ICC E3 study guide
ICC E3 · Work through your exam, one topic at a time.
The ICC Electrical Plans Examiner (E3) credential is one of the International Code Council's certification exams for building safety professionals. It is intended for individuals who review electrical construction documents for code compliance rather than those who install or inspect wiring in the field, and it is commonly pursued by plan reviewers, code officials, and designers who work with electrical drawings. The ICC E3 study guide has 4 sections and about 1,537 words.
01Electrical Code and Plan Review Fundamentals
Plan review is about reading a drawing set the way an inspector will: finding the service, the panel schedules, the load calculations, the grounding details, and the notes that govern them. Candidates must know how the code is organized (articles, parts, tables, exceptions), how to apply the mandatory and permissive language, and how to trace a plan from the utility connection through the distribution equipment.
406 words, about 2 min02Branch Circuits, Feeders, and Service Calculations
This is the calculation heart of the exam. Candidates must be able to size branch circuits, feeders, and services using the standard method, and know when demand factors and optional methods apply.
406 words, about 2 min03Grounding, Bonding, and Overcurrent Protection
Grounding and bonding questions are the most concept-heavy on the exam. You must distinguish system grounding (connecting the source neutral to earth) from equipment grounding (providing a fault path) and from bonding (connecting metal parts together).
382 words, about 2 min04Special Occupancies, Equipment, and Plan Review Administrative Provisions
This domain covers the special-occupancy articles (hazardous locations, health care, assembly, dwelling units, and similar) and the administrative side of plan review: permits, inspections, and the responsibilities of the designer and the authority having jurisdiction (AHJ). Hazardous location classification: Class I (gases and vapors), Class II (dusts), Class III (fibers and flyings); divisions and zones describe the likelihood of hazard.
343 words, about 2 min