Auvi Trade

Auvi Trade puts UK building regulations, trade calculators, and voice-powered answers in your pocket. Built for electricians, plumbers, and gas engineers, it works entirely offline on the job, with no accounts and no data collected. AMENDMENT 4 READY BS 7671:2018+A4:2026 (the "Orange Book") published on 15 April 2026, and the previous edition is withdrawn on 15 October 2026. Auvi Trade includes a plain-English guide to what has changed: battery storage (Chapter 57), ICT functional earthing (Section 545), Power over Ethernet (Section 716), revised medical locations (Section 710), and energy efficiency (Chapter 81). CALCULATORS, FROM FIRST PRINCIPLES Every calculator is derived from physics and engineering, not copied tables: - Cable sizing, with voltage drop and installation method - Voltage drop and maximum run length - Zs (earth fault loop impedance) with pass or fail - Prospective fault current (Ipf) and adiabatic CPC sizing - Maximum demand with diversity - Earth electrode resistance (single and parallel rods) - Pipe sizing, gas pipe sizing, and room-by-room heat loss REFERENCE AND DECISION TOOLS - Searchable Approved Documents (Parts P, G, J, B and L) - Part P "is it notifiable?" decision tree - Bathroom zones with IP ratings - EV charger installation reference - Fault-finding flowcharts (RCD tripping, no power, partial loss) - Fire stopping and fire detection guidance - Covers England and Wales, Scotland, and Northern Ireland ASK OUT LOUD Hands dirty or up a ladder? Ask a question by voice and get a plain-English answer with the regulation reference. Everything runs on your device. PRIVATE BY DESIGN No accounts, no analytics, no cloud. Apple verified: No Data Collected. Works fully offline, even with no signal. Auvi Trade is a companion to BS 7671, not a replacement. It does not reproduce BS 7671 text, tables, or diagrams. Reference content is from the Approved Documents (Crown copyright, Open Government Licence v3.0). Always verify requirements for your installation and consult your local Building Control Body where required. Auvi Trade is a £19.99/year auto-renewing subscription with a 7-day free trial. Payment is charged to your Apple ID at confirmation of purchase, and renews automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel in your App Store account settings. Privacy Policy: https://auvi.uk/trade/privacy/ Terms of Use (EULA): https://auvi.uk/trade/terms/