How to Carry Out Earth Fault Loop Impedance Test - Measuring Zs | PTT
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Zs testing is a live earth fault loop impedance test. It measures the total opposition to fault current around the entire loop — line conductor, CPC, connections, the supply transformer, distributor’s earth path and any reactance present in the circuit. It confirms that, under fault conditions, enough current will flow to achieve automatic disconnection within the required time. What it does not do is prove the integrity of each conductor, joint or ring configuration. It tells you the loop works
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