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 WA-ME exam has 110 questions and runs 7 hours.
These 10 free WA-ME questions are organized by exam domain, so you can see how each part of the Washington Master Electrician Certificate Exam blueprint is tested. Reveal the answer and explanation under each question.
Lights on several 120 V circuits become unusually bright while lights on the opposite leg dim when an appliance starts. At the load end of a 120/240 V, three-wire feeder, a qualified electrician records 158 V from L1 to neutral, 82 V from L2 to neutral, and a steady 240 V from L1 to L2. The feeder is then de-energized. Which fault best accounts for this combination?
Correct answer: C - An open or high-resistance feeder neutral
Six 12/2 cables with equipment grounding conductors enter a metal junction box. All 12 insulated conductors are spliced inside; six bare 12 AWG equipment grounding conductors also enter. The box has internal cable clamps but no devices, support fittings, or long conductor loops. Using the 2020 NEC and 2.25 cubic inches per 12 AWG conductor allowance, what minimum box volume is required?
Correct answer: D - 32.625 cubic inches
For a new hospital patient-care space, an installer proposes PVC raceway with an insulated copper equipment grounding conductor for the receptacle branch circuit. All grounding terminals and metal boxes would be connected to that conductor. No exception to the ordinary patient-care-space grounding requirements applies. What is missing from this proposal under the 2020 NEC?
Correct answer: B - A qualifying metal raceway or cable-armor grounding path in addition to the insulated copper conductor
A listed air-conditioning unit is marked "Minimum circuit ampacity: 28.6 A" and "Maximum circuit breaker: 45 A." Its dedicated circuit uses 10 AWG copper THWN-2 conductors on identified 75°C terminals. The applicable conductor ampacity is 35 A; no correction or adjustment is required. A 45 A breaker is installed. Under the 2020 NEC, which finding is correct?
Correct answer: D - The 35 A conductors and 45 A breaker can comply with the equipment markings.
A one-family dwelling has a listed outdoor switch marked "EMERGENCY DISCONNECT, NOT SERVICE EQUIPMENT." It is installed ahead of the indoor main panel, which contains the first service disconnect. Under the 2020 NEC, how should the conductors between these two enclosures and the indoor main bonding jumper be treated?
Correct answer: C - They remain service conductors; the main bonding jumper belongs at the indoor service disconnect.
The hazardous-area documentation for a process vapor specifies Class I, Division 1, Group C and an ignition temperature of 190°C. Four enclosed control devices have suitable voltage ratings and are all rated for the stated 40°C ambient. Considering location, gas group, and surface temperature together, which marking is acceptable under the 2020 NEC?
Correct answer: D - Class I, Division 1, Groups C and D, T3A (180°C)
A maintenance employee holds only an active Washington 07C restricted nonresidential maintenance certificate. The employee is assigned to replace a failed 20 A branch-circuit breaker with the exact manufacturer-approved replacement, without changing its rating or location. The replacement qualifies as permit-exempt Class A basic electrical work. How should the assigned master handle the staffing decision?
Correct answer: A - Reassign the replacement to an electrician whose certification covers circuit-breaker work.
A Washington electrical contractor loses its designated master electrician when the master voluntarily resigns. The contractor license is otherwise current, the remaining installers are properly certified, and no suspension or stop-work order exists. Which statement correctly describes the effect of this ordinary departure?
Correct answer: A - The master must give written notice within 10 days; the contractor has 90 days to qualify a replacement.
Two first-year apprentices, both registered in approved Washington 01 programs and holding valid training certificates, will install a new commercial feeder outside the residential specialty scope. No school-program ratio exception or unsupervised-training authorization applies. Which on-site team permits both apprentices to perform this general electrical work at the same time?
Correct answer: B - Two 01 journey-level electricians, each providing the required supervision
A new dwelling will have one 120/240 V, three-wire service sized by the 2020 NEC optional dwelling method. Its correctly assembled general-load subtotal, before demand factors and excluding HVAC, is 34,000 VA. The central heat pump has a 5,000 VA compressor and 12,000 VA of supplemental electric heat; both can operate together. No other loads apply. Which listed service rating is the smallest that accommodates the calculated load?
Correct answer: B - 150 A
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