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Max ZS

Dave mcn

Sorry maybe a silly question but...

I have the house DB TT install -  Ze at 0.38ohms with a high current 2 lead test.

Sub-board 35 meters away, with it's own earth stake. Zdb with a 3 lead low current test is 20.0 ohms.

All circuits off the sub board are relatively short and the Zs tests are around 20.0 - 21.1 ohms. 

Should the max Zs on the test cert be 1667? As electraform Zs test results are in red as the readings are above max Zs levels for the RCBO's 

TIA

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  • 0

    Either the neutral and earth leads have been mixed up on the three lead test or you have put the green lead on neutral. Three lead tests are less accurate but not by that much. Alternatively, the outhouse is TT and TN something at intake. 

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  • 0

    Either the neutral and earth leads have been mixed up on the three lead test or you have put the green lead on neutral. Three lead tests are less accurate but not by that much. Alternatively, the outhouse is TT and TN something at intake. 

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