[SI-LIST] W-elements

Hi SI experts,
My understanding to W-element is that it is defined only for muilti-line
conductors who have the same reference ground. What if I have two pairs of
differential wires, and there is no common ground for the pairs.
 
My question is 1) is W-element defined for 2 pairs of differentail wires? 2)
If yes, then can someone point  me to any reference material that talks
about this topic or help me to understant how W-element model is defined for
differential wires? 3) If no, then can someone tell me a right approach to
find "similar W-element" model (maybe named differently that I don't know)
for differentail wires?
 
Thanks for your help in advance.
Tim


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