10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The KY-ME exam has 100 questions and runs 5 hours.
These 10 free KY-ME questions are organized by exam domain, so you can see how each part of the Kentucky Master Electrician License Exam blueprint is tested. Reveal the answer and explanation under each question.
Voltage readings at a shop's three-phase, four-wire service are 240 V between every pair of phases, 120 V from A to neutral, 208 V from B to neutral, and 120 V from C to neutral. The readings remain steady as the existing loads change. A new 120 V control circuit is being planned. What do these findings establish?
Correct answer: C - This is a high-leg delta supply; use A-to-neutral or C-to-neutral for the 120 V circuit.
A service has two listed ground rods, each with 8 ft of earth contact, spaced 8 ft apart and properly bonded together. There are no other qualifying electrodes at the building. A valid test reports 38 ohms for the completed electrode system. The foreman wants to keep adding rods until the reading falls below 25 ohms. Under the NEC electrode rule, what is required?
Correct answer: D - No additional rod is required solely because the two-rod system measures 38 ohms.
Enter the standard-method demand for the general-load portion of this dwelling's service calculation: 2,400 square feet of applicable floor area, 36 general-use duplex receptacles, two required small-appliance branch circuits, and one required laundry branch circuit. Include lighting, general-use receptacles, and the small-appliance and laundry allowances only. What value belongs on the load worksheet?
Correct answer: A - 6,045 VA
A new dwelling kitchen has a dedicated 120 V, 20 A circuit for a refrigerator. Its receptacle is 10 ft from the sink and does not serve a countertop. The plans are being reviewed under the 2023 NEC. Which protection does this circuit require?
Correct answer: A - Both GFCI and AFCI protection, despite the dedicated circuit and distance from the sink.
A metal switch box will contain seven insulated 12 AWG copper conductors that enter and terminate or splice, three 12 AWG equipment grounding conductors entering with the cables, internal cable clamps, and one ordinary switch on a single yoke. All pigtails remain entirely within the box, and no other fittings require a volume allowance. The minimum box volume under 314.16 is:
Correct answer: B - 24.75 cubic inches
Before conductors are pulled into an underground PVC feeder raceway, the electrician discovers that the wire is marked THHN only, with no additional wet-location rating. The installer argues that glued PVC joints will keep the conductors dry. Which revision addresses the actual code issue?
Correct answer: C - Use wet-location-rated conductors, such as THWN-2, throughout the underground raceway.
An air-conditioning unit is marked 'Minimum Circuit Ampacity: 28 A' and 'Maximum Circuit Breaker: 45 A.' The installation uses 10 AWG copper conductors with a final allowable ampacity of 35 A and a 45 A breaker. The listed unit provides the required overload protection, and all terminals are identified for 75°C conductors. Does the conductor-breaker combination require correction?
Correct answer: D - No; the conductors satisfy MCA, and the breaker is within the marked limit.
A conveyor uses conventional three-wire control: normally closed STOP and overload contacts are in series with the contactor coil, and a normally open auxiliary contact is wired across the momentary START button. The motor runs normally while START is held, but the contactor drops out immediately when START is released. Which fault best fits this behavior?
Correct answer: B - An open auxiliary seal-in contact or its parallel wiring.
The submittal for a 15 hp, 460 V, three-phase continuous-duty motor lists a nameplate current of 18.6 A, a service factor of 1.10, and a temperature rise of 35°C. NEC Table 430.250 gives 21 A for this motor rating. No increased setting for starting or carrying the load is needed. What maximum current may be used when selecting the separate overload protection under 430.32(A)(1)?
Correct answer: B - 23.25 A
A permanently installed swimming pool remains closed after a reported shock. During the investigation, the electrician verifies the pump's equipment-grounding path and GFCI operation, but finds that a metal ladder is isolated from the pool's equipotential bonding network. Regardless of any other repairs, which correction must be included before the pool returns to service?
Correct answer: A - Bond the ladder to the pool's equipotential bonding network.
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