The Hardest Topics on the Electrician Exam
Which topics cost candidates the most points in practice diagnostics?
| State | NEC topic | Questions tracked | Miss rate |
|---|---|---|---|
| TX | Special Occupancies and Equipment | 25 | 64% |
| TX | Motors and Generators | 33 | 58% |
| TX | Electrical Feeders | 11 | 45% |
| TX | Wiring Methods and Materials | 35 | 43% |
| TX | Calculations, Theory, and Plans | 30 | 43% |
| TX | Branch Circuit Calculations and Conductors | 69 | 42% |
| TX | Electrical Services and Service Equipment | 62 | 37% |
| MI | Branch Circuit Calculations and Conductors | 9 | 33% |
| CA | Determination of electrical system requirements | 63 | 30% |
| TX | Control Devices and Disconnects | 17 | 29% |
What it tells you
- These topic-level miss rates come directly from complete diagnostic attempts; they are not predictions and do not claim to be official pass-rate data.
- Topic-level miss rates are computed from 46 completed diagnostics across all states where we have enough topic coverage.
Methodology
Aggregated from completed, anonymous JourneymanIQ diagnostic sessions. Each question contributes to a topic-level miss count inside the candidate's same state context. The percentages are calculated as incorrect-attempt ratio by topic.
Source: Anonymized JourneymanIQ completed diagnostic sessions. | Last updated 2026-08-07
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