NETA Study Guide 2026
Everything you need to pass the NETA exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 NETA Exam Format at a Glance
📚 NETA Topics to Study (66)
✍️ Sample NETA Questions & Answers
1. When selecting arc-rated PPE using the incident energy analysis method, what is the correct relationship between PPE ATPV and calculated incident energy?
The selected PPE must have an ATPV or EBT rating equal to or greater than the calculated incident energy to provide adequate protection.
2. During a cable shield continuity test, which instrument is most appropriate?
A low-resistance ohmmeter measures the milliohm-level resistance of the metallic shield to verify it is continuous and properly bonded.
3. In transformer differential protection, what is the purpose of the harmonic restraint feature?
Inrush current during transformer energization contains high 2nd harmonic content, and harmonic restraint uses this to distinguish inrush from internal fault current.
4. During commissioning of a new automatic transfer switch (ATS), what test verifies that the switch will transfer load within the rated time on loss of normal source?
A simulated outage test removes normal source power and measures the elapsed time from source loss to completed transfer, verifying the ATS meets its specified transfer time.
5. When performing an acceptance test on a grounding electrode system, what instrument is most commonly used to measure soil resistivity?
The four-point Wenner method using an earth ground tester measures soil resistivity by injecting current between outer probes and measuring voltage between inner probes.
6. A technician is performing maintenance on a generator's protection panel and encounters a relay designated as 51V. What is the function of this protective device?
A 51V relay is a time-overcurrent relay (51) that includes a voltage restraint or voltage control feature (V). This is commonly used for generator backup protection. The voltage restraint feature allows the relay to be more sensitive to faults close to the generator, where the voltage drops significantly, while remaining secure against tripping on high load currents when the voltage is normal.