NETA ETT Level 2 case studies
NETA ETT Level 2 · Put your knowledge to work in context.
The NETA Electrical Testing Technician (ETT) credential is offered by the InterNational Electrical Testing Association (NETA), the trade association whose published site lists a Technician Certification Exam alongside exam preparation, exam reminders, and a practice exam under its Certification section. NETA also maintains the ANSI/NETA ETT standard, which appears among its ANSI/NETA standards family (including ATS, MTS, ECS, and EMW), indicating that the ETT designation is tied to a recognized standard for electrical testing technicians. The NETA ETT Level 2 case studies are 5 cases and about 4,105 words.
1Stale Arc Flash Label and a Racked Bucket
A 480 V, three-phase MCC in a food plant carries a label reading "Incident Energy 12.0 cal/cm² at 18 in; AFB 8 ft." The study behind it used a utility fault contribution of 22 kA. The utility has just issued a new available-fault letter: 34 kA at the service.
791 words, about 4 min2Starter Drops Out and a Phantom Voltage on the Run Light
A 480 V, 25 hp irrigation pump has a 120 V control circuit fed from a 500 VA control power transformer. The print shows: fuse → NC overload contact → NC STOP pushbutton → NO START pushbutton → starter coil, with a holding contact parallel to START.
856 words, about 4 min3Falling Polarization Index on a 4.16 kV Motor
A 4160 V, 1500 hp TEFC induction motor comes out of service for its annual shutdown. Leads are disconnected and grounded for 10 minutes.
796 words, about 4 min4Acceptance Testing a Relocated 1500 kVA Dry-Type Transformer
A 1500 kVA, 13.8 kV delta–480Y/277 V dry-type transformer is being acceptance tested after being moved from another plant. Nameplate ratio H-X is 28.75:1.
821 words, about 4 min5Steady Current on the Grounding Electrode Conductor
A 2000 A, 480Y/277 V double-ended switchboard is fed by two 1000 kVA transformers with a normally open tie. During a site survey, a clamp-on ammeter on the grounding electrode conductor at the main bonding jumper reads a steady 21 A.
841 words, about 4 min