Adiabatic Equation Calculator
Adiabatic Equation Formula
$7.99 · Designed for iPad
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.
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30/07/2025 v2.1.5
- App optimisations.
- UI improvements.
The developer, Pro Certs Software Ltd, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
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Information
- Seller
- Pro Certs Software Ltd
- Size
- 1.9 MB
- Category
- Productivity
- Compatibility
Requires iOS 13.0 or later.
- iPhone
Requires iOS 13.0 or later. - iPad
Requires iPadOS 13.0 or later. - iPod touch
Requires iOS 13.0 or later. - Mac
Requires macOS 11.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2011-2025 Pro Certs Software Ltd
