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Drill NEC quizzes, run 52 code-accurate calculators, and log your apprentice hours. Every answer cites the 2026 article and the 2023 article it replaced, so it holds whichever edition your AHJ enforces.
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NEC 2026
48 A
6 AWG Cu
180 ft
240 V, 1Ø
5.8 V drop · within 3%
Ch. 9 Table 9
Drill the code until the answer is reflex.
Practice sets by article, by state and by exam type. Every answer explains itself with the code reference, so you learn the book while you drill instead of memorising a key.
NEC 2026 §430.52
A 25 hp, 460 V, three-phase squirrel-cage motor is protected by an inverse-time breaker. What is the maximum standard breaker size at 250%?
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52 calculators. Two code editions. One answer you can defend.
Load calcs, conductors and conduit, grounding and bonding, motors and transformers, solar and storage — every result printed with dual citations.
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On the truck
Electrical & Electrician App
The calculators, tables and conversions you reach for between pulls. Speak the inputs, get the answer with its citation, and keep working with no signal.
- /Wire size, voltage drop, conduit fill, box fill
- /NEC tables and NEMA configuration lookups
- /Voice entry, fully offline, no ads
For the licensing exam
VoltageLab: NEC Exam Prep
Journeyman, master and contractor practice on the 2026 and 2023 editions, with the article printed on every answer.
- /Thousands of questions, timed or by article
- /Explanations that cite the code, not just the key
- /See which articles keep costing you marks
For apprentices
Electrician Apprentice Hours
Log OJT hours in seconds, watch the journeyman total climb, and hand your board a record you can defend — with six NEC calculators built in.
- /Presets or start–end entry, tagged by category
- /Employers and supervising licences on file
- /Exportable history, works fully offline
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