a)). A #10 TW conductor is rated 30 amps at 60°C (Table 310.16), so
30 × 0.80 = 24 amps. Option D (30 amps) ignores derating, Option B (21 amps) wrongly applies the 70 percent
factor for 7-9 conductors, and Option A (18 amps) wrongly applies the 60 percent factor.
NEC-Based Practice Examination 3
Michigan Journeyman
Test Questions with
Complete Solutions
One hundred scenario-based questions with complete answers
and code-cited rationales for the State of Michigan Journeyman
Electrician examination, based on the National Electrical Code as
adopted by Michigan, including Michigan amendments. Aligned
with the EL 260 - National Electrical Code (NEC) course domains:
conductors and ampacity, wiring methods, equipment and special
occupancies, grounding and bonding, and load calculations.
National Electrical Code · Michigan Amendments Included
Examination administered by PSI · State of Michigan Licensing
E L 2 60 - N ATIO N A L E LE CTRICA L CO DE · 1 00 Q UE STIO N S · CO MPLE TE SO LUTIO N S
,MICHIGAN JOURNEYMAN TEST QUESTIONS - COMPLETE SOLUTIONS 2026/2027
Table of Contents
About This Examination 2
Section 1: Conductors, Ampacity, and Conduit Fill 3
Section 2: Wiring Methods, Materials, and Installation 10
Section 3: Equipment, Fixtures, and Special Occupancies 18
Section 4: Grounding, Bonding, and Electrical Protection 25
Section 5: Load Calculations and General Code Compliance 31
NEC-Based Practice Examination 1
,MICHIGAN JOURNEYMAN TEST QUESTIONS - COMPLETE SOLUTIONS 2026/2027
About This Examination
This comprehensive practice examination is designed to help candidates prepare for the State of Michigan
Journeyman Electrician licensing examination administered by PSI. The assessment is based on the National
Electrical Code (NEC) as adopted by Michigan, including Michigan-specific amendments and administrative
rules that govern licensing, permitting, and jobsite supervision. The one hundred questions in this document
mirror the breadth of the licensing examination and follow the domain structure used in coursework such as
EL 260 - National Electrical Code (NEC), which emphasizes the application and interpretation of the code
rather than memorization alone.
Every question is written in a scenario-based format that asks what is the minimum, the maximum, or the
correct requirement for a real installation condition, because that is how the licensing examination tests code
application. Each question carries four answer options, one correct answer, and a complete rationale. The
correct option is marked inline with a [CORRECT] tag, and every rationale cites the specific NEC article,
table, or Michigan administrative rule that governs the situation, along with the reasoning that disqualifies the
incorrect options. Candidates should study the rationales as carefully as the questions themselves, since the
cited tables and articles are the same ones that must be located quickly during the open-book examination.
The table below maps the one hundred questions to the five content domains. A realistic study session consists
of answering twenty questions at a time under timed conditions, scoring the answers, and then reviewing every
rationale, including the rationales of questions answered correctly by guessing. Because Michigan adopts a
specific NEC edition with state amendments, candidates should verify all cited article numbers against the
code edition and amendment package currently adopted for their examination cycle.
Section Questions Focus Areas
Section 1 Q1 - Q20 Conductor sizing, ampacity derating, ambient correction, conduit fill
Section 2 Q21 - Q40 Wiring methods, securing and support distances, underground cover, box fill
Section 3 Q41 - Q60 Appliance cords, luminaires, pools, PV systems, motors, rooftop equipment
Grounding electrodes, bonding jumpers, EGC sizing, GFCI, AFCI, overcurrent
Section 4 Q61 - Q80
devices
Section 5 Q81 - Q100 Service and feeder load calculations, continuous loads, voltage drop, Michigan rules
Examination content map: 100 questions across five domains
NEC-Based Practice Examination 2
, MICHIGAN JOURNEYMAN TEST QUESTIONS - COMPLETE SOLUTIONS 2026/2027
Section 1: Conductors, Ampacity, and Conduit Fill
Q1. What is the minimum AWG size conductor required for a 70-amp load when there are six THHN
conductors in a raceway, all connected to a 75°C rated circuit breaker?
A. 6 AWG
B. 4 AWG [CORRECT]
C. 3 AWG
D. 2 AWG
Correct Answer: B
Rationale: Per NEC Table 310.16, 4 AWG THHN copper is rated 95 amps in the 90°C column. Because six
current-carrying conductors are installed in one raceway, the ampacity must be adjusted to 80 percent (NEC Table
310.15(B)(3)(a), shown as Table 310.15(C)(1) in the 2020/2023 NEC). The adjusted ampacity is 95 × 0.80 = 76
amps, which is sufficient for the 70-amp load. The 75°C termination check also passes, since 4 AWG at 75°C is
rated 85 amps (NEC 110.14(C)). Option A (6 AWG) fails because 75 × 0.80 = 60 amps is less than 70 amps.
Options C and D would work but are larger than the minimum, so they are not the correct minimum size.
Q2. Three 120/240V, 3-wire circuits of #10 TW conductors are installed in one 1-inch conduit. Each
circuit consists of two phase conductors, one grounded (neutral) conductor, and one equipment grounding
conductor. What is the maximum allowable ampacity per phase conductor after applying all required
correction and adjustment factors?
A. 18 amps
B. 21 amps
C. 24 amps [CORRECT]
D. 30 amps
Correct Answer: C
Rationale: The conduit contains 12 conductors total, but only 6 are current-carrying. The neutral of a 120/240V,
3-wire circuit carries only unbalanced current and is not counted (NEC 310.15(B)(5)(a)), and equipment grounding
conductors are never counted (NEC 310.15(B)(4)). With 4 through 6 current-carrying conductors, the adjustment
factor is 80 percent (NEC Table 310.15(B)(3)(a)). A #10 TW conductor is rated 30 amps at 60°C (Table 310.16), so
30 × 0.80 = 24 amps. Option D (30 amps) ignores derating, Option B (21 amps) wrongly applies the 70 percent
factor for 7-9 conductors, and Option A (18 amps) wrongly applies the 60 percent factor.
NEC-Based Practice Examination 3
