Journeyman Electrician License

Yuhsiu Lai

Built for working electricians: every tool you need on a real job site, plus a low-pressure drill engine that keeps the NEC fresh in your head. WHY IT'S DIFFERENT Most electrician apps are a wall of quiz questions. Electrician Prep is built around the math you actually do on the job — sizing a feeder, fitting a conduit, picking a breaker. Every calculation is live, every result cites the NEC article it's based on, and the drill engine adapts to you so 5 minutes a day is enough. 7 LIVE CALCULATORS Voltage Drop — Single- or three-phase. Picks K, phase multiplier, and circular mils automatically. Flags ≤ 3 % / ≤ 5 % targets per NEC 210.19 IN and 215.2 IN. Conduit Fill — Build a mixed-AWG THHN/THWN-2 bundle. Live total area plus the smallest EMT trade size that meets 40 % fill (Chapter 9, Table 1). Box Fill — Count conductors by AWG, device yokes, cable-clamp groups, and the EGC bundle. Outputs cubic inches and matches against the standard box catalog (NEC 314.16). Ampacity — Apply 310.15(B)(1) temperature correction and 310.15(C)(1) bundling adjustment in the right order. See the math broken out step by step. Dwelling Load — Optional method (220.82). First 10 kVA at 100 %, remainder at 40 %, plus HVAC. Live service amperage and recommended next-standard service size. Motor Amps — Table FLC lookup for Tables 430.247–430.250. Branch-conductor sizing at 125 %, OCPD up to 250 % (430.52), overload at 115 / 125 % per 430.32. OCPD Sizing — Continuous-load 125 %, conductor ampacity ceiling, and the 240.4(D) small-conductor lockout enforced together. Catches the most common breaker-sizing mistake. SPACED-REPETITION DRILLS Cards are graded on confidence (Again / Hard / Good / Easy). Misses come back in minutes; solid answers come back in days — right when memory starts to fade. The Today's mix smart deck pulls cards due across every topic so a 5-minute session covers your weakest material first. Mastery shows as a per-topic percentage you can watch climb. FIELD GUIDE Search-first NEC reference. Type "GFCI" or "250.66" or "ampacity" and the matching atomic articles surface immediately. Every entry is short enough to read on a ladder. TODAY TAB Daily NEC tip rotated by date, the day's recommended drill mix, and a featured calculator. Open it once a day to keep your streak alive. PROGRESS DASHBOARD Per-topic mastery bars, current and longest drill streak, total card responses, and a breakdown of which calculators you use most. Reset anytime. DESIGNED FOR REAL CONDITIONS Dark, high-contrast theme readable in bright sunlight and low-light job sites Optimized for iPhone and iPad, portrait and landscape Works fully offline — no account, no sign-in, no internet required All NEC tables and formulas built in NOTES NEC references reflect the 2023 code cycle. Always verify against the edition your jurisdiction has adopted and any state amendments. This app is a working aid, not a substitute for the official Code book or a licensed engineer's stamp.