Electrical Toolkit App, BS 7671 Cable Sizing, Zs and EICR Test Results (Digital Download)

A pocket toolkit for electricians, designers and commissioning engineers. Size cables, check Zs and voltage drop, record test results, run your inspection checklist and log observations on site, then produce a professional PDF report in one tap. Based on BS 7671:2018+A4:2026.

This is a web app that works on your phone, tablet or laptop. After you buy, you download a PDF with your link and a QR code. Opens straight away on your phone, tablet or computer, and you can save it to your Home Screen like any app. No account and no subscription. The first time you open it, type your Etsy order number to unlock it. One order works on up to 3 of your own devices.

WHAT'S INCLUDED
• Projects: keep each job separate, with supply details entered once (earthing arrangement, Ze, fault current, public or private supply)
• Circuit design: drop-downs for device, rating, cable type, installation method, sizes, ambient temperature, grouping and insulation. Works out Ca, Cg, Ci, Cc, the cable rating needed, Ib ≤ In ≤ Iz, voltage drop in volts and percent, R1+R2, design Zs and maximum Zs, with a plain-English reason when something fails
• Suggest cable: finds the smallest cable size that passes every check
• Cable types: 6242Y twin and earth, SWA 2-core and 3/4-core (70°C and 90°C), singles in conduit or trunking (single and three-phase)
• Protective devices: Type B, C and D MCBs, RCBOs, BS 88-2, BS 88-3/BS 1361, BS 3036 and BS 1362 fuses, at 0.4 s and 5 s
• Schedule of test results: ring continuity, R1+R2, insulation resistance, polarity, Zs (checked at 80% of the maximum), RCD times, test buttons, with pass or fail on each
• Inspection checklist: supply, distribution boards, wiring systems, accessories and special locations
• Condition survey: observations coded C1, C2, C3 or FI, with photos from your phone, open items and overall condition
• Reports: one-tap PDF report, CSV export and print
• Backup and restore: move your projects between devices

GOOD TO KNOW
• Reference values are based on BS 7671:2018+A4:2026 (© IET/BSI). You can view and edit every value in the app; always check against your own copy
• Not included: buried cables, aluminium conductors, armour as the protective conductor and adiabatic checks
• This toolkit is an aid for competent persons. It does not replace the regulations, manufacturers' data or your own judgement
• Your data stays on your own device. Nothing is uploaded

For use by the purchaser. Please don't share or resell the link.

From Home at Hand.