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Old 12-08-2014, 09:36 PM   #21
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I know that this is an old thread but after searching, this is the exact topic that I searched for. One less duplicate for the same subject.

Two graphs below from a AEMC 1060 at 250V between L-N conductors for ten minutes which gives both DAR/PI results. The first is some of that old grey Romex installed in 1956 which read rather low but no problems at all with it. DAR/PI tests are 1.0/1.0

The second graph with the same setup, etc. Newer Romex non-grey and twenty years younger. Much higher reading which you'd think is in better shape but DAR/PI tests are .983/.884.

I read a bunch of threads mentioning a Fluke 1507 which I have also. It just errors out on "most" DAR/PI tests for me. IIRC, it an out of range error because it doesn't have the needed max range for these tests. I tried it on the second setup and it errored out as I pretty much expected.

DAR / PI values for building wiring.-outside-rear.jpg
DAR / PI values for building wiring.-lathe.jpg
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Old 12-08-2014, 10:37 PM   #22
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Interesting. Never done a PI on old low voltage cabling. MV cabling maintenance pretty much just dictates a values of 1.0 or better and that's honestly what I would expect to see for LV cabling as well.

Not sure what to make of the poor PI on the newer Romex. For one thing, I would absolutely wallop it at 1kV and see how it holds up. There's no reason that shouldn't be an acceptable test voltage on modern 600V rated wiring, and if it really is failing, that would demonstrate it clearly.

Though I agree on significantly aged cable like cloth Romex or BX, you're inviting problems by exceeding 250V.
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Old 12-09-2014, 03:27 PM   #23
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At 1000V it showed a lower resistance but the DAR/PI increased slightly to .997/.949

DAR / PI values for building wiring.-lathe-1.jpg
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Old 12-10-2014, 09:45 AM   #24
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Since a wire is mostly a resistive load I don't see what value DAR/PI tests would be, it is not an ANSI/NETA/IEEE test for LV cables.
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Old 12-10-2014, 10:16 AM   #25
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Since a wire is mostly a resistive load I don't see what value DAR/PI tests would be, it is not an ANSI/NETA/IEEE test for LV cables.
From what I've read the PI test if not the DAR test as well is supposed to be defined in IEEE 62-1978 which was superseded by IEEE 62-1995 neither of which I have.
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Old 12-10-2014, 10:56 AM   #26
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The IEEE definitions just describe the nature of the results, they don't dictate what the tests are specific to.

I would have to play with some Romex myself, but at first glance it appears to me that sample you tested is degraded. I don't know of any other explanation for a PI of less than 1.
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