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Content rating
Everyone
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About this app

Max Zs values for Android devices, look up the maximum permitted Zs values ( earth loop impedance ) as per BS 7671 18th edition. Max Zs values include 100% (BS 7671) and 80% (On site guide) temperature adjusted values.

Select from the list of protective devices (fuse's, MCB's, RCBO's) and device ratings to calculate the maximum permitted Zs value for your selected protective device.

Also look up some manufacture BS EN 60947-2 Zs value PDF charts and tables, all printable from within the Max Zs values app.

This Maximum Zs Values app contains Zs tables, charts and calculators all relating to the maximum permitted Zs values of BS 7671.

Max Zs Values Features:
+ BS 7671 18th edition Zs values
+ Common BS EN MCB's, RCBO's and fuses maximum Zs calculator
+ BS EN 60947-2 MCCB manufacture device charts / tables (some)
+ RCD max Zs for TT earthing systems calculator
+ REC max Ze (by enquiry) values
+ Uo 55v and 63.5v Zs values (110v single & three phase) calculator
+ Ze + R1+R2 = Zs calculator
+ Zs - Ze = R1+R2 calculator
+ TN & TT maximum disconnection times chart


A great electrical app to have at hand when you most need it for checking or calculating the maximum permitted Zs ( earth loop Impedance) values.

Max Zs Values is designed for Android tablets and phones. Don't forget to check out our other great collection of electrical apps for Android.

Our other electrical apps include "Pro Certs" (Electrical testing & certification app), "Cable Calc" (Cable size calculator) and many more visit https://www.procertssoftware.com/apps for more info.
Updated on
Aug 25, 2022

Data safety

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No data collected
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What's new

Some UI tweaks and optimisations.