This estimates what the impedance should be based on the cable properties, before you measure it.
milliohms-per-meter values from standard cable manufacturing specifications at 20∘ C20 raised to the composed with power C Example: A cable with a CPC has a combined baseline resistance of Step 3: Compute Circuit Resistance earth fault loop calculator
Where:
Conductor resistance increases linearly with temperature. Cable data sheet values are typically specified at a baseline ambient temperature of 20∘ C20 raised to the composed with power C This estimates what the impedance should be based
When a fault occurs, the current surges. This surge must be high enough to trip the circuit breaker (MCB) or blow the fuse instantly (usually within 0.4 seconds for standard socket outlets). earth fault loop calculator