In message <f774ab78cfd33746802745be1a3c2a680194a73...@hicgwsex01.ad.harman.com>, dated Mon, 11 Mar 2013, "Huang, Tim" <[email protected]> writes:

You need do the testing by L-GND and N-GND. I think the request makes sense. The grounding terminal can be viewed a reference ground. Certainly, it could be as common mode.

It positively isn't common-mode if it's applied to L and N separately. It's also not like real life: products normally are not standing on metal plates.
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