Residential Wiring
Conductor sizing, overcurrent protection, and dwelling load calculations — the material behind the residential portion of a journeyman exam (NEC 2023 reference layer).
What to expect
Open book in real licensing exams — speed of code navigation is the skill being tested.
Expect table lookups: ampacity, conductor properties, demand factors.
Load-calculation questions chain several steps; partial setups earn nothing.
Pass mark: 70% — typical for state journeyman residential sections.
How to study
→ Tab your code book by chapter before exam day; the clock beats anyone who reads linearly.
→ Memorize the residential trio anyway: 14 AWG→15 A, 12 AWG→20 A, 10 AWG→30 A — faster than any lookup.
→ Write load calcs vertically, one line per step, exactly like the Formula Lab shows its work.
Units in this certificate
Conductor sizing and ampacity
Breakers, GFCI, and AFCI protection
Branch circuits and dwelling load basics
Boxes, box fill, and conductor counting
Grounding and bonding
Receptacle placement and required circuits
Cable types and wiring methods
Service equipment, panels, and clearances
Practice exam
Each attempt draws 30 questions at random from the 44-question bank, so no two sittings are the same. Unanswered questions score zero, and the exam auto-submits when the clock runs out — just like the real thing. That works out to about 90 seconds per question.