NEC Architecture study guide
NEC Architecture · Work through your exam, one topic at a time.
The NEC Architecture exam is a code-application credential for electricians, electrical engineers, plan reviewers, inspectors, and contractors who need to demonstrate working command of the National Electrical Code as an architectural and design reference. Unlike a memorization test, it is built around scenario-based multiple-choice items that ask you to locate the governing article, apply it to a described installation, and choose the compliant answer. The NEC Architecture study guide has 10 sections and about 3,064 words.
01General Requirements and Administration
The NEC is organized so that general rules come first and specific rules modify them later. A candidate must understand Article 90 (scope and purpose) and Article 100 (definitions), because many questions turn on precise wording rather than intuition.
323 words, about 2 min02Wiring and Protection
This domain covers Chapter 2: Article 200 (grounded conductors), 210 (branch circuits), 215 (feeders), 220 (calculations), 225 (outside branch circuits and feeders), 230 (services), 240 (overcurrent protection), 250 (grounding and bonding), 280/285 (surge protection), and 300 (general wiring methods). grounding conductors: the grounded (neutral) conductor carries current; the equipment grounding conductor does not except during a fault.
328 words, about 2 min03Wiring Methods and Materials
Chapter 3 governs wiring methods: Articles 300 (general), 310 (conductors), 320-340 (raceways and cable), 350-362 (flexible and specialty raceways), 376-392 (wireways, busways, cable trays), and 394-398 (open wiring, outside conductors). Conductor ampacity: use Article 310 tables, apply correction factors for ambient temperature and adjustment factors for conductor count in a raceway.
312 words, about 2 min04Equipment for General Use
Chapter 4 covers flexible cords and cables (400), fixtures and lampholders (410), receptacles and switches (404, 406), switchboards and panelboards (408), industrial controls (409), motors (430), air conditioning (440), generators (445), transformers (450), capacitors (460), storage batteries (480), and appliances (422). Flexible cords: permitted uses and prohibited uses (no substitutes for fixed wiring, no running through walls or ceilings).
304 words, about 2 min05Special Occupancies
Chapter 5 modifies Chapters 1-4 for specific occupancies: assembly (518), theaters (520), motion picture studios (530), places of assembly and similar (540), hazardous locations (500-517), health care facilities (517), agricultural buildings (547), mobile homes (550), recreational vehicles (551), marinas (555), and similar. Hazardous locations (Articles 500-506): classification by Class, Division/Zone, and Group; understand the difference between Class I (gases/vapors), Class II (dusts), and Class III (fibers/flyings).
327 words, about 2 min06Special Equipment
Chapter 6 covers special equipment: elevators (620), hoists and cranes (610), electric signs (600), welders (630), data processing (645), fire pumps (695), swimming pools (680), solar photovoltaic (690), fuel cells (692), wind (694), energy storage (706), and similar. Elevators (620): disconnects, feeder and branch-circuit requirements, and traveling cable rules.
286 words, about 1 min07Special Conditions
Chapter 7 addresses special conditions: emergency systems (700), legally required standby (701), optional standby (702), critical operations power systems (708), fire alarm (760), and similar. These articles focus on reliability, separation, and survivability.
300 words, about 2 min08Communications Systems
Chapter 8 covers communications systems: Article 800 (general), 810 (radio and television), 820 (network-powered broadband), 830 (network-powered broadband communications), 840 (premises-powered broadband), and related articles. These rules govern cabling, grounding, bonding, and protection.
298 words, about 1 min09Tables and Annexes
Tables are where many exam questions are won or lost. Key tables include Chapter 9 tables (conduit fill, conductor dimensions), Table 310.16 (ampacities), Table 250.122 (equipment grounding conductor sizing), Table 430.250 (motor full-load currents), and Table 220.42/220.55 (demand factors).
290 words, about 1 min10Plan Review and Code Application
Plan review questions test whether you can apply the code to a described installation rather than recall a single number. Approach each scenario methodically: identify the occupancy and location, identify the equipment, then identify the applicable article and any modifying article.
296 words, about 1 min