Study lab
Train the open-book reflex.
The exam allows your code book — it scores how fast you can use it. Drill the lookup, the math, and the vocabulary here. Free, no account, NEC 2026 aware.
3-phase fused disconnect: pulled apart
Full 3D teardown · back-feed trap · NEC 2026 300.6(G)
CC · Captions in 10 languages. Use the player's CC button to switch language or turn them off.
Practice questions are written and presented in English, matching how the item bank is authored. The interface, narration, and study guides are translated.