Developing Electrical Apps Since 2011

Electrical Tools & Reference


Enjoy the benefits of having all the information you need with you all the time

Electrical Apps for iPhone
Download for Android
Apps For Electricians



Electrical Tools and Reference is the only app you'll need, packed full with useful electrical reference tables, charts, calculators and tools that an everyday electrician or engineer may need on a daily basis.

Designed with the end user in mind with easy to navigate sectional menus and a searchable index within the sidebar menu. Print many of the included electrical tables for quick reference or to assist with an ongoing project or task.

How many times have you needed to carry out a quick electrical calculation or look up an electrical table but didn't have the required information with you, or just couldn't find it?

- Now you can be safe in the knowledge that you have the information and tools you need, when you need it!

What's Included



  1. Cable Size Calculator
  2. Earthing and Bonding
    1. Adiabatic Equation
    2. Cpc Size Calculator
    3. Earthing & Bonding Size Calculator
    4. Types of Earthing Systems
  3. kVA Calculator
    1. Single Phase kVA Calculations
    2. Three Phase kVA Calculations
    3. kVA | kW | Power Factor Calculator
  4. Max Zs Values
    1. Common BS EN Devices
    2. 60947-2 MCCB Zs Tables
      1. List of Manufacturers Zs Tables
      2. MCCB Explanation of Settings Symbols
    3. RCD’s in TT Earthing System Zs Values
    4. REC (DNO / DSO) Ze Values
    5. Uo 55v and U 63.5v
    6. Zs – Ze = R1+R2 Calculator
    7. Maximum Disconnection Times
    8. MCCB Explanation of Settings Symbols
  5. PFC Fault Current Calculator
  6. Ring Circuit Line to Cpc Ratio Calculator
  7. Ring Circuit r1 r2 to R1+R2 Converter
  8. Volt Drop Calculator
  9. Watts Amps Volts Calculator
    1. Single Phase WAV Calculations
    2. Three Phase WAV Calculations


  1. Appliance Earth Leakage Currents
  2. Bathroom IP Ratings
  3. Bathroom Zones
  4. Cable Rating Tables
    1. List of Cable Rating Tables
  5. Cable Colour Code Charts
    1. BS5308 Part 1 + 2 Colour Codes
    2. ENATS 09-06 Colour Codes
    3. Harmonised Wiring Colours (old to new)
    4. Telephone Connections Guide
    5. RJ45 Plug Connections Guide
  6. Copper Cable Resistance Per Meter
  7. Earthing System Types
  8. EICR Frequency of Inspections
  9. Installation Reference Methods
  10. IP Rating Codes
  11. Line to CPC Resistance Ratio Table
  12. Minimum Cpc Sizes Table 54.7
  13. Safe Wiring Zones
  14. SPD Surge Protection Devices, Types, Uses & Min Cpc
  15. SWA Armour Copper Equivalent Sizes Table
  16. SWA Cleat Selection Table
  17. SWA Gland Selection Table
  18. Types of Wiring
  19. RCD Trip Times
  20. RCD Types
  21. More Coming Soon!


  1. DB Notices
    1. At Risk Warning Label Danger Notice
    2. DB A4 Sign

App Reviews

Don’t take our word for it – here’s what other app users say:

Electrical Apps 7671

Quick Search Menu


Each section of the app has it’s own navigation menus and sub-menus to enable to user to locate information quickly.


  1. Sidebar Menu (Main Menus + List Items)
  2. Electrical Tools Main Menu and Sub-Menus
  3. Electrical Reference Main Menu and Sub-Menus

Navigation Icons:

  1. Navigate to
  2. Sub-Menu
  3. Electrical Table or Chart
  4. Directly call the local DNO

Sidebar Menu:

To activate the sidebar menu tap the Menu icon from the home screen, the side bar menu will then slide in to view from the left.

To enable the quick access sidebar menu from every screen swipe the menu to the left to hide it, you can then swipe right from any screen to access the sidebar menu.

