Max Zs Calc
Maximum Zs Calculator for Protective Devices
Overview
Max Zs Calc is an essential tool for electrical testing and inspection professionals. This app instantly calculates the maximum earth fault loop impedance (Zs) values for any protective device, ensuring your installations meet BS 7671 requirements. Perfect for EICR testing, new installations, and periodic inspections.
Key Features
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Comprehensive Device Database - Includes all common MCBs, RCBOs, RCDs, and fuses from major manufacturers with accurate disconnection times.
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Temperature Correction - Automatic correction factors applied based on conductor temperature and installation conditions.
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80% Rule Calculations - Built-in 80% rule calculations for design verification as per BS 7671 requirements.
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Quick Reference Tables - Access to BS 7671 tables for maximum Zs values without manual lookup.
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Test Result Comparison - Compare your measured values against calculated maximums with clear pass/fail indicators.
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Export Functionality - Save and share calculations for test sheets and certification documentation.
App Interface
COMING SOON!
Max Zs Calc - Currently in Development
We're finalizing our comprehensive maximum Zs calculator with an extensive device database, automatic temperature correction, BS 7671 compliance features, and instant pass/fail results. This essential tool for electrical testing professionals will be available soon!
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Need Support?
Get help with Max Zs Calc or request additional device types to be added to our database.
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