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Loop Impedance Tests

Northern Spark

I did a loop impedance test today at a garage socket with ATT on and got a measurement of about 250Ω, I did it again without ATT and measured about 2.5Ω. I have noticed small discrepancies before, but never on this scale. I did repeat the tests, and am fairly sure I was reading the display properly! The house is PME, presumable exported to the garage. I didn’t have time to investigate further, and am going back on Monday so can look into it further then. I am wondering what could cause such discrepancies. My meter has fairly new batteries in it.

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    I did a test on a couple of sockets in the garage, plugged and unplugged the tester a few times(as that often cleans contacts a bit), same readings. I didn't have time to do test at CU. My test meter is a Kewtech KT66, but quite new. Interesting thought about fault in meter though. There was a solar PV array on the garage, fed into the garage CU. Not sure if that could affect things. As said back there on Monday to investigate further, with some dead tests. Just never seen such a large discrepancy between ATT & Non ATT loop test. 

  • 0 in reply to Northern Spark

    Do a test at home or in the office to test your tester before you go back. Slight smile

  • 0 in reply to aligarjon

    It is indeed useful to have a known test socket.

    Even better, have a test box.

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