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These 10 free MI-ME questions are organized by exam domain, so you can see how each part of the Michigan Master Electrician License Exam blueprint is tested. Reveal the answer and explanation under each question.
Domain 1: grounding and bonding
Question 1
The service disconnect and service panel at a Michigan one-family dwelling are being replaced. Utility service conductors supply the dwelling directly; no separate building disconnect arrangement applies. The design falls under Michigan Electrical Code Rules Part 8. Which location, function, and marking must the required emergency disconnect have?
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Correct answer: A - A readily accessible service disconnect on the dwelling exterior, marked "EMERGENCY DISCONNECT, SERVICE DISCONNECT".
Domain 2: overcurrent protection
Question 2
During troubleshooting of a 120/240 V multiwire branch circuit, a qualified electrician records 82 V from one ungrounded conductor to the shared neutral and 158 V from the other to that neutral. The voltage between the ungrounded conductors remains 240 V. Both line-to-neutral voltages at the supplying panel are approximately 120 V. The circuit is then isolated. These readings most strongly indicate:
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Correct answer: B - An open or high-resistance shared neutral.
Domain 3: wiring methods and installations
Question 3
An installation has two listed ground rods, each with 8 ft in contact with soil and spaced 8 ft apart. Their connections and grounding electrode conductor comply with the NEC, and no other qualifying electrodes are present. A proper earth-resistance test of the two-rod system measures 34 ohms. There is no additional project resistance specification. What further electrode work does the NEC require solely because of this reading?
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Correct answer: C - No additional electrode work is required.
Domain 4: boxes and cabinets
Question 4
A proposed industrial control panel is marked with a 5 kA short-circuit current rating (SCCR). Available fault current at its supply terminals is 18 kA. Its main circuit breaker has a 65 kA interrupting rating, but no evaluated arrangement establishes a higher panel SCCR. The supplier argues that the breaker makes the panel suitable. Which statement correctly evaluates that claim?
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Correct answer: D - The 5 kA panel SCCR is inadequate for this location.
Domain 5: services
Question 5
A 50 A nonmotor feeder has a calculated load of 48 A, all noncontinuous. Its 6 AWG copper THHN conductors run through a dry raceway containing six current-carrying conductors in a 38°C ambient. Both terminations are identified for 75°C conductors. Table 310.16 gives 65 A at 75°C and 75 A at 90°C. The conductor-count adjustment is 0.80; the ambient correction for the 90°C insulation is 0.91. The correct ampacity review is:
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Correct answer: B - 54.60 A; retain the proposed conductor size.
Domain 6: feeders
Question 6
For a dwelling served by a single 120/240 V, 3-wire, 200 A service, an electrician uses the 2023 NEC optional calculation. The general-load subtotal, excluding heating and cooling, is 26,000 VA before demand factors. Three separately controlled resistance-heating units total 12,000 VA; the cooling equipment is rated 6,800 VA. Controls prevent simultaneous heating and cooling. There is no heat pump or thermal-storage heating. What total calculated load belongs on the service-sizing worksheet?
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Correct answer: A - 24,200 VA
Domain 7: motors and motor controls
Question 7
A continuous-duty, 20 hp, 460 V, three-phase squirrel-cage motor has a nameplate current of 24 A, a service factor of 1.0, and a marked temperature rise of 35°C. NEC Table 430.250 lists 27 A for this motor rating. A separate overload device is being selected; no increased setting for starting or load-carrying difficulties is justified. What is the maximum permitted overload trip current?
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Correct answer: D - 30.00 A
Question 8
A conveyor starter has a momentary normally open START button, normally closed STOP and overload contacts in series with the coil, and a normally open holding contact across START. After a power interruption, the motor stays off when power returns. Pressing START makes it run and remain running after the button is released. How should the maintenance crew interpret this behavior?
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Correct answer: B - Normal operation; three-wire control requires a new START command after power loss.
Domain 8: special occupancies
Question 9
In a twelve-unit apartment building, a 50 A, 240 V electric range is supplied by a 120/240 V single-phase system. Its connection is being changed from cord-and-plug to permanent hardwiring. Under the 2023 NEC, how does removing the receptacle affect the GFCI requirement?
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Correct answer: A - GFCI protection remains required at the hardwired supply outlet.
Domain 9: load calculations
Question 10
Solvent vapor can reach ignitable concentrations during normal operation in a process area. The area documentation identifies a Group D vapor with an ignition temperature of 190°C. A replacement motor must be suitable for the location; all candidates satisfy the ambient-temperature requirement. Considering both location classification and maximum surface temperature, select the suitable marking:
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Correct answer: C - Class I, Division 1, Group D, T3A (180°C).