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The ME-ME exam has 100 questions and runs 4 hours.
These 10 free ME-ME questions are organized by exam domain, so you can see how each part of the Maine Master Electrician License Exam blueprint is tested. Reveal the answer and explanation under each question.
During a service call, lights on one leg of a home's 120/240 V system brighten as lights on the other leg dim. With unequal 120 V loads connected, a qualified electrician measures 168 V from L1 to neutral, 72 V from L2 to neutral, and 240 V from L1 to L2 at the service panel. Which defect best explains this pattern?
Correct answer: C - An open or high-resistance service neutral
A qualified electrician has isolated and locked out a 480 V motor control center. An adequately rated contact tester indicates voltage on a known live source, then indicates zero on every required phase-to-phase and phase-to-ground check at the work location. On the final check against the known live source, the tester also indicates zero. Work on the conductors has not begun. What is the next appropriate action?
Correct answer: D - Keep the equipment isolated; repeat the full verification with a working tester checked before and after use.
A new copper communications run passes vertically between floors in a riser shaft, then crosses a ceiling cavity used as an environmental-air return plenum. The riser shaft is not fireproof, and neither portion of cable is enclosed in a raceway. All proposed cables meet the signal-performance requirements. Which cable-rating assignment is suitable for both portions?
Correct answer: B - CMR in the riser; CMP in the plenum
A listed 240 V air-conditioning unit is marked 'Minimum Circuit Ampacity: 28 A' and 'Maximum Circuit Breaker: 40 A.' It contains the required motor overload protection. The proposed circuit has 10 AWG copper conductors with 35 A allowable ampacity under the installation conditions and a 40 A breaker. A reviewer objects that 10 AWG copper must always have a breaker rated 30 A or less. What response is warranted?
Correct answer: A - Accept the proposed conductor-and-breaker combination under Article 440.
A 45-pound ceiling-suspended paddle fan is to be supported solely by an outlet box. The existing box is marked for a 50-pound luminaire, but its listing does not include fan support. The joist is accessible, and a suitable replacement box can be installed. Which support specification meets the NEC requirement?
Correct answer: A - A fan-support-listed box marked for a fan weight of at least 45 pounds
A continuous-duty, general-purpose 10 hp, 460 V, three-phase motor has a nameplate current of 12.0 A, a service factor of 1.0, and a marked temperature rise of 35°C. Its NEC table full-load current is 14 A. The electrician is selecting a separate overload device, not the branch-circuit short-circuit protective device. Before any allowance for increasing the setting to carry the load, what is the maximum permitted overload trip-current rating?
Correct answer: B - 15.0 A
For a project using NEC 2023, an installer proposes using reduced EVSE ratings in the service calculation rather than upgrading the service for the unreduced nameplates. The listed EVSE permits reduced ratings under its manufacturer's instructions, but the installer has only lowered the charging current in a customer-accessible phone app; the rating labels are unchanged. What must change before the reduced ratings can be used under the adjustable-setting provision?
Correct answer: D - Restrict ampere adjustment to qualified personnel and durably update the rating labels.
A new detached workshop is supplied by a four-wire, 120/240 V feeder: two ungrounded conductors, a neutral, and an equipment grounding conductor. The workshop also has its required grounding electrode system. In its panel, the equipment grounding bar is bonded to the enclosure, but the installer has also installed the neutral bonding screw. Before energization, how should this panel be corrected?
Correct answer: D - Remove the neutral bonding screw; retain the equipment-grounding and electrode connections.
An industrial feeder supplies a 53 A noncontinuous load. Its copper THHN/THWN-2 conductors share a 50-foot raceway with eight current-carrying conductors total, at 43°C ambient. All terminals are identified for 75°C. The applicable conductor-count factor is 0.70, and the 90°C ambient correction factor is 0.87. Table 310.16 ampacities at 75°C/90°C are: 8 AWG, 50/55 A; 6 AWG, 65/75 A; 4 AWG, 85/95 A; and 3 AWG, 100/115 A. Select the smallest conductor that satisfies the ampacity requirements.
Correct answer: C - 4 AWG copper
An underground PVC feeder raceway has properly solvent-welded joints and sealed entries. During inspection, the installed conductors are found to be marked only THHN, with no wet-location designation. Which inspection finding is correct?
Correct answer: A - The conductors need a wet-location rating, such as THWN-2.
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