NEC Practice Questions by Article
The journeyman exam is an open-book race through the National Electrical Code. Drill the articles that carry the most questions — each page below has real exam-style sample questions, the tested subtopics, and a study plan for that article.
Article 110: General Requirements
31 questionsFree NEC Article 110 practice questions with answers and code references: working space clearances (110.26), terminal temperature ratings (110.14), and interrupting ratings.
Article 210: Branch Circuits
98 questionsFree NEC Article 210 practice questions with answers: GFCI requirements (210.8), AFCI protection (210.12), receptacle placement (210.52), and branch-circuit ratings.
Article 220: Load Calculations
69 questionsFree NEC Article 220 load calculation practice questions with worked answers: general lighting loads, demand factors, dwelling service calculations, and range/dryer demands.
Article 230: Services
46 questionsFree NEC Article 230 practice questions with answers: service disconnects, service-entrance conductors, clearances, and the rules for service equipment.
Article 240: Overcurrent Protection
36 questionsFree NEC Article 240 practice questions with answers: standard breaker sizes (240.6), small-conductor rule (240.4(D)), next-size-up rule, and feeder tap rules (240.21).
Article 250: Grounding and Bonding
49 questionsFree NEC Article 250 practice questions with answers: grounding electrode conductor sizing (Table 250.66), equipment grounding conductors (Table 250.122), and bonding rules.
Article 300: Wiring Methods
24 questionsFree NEC Article 300 practice questions with answers: minimum cover and burial depths (Table 300.5), protection from physical damage, and general wiring method rules.
Article 310: Conductors & Ampacity
83 questionsFree NEC Article 310 practice questions with answers: Table 310.16 ampacities, temperature correction, conduit fill adjustment factors, and conductor sizing.
Article 314: Boxes & Box Fill
21 questionsFree NEC Article 314 practice questions with answers: box fill calculations per 314.16, conductor volume allowances, and box support rules.
Article 430: Motors
61 questionsFree NEC Article 430 motor calculation practice questions with answers: FLC tables, branch-circuit conductor sizing (430.22), short-circuit protection (430.52), and overloads (430.32).
Article 450: Transformers
16 questionsFree NEC Article 450 practice questions with answers: transformer overcurrent protection (Table 450.3(B)), primary/secondary current calculations, and installation rules.
Article 680: Swimming Pools & Spas
18 questionsFree NEC Article 680 practice questions with answers: equipotential bonding (680.26), GFCI requirements, receptacle and luminaire clearances around pools.
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