# Adiabatic Equation Calculator

> Adiabatic Equation Formula

Canonical page: [https://chrome-stats.com/d/id1511222749](https://chrome-stats.com/d/id1511222749)

## Overview

- **ID:** `id1511222749`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Pro Certs Software Ltd
- **Category:** Productivity
- **Version:** 2.1.5
- **Last updated:** 2025-08-02
- **First published:** 2020-05-05
- **Size:** 1.78 MB
- **Data as of:** 2026-09-25
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/adiabatic-equation-calculator/id1511222749)
- **Website:** [https://www.procertssoftware.com](https://www.procertssoftware.com/)
- **Privacy policy:** [https://www.procertssoftware.com/privacy-policy](https://www.procertssoftware.com/privacy-policy)

## Description

The Adiabatic Equation calculator for calculating the minimum earthing and circuit protective conductor earth csa sizes in mm².

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.

## Rankings

- #1,944,013 — Overall

## Similar extensions and apps

- [Cable Calc](https://chrome-stats.com/d/id1044306956)
- [Grounding Size Calc NEC](https://chrome-stats.com/d/id6763312724)
- [Substation Short Circuit](https://chrome-stats.com/d/id6749871804) — 5.00 / 5
- [Max Zs Values](https://chrome-stats.com/d/id498838137)
- [Prysmian Group Voltage Drop](https://chrome-stats.com/d/id847894136) — 5.00 / 5
- [Concentric Neutral Calculator](https://chrome-stats.com/d/id6478878772)
- [Medium Voltage Calculations](https://chrome-stats.com/d/id1559657607)
- [Wire Gauge & Size Calculator](https://chrome-stats.com/d/id6743387075) — 4.90 / 5
- [Electrical Calculator ElecCalc](https://chrome-stats.com/d/id6758902534)
- [Cathodic Protection Calculator](https://chrome-stats.com/d/id6498471281) — 5.00 / 5
- [Fault Current Calculator](https://chrome-stats.com/d/id647477910) — 3.00 / 5
- [Wire Size Calc](https://chrome-stats.com/d/id6763313160)

---

Source: [Chrome-Stats](https://chrome-stats.com/d/id1511222749)