Earth Fault Loop Impedance | Calculator

Traditionally, engineers performed these calculations manually using look-up tables for cable resistance ($m\Omega/m$). Modern "Earth Fault Loop Impedance Calculators" are software tools or mobile applications that automate this process.

The total Earth Fault Loop Impedance ($Z_s$) is the sum of the external impedance and the internal installation impedance: earth fault loop impedance calculator

| A | B | |---------------------------|----------------| | | 0.35 | | Line length (m) | 25 | | Line CSA (mm²) | 2.5 | | CPC CSA (mm²) | 1.5 | | R1 (ohms) | =0.0172*B2/B3 | | R2 (ohms) | =0.0172*B2/B4 | | R1+R2 | =B5+B6 | | Zs calculated | =B1+B7 | | MCB rating (A) | 20 | | Type (B/C/D) | B | | Max allowed Zs | Look up from table | | Safe? | =IF(B8<=B10,"Yes","No") | | =IF(B8&lt;=B10,"Yes","No") | While an Earth Fault Loop

While an Earth Fault Loop Impedance Calculator is an essential design and verification tool, it does not replace . Once an installation is complete, a calibrated Earth Loop Impedance Tester must be used to verify that the real-world values match your calculated predictions. Conclusion earth fault loop impedance calculator