# The Sparkys Mate

> Fast Zs, cable sizing & circuit design tools for UK electricians (BS 7671)

Canonical page: [https://chrome-stats.com/d/com.bs7671.fieldtoolkit](https://chrome-stats.com/d/com.bs7671.fieldtoolkit)

## Overview

- **ID:** `com.bs7671.fieldtoolkit`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** Circuit Smart
- **Category:** TOOLS
- **Downloads:** 74
- **Version:** 1.0.17
- **Last updated:** 2026-08-07
- **First published:** 2026-06-19
- **Publisher country:** GB
- **Size:** 12 MB
- **Data as of:** 2026-09-13
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.bs7671.fieldtoolkit)
- **Privacy policy:** [https://app.termly.io/policy-viewer/policy.html?policyUUID=6b10edd9-015b-429b-88bc-e8e2c415ed7d](https://app.termly.io/policy-viewer/policy.html?policyUUID=6b10edd9-015b-429b-88bc-e8e2c415ed7d)

## Description

⚡ BS7671 Electrical Toolkit – Built for UK Electricians<br><br>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.<br><br>Built using the principles of BS 7671 (IET Wiring Regulations), the toolkit is designed to be simple, fast, and practical for everyday use.<br><br>🔧 Key Features<br><br>• Zs Calculator<br>Quickly calculate earth fault loop impedance and confirm compliance with disconnection requirements.<br><br>• Cable Sizing<br>Select the correct cable size based on load, length, and installation method.<br><br>• Voltage Drop Calculator<br>Instantly check voltage drop and ensure circuits stay within permitted limits.<br><br>• Smart Circuit Designer<br>Enter a few details and get a full circuit recommendation including cable size, protective device, Zs, and voltage drop.<br><br>• Clear Pass/Fail Results<br>Simple outputs with compliance status so you can make decisions quickly on site.<br><br>⚡ Designed for the Real World<br><br>• Fast inputs and minimal steps<br>• Easy-to-read results<br>• Built for use on site or in the office<br>• No need to carry tables or flick through regulations<br><br>📘 Built Around BS 7671<br><br>All calculations are based on standard UK practices and wiring regulations to support safe and compliant installations.<br><br>⚠️ Disclaimer<br>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.<br><br>---<br><br>Whether you&#39;re an experienced electrician, electrical designer, or apprentice, this app helps simplify everyday calculations and improve efficiency on the job.<br><br>Download now and speed up your workflow ⚡

## Rankings

- #2,095,968 — Overall

## Permissions and access

### Permissions

- `android.permission.ACCESS_NETWORK_STATE`
- `android.permission.INTERNET`
- `android.permission.VIBRATE`
- `com.android.vending.BILLING`
- `com.android.vending.CHECK_LICENSE`
- `com.bs7671.fieldtoolkit.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION`
- `com.google.android.providers.gsf.permission.READ_GSERVICES`

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Source: [Chrome-Stats](https://chrome-stats.com/d/com.bs7671.fieldtoolkit)