# Adiabatic Equation Calculator — Adiabatic Equation Formula

> Calculates minimum circuit protective conductor and earth conductor sizes. (iPhone/iPad app by Pro Certs Software Ltd.)

- Source: https://appshunter.io/ios/app/adiabatic-equation-calculator/id1511222749 (this page in markdown: same URL + `.md`)
- Developer: [Pro Certs Software Ltd](https://appshunter.io/developer/444429696)
- Category: Productivity, Reference
- Price: $7.99
- Age rating: 4+
- Requires: iOS 13.0 · 2 MB
- Languages: American English
- Released: 2020-05-05
- Data updated: 2026-09-02
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/adiabatic-equation-calculator/id1511222749/reviews.md

## What is Adiabatic Equation Calculator?

Adiabatic Equation for calculating the minimum cpc (circuit protective conductor) and earth minimum csa sizes of earthing conductors, S = √(I²t) / k.

This Adiabatic Equation Calculator takes into account the following parameters:
t = Disconnection time (seconds).
k = Conductor k value (From BS 7671 tables).
la = Fault current (PEFC in Amps).
I² = la x la.
Results with the minimum CSA mm².

Values of K are obtained from the tables within BS 7671:
- Table 54.2 : Conductor not incorporated in a cable and not bunched with cables.
- Table 54.3 : Conductor incorporated in a cable or bunched with cables.
- Table 54.4 : Sheath or armour of a cable.
- Table 54.5 : Steel conduit or trunking.

Disconnection times (t) are obtained from the maximum operating time/current characteristics tables within BS 7671:
- Fig 3A2 (a,b) : BS 3036 semi-enclosed fuse.
- Fig 3A3 : (a,b) : BS 88-2.2.
- Fig 3A4 : BS EN 60898 / 61009-1 MCB/RCBO type B.
- Fig 3A5 : BS EN 60898 / 61009-1 MCB/RCBO type C.
- Fig 3A6 : BS EN 60898 / 61009-1 MCB/RCBO type D.
- BS 1361 Fuse.

How to use the Adiabatic Equation App:
1) Input your voltage value.
2) Input your Zs value.
3) Select protective device.
4) Select protective device rating.
5) Select conductor type.
6) Select conductor material.
7) Tap calculate.

## Key features

- Calculate minimum CPC and earth conductor sizes
- Uses adiabatic equation formula
- Input voltage and Zs value
- Select protective device and rating
- Select conductor type and material
- Provides results in mm²

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/adiabatic-equation-calculator/id1511222749/reviews.md

### 5/5 — Awesome app

*2020-06-03, version 1.0*

Awesome app so easy to use with correct results.

### 5/5 — Very useful

*2020-05-28, version 1.0*

All your applications are very useful, quick to operate. 
Thanks

## Frequently asked questions about Adiabatic Equation Calculator

### What is the Adiabatic Equation Calculator used for?

The Adiabatic Equation Calculator is used to determine the minimum size of circuit protective conductors (CPC) and earth conductors based on the adiabatic equation formula (S = √(I²t) / k). It helps ensure electrical safety by calculating appropriate conductor sizes for earthing systems.

### What information do I need to use the Adiabatic Equation Calculator?

To use the Adiabatic Equation Calculator, you will need to input your voltage value, Zs value, select the protective device used, its rating, the conductor type, and its material. The app then uses these inputs to calculate the minimum CSA in mm².

### Where does the Adiabatic Equation Calculator get its K values and disconnection times?

The app references values of K from BS 7671 tables, including those for conductors not incorporated in a cable, within a cable, sheaths or armour, and steel conduit or trunking. Disconnection times (t) are derived from tables for various protective devices like fuses and MCBs/RCBOs.

### What devices and conductor types are supported by the Adiabatic Equation Calculator?

The app supports calculations for various protective devices including BS 3036 semi-enclosed fuses, BS 88-2.2, BS EN 60898 / 61009-1 MCB/RCBO types B, C, and D, and BS 1361 fuses. It also allows selection of different conductor types and materials.

### Is the Adiabatic Equation Calculator available on multiple platforms?

Yes, the Adiabatic Equation Calculator is available for iOS devices, specifically for iPhone, iPad, and iPod. It is designed to run on these Apple platforms.

### How often is the Adiabatic Equation Calculator updated?

The Adiabatic Equation Calculator was last updated on August 2, 2025, with version 2.1.5. This indicates that the app receives regular updates to maintain compatibility and potentially add new features or improvements.

### What is the price of the Adiabatic Equation Calculator?

The Adiabatic Equation Calculator is a paid application and costs $7.99. This one-time purchase grants access to all its features for calculating conductor sizes.

### Does the Adiabatic Equation Calculator have ads?

No, the Adiabatic Equation Calculator does not contain advertisements. As a paid application, it provides an ad-free experience for users.

## Version history (last 4 releases)

### 2.1.5 — 2025-08-02

30/07/2025 v2.1.5
- App optimisations.
- UI improvements.

### 1.1.1 — 2022-01-25

Some optimisations and news feed update.

### 1.1 — 2021-12-07

Improved layout, reduced app download size & some optimizations.

### 1.0 — 2020-05-05

No release notes.

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All apps by Pro Certs Software Ltd: https://appshunter.io/developer/444429696

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-02.*