California General Electrician Study Guide (2026 Edition)
A topic-by-topic study guide for the California DIR General Electrician exam. The 2022 first-time pass rate was 52.95%; the repeat rate dropped to 38.02%. The exam is open-book but the materials are typically provided at the test center, which means you can't rely on a tabbed personal codebook.
Last reviewed May 2026
What the exam tests
The California General Electrician exam draws from the 2025 CEC (which uses NEC 2023 as the baseline plus California amendments). 100 questions, 4 hours 30 minutes, 70% to pass. The official outline weights four domains:
- Installation, 66%. The biggest section by far. Branch circuits, services, feeders, motors, grounding, raceways, conductors, lighting, equipment.
- Determination of electrical system requirements, 22%. Calculations and load determination. Service load, feeder ampacity, motor branch circuits, dwelling unit calcs.
- Safety, 6%. Personal protection, lockout/tagout, OSHA basics, working space requirements.
- Maintenance and repair, 6%. Troubleshooting, replacement, retrofit considerations.
How much time each topic deserves
The Installation section alone is two-thirds of the exam. Don’t burn equal time across all four domains. Proportional weight wins.
Installation cluster (≈66%)
- Articles 210, 215, 220: branch circuits, feeders, calculations.
- Article 230: services and service equipment.
- Article 250: grounding and bonding (high-confusion area).
- Article 300 series: wiring methods.
- Article 310: conductors and ampacities.
- Article 314: boxes and conduit bodies.
- Articles 404, 406, 408: switches, receptacles, panelboards.
- Articles 422, 424: appliances and fixed heating.
- Article 430: motors.
- Article 440: air-conditioning and refrigeration.
- Articles 600, 680, 690, 700: signs, pools, PV, emergency.
- Article 760: fire alarm cable.
Calculations cluster (≈22%)
Daily reps. Voltage drop, conduit fill, box fill, motor sizing, dwelling unit load, service load, transformer sizing. By exam day you should be able to set up any of these without looking at the formula sheet.
The CEC vs NEC overlay
The 2025 California Electrical Code is built on NEC 2023 with California-specific amendments. Generic NEC prep that doesn’t account for the CEC overlay will trip you on a handful of questions. Common amendment areas:
- Title 24 energy code overlays (lighting controls, EV charging).
- Article 690/705 PV requirements (California has aggressive solar code).
- Seismic bracing for service equipment in some occupancies.
- Specific listing requirements that differ from NEC defaults.
A 30-day allocation
Days 1-7: codebook speed (no tabs)
Train index navigation. The official DIR FAQ indicates exam books may be provided without your personal tabs. Index recall is the real skill. Drill: 100 random article lookups per day, target 30 seconds each.
Days 8-15: calculations
Voltage drop, conduit fill, box fill, motor FLA, dwelling load, service load, transformers. Two new types per day. Yesterday’s type as 10-minute warm-up.
Days 16-22: weak topics + grounding
Article 250 deserves three days alone. The grounding electrode conductor / equipment bonding jumper / supply-side bonding jumper split is where most candidates lose easy points.
Days 23-30: full mocks + cleanup
Two full 100-question timed mocks. Score them. Fix what you missed. Last 2 days: light review, sleep, hydrate, show up.
See where you stand on the California exam
Take the California-specific diagnostic. 90 seconds. Tells you which CEC domains will lose you points if you walked in this week.