BS7671 Field Toolkit

Circuit Smart

In-app purchases

About this app

⚡ BS7671 Electrical Toolkit – Built for UK Electricians

Save time on site with fast, reliable electrical calculations designed around real-world installation work. This app helps UK electricians and electrical designers quickly check circuits, verify compliance, and reduce time spent using tables, spreadsheets, or manuals.

Built using the principles of BS 7671 (IET Wiring Regulations), the toolkit is designed to be simple, fast, and practical for everyday use.

🔧 Key Features

• Zs Calculator
Quickly calculate earth fault loop impedance and confirm compliance with disconnection requirements.

• Cable Sizing
Select the correct cable size based on load, length, and installation method.

• Voltage Drop Calculator
Instantly check voltage drop and ensure circuits stay within permitted limits.

• Smart Circuit Designer
Enter a few details and get a full circuit recommendation including cable size, protective device, Zs, and voltage drop.

• Clear Pass/Fail Results
Simple outputs with compliance status so you can make decisions quickly on site.

⚡ Designed for the Real World

• Fast inputs and minimal steps
• Easy-to-read results
• Built for use on site or in the office
• No need to carry tables or flick through regulations

📘 Built Around BS 7671

All calculations are based on standard UK practices and wiring regulations to support safe and compliant installations.

⚠️ Disclaimer
This app is a guidance tool only. Always verify calculations and refer to the latest edition of BS 7671 when designing or inspecting electrical installations.

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Whether you're an experienced electrician, electrical designer, or apprentice, this app helps simplify everyday calculations and improve efficiency on the job.

Download now and speed up your workflow ⚡

What’s new

Key fixes include responsive phone/tablet layouts, accessible landscape previews, contained PRO badges, improved home/Cable Finder spacing, calculator scroll reset, wrapped summary fields, automatic history saving with feedback, correct Terms/Privacy pages, friendly authentication errors, and reauthenticated account deletion. Verified phone, tablet, and landscape layouts without horizontal overflow.