Free WA-JE Practice Questions

Question 1

Recorded readings on a 120/240 V multiwire branch circuit show 120 V from each ungrounded conductor to neutral at the panel. At the connected loads, the readings are 158 V on one leg and 82 V on the other; line-to-line voltage remains 240 V. The two load voltages shift in opposite directions as appliances cycle. Which fault best explains this pattern?

Accepted Answer

An open or high-resistance shared neutral between the panel and the connected loads.

Answer

Excessive resistance in one ungrounded conductor between the panel and the connected loads.

Answer

Both ungrounded branch-circuit conductors connected to the same leg of the panel's supply.

Answer

A sustained increase in the utility's line-to-line voltage supplying the entire panel.

Question 2

A 70 ft raceway contains three 240 V, two-wire circuits and one wire-type equipment grounding conductor. The six circuit conductors are 6 AWG copper THHN/THWN-2, and all terminals are rated 75°C. Ambient temperature is 38°C. Table ampacities are 65 A at 75°C and 75 A at 90°C. The ambient correction factor for 90°C insulation is 0.91; conductor-count adjustment factors are 80% for 4-6 current-carrying conductors and 70% for 7-9. What is the greatest allowable conductor ampacity under these conditions?

Accepted Answer

54.6 A

Answer

47.8 A

Answer

60.0 A

Answer

65.0 A

Question 3

Today's crew for new 480Y/277 V factory distribution consists of one certified Washington general journey level (01) electrician, two registered apprentices holding valid electrical training certificates, and the contractor's electrical administrator. The administrator has no electrician certificate, and no school-program ratio exception applies. What staffing change is needed for both apprentices to perform this general electrical work at the same time?

Accepted Answer

Add a second certified journey level or master journey level electrician to meet the one-to-one supervision ratio.

Answer

Have the administrator directly supervise one apprentice while the 01 electrician supervises the other.

Answer

Schedule both apprentices together provided the 01 electrician is present for 75% of each working day.

Answer

Assign the 01 electrician exclusively to supervision instead of allowing that electrician to install wiring.

Question 4

An air-conditioning unit is marked 'Minimum Circuit Ampacity 28 A' and 'Maximum Fuse or Circuit Breaker 45 A.' Its proposed supply uses 10 AWG copper THHN/THWN-2 on 75°C terminals and a 40 A circuit breaker. The usable conductor ampacity is 35 A, no correction or adjustment is needed, and the breaker carries normal starting current. Under the 2020 NEC, how should this combination be judged?

Accepted Answer

Accept it; 35 A satisfies MCA and 40 A is below the marked overcurrent maximum.

Answer

Reject it; the ordinary 30 A small-conductor limit governs this compressor circuit's breaker selection.

Answer

Reject it; the conductors must have at least 45 A ampacity to match the nameplate maximum.

Answer

Reject it; the breaker must be increased to 45 A to use the equipment's nameplate rating.

Question 5

A newly installed four-wire feeder supplies a detached workshop. At the workshop panel, the neutral bar is bonded to the enclosure; the feeder equipment grounding conductor (EGC) and local grounding electrode conductor are connected to the enclosure's grounding bar. A clamp meter detects current on the feeder EGC that rises as 120 V workshop loads are switched on. With the system safely deenergized for repair, which change removes the unintended neutral-current path while preserving required grounding?

Accepted Answer

Isolate the neutral bar from the enclosure; retain the feeder EGC and the local grounding electrode connections.

Answer

Disconnect the feeder EGC and retain the neutral bond and the local grounding electrode connection.

Answer

Remove the grounding electrode conductor and leave both the feeder EGC and neutral bond unchanged.

Answer

Increase the feeder EGC size while keeping the existing neutral-to-enclosure bond and electrode connection.

Question 6

Two 20 A single-pole breakers on opposite legs supply a 120/240 V multiwire branch circuit. Every load is connected line to neutral; no load uses both ungrounded conductors. The breakers have no handle tie. All other branch-circuit requirements are satisfied. What is the least change that provides the required simultaneous disconnection under the 2020 NEC?

Accepted Answer

Add an identified handle tie suitable for the two installed breakers.

Answer

Move the existing breakers to adjacent panel spaces without linking their operating handles.

Answer

Cross-label the two breakers and require workers to open each breaker individually.

Answer

Install a common-trip breaker; an identified handle tie cannot satisfy this requirement.

Question 7

Equipment is being selected for a location documented as Class I, Division 2, Group D. The vapor's autoignition temperature is 190°C. All candidates suit the site's ambient temperature. Which nameplate matches both the location classification and the temperature limitation?

Accepted Answer

Class I, Division 2, Group D; T3A, maximum surface temperature 180°C.

Answer

Class I, Division 2, Group D; T3, maximum surface temperature 200°C.

Answer

Class II, Division 2, Group G; T4, maximum surface temperature 135°C.

Answer

Class I, Division 1, Group D; T2D, maximum surface temperature 215°C.

Question 8

During a design review, an engineer flags an ordinary branch circuit with 3.8% voltage drop and cites the NEC informational note recommending 3%. The load will receive voltage within its specified operating range. No special-occupancy voltage-drop requirement, local amendment, or tighter project specification applies. How should the electrician characterize the note's effect?

Accepted Answer

It provides design guidance but does not, by itself, establish an enforceable violation.

Answer

It prohibits energizing the circuit until the calculated branch-circuit voltage drop is 3% or less.

Answer

It permits 3.8% only after the authority having jurisdiction grants a special exception for the installation.

Answer

It makes 3.8% compliant only if the branch circuit's connected load is classified as noncontinuous.

Question 9

Review four service designs under 2020 NEC 230.95. Each has a single service disconnect and supplies ordinary commercial loads; no exception to that section applies. Which design requires service ground-fault protection of equipment?

Accepted Answer

480Y/277 V, solidly grounded wye; 1,200 A disconnect.

Answer

208Y/120 V, solidly grounded wye; 1,200 A disconnect.

Answer

480Y/277 V, solidly grounded wye; 800 A disconnect.

Answer

240 V, corner-grounded delta; 1,200 A disconnect.

Question 10

A junction box will contain six 12/2-with-ground cables, one duplex receptacle on a single yoke, and internal cable clamps. Every insulated conductor enters and is spliced or terminated in the box; all six equipment grounding conductors also enter. All conductors are 12 AWG, and any pigtails stay entirely inside. The volume allowance for 12 AWG is 2.25 in³. Using the 2020 NEC box-fill rules, select the smallest listed box volume that accommodates this assembly.

Accepted Answer

38.0 in³

Answer

34.0 in³

Answer

36.0 in³

Answer

48.0 in³

Free WA-JE Practice Questions

Domain 1: NEC 90 - Introduction

Question 1

Domain 3: NEC 200-225, 280-285 - Wiring & Protection

Question 2

Domain 4: NEC 230 - Services

Question 3

Domain 6: NEC 250 - Grounding & Bonding

Question 4

Domain 7: NEC 300-398 - Wiring Methods

Question 5

Question 6

Domain 9: NEC 430-450 - Motors, HVAC, Generators & Transformers

Question 7

Domain 11: NEC 500-516 - Hazardous Locations

Question 8

Domain 17: Washington Laws & Rules (RCW & WAC)

Question 9

Domain 18: General Trade Knowledge & Theory

Question 10

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