Michigan Master Electrician Licensing Exam Questions With
Correct Answers
Page 1 of 172
,Question 1
What percent of a motors FLC, is multiplied to detrmine the motors minimum conductor ampacity? 430.22
Correct Answer
125%
1: According to the Michigan Electrical Code, what is the minimum size copper grounding electrode conductor required
for a service with three parallel 500 kcmil copper service entrance conductors?
A. 1/0 AWG
B. 2/0 AWG
C. 3/0 AWG
D. 4/0 AWG
CORRECT ANSWER: B. 2/0 AWG
RATIONALE: Per NEC Table 250.66, the grounding electrode conductor (GEC) is sized based on the largest ungrounded
service conductor. Three parallel 500 kcmil conductors total 1,500 kcmil. Table 250.66 requires 2/0 AWG copper for
conductors over 1,100 kcmil up to 1,750 kcmil. Michigan follows NEC Table 250.66 without modification for this
application.
2: Michigan Electrical Code amendments require AFCI protection for which additional locations beyond base NEC
requirements?
A. All 120V, 15/20A receptacle circuits in dwelling unit kitchens
B. All 120V, 15/20A branch circuits supplying outlets in dwelling unit bedrooms, living rooms, and hallways
C. All 240V appliance circuits in single-family dwellings
Page 2 of 172
,D. All outdoor lighting circuits
CORRECT ANSWER: B. All 120V, 15/20A branch circuits supplying outlets in dwelling unit bedrooms, living rooms, and
hallways
RATIONALE: Michigan has historically expanded AFCI requirements to cover more dwelling areas than the base NEC.
While NEC 210.12 requires AFCI for most dwelling unit branch circuits, MI amendments explicitly mandate AFCI
protection for bedrooms, living rooms, hallways, and other habitable areas to reduce fire risk from arcing faults.
3: What is the maximum allowable voltage drop for branch circuits per Michigan Electrical Code recommendations?
A. 2%
B. 3%
C. 5%
D. 8%
CORRECT ANSWER: B. 3%
RATIONALE: While not always enforceable as a hard code violation, MI Electrical Code and NEC 210.19(A)(1)
Informational Note No. 4 recommend a maximum 3% voltage drop for branch circuits and 5% total for feeder + branch
combined. Michigan inspectors commonly enforce the 3% branch limit as a best practice for equipment performance and
safety.
4: For a 480Y/277V, 3-phase, 4-wire service, what is the required minimum size copper main bonding jumper for a 200A
service disconnect?
A. 4 AWG
Page 3 of 172
, B. 2 AWG
C. 1/0 AWG
D. 4/0 AWG
CORRECT ANSWER: B. 2 AWG
RATIONALE: Per NEC Table 250.102(C)(1), the main bonding jumper size is based on the largest ungrounded service
conductor. For a 200A service using typical 3/0 AWG copper conductors, Table 250.102(C)(1) requires a 2 AWG copper
bonding jumper. Michigan adopts this table without amendment.
5: Michigan requires all residential garage receptacles to be GFCI-protected at what maximum rating?
A. 15A, 125V only
B. 20A, 125V only
C. 15A and 20A, 125V
D. All 120V and 240V receptacles
CORRECT ANSWER: C. 15A and 20A, 125V
RATIONALE: NEC 210.8(A)(2) and MI amendments require GFCI protection for all 125V, 15A and 20A receptacles in
garages. Michigan explicitly enforces this for both 15A and 20A outlets to prevent shock hazards in damp, grounded
environments.
6: What is the maximum number of current-carrying conductors allowed in a single raceway before derating applies?
A. 3
Page 4 of 172
Correct Answers
Page 1 of 172
,Question 1
What percent of a motors FLC, is multiplied to detrmine the motors minimum conductor ampacity? 430.22
Correct Answer
125%
1: According to the Michigan Electrical Code, what is the minimum size copper grounding electrode conductor required
for a service with three parallel 500 kcmil copper service entrance conductors?
A. 1/0 AWG
B. 2/0 AWG
C. 3/0 AWG
D. 4/0 AWG
CORRECT ANSWER: B. 2/0 AWG
RATIONALE: Per NEC Table 250.66, the grounding electrode conductor (GEC) is sized based on the largest ungrounded
service conductor. Three parallel 500 kcmil conductors total 1,500 kcmil. Table 250.66 requires 2/0 AWG copper for
conductors over 1,100 kcmil up to 1,750 kcmil. Michigan follows NEC Table 250.66 without modification for this
application.
2: Michigan Electrical Code amendments require AFCI protection for which additional locations beyond base NEC
requirements?
A. All 120V, 15/20A receptacle circuits in dwelling unit kitchens
B. All 120V, 15/20A branch circuits supplying outlets in dwelling unit bedrooms, living rooms, and hallways
C. All 240V appliance circuits in single-family dwellings
Page 2 of 172
,D. All outdoor lighting circuits
CORRECT ANSWER: B. All 120V, 15/20A branch circuits supplying outlets in dwelling unit bedrooms, living rooms, and
hallways
RATIONALE: Michigan has historically expanded AFCI requirements to cover more dwelling areas than the base NEC.
While NEC 210.12 requires AFCI for most dwelling unit branch circuits, MI amendments explicitly mandate AFCI
protection for bedrooms, living rooms, hallways, and other habitable areas to reduce fire risk from arcing faults.
3: What is the maximum allowable voltage drop for branch circuits per Michigan Electrical Code recommendations?
A. 2%
B. 3%
C. 5%
D. 8%
CORRECT ANSWER: B. 3%
RATIONALE: While not always enforceable as a hard code violation, MI Electrical Code and NEC 210.19(A)(1)
Informational Note No. 4 recommend a maximum 3% voltage drop for branch circuits and 5% total for feeder + branch
combined. Michigan inspectors commonly enforce the 3% branch limit as a best practice for equipment performance and
safety.
4: For a 480Y/277V, 3-phase, 4-wire service, what is the required minimum size copper main bonding jumper for a 200A
service disconnect?
A. 4 AWG
Page 3 of 172
, B. 2 AWG
C. 1/0 AWG
D. 4/0 AWG
CORRECT ANSWER: B. 2 AWG
RATIONALE: Per NEC Table 250.102(C)(1), the main bonding jumper size is based on the largest ungrounded service
conductor. For a 200A service using typical 3/0 AWG copper conductors, Table 250.102(C)(1) requires a 2 AWG copper
bonding jumper. Michigan adopts this table without amendment.
5: Michigan requires all residential garage receptacles to be GFCI-protected at what maximum rating?
A. 15A, 125V only
B. 20A, 125V only
C. 15A and 20A, 125V
D. All 120V and 240V receptacles
CORRECT ANSWER: C. 15A and 20A, 125V
RATIONALE: NEC 210.8(A)(2) and MI amendments require GFCI protection for all 125V, 15A and 20A receptacles in
garages. Michigan explicitly enforces this for both 15A and 20A outlets to prevent shock hazards in damp, grounded
environments.
6: What is the maximum number of current-carrying conductors allowed in a single raceway before derating applies?
A. 3
Page 4 of 172
