Maximum Zs Values Calculates maximum permitted Zs values to BS 7671 17th edition 2008 (2011) Amd.1 for BS EN devices, MCB’s, RCBO’s, Fuses and Manufacturer Specific Device values, specific values for RCD’s in TT earthing systems, LV, REC Ze values….100% and temperature adjusted values.Includes:+ BS EN Devices Zs values Calculator+ Manufacturer specific device Zs values+ REC Ze values+ Calculate Zs values from known la ratings+ Max Zs values for RCD’s for TT earthing systems+ 55 Volts single phase Zs values calculator+ 63.5 Volts three phase Zs values calculator+ RCD/RCBO Zs values calculator+ BS fuses Zs values+ 100% values+ Temperature adjusted values+ BS7671 17th edition Zs values+ Zs values for 230vA professional max Zs values and earth fault loop impedance values calculator app for Android. A handy app to have for checking and verifying measured Zs values when completing electrical certificates and testing certificates.Optimised for use on tablets and phones.Feel free to contact us with any suggestions or feedback.http://www.electrician-apps.commailto:[email protected]