Main Menus


The two main menus which divide the sections of the app are the Electrical Tools menu and Electrical Reference menu.

Electrical Tools contains all the calculators and tools while Electrical Reference contains the charts and tables.

The Electrical Tools Section Includes:

  • kVA Calculator
  • Max Earth Loop Impedance Calculator
  • Electrical Power Calculators
  • Earthing and Bonding Size Calculator
  • Volt Drop Calculator
  • + Many many more…

The Electrical Reference Section Includes:

  • Appliance Earth Leakage Currents
  • Bathroom IP Ratings
  • Cable Rating Charts
  • SPD Types, Uses and Min Cpc Size
  • + Many many more…
PDF Viewer

Document Viewer


We have built our very own custom document viewer integral to this Electrical Tools and Reference App so there is no requirement for any 3rd party PDF viewer or file handler app.

Document Viewer Icons:

  • Toggle between light or dark mode
  • Print the document

DB Notices


With the amount of stickers and signs required on consumer units and distribution boards a DB can get quite unsightly when it is plastered with a plethora of stickers, so why not combine all the stickers, labels and warning notices in to a single smart A4 sign with your own logo.

A4 DB Notice & Danger Warning Notice Labels

The A4 DB Notice Options Include:

  • RCD Test Notice
  • Mixed Wiring Colours Warning Notice
  • SPD Notice
  • Smoke Alarms Notice
  • No CPC for Lighting Circuits
  • Next EICR Due Notice


  • Add your own company logo
  • Apply your relevant cps logo
  • Digitally sign (sign the screen)
  • Set your default company info in the settings option

What's New



Date: TBC 
- NEW: PFC fault current trip time calculator

Date: March 2022
- Added table 4D2A
- Dark background bug fix

Date: December 2021
- Added Ceeform Plugs (Commando)
- Added Luminaire (Lighting) Symbols
- Added A4 DB (Consumer unit) notice
- Added At Risk Danger Notice warning label
- New search menu function, search the sidebar menu
- More items added to the sidebar menu
- Some minor layout improvements

Date: August 2021
- Added some manufacturers BS 3871 Type 4 MCB devices
to the Max Zs Values calculator

Date: March 2021
- Added a Call the local DNO function
- Added a new news feed
- Some UI tweaks
- Some optimizations

Date: December 2020
- Added: Copper Clad Aluminium Cable Rating Table
- Added: MCCB Explanation of Setting Symbols
- Added: DNO Ze Values & Earthing System Types Diagram
- Edit: Max Zs Values > changed wording from REC to DNO / DSO
- Minor tweaks, improvements and optimizations

Date: June 2020
- Added BS 5308 part 1+2 cable colour code charts
- Added Enats 09-06 cable colour code charts
- Added RJ45 connections
- Added Telephone connections
- Added Harmonised wiring colours chart (old to new)
- Optimization improvements
- Reduced app download size

Date: May 2020
- Added a print function to "My Notes"

Date: May 2020
- Brand new redesign
- Brand new UI
- Added new Sidebar menu
- Added new charts
- Added new tools
- Added new features
- Added new custom built document viewer
- iOS 13 update
- Android update

Date: 2019
- UI improvements
- Bug fixes

Date: 2019
- Added print function to electrical charts
- Improved UI
- Fixed volt drop bug
- Improved cable calculator
- Back-end improvements

Date: 2019
- iOS 12 update

Date: 2018
- BS 7671 18th Edition 2018 update

Date: 2016
- Fixed cable calc bug
- Back-end improvements
- UI improvements

Date: 2015
- BS 7671 17th edition Amd 1 update
- New charts added
- Zs values updated

Date: 2014
- Added new charts
- Bug fixes

Date: 2013
- First release
Electricians App

Tablets and Phones


Electrical Tools and Reference is optimised to work on all screen sizes and resolutions from the iPhone 5 up to large tablets and all Android devices.


  • Regularly maintained
  • Encourage all improvement ideas
  • Searchable menu
  • Dedicated support team
  • Print tables
Electrical Apps for iPhone
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