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The CT-E2 exam has 80 questions and runs 3 hours 30 minutes.
These 10 free CT-E2 questions are organized by exam domain, so you can see how each part of the Connecticut E-2 Unlimited Electrical Journeyperson License Exam blueprint is tested. Reveal the answer and explanation under each question.
A 24 VDC relay will not pick up. Its coil requires at least 20 V. With the circuit commanded on, a qualified electrician measures 24 V at the power-supply terminals, 18 V across the coil, and 6 V across a closed series interlock contact. Voltage drops across the remaining wiring are negligible. Which fault does this evidence identify?
Correct answer: B - Excessive resistance at the closed interlock contact
A 240 V feeder supplies a 28 A process-heating load that runs at full current for four hours and a 9 A noncontinuous load that operates for ten minutes at a time. Both can operate simultaneously. The feeder breaker is not part of a listed 100%-rated assembly, and the conductors and equipment are suitable for every rating offered. Using NEC 2020, select the smallest standard breaker rating that meets the feeder load requirement.
Correct answer: C - 45 A
A new detached garage has a four-wire feeder and a grounding-electrode system. Its panel neutral bar is bonded to the enclosure. With ordinary loads running and no insulation fault present, current on the feeder equipment grounding conductor (EGC) rises and falls with the garage load. For this NEC 2020 installation, what correction removes the unintended normal-current path while preserving the required grounding connections?
Correct answer: D - Isolate the neutral bar; retain the feeder EGC and electrode bonds.
Three 240 V, two-wire circuits share a 40 ft EMT run with one wire-type equipment grounding conductor. Each circuit has two 6 AWG copper THWN-2 conductors; there are no neutrals. Ambient temperature is 30 °C, and all terminals are identified for 75 °C. NEC 2020 table ampacities are 65 A at 75 °C and 75 A at 90 °C. Adjustment factors are 80% for 4-6 current-carrying conductors and 70% for 7-9. What allowable ampacity applies to each ungrounded conductor after these checks?
Correct answer: C - 60.0 A
For an NEC 2020 box-fill check, three 12/2 cables with equipment grounds enter a two-gang box containing two switches on separate yokes. All six insulated cable conductors are spliced inside. Four insulated 12 AWG pigtails connect those splices to the switches and remain entirely within the box. There are internal cable clamps but no other fittings. The volume allowance for 12 AWG is 2.25 cubic inches. Which is the smallest marked box volume below that accommodates the installation?
Correct answer: B - 28 cubic inches
An installation area contains a Group D flammable vapor in ignitible concentrations during normal operation. The documented autoignition temperature is 180 °C. Considering the NEC 2020 class, division, group, and surface-temperature requirements, which equipment marking is suitable? All four units otherwise meet the electrical and environmental requirements.
Correct answer: C - Class I, Division 1, Group D; T4, maximum surface temperature 135 °C
At a service panel, a qualified electrician records 240 V from A to B, B to C, and C to A. Readings to the identified neutral are A-N: 120 V, B-N: 208 V, and C-N: 120 V. The readings remain stable as single-phase loads change. Which interpretation best fits the complete pattern?
Correct answer: A - A normal 240/120 V high-leg delta supply
The nameplate current of an ordinary continuous-duty, three-phase squirrel-cage motor is lower than the full-load current listed for its horsepower and voltage in NEC Table 430.250. The installation uses a separate overload relay. In applying NEC 2020, which pairing gives the correct current basis for branch-circuit conductor sizing and overload protection?
Correct answer: D - Conductors: table full-load current; overload relay: nameplate current.
A newly terminated 38 m, four-pair copper Ethernet link is unreliable. A basic continuity tester shows every pin connected to the same-numbered pin at the far end, with no opens or shorts. At both connectors, however, the green twisted pair occupies pins 3 and 4, and the blue twisted pair occupies pins 5 and 6. The orange and brown pairs are correctly terminated. What wiring defect has the continuity test missed?
Correct answer: A - A split-pair termination
During a rooftop PV rapid-shutdown test, controlled-conductor voltages fall within 18 seconds to no more than 24 V outside the array boundary and 68 V inside it, then remain at or below those values. Each value is the highest of the required conductor-to-conductor and conductor-to-ground readings in that region. The system uses the NEC 2020 voltage-limiting compliance option. What finding is supported by these results?
Correct answer: D - Both regions meet their voltage and response-time limits.
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