Electrician Apprentice Hours vs DC Electrical Calc

Every hour you work counts toward your license — if you can prove it. Electrician Apprentice Hours is a jobsite hour log and NEC calculator built for US electrician apprentices working toward journeyman. Log the day in seconds, keep a record your licensing board can actually read, and run the everyday calculations without leaving the app. Completely free. No subscription, no in-app purchases, no ads. LOG YOUR OJT HOURS IN SECONDS • Tap the hours, pick a category, save — a full day takes about five seconds • Enter total hours or start–end times • Tag every entry with employer, work category and an optional note • Logging and calculators work fully offline, anywhere on the jobsite SEE HOW CLOSE YOU ARE • Live progress toward your hour goal — 8,000 by default, or set your own • Hours remaining and hours logged this week, at a glance • Totals broken out by work category and by employer A RECORD YOUR BOARD CAN READ • The 8 standard OJT work categories — rename, recolor, reorder or add your own • Store each employer with supervisor name and license number • Export a certification-ready PDF or CSV • Combined records split hours by employer, so each supervisor certifies only the work they actually supervised 7 NEC CALCULATORS FOR THE FIELD • Wire size / ampacity — AWG by load and temperature • Voltage drop — volts and % over distance • Max circuit distance — longest run within a drop limit • Load calculator — service size by NEC Article 220 • Motor calculator — circuit sizing by NEC Article 430 • Conduit fill — NEC Chapter 9 fill percentage • Box fill — conductors per box Every result shows the inputs it used and the code articles behind it, so you can check the work instead of trusting a black box. TALK INSTEAD OF TYPING Say "240 volts, 6 gauge wire, 30 amps, 100 foot run" and the calculator fills itself in. Useful when you're gloved up on a ladder and typing isn't happening. BUILT AROUND YOUR APPRENTICESHIP • Set your program or local, your state and your apprentice level • Daily reminder so you never lose a day you already worked • Light and dark mode • Optional sign-in to back up and restore your hours across devices FREE, AND ACTUALLY FREE Every feature is included at no cost — hour logging, all 7 calculators, and full PDF and CSV export. There is no subscription, no in-app purchase, no paid tier and no ads. Nothing is locked behind a trial. You can log hours without an account. Sign-in and cloud backup are optional; skip them and your hours stay on your device. WHO IT'S FOR Electrician apprentices, electrical trainees, union and non-union apprentices, and anyone documenting on-the-job training hours toward a journeyman or electrical license in the United States. TERMS AND PRIVACY We don't sell your data and we don't show you ads. Creating an account is optional, and cloud backup only runs if you turn it on. Full details: Terms of Use: https://voltagelab.com/apprentice-hours/terms Privacy Policy: https://voltagelab.com/apprentice-hours/privacy Support: support@voltagelab.com Calculator results are a field reference, not a substitute for engineering judgment. Always verify against your local amendments, the code edition your jurisdiction has adopted, and actual field conditions. NEC® and National Electrical Code® are registered trademarks of the National Fire Protection Association. This app is not affiliated with, endorsed by, or sponsored by the NFPA.

Wire sizing, voltage drop and ampacity for 12 V, 24 V and 48 V DC systems — offline, on site. Choosing a conductor means satisfying three rules at the same time: voltage drop, ampacity, and the small-conductor overcurrent limits in NEC 240.4(D). Most calculators check one of them and stop. Enter the current, the one-way distance and the system voltage. DC Electrical Calc returns the smallest conductor that satisfies all three at once, then tells you in one sentence which rule is actually limiting the answer: "Limited by voltage drop — not by ampacity. A smaller conductor would carry this current, but its drop would exceed the limit you set." When no size satisfies the constraints it says so, instead of returning the nearest one. Where the underlying table has no published value — 18 AWG and 16 AWG copper at 75 °C, for example — those sizes are treated as failing rather than guessed at. EIGHT TOOLS • Wire Sizing — the smallest conductor that passes drop, ampacity and 240.4(D) together • Voltage Drop — forward calculation for a size you already have • Fuse & Breaker — protective device rating, checked against the conductor • Ohm’s Law & Power — fill in any two of volts, amps and ohms • Battery Bank — series and parallel cells into one bank: voltage, capacity and energy • Inverter Sizing — continuous and surge watts to compare against a nameplate • Runtime — how long the bank lasts at a given load • Ampacity Tables — NEC 310.16 copper and aluminium at 60 °C, 75 °C and 90 °C, plus conductor areas and circular mils EVERY ANSWER SHOWS ITS WORK Tap "Show working" on any result and the formula appears with the values already substituted, so the answer can be checked by hand or handed to an inspector. Nothing is a black box. BUILT FOR THE PLACES YOU WORK • Free, with no in-app purchases, no subscription and no ads • No account and no sign-in • No network connection needed — it works in airplane mode • Metric and AWG in the same view; change units without re-entering anything • Light and dark themes WHAT IT DOES NOT DO It does not size AC circuits, it does not do load calculations for a whole installation, and it is not a substitute for the code book. SAFETY On first launch the app asks you to read a safety notice before it will let you continue. This is a calculation aid. Follow the electrical code that applies where you are installing — NEC for land installations, ABYC E-11 or the equivalent for marine work — and have the work verified by a licensed electrician or surveyor. The app does not constitute engineering advice, and responsibility for a selection rests with the person who makes it.