Non-inductively bundling and IEC 61000-4-5

[Gusbert]

There are a few ways of making a non-inductive bundle of long wire (fold in half, coil up; coil up, twist into figure-of-eight, flatten without folding) as required by IEC 61000-4-5. My question is why? I have done several days testing using 20m of coiled wire which I was told was "non-inductively bundled" but which turned out was not, as it had been coiled, twisted into a figure-of-eight, and the two lobes folded onto each other to make a smaller single coil again. Does using an inductively bundled wire like this invalidate the tests? I should have realised something was wrong when the wired jumped at 4kV/880A pulses.