NETA ETT Level 4 study plan

Define the shock-hazard envelope for AC and DC systems by stating the body-current thresholds for perception, let-go, and ventricular fibrillation and the corresponding touch-voltage limits for dry, wet, and immersed skin.

Apply the NFPA 70E approach-boundary model by computing limited, restricted, and arc-flash boundaries for at least three sample tasks using incident-energy and shock tables you build yourself.

Explain the difference between a shock risk assessment and an arc-flash risk assessment, and list the PPE category selection inputs for each.

Trace how a phase-to-ground fault on a solidly grounded 480 V system differs in hazard profile from the same fault on a high-resistance-grounded system.

Sketch the single-line diagram of a typical industrial distribution system from utility service through main breaker, bus, and feeder breakers, labeling voltage levels and grounding type at each point.

Solve phasor problems for series and parallel RLC circuits at 60 Hz, computing impedance, current, phase angle, and power factor without a calculator shortcut sheet.

Convert among real, reactive, and apparent power for a three-phase load and verify the result using both line-to-line and line-to-neutral formulations.

Describe the construction and operating principle of the core power system equipment: power transformers, instrument transformers, breakers, and surge arresters, noting one failure mode for each.

Explain per-unit normalization and compute per-unit impedances for a two-transformer radial system on a common base.

Interpret a nameplate for a distribution transformer and a generator, extracting kVA, voltage ratio, impedance, temperature rise, and connection type.

Select the correct test voltage and duration for insulation resistance testing of transformers, cables, and motors per the applicable field-test standard, and justify each choice.

Explain how temperature, humidity, and surface contamination bias insulation resistance readings, and describe the guard-terminal technique that removes surface leakage.

Interpret polarization index and dielectric absorption ratio results, including when the test is invalid and must be repeated.

Sequence a transformer commissioning test program covering winding resistance, ratio, insulation resistance, power factor or capacitance, and excitation current, stating what each test detects.

Diagnose three fault signatures from transformer test data: turn-to-turn shorts, moisture ingress, and core grounding problems.

Describe the operating mechanism and arc-quenching method for air, vacuum, SF6, and oil breakers, and match each to its typical voltage class and application.

Interpret timing-test results, including contact bounce, pole discrepancy, and mechanism travel curves, and state the tolerance for each.

Explain CT ratio, burden, saturation, and accuracy class, and compute the secondary voltage required to saturate a given CT at a fault current.

Trace a protection scheme from CT through relay to trip coil, identifying where a wiring error would cause a false trip or a failure to trip.

Compare overcurrent, differential, and distance protection philosophies and state the application each serves best.

Select the correct field test for a cable based on insulation type and age, comparing insulation resistance, DC hi-potential, very-low-frequency, and partial-discharge testing.

Explain why DC testing is discouraged or prohibited for aged XLPE cable and what diagnostic alternative applies.

Interpret time-domain reflectometry traces to locate a cable fault and distinguish an open from a short.

Plan a rotating-machinery test sequence covering insulation resistance, winding resistance, surge comparison, and vibration, and state the acceptance criteria for each.

Diagnose bearing failure, rotor bar problems, and winding insulation degradation from test and signature data.

Compute ground electrode resistance for rod, grid, and plate configurations and explain how soil resistivity and seasonal moisture change the result.

Compare solidly grounded, low-resistance, and high-resistance grounding for continuity of service, fault detection, and personnel safety.

Explain the operation of a ground-fault circuit interrupter and a ground-fault protection relay, and state the trip thresholds and time delays typical for each.

Diagnose power-quality problems from waveform evidence: harmonics, voltage sags, transients, and neutral overload from triplen harmonics.

Revisit your week-one hazard sheet and revise any boundary or PPE conclusion that grounding practice changes.

Build a 60-question mixed practice exam weighted to the published domain percentages and take it under timed conditions.

Score the practice exam by domain and rank your three weakest areas by percentage, not by count.

Re-study each weak area using your own week notes and rework every missed question to a correct final answer with a written justification.

List the formulas, thresholds, and standard clause numbers you still cannot recall from memory and drill them.

Re-take a fresh 60-question mixed exam and compare domain scores against week seven to confirm improvement in every weak area.

Deliver a five-minute verbal walkthrough of a substation commissioning sequence, from safety planning through relay verification to energization.

Review every formula and threshold on your drill list and confirm recall without notes.

Practice the exam interface and question pacing so that no item is left unanswered for time reasons.