The all in one electrical app packed full of printable electrical charts, electrical calculators and handy tools & guides.

A useful tool for the electrical installer, maintenance engineer, electrician or testing & inspecting engineer.

+ Watts amps volts calculator
> Single phase convert to or from Watts, Volts & Amps
> Three phase convert to or from kW, volts, amps &
power factor

+ kVA calculator
> Single phase convert to or from kVA, volts, & amps
> Three phase convert to or from kVA, volts, & amps
> kVA-PF-kW calculate to or from kVA, power factor &

+ Zs Values (18th Edition 2018):
> common BS EN devices
> some 60947-2 MCCB manufacture Zs value charts
> RCD's in TT earthing systems max Zs values
> Max REC Ze values
> Uo 55v (110V) single & three phase 63.5v Zs values
> Calculate to or from Ze + R1+R2 = Zs

+ Ring final circuits r1+r2 to R1+R2 converter
+ PFC fault current calculator
+ Cable size calculator
+ Volt drop calculator

+ Earthing & Bonding:
> Main earthing & bonding size calculator
> Circuit cpc (earth) size calculator
> Adiabatic Equation

+ Line conductor to cpc ratio calculator
> Calculates the expected ring circuit r2+r2 from the
r1+r1 value

Printable PDF charts.
+ Bathrooms
> Bathroom zones
> IP ratings of equipment in bathrooms

+ Cable rating charts
+ Cable resistance per meter chart
+ CPC ratio chart for ring final circuits
+ EICR frequency of inspections
+ EICR example observation codes
+ IP codes and the level of protection offered for each
code chart

+ RCD maximum trip times chart
> BS EN 61008-1 & 61009.-1
> BS 4293 & 7288

+SPD surge protection chart
> SPD types and their applications

+ SWA steel armour copper equivalent size chart
+ SWA cleat selection chart
+ SWA gland selection chart
+ Safe wiring zones
+ Types of wiring (wiring codes for electrical
+ Cable installation method codes (for electrical

Frequently updated.

Check out our suite of electrical apps in the app store or at

What’s New

Version 10.41

Thank you for using Electrical Tools & Reference. This update brings new UI improvements and bug fixes. Your feedback is important to us, please email any improvement ideas to or visit

Ratings and Reviews

3.8 out of 5
11 Ratings

11 Ratings

sparky hero ,

Good app

Good app worth getting still a few bugs with the single cable calculator but much better than it was much better than its competitors

Developer Response ,

Thank you for your feedback. We have fixed the bugs you report above in our new version 10.4 released on 2nd Jan 2019. We have also added a print feature to the electrical charts. Feel free to email us at for any further improvement suggestions.

Ry4nl4t ,

Great app

Very good app, handy onsite.
Would be good to be able to zoom in on the pictures.
Also the cpc calculator from the line conductor has a mistake at 120mm it gives cpc of 6mm!

Developer Response ,

Thank you for your feedback. Our latest version 10.4 has fixed the CPC error, we have also added new features and made many improvements. We have changed the electrical chart pictures to PDF files for easy zoom, you can also now print the new electrical charts.
Feel free to email us at with any improvement ideas.

Lorioghtm ,

Very useful

It requires a few polishes, great potential here , it desperately needs an update but It does the job great for what I need it for:
MAX Zs values, and quick Reference to charts. Thanks developer.

Developer Response ,

Thank you for your feedback, hopefully our new V.10.4 2019 update has made many improvements to the app. Feel free to contact us at to submit any further improvement suggestions.


Pro Certs Software Ltd
11.1 MB

Requires iOS 9.0 or later. Compatible with iPhone, iPad and iPod touch.



Age Rating
Rated 4+
© Pro Certs Software Ltd


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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