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Max Zs Values app for iPhone and iPad

4.8 ( 8528 ratings )
Reference Productivity
Developer: Pro Certs Software Ltd
1.99 USD
Current version: 2.1, last update: 6 months ago
First release : 12 Feb 2012
App size: 10.03 Mb

Calculate maximum permitted Zs values (earth loop impedance) as per BS7671, also includes temperature adjusted values.

Using the picker wheel select the protective device (fuses, MCBs, RCBOs) and device rating to calculate the maximum permitted Zs value for your selected device.

+ BS7671 Amendment 3 2015 values
+ BS EN devices
+ Fuses
+ MCBs
+ RCDs
+ Ze + R1+R2 = Zs
+ 100% values
+ 80% values
+ 0.4 second disconnection times
+ 0.2 second disconnection times
+ 5 second disconnection times

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