MasterElec vs Box Fill Pro

Stop pausing your workflow for manual code lookups. MasterElec is a voice-powered assistant built for electricians that works offline. Access NEC references and professional calculators entirely by voice—no signal required. Voice-First Interface: Ask "What's the ampacity for 3/0 copper?" and get instant answers. 100% Offline: Works in basements, job sites, anywhere—no internet needed. NEC Reference: Grounding, GFCI/AFCI requirements, ampacity tables, and more. Professional Calculators: Voltage Drop, Conduit Fill, Box Fill, and Grounding Sizing. Export Ready: Bookmark sections and export calculations as PDFs. Free users get 5 voice queries/day and basic calculators. Upgrade to Pro for unlimited access. Subscription information Subscription options include weekly and yearly plans and will be charged to your Apple ID account. • Payment will be charged at confirmation of purchase. • Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period. • Renewal will be charged within 24 hours prior to the end of the current period. • You can manage or cancel your subscription in your App Store account settings. • Any unused portion of a free trial period, if offered, will be forfeited upon purchase. Terms of Use: https://www.twoscripts.com/terms-of-use/ Privacy Policy: https://www.twoscripts.com/privacy-policy/ MasterElec is an independent application and is not affiliated with or endorsed by the National Fire Protection Association (NFPA). NEC and National Electrical Code are trademarks of NFPA.

Box Fill Pro calculates electrical box fill per NEC 2023 Article 314.16 — the code section that determines how many wires, devices, and fittings can legally fit in a junction or device box. Works offline. No subscription. One-time purchase. WHAT IT CALCULATES - Line-voltage conductors by AWG gauge (14, 12, 10, 8, 6) - Equipment grounding conductors (all EGCs combined = one allowance, per 314.16(B)(5)) - Internal cable clamps (all clamps = one allowance, per 314.16(B)(2)) - Luminaire studs and hickeys - Strap-mounted devices (switches, receptacles) VERDICTS BACKED BY CODE Compares your fill total against NEC Table 314.16(A) box capacities. Get an instant PASS or FAIL — and a suggested upgrade if you're overfilled. BUILT FOR THE FIELD No ads. No cloud. No account required. Designed for electricians who need the answer in seconds, not after a signup flow. PART OF THE FIELDMETRIC SUITE Also available: Conduit Fill Pro (NEC conduit fill calculations